# Franklin 6A4150 series

- Type: Engine model (FAA registry)
- Registry code: 27024
- Manufacturer (registry): FRANKLIN
- Model: 6A4150 SERIES
- Engine type: Reciprocating
- Power: 150 hp
- Data sheet: [TCDS E-238](https://openairdocs.org/tcds/E-238) (OpenAirDocs)
- Holder: Franklin Sp. z.o.o.
- Installed in: 623 registered aircraft
- Page: https://openairdocs.org/engine/franklin-6a4150-series

The registry names only the engine series, so ADs for every model in the series are matched.

## ADs that may apply (OpenAirDocs)

Matched to this engine model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment.

- [AD 96-02-04](https://openairdocs.org/ad/96-02-04): 80 Octane Avgas · Wytwornia Sprzetu Komunikacyjnego 6A4-150-B3 and 6A4-165-B3. Effective Feb 13, 1996
- [AD 69-09-01](https://openairdocs.org/ad/69-09-01): Eisemann Magnetos · Eisemann Magnetos, 2A4-45-B2, 2A4-49-B2 and 158 more
- [AD 48-50-01](https://openairdocs.org/ad/48-50-01): Cylinder Base Flange · Wytwornia Sprzetu Komunikacyjnego 6A4-150-B3 and 6A4-150-B31
- [AD 48-21-01](https://openairdocs.org/ad/48-21-01): Accelerator Pump Linkage · Wytwornia Sprzetu Komunikacyjnego 6A4-150-B3 and 6A4-150-B31

## Registered aircraft (623, first 50)

- [N108DF](https://openairdocs.org/aircraft/N108DF): [Murtagh Johnny T](https://openairdocs.org/faa-owner/MURTAGH%20JOHNNY%20T), [Lexington, MS](https://openairdocs.org/faa-place/MS/Lexington), built 1946, S/N 10860
- [N108WW](https://openairdocs.org/aircraft/N108WW): [Bingham Merle G](https://openairdocs.org/faa-owner/BINGHAM%20MERLE%20G), [Hickson, ND](https://openairdocs.org/faa-place/ND/Hickson), built 1946, S/N 108-384
- [N125HK](https://openairdocs.org/aircraft/N125HK): [Carter Steven R](https://openairdocs.org/faa-owner/CARTER%20STEVEN%20R), [Bend, OR](https://openairdocs.org/faa-place/OR/Bend), built 1947, S/N 108-2056
- [N133JM](https://openairdocs.org/aircraft/N133JM): [Maggie L Air Service LLC](https://openairdocs.org/faa-owner/MAGGIE%20L%20AIR%20SERVICE%20LLC), [Kalispell, MT](https://openairdocs.org/faa-place/MT/Kalispell), S/N 108-55
- [N136SP](https://openairdocs.org/aircraft/N136SP): [Sivils Richard Christopher](https://openairdocs.org/faa-owner/SIVILS%20RICHARD%20CHRISTOPHER), [Healy, AK](https://openairdocs.org/faa-place/AK/Healy), built 1946, S/N 108-931
- [N1380C](https://openairdocs.org/aircraft/N1380C): [Beltz Ronald K](https://openairdocs.org/faa-owner/BELTZ%20RONALD%20K), [Delta, OH](https://openairdocs.org/faa-place/OH/Delta), built 1946, S/N 108-645
- [N1413A](https://openairdocs.org/aircraft/N1413A): [King John D](https://openairdocs.org/faa-owner/KING%20JOHN%20D), [Midland, VA](https://openairdocs.org/faa-place/VA/Midland), built 1947, S/N 1532
- [N1413B](https://openairdocs.org/aircraft/N1413B): [Simpson Bradley C](https://openairdocs.org/faa-owner/SIMPSON%20BRADLEY%20C), [Grandview, TX](https://openairdocs.org/faa-place/TX/Grandview), built 1949, S/N 1640
- [N14396](https://openairdocs.org/aircraft/N14396): [Tobias Eric](https://openairdocs.org/faa-owner/TOBIAS%20ERIC), [Milwaukee, WI](https://openairdocs.org/faa-place/WI/Milwaukee), built 1947, S/N 1509
- [N151C](https://openairdocs.org/aircraft/N151C): [Miller Robert P](https://openairdocs.org/faa-owner/MILLER%20ROBERT%20P), [Cedar, MI](https://openairdocs.org/faa-place/MI/Cedar), S/N 108-250
- [N1947S](https://openairdocs.org/aircraft/N1947S): [Southern Aircraft Consultancy Inc Trustee](https://openairdocs.org/faa-owner/SOUTHERN%20AIRCRAFT%20CONSULTANCY%20INC%20TRUSTEE), [Casper, WY](https://openairdocs.org/faa-place/WY/Casper), built 1947, S/N 108-1719
- [N200LG](https://openairdocs.org/aircraft/N200LG): [Carty Stephen](https://openairdocs.org/faa-owner/CARTY%20STEPHEN), [Inman, KS](https://openairdocs.org/faa-place/KS/Inman), built 1946, S/N 108-108
- [N2101Q](https://openairdocs.org/aircraft/N2101Q): [Atkinson Justin S](https://openairdocs.org/faa-owner/ATKINSON%20JUSTIN%20S), [Fairbanks, AK](https://openairdocs.org/faa-place/AK/Fairbanks), built 1946, S/N 108-1182
- [N211C](https://openairdocs.org/aircraft/N211C): [Wells Sherry A Trustee](https://openairdocs.org/faa-owner/WELLS%20SHERRY%20A%20TRUSTEE), [Ferndale, MI](https://openairdocs.org/faa-place/MI/Ferndale), S/N 108-1965
- [N242](https://openairdocs.org/aircraft/N242): [Ohlmer Ted J](https://openairdocs.org/faa-owner/OHLMER%20TED%20J), [Monterey, CA](https://openairdocs.org/faa-place/CA/Monterey), S/N 1425
- [N25192](https://openairdocs.org/aircraft/N25192): [Cullman Daniel H](https://openairdocs.org/faa-owner/CULLMAN%20DANIEL%20H), [Kent, WA](https://openairdocs.org/faa-place/WA/Kent), built 1939, S/N 1013
- [N25195](https://openairdocs.org/aircraft/N25195): [Andraka Andrew](https://openairdocs.org/faa-owner/ANDRAKA%20ANDREW), [Newport News, VA](https://openairdocs.org/faa-place/VA/Newport%20News), built 1940, S/N 1016
- [N2642](https://openairdocs.org/aircraft/N2642): [Edwards Whit](https://openairdocs.org/faa-owner/EDWARDS%20WHIT), [Brookland, AR](https://openairdocs.org/faa-place/AR/Brookland), built 1947, S/N 108-1515
- [N2643](https://openairdocs.org/aircraft/N2643): [Norman Robert A](https://openairdocs.org/faa-owner/NORMAN%20ROBERT%20A), [Zanesville, OH](https://openairdocs.org/faa-place/OH/Zanesville), S/N 108-1516
- [N2649V](https://openairdocs.org/aircraft/N2649V): [Stedingh Donald M](https://openairdocs.org/faa-owner/STEDINGH%20DONALD%20M), [Anchorage, AK](https://openairdocs.org/faa-place/AK/Anchorage), built 1948, S/N 18159
- [N28972](https://openairdocs.org/aircraft/N28972): [Wahrer Terry J](https://openairdocs.org/faa-owner/WAHRER%20TERRY%20J), [Cripple Creek, CO](https://openairdocs.org/faa-place/CO/Cripple%20Creek), built 1941, S/N 1042
- [N28974](https://openairdocs.org/aircraft/N28974): [Friends Of Bellanca Airfield Inc](https://openairdocs.org/faa-owner/FRIENDS%20OF%20BELLANCA%20AIRFIELD%20INC), [New Castle, DE](https://openairdocs.org/faa-place/DE/New%20Castle), built 1941, S/N 1044
- [N28984](https://openairdocs.org/aircraft/N28984): [Cullman Daniel H](https://openairdocs.org/faa-owner/CULLMAN%20DANIEL%20H), [Kent, WA](https://openairdocs.org/faa-place/WA/Kent), built 1941, S/N 1054
- [N303](https://openairdocs.org/aircraft/N303): [Behlings Jennifer E](https://openairdocs.org/faa-owner/BEHLINGS%20JENNIFER%20E), [Custer, SD](https://openairdocs.org/faa-place/SD/Custer), built 1946, S/N 108-536
- [N33GM](https://openairdocs.org/aircraft/N33GM): [Meulenberg Jacobus Mj](https://openairdocs.org/faa-owner/MEULENBERG%20JACOBUS%20MJ), [Schenevus, NY](https://openairdocs.org/faa-place/NY/Schenevus), built 1947, S/N 1542
- [N340C](https://openairdocs.org/aircraft/N340C): [Lindvig Rachel R](https://openairdocs.org/faa-owner/LINDVIG%20RACHEL%20R), [Canton, MI](https://openairdocs.org/faa-place/MI/Canton), built 1947, S/N 108-3340
- [N358C](https://openairdocs.org/aircraft/N358C): [Nicola John T](https://openairdocs.org/faa-owner/NICOLA%20JOHN%20T), [Coffee Springs, AL](https://openairdocs.org/faa-place/AL/Coffee%20Springs), built 1947, S/N 108-3358
- [N35VM](https://openairdocs.org/aircraft/N35VM): [Gatward Alan J](https://openairdocs.org/faa-owner/GATWARD%20ALAN%20J), [Fox Island, WA](https://openairdocs.org/faa-place/WA/Fox%20Island), built 1947, S/N 108-2138
- [N3609](https://openairdocs.org/aircraft/N3609): [Macdonald Randall N](https://openairdocs.org/faa-owner/MACDONALD%20RANDALL%20N), [Weidman, MI](https://openairdocs.org/faa-place/MI/Weidman), built 1970, S/N 1-F
- [N386C](https://openairdocs.org/aircraft/N386C): [Flying M Services Inc](https://openairdocs.org/faa-owner/FLYING%20M%20SERVICES%20INC), [Germansville, PA](https://openairdocs.org/faa-place/PA/Germansville), S/N 108-3386
- [N39462](https://openairdocs.org/aircraft/N39462): [Hunton John C K](https://openairdocs.org/faa-owner/HUNTON%20JOHN%20C%20K), [Bowdoinham, ME](https://openairdocs.org/faa-place/ME/Bowdoinham), S/N 108-18
- [N39470](https://openairdocs.org/aircraft/N39470): [Pike John S](https://openairdocs.org/faa-owner/PIKE%20JOHN%20S), [Richmond, IN](https://openairdocs.org/faa-place/IN/Richmond), built 1946, S/N 108-39
- [N39498](https://openairdocs.org/aircraft/N39498): [Finnegan James M](https://openairdocs.org/faa-owner/FINNEGAN%20JAMES%20M), [West Valley City, UT](https://openairdocs.org/faa-place/UT/West%20Valley%20City), built 1946, S/N 108-29
- [N39CH](https://openairdocs.org/aircraft/N39CH): [Tennair LLC](https://openairdocs.org/faa-owner/TENNAIR%20LLC), [Clarksville, TN](https://openairdocs.org/faa-place/TN/Clarksville), built 1946, S/N 108-127
- [N40106](https://openairdocs.org/aircraft/N40106): [Weatherford Verdia G](https://openairdocs.org/faa-owner/WEATHERFORD%20VERDIA%20G), [White Hall, AR](https://openairdocs.org/faa-place/AR/White%20Hall), built 1946, S/N 108-36
- [N40107](https://openairdocs.org/aircraft/N40107): [Knutson Wayne R](https://openairdocs.org/faa-owner/KNUTSON%20WAYNE%20R), [Thompson, ND](https://openairdocs.org/faa-place/ND/Thompson), built 1946, S/N 108-37
- [N40114](https://openairdocs.org/aircraft/N40114): [Reves Samuel S](https://openairdocs.org/faa-owner/REVES%20SAMUEL%20S), [Holly Springs, MS](https://openairdocs.org/faa-place/MS/Holly%20Springs), S/N 108-44
- [N40123](https://openairdocs.org/aircraft/N40123): [Gerardi Joseph A](https://openairdocs.org/faa-owner/GERARDI%20JOSEPH%20A), [Savannah, GA](https://openairdocs.org/faa-place/GA/Savannah), built 1946, S/N 108-53
- [N40128](https://openairdocs.org/aircraft/N40128): [Weigel Samuel D](https://openairdocs.org/faa-owner/WEIGEL%20SAMUEL%20D), [Bremerton, WA](https://openairdocs.org/faa-place/WA/Bremerton), built 1946, S/N 108-58
- [N40131](https://openairdocs.org/aircraft/N40131): [Browne Travis](https://openairdocs.org/faa-owner/BROWNE%20TRAVIS), [Midland, TX](https://openairdocs.org/faa-place/TX/Midland), S/N 108-61
- [N40140](https://openairdocs.org/aircraft/N40140): [Farwell Jesse R](https://openairdocs.org/faa-owner/FARWELL%20JESSE%20R), [Albion, NY](https://openairdocs.org/faa-place/NY/Albion), S/N 108-70
- [N40143](https://openairdocs.org/aircraft/N40143): [Smith David R](https://openairdocs.org/faa-owner/SMITH%20DAVID%20R), [Tracy, MN](https://openairdocs.org/faa-place/MN/Tracy), S/N 108-73
- [N40147](https://openairdocs.org/aircraft/N40147): [Padin Leonard](https://openairdocs.org/faa-owner/PADIN%20LEONARD), [Las Vegas, NV](https://openairdocs.org/faa-place/NV/Las%20Vegas), S/N 108-77
- [N40148](https://openairdocs.org/aircraft/N40148): [Evenson Kyle D](https://openairdocs.org/faa-owner/EVENSON%20KYLE%20D), [Bothell, WA](https://openairdocs.org/faa-place/WA/Bothell), built 1946, S/N 108-78
- [N40152](https://openairdocs.org/aircraft/N40152): [Fagnano Raymond](https://openairdocs.org/faa-owner/FAGNANO%20RAYMOND), [Columbia, NJ](https://openairdocs.org/faa-place/NJ/Columbia), built 1946, S/N 108-82
- [N40153](https://openairdocs.org/aircraft/N40153): [Hudson Kevin D](https://openairdocs.org/faa-owner/HUDSON%20KEVIN%20D), [Half Moon Bay, CA](https://openairdocs.org/faa-place/CA/Half%20Moon%20Bay), built 1946, S/N 108-83
- [N40157](https://openairdocs.org/aircraft/N40157): [Jones Daniel S](https://openairdocs.org/faa-owner/JONES%20DANIEL%20S), [Panama City Beach, FL](https://openairdocs.org/faa-place/FL/Panama%20City%20Beach), built 1946, S/N 108-87
- [N40159](https://openairdocs.org/aircraft/N40159): [Leyner Robert E](https://openairdocs.org/faa-owner/LEYNER%20ROBERT%20E), [Berthoud, CO](https://openairdocs.org/faa-place/CO/Berthoud), built 1946, S/N 108-89
- [N40164](https://openairdocs.org/aircraft/N40164): [Morrow Mitchell D](https://openairdocs.org/faa-owner/MORROW%20MITCHELL%20D), [Lexington, GA](https://openairdocs.org/faa-place/GA/Lexington), built 1946, S/N 108-94
- [N40168](https://openairdocs.org/aircraft/N40168): [Roy Aero Service](https://openairdocs.org/faa-owner/ROY%20AERO%20SERVICE), [Grand Marais, MN](https://openairdocs.org/faa-place/MN/Grand%20Marais), S/N 108-98

All 623: https://openairdocs.org/engine/franklin-6a4150-series/aircraft.md

## NTSB investigations (421, newest 50)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB WPR26LA313](https://openairdocs.org/ntsb/WPR26LA313), Aug 22, 2026: Stinson 108-1 (N8391K), Joseph, OR, substantial damage, investigation ongoing
- [NTSB CEN25LA243](https://openairdocs.org/ntsb/CEN25LA243), Jul 8, 2025: Stinson 108 (N97577), Seguin, TX, no damage. Probable cause: The pilot’s failure to turn off the magneto switch before repositioning the propeller by hand which resulted in an inadvertent engine start.
- [NTSB ANC25LA052](https://openairdocs.org/ntsb/ANC25LA052), Jun 14, 2025: Stinson 108 (N2101Q), Cantwell, AK, substantial damage, investigation ongoing
- [NTSB CEN25FA194](https://openairdocs.org/ntsb/CEN25FA194), Jun 3, 2025: Universal Stinson 108 (N40158), Farmington, NC, substantial damage, 2 fatal, investigation ongoing
- [NTSB ERA24LA201](https://openairdocs.org/ntsb/ERA24LA201), Apr 25, 2024: Stinson 108 (N97517), Beach City, OH, substantial damage. Probable cause: A total loss of engine power due to the due to the pilot’s delayed application of carburetor heat.
- [NTSB ANC24LA020](https://openairdocs.org/ntsb/ANC24LA020), Mar 15, 2024: Stinson 108 (N9041K), Houston, AK, substantial damage. Probable cause: A total loss of engine power due to fuel starvation and the pilot's mismanagement of the available fuel.
- [NTSB WPR23LA359](https://openairdocs.org/ntsb/WPR23LA359), Sep 27, 2023: Stinson 108-1 (N9128K), San Diego, CA, substantial damage. Probable cause: The pilot’s failure to maintain directional control during landing in gusty wind conditions that resulted in a ground loop.
- [NTSB ANC23LA051](https://openairdocs.org/ntsb/ANC23LA051), Jul 13, 2023: Stinson 108 (N97719), Ninilchik, AK, substantial damage. Probable cause: A partial loss of engine power due to failure of the No. 1 cylinder intake valve head.
- [NTSB WPR23LA271](https://openairdocs.org/ntsb/WPR23LA271), Jul 11, 2023: Stinson 108-1 (N8889K), Burlington, WA, substantial damage. Probable cause: The pilot’s failure to maintain directional control during the landing roll with a quartering tailwind.
- [NTSB WPR23LA109](https://openairdocs.org/ntsb/WPR23LA109), Feb 12, 2023: Stinson 108-1 (N8135K), Morgan, UT, substantial damage. Probable cause: The pilot’s failure to maintain directional control during landing.
- [NTSB ERA22LA353](https://openairdocs.org/ntsb/ERA22LA353), Jul 30, 2022: Stinson 108-1 (N9162K), Columbus, OH, substantial damage. Probable cause: The pilot’s improper landing flare, which resulted in a bounced landing and a collapse of the left main landing gear.
- [NTSB CEN22LA012](https://openairdocs.org/ntsb/CEN22LA012), Oct 8, 2021: Stinson 108 (N677JD), Wildwood, AR, substantial damage. Probable cause: A total loss of engine power for reasons that could not be determined.
- [NTSB ANC21LA068](https://openairdocs.org/ntsb/ANC21LA068), Aug 2, 2021: Stinson 108-1 (N8656K), Sterling, AK, substantial damage. Probable cause: Insufficient available power as a result of low compression in three engine cylinders. Contributing to the accident was the pilot’s decision to takeoff with a slight quartering tailwind.
- [NTSB WPR21LA289](https://openairdocs.org/ntsb/WPR21LA289), Jul 25, 2021: Stinson 108-1 (N8844K), Bozeman, MT, substantial damage. Probable cause: The pilot’s failure to maintain directional control during landing which resulted in a ground loop.
- [NTSB WPR20CA168](https://openairdocs.org/ntsb/WPR20CA168), Jun 4, 2020: Stinson 108 (N87607), Yakima, WA, substantial damage. Probable cause: The pilot's failure to maintain directional control of the airplane during an aborted landing, which resulted in a ground loop, runway excursion, and subsequent nose over.
- [NTSB GAA19CA522](https://openairdocs.org/ntsb/GAA19CA522), Sep 1, 2019: Stinson 108 (N97699), Bandera, WA, substantial damage. Probable cause: The pilot's selection of unsuitable terrain for a simulated rejected takeoff, which resulted in a runway overrun and noseover.
- [NTSB CEN19LA060](https://openairdocs.org/ntsb/CEN19LA060), Jan 19, 2019: Stinson 108 (N97969), Keshena, WI, substantial damage. Probable cause: A total loss of engine power during cruise flight for undetermined reasons, which resulted in a forced landing and subsequent impact with trees.
- [NTSB GAA18CA238](https://openairdocs.org/ntsb/GAA18CA238), Apr 28, 2018: Stinson 108 (N35VM), Spokane, WA, substantial damage. Probable cause: The pilot’s failure to maintain directional control during landing.
- [NTSB GAA18CA165](https://openairdocs.org/ntsb/GAA18CA165), Mar 10, 2018: Bellanca 1413 (N74445), Anacortes, WA, substantial damage. Probable cause: The pilot’s failure to maintain directional control during landing.
- [NTSB CEN17LA280](https://openairdocs.org/ntsb/CEN17LA280), Jul 21, 2017: Stinson 108 (N8954K), Lee's Summit, MO, substantial damage. Probable cause: The pilot’s loss of directional control during landing due to the failure of the right brake seal.
- [NTSB CEN17LA023](https://openairdocs.org/ntsb/CEN17LA023), Oct 18, 2016: Stinson 108 (N97634), Austin, TX, substantial damage. Probable cause: The pilot’s failure to maintain directional control while landing in gusting wind conditions.
- [NTSB ERA17FA001](https://openairdocs.org/ntsb/ERA17FA001), Oct 1, 2016: Culver PQ 14A (N4648V), Hickory, NC, destroyed, 1 fatal. Probable cause: The loss of engine power due to carburetor icing. Contributing to the accident was the pilot's use of automobile gasoline, which increased the likelihood of carburetor icing.
- [NTSB ERA16LA173](https://openairdocs.org/ntsb/ERA16LA173), Apr 30, 2016: Universal Stinson 108 (N8660K), Calverton, NY, substantial damage. Probable cause: The pilot's failure to maintain directional control during the landing roll.
- [NTSB GAA16CA090](https://openairdocs.org/ntsb/GAA16CA090), Dec 19, 2015: Stinson 108 (N97411), Portales, NM, substantial damage. Probable cause: The pilot receiving instruction's improper brake application during the flight instructor's aborted landing, which resulted in a loss of directional control and a runway excursion. Contributing to…
- [NTSB GAA16CA070](https://openairdocs.org/ntsb/GAA16CA070), Dec 2, 2015: Stinson 108 (N97537), Sharon, KS, substantial damage. Probable cause: The pilot's decision to continue the unstabilized approach and landing and his delayed decision to go around with an insufficient climb rate, which resulted with collision with trees.
- [NTSB ERA15LA239](https://openairdocs.org/ntsb/ERA15LA239), Jun 14, 2015: Stinson 108 (N97505), Dushore, PA, substantial damage. Probable cause: The total loss of engine power during the initial climb for reasons that could not be determined because postaccident examination of the engine revealed no anomalies that would have precluded normal…
- [NTSB ERA15LA201](https://openairdocs.org/ntsb/ERA15LA201), Apr 16, 2015: Universal Stinson 108-1 (N9799G), Macon, MS, substantial damage. Probable cause: A partial loss of engine power for reasons that could not be determined based on the available information.
- [NTSB CEN14LA417](https://openairdocs.org/ntsb/CEN14LA417), Jul 18, 2014: Stinson 108 1 (N9034K), Bruno, MN, substantial damage. Probable cause: The total loss of engine power due to an anomaly with the carburetor system that could not be determined during postaccident examination.
- [NTSB WPR14LA079](https://openairdocs.org/ntsb/WPR14LA079), Dec 27, 2013: Stinson 108 1 (N8848K), Lodi, CA, substantial damage. Probable cause: The fatigue failure of the crankshaft, which resulted in a total loss of engine power and subsequent forced landing.
- [NTSB ERA13CA422](https://openairdocs.org/ntsb/ERA13CA422), Sep 19, 2013: Universal Stinson 108 1 (N8384K), Lawrenceville, GA, substantial damage. Probable cause: The pilot's failure to maintain directional control during the landing, resulting in a ground loop, runway excursion, and structural damage to the right wing.
- [NTSB ERA13LA327](https://openairdocs.org/ntsb/ERA13LA327), Jul 17, 2013: Univair 108-1 (N8721K), Tuftonboro, NH, substantial damage. Probable cause: Maintenance personnel’s failure to remove circumferential gouges in the aft radius of the R2 rod journal on the crankshaft during its last engine overhaul, which resulted in the fatigue failure of…
- [NTSB CEN13CA412](https://openairdocs.org/ntsb/CEN13CA412), Jul 14, 2013: Universal Stinson 108-1 (N855F), Hector, MN, substantial damage. Probable cause: The pilot’s inadvertent application of the brakes and failure to main directional control of the airplane during the takeoff roll, which resulted in the airplane nosing over.
- [NTSB ERA13LA269](https://openairdocs.org/ntsb/ERA13LA269), Jun 4, 2013: Stinson 108 (N97592), Elkton, KY, substantial damage. Probable cause: The pilot's failure to use carburetor heat during the approach to landing, which resulted in carburetor icing and a partial loss of engine power during a subsequent initial climb.
- [NTSB CEN13CA317](https://openairdocs.org/ntsb/CEN13CA317), Jun 4, 2013: Stinson 108 (N677JD), Lebanon, IN, substantial damage. Probable cause: The pilot did not maintain control of the airplane during the landing roll.
- [NTSB CEN13CA284](https://openairdocs.org/ntsb/CEN13CA284), May 17, 2013: Stinson 108-1 (N8931K), Cambridge, MN, substantial damage. Probable cause: The pilot’s loss of directional control while landing with a gusting crosswind.
- [NTSB ANC12CA104](https://openairdocs.org/ntsb/ANC12CA104), Sep 9, 2012: Stinson 108-2 (N9723K), Nikiski, AK, substantial damage. Probable cause: The pilot's selection of an unsuitable landing surface, which resulted in a loss of control during the landing roll.
- [NTSB ERA12CA529](https://openairdocs.org/ntsb/ERA12CA529), Aug 23, 2012: Stinson 108-2 (N340C), Winter Haven, FL, substantial damage. Probable cause: The pilot’s failure to maintain directional control during the takeoff, which resulted in a runway excursion.
- [NTSB WPR12CA148](https://openairdocs.org/ntsb/WPR12CA148), Mar 25, 2012: Stinson 108-1 (N97032), Coolin, ID, substantial damage. Probable cause: The pilot’s decision to land on a snow-covered runway.
- [NTSB WPR12LA045](https://openairdocs.org/ntsb/WPR12LA045), Nov 19, 2011: Stinson 108-1 (N9016K), Boulder City, NV, substantial damage. Probable cause: The pilot's failure to maintain directional control while taxiing with a gusting crosswind.
- [NTSB CEN11LA536](https://openairdocs.org/ntsb/CEN11LA536), Aug 1, 2011: Bellanca 14-13 (N74260), Stoughton, WI, substantial damage. Probable cause: The pilot’s improper preflight planning and his failure to gain proper airspeed during takeoff from a grass airstrip resulting in a stall, the loss of control, and subsequent impact with the trees.…
- [NTSB WPR11CA345](https://openairdocs.org/ntsb/WPR11CA345), Jul 23, 2011: Stinson 108-1 (N8318K), Moses Lake, WA, substantial damage. Probable cause: The pilot's failure to maintain directional control during an aborted takeoff.
- [NTSB CEN11FA247](https://openairdocs.org/ntsb/CEN11FA247), Mar 27, 2011: Stinson 108 (N97383), Dickens, TX, substantial damage, 3 fatal. Probable cause: The non-instrument rated pilot's decision to fly in night instrument meteorological conditions.
- [NTSB WPR11CA165](https://openairdocs.org/ntsb/WPR11CA165), Mar 15, 2011: Bellanca 14-13-2 (N74291), Mesquite, NV, substantial damage. Probable cause: The malfunction of the brake system which led to the pilot's failure to maintain directional control during the landing roll.
- [NTSB ERA10LA442](https://openairdocs.org/ntsb/ERA10LA442), Aug 25, 2010: Stinson 108 (N97316), Andrews, SC, substantial damage, 1 fatal. Probable cause: Loss of engine power due to fuel exhaustion, and the student pilot's failure to adequately preflight the airplane prior to takeoff.
- [NTSB ANC10CA051](https://openairdocs.org/ntsb/ANC10CA051), Jun 8, 2010: Stinson 108-1 (N136SP), Galena, AK, substantial damage. Probable cause: The pilot's failure to maintain directional control during takeoff, resulting in a ground-loop, and collapse of the right main landing gear.
- [NTSB ERA10LA111](https://openairdocs.org/ntsb/ERA10LA111), Jan 9, 2010: Stinson 108 (N97223), Bayport, NY, substantial damage. Probable cause: A total loss of engine power during cruise flight due to fuel contamination.
- [NTSB ANC10CA010](https://openairdocs.org/ntsb/ANC10CA010), Dec 18, 2009: Stinson 108-1 (N136SP), Selawik, AK, substantial damage. Probable cause: The pilot's failure to maintain a proper descent rate during landing, resulting in a hard landing.
- [NTSB WPR09LA022](https://openairdocs.org/ntsb/WPR09LA022), Oct 23, 2008: Stinson 108-1 (N97946), Concrete, WA, substantial damage, 1 fatal. Probable cause: The loss of engine power during initial climb due to the pilot's improper exhaust system maintenance, which resulted in restriction of the carburetor's air intake.
- [NTSB LAX07CA152](https://openairdocs.org/ntsb/LAX07CA152), May 5, 2007: Stinson 108 (N97648), Auburn, CA, substantial damage. Probable cause: The pilot's failure to maintain an adequate airspeed during an aborted landing that resulted in a stall/mush.
- [NTSB ATL07CA059](https://openairdocs.org/ntsb/ATL07CA059), Mar 25, 2007: Stinson 108 (N8384K), Lawrenceville, GA, substantial damage. Probable cause: The pilot's failure to maintain directional control on landing roll out resulting in a ground loop.

All 421: https://openairdocs.org/engine/franklin-6a4150-series/ntsb.md

## FAA accident and incident reports (375, newest 50)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20260822012139A](https://openairdocs.org/incident/20260822012139A), Aug 22, 2026: Stinson 108-1 (N8391K), Joseph, OR, Substantial damage. Pilot flew from sandpoint (kszt) to Joseph (kjsy) for a fuel stop. While on final approach noticed the winds were favoring a heavy crosswind and decided to…
- [Accident 20250708009339A](https://openairdocs.org/incident/20250708009339A), Jul 8, 2025: Stinson 108 (N97577), Marion, TX, Minor damage. On July 8, 2025, at approximately 1810 CDT, aircraft [privacy data omitted] was involved in an accident while being prepared for flight from Zuehl Airport…
- [Incident 20250706012089I](https://openairdocs.org/incident/20250706012089I), Jul 6, 2025: Bellanca 14-13 (N86719), Lakeville, MN, Minor damage. PIC departed to destination airport. PIC stated that due to an aviation event at the destination airport the traffic pattern was busier than usual.…
- [Accident 20250614007309A](https://openairdocs.org/incident/20250614007309A), Jun 14, 2025: Stinson 108 (N2101Q), Denali National, AK, Substantial damage. The pilot performed an initial surveying pass from west to east to ensure the airstrip was clear of obstructions. The pilot entered a east downwind approach.…
- [Accident 20250603006879A](https://openairdocs.org/incident/20250603006879A), Jun 3, 2025: Universal Stinson 108 (N40158), Mocksville, NC, Destroyed, 2 fatal. On June 03, 2025, a Universal Stinson 180 touched down midfield on runway 02L at the Sugar Valley Airport (5NC2) and lifted the left wheel to avoid a turtle.…
- [Incident 20240609010159I](https://openairdocs.org/incident/20240609010159I), Jun 9, 2024: Bellanca 14-13-3 (N6504N), Wilton, CA, Minor damage. The pilot took off from sacramento executive airport on June 09, 2024 at approximately 11:30AM local time, headed to columbia airport O22 . Upon leveling out…
- [Accident 20240425003999A](https://openairdocs.org/incident/20240425003999A), Apr 25, 2024: Stinson 108 (N97517), Bolivar, OH, Substantial damage. Flying heading 090 @ 1,500AGL from urbana (I74) to minerva, OH (OH15) 16 mi west of minerva pilot experience engine running rough. Whent thru emergency…
- [Accident 20240314003979A](https://openairdocs.org/incident/20240314003979A), Mar 14, 2024: Stinson 108 (N9041K), Houston, AK, Substantial damage. Afternoon of March. 14th 2024 pilot brought aircraft on skis out of hanger to load and fuel for preparation for flight. Pilot fueled right tank only with…
- [Incident 20230921013889I](https://openairdocs.org/incident/20230921013889I), Sep 21, 2023: Stinson 108 (N200LG), El Dorado, KS, Minor damage. On 09/21/2023 at approximately 11:55AM a Stinson 108 aircraft while taxiing for fuel the left elevator contacted a vehicle right forward fender at El Dorado /…
- [Accident 20230712014659A](https://openairdocs.org/incident/20230712014659A), Jul 12, 2023: Stinson 108 (N97719), Ninilchik, AK, Substantial damage. From FAA form 8020-9 aircraft accident/incident preliminary notice, block/item 5.: emergency landing on a secondary dirt road and clipped wing on a road sign…
- [Accident 20230711013609A](https://openairdocs.org/incident/20230711013609A), Jul 11, 2023: Stinson 108-1 (N8889K), Burlington, WA, Destroyed. During landing pilot failed to maintain control of the aircraft. The aircraft vacated the runway surface area into the grass and became airborne. Unable to…
- [Incident 20230225009129I](https://openairdocs.org/incident/20230225009129I), Feb 25, 2023: Stinson 108-1 (N8748K), Columbus, MS, Minor damage. Pilot stated that on initial touchdown the plane yawed to the right and was corrected with left rudder;as the nose came back to the left, the wind picked the…
- [Accident 20230212002169A](https://openairdocs.org/incident/20230212002169A), Feb 12, 2023: Stinson 108-1 (N8135K), Morgan, UT, Substantial damage. Pilot touched down and slowed. The tailwheel touched down as well. The aircraft started to turn left, pilot applied right rudder. Right rudder was too abrupt…
- [Incident 20230108000509I](https://openairdocs.org/incident/20230108000509I), Jan 8, 2023: Stinson 108-1 (N9033K), Anoka, MN, Minor damage. 2023-01-08 [privacy data omitted] went off left side of runway during landing and struck snowbank, 2 on board no injuries and minor damage. CFI was in the…
- [Accident 20220730013609A](https://openairdocs.org/incident/20220730013609A), Jul 30, 2022: Stinson 108-1 (N9162K), Columbus, OH, Substantial damage. [privacy data omitted], Stinson, lhq-cmh, landing runway 28R, landed hard, left gear broke and folded under cabin. Striking left wing on ground and prop.…
- [Incident 20220607009639I](https://openairdocs.org/incident/20220607009639I), Jun 7, 2022: Universal Stinson 108 (N97421), Juneau, AK, Minor damage. The pilot in command and passenger/pilot statements and interviews revealed that they were flying loop patterns around the Juneau area. After completing a…
- [Accident 20211008019919A](https://openairdocs.org/incident/20211008019919A), Oct 8, 2021: Stinson 108 (N677JD), Cabot, AR, Substantial damage. On Friday October 8, 2021, N677JD, a stenson 108, was involved in an off-field landing in graystone, AR. The airman was on a cross country flight from…
- [Accident 20210802012339A](https://openairdocs.org/incident/20210802012339A), Aug 2, 2021: Stinson 108-1 (N8656K), Sterling, AK, Substantial damage. On August 2, 2021 at approximately 2:58 pm local time, N8656K, a Stinson 108-1, was substantially damaged during an emergency Landing following a partial…
- [Accident 20210725011829A](https://openairdocs.org/incident/20210725011829A), Jul 25, 2021: Stinson 108-1 (N8844K), Boseman, MT, Substantial damage. On landing, pilot experienced right drift due to un anticipated/forecasted wind and was unable to retain control of aircraft and maintain runway alignment.…
- [Incident 20201209018029I](https://openairdocs.org/incident/20201209018029I), Dec 9, 2020: Stinson 108-2 (N340C), Burleson, TX, Minor damage. The pilot landed on 17L, taxiied off at echo taxiway, turned south onto taxiway alpha. He then passed behind a stationary falcon-900. At that point, he…
- [Incident 20200604007839I](https://openairdocs.org/incident/20200604007839I), Jun 4, 2020: Stinson 108 (N87607), Yakima, WA, Minor damage. Pilot conducted a wheel landing on runway 4, at the proper speed and landed on runway centerline. The airplane swerved to the left and the pilot was unable to…
- [Incident 20200123001709I](https://openairdocs.org/incident/20200123001709I), Jan 23, 2020: Stinson 108-1 (N97644), Hays, KS, Minor damage. During down wind taxiing to the take off runway, the pilot started a turn to take the active runway. He admits he became distracted by a back seat passenger…
- [Accident 20190901014679A](https://openairdocs.org/incident/20190901014679A), Sep 1, 2019: Stinson 108 (N97699), Bandera, WA, Substantial damage. Pilot was going to practice an aborted takeoff and did not intend to be airborne. The aircraft did break ground and became airborne. Due to ground effect, he…
- [Accident 20190119000309A](https://openairdocs.org/incident/20190119000309A), Jan 19, 2019: Stinson 108-1 (N97969), Shawano, WI, Destroyed. The pilot in command stated that on January 18, 2019 he went to bed at 2130 and woke up on January 19, 2019 at 0630. He stated that he felt good and he was not…
- [Incident 20180930019319I](https://openairdocs.org/incident/20180930019319I), Sep 30, 2018: Stinson 108-1 (N8599K), Mayo, FL, No damage. On September 30, 2018, at 1053 EST a 1947 Stinson, model 108-1, N8599K that is registered to [privacy data omitted], had an engine power problem during cruise…
- [Incident 20180825015299I](https://openairdocs.org/incident/20180825015299I), Aug 25, 2018: Bellanca 14-13-2 (N74432), Hillesville, VA, Minor damage. Pilot stated that he was on final to land at twin counties airport in Hillesville VA. While still a few miles out he felt a shutter similar to driving a car…
- [Incident 20180507004849I](https://openairdocs.org/incident/20180507004849I), May 7, 2018: Stinson 108 (N97504), San Luis Obispo, CA, Minor damage. N97504 had a prop strike during its landing phase on runway 29 at sbp airport. Upon landing the airplane started yawing and hard braking led to the airplane…
- [Accident 20180427004239A](https://openairdocs.org/incident/20180427004239A), Apr 27, 2018: Stinson 108-1 (N35VM), Spokane, WA, Substantial damage. N35VM, single engine, conventional gear, Stinson 108, lost control on landing and groundlooped, departing the landing runway 04R. The pilot stated he was…
- [Accident 20180309001819A](https://openairdocs.org/incident/20180309001819A), Mar 9, 2018: Bellanca 14-13-2 (N74445), Anacortes, WA, Substantial damage. On March 9, 2018 the pilot was receiving flight instruction while also accomplishing his flight review. At, or about, 1615 local time while landing on runway…
- [Accident 20170721012569A](https://openairdocs.org/incident/20170721012569A), Jul 21, 2017: Stinson 108-1 (N8954K), Lee'S Summit, MO, Substantial damage. After a normal landing at klxt, the pilot applied brakes. The left brake pedal responded as expected but the right pedal went all the way to the floor. Left…
- [Accident 20161018017639A](https://openairdocs.org/incident/20161018017639A), Oct 18, 2016: Stinson 108 (N97634), Austin, TX, Substantial damage. 1. Description of accident: the accident occurred on 10/18/2016 at Austin executive (kedc). The type of aircraft was a Stinson 108, with a conventional…
- [Accident 20161001019769A](https://openairdocs.org/incident/20161001019769A), Oct 1, 2016: Culver PQ-14A (N4648V), Long View, NC, Destroyed, 1 fatal. On October 1, 2016 at 1310 local time a Culver PQ-14A, N4648V, was destroyed during collision with trees, terrain, and a commercial building during a forced…
- [Accident 20160430004319A](https://openairdocs.org/incident/20160430004319A), Apr 30, 2016: Universal Stinson 108 (N8660K), Calverton, NY, Substantial damage. At approximately 10:30 am local time, [privacy data omitted]pilot attempted to land at Calverton airport due to engine having problems/missing. Pilot stated…
- [Accident 20151219022179A](https://openairdocs.org/incident/20151219022179A), Dec 19, 2015: Stinson 108 (N97411), Portales, NM, Substantial damage. ? On December 19, 2015 at 1410MST a 1946 Stinson 108 aircraft bearing registration number N97411 registered to the private owner, experienced a loss of control…
- [Accident 20151203020739A](https://openairdocs.org/incident/20151203020739A), Dec 3, 2015: Stinson 108 (N97537), Medicne Lodge, KS, Substantial damage. On December 3, 2015, at approximately 1632 central daylight time (CDT) (2232 UTC), the airman, holder of commercial pilot certificate and pilot-in-command…
- [Incident 20151023023989I](https://openairdocs.org/incident/20151023023989I), Oct 23, 2015: Bellanca 14-13 (N74267), Macon, GA, Minor damage. Pilot stated that he became distracted during his approach into the airport and forgot to lower the landing gear. Pilot states that he used the landing check…
- [Accident 20150614009189A](https://openairdocs.org/incident/20150614009189A), Jun 14, 2015: Stinson 108 (N97505), Dushore, PA, Substantial damage. Pilot stated that he performed an engine run up the day prior to the accident. He stated all engine parameters were fine. The following morning he started the…
- [Accident 20150415009739A](https://openairdocs.org/incident/20150415009739A), Apr 15, 2015: Universal Stinson 108-1 (N9799G), Macon, MS, Substantial damage. According to the pilot of the aircraft, he stated the engine running rough. He determined he could not make it to his distination and began to search for a…
- [Accident 20140718012369A](https://openairdocs.org/incident/20140718012369A), Jul 18, 2014: Stinson 108-1 (N9034K), Bruno, MN, Substantial damage. Pilot reported that approximately 1/2 hour into a flight from kdyt to 8Y4 while at an altitude of approximately 2000' AGL, the engine sputtered for…
- [Incident 20140622010909I](https://openairdocs.org/incident/20140622010909I), Jun 22, 2014: Stinson 108 (N40106), Auburn, IN, No damage. Aircraft departed seneca county Ohio K16G, enroute to joliet regional, kjot at about 3 miles east of Auburn, IN kgwb the engine seized. Aircraft landed in a…
- [Accident 20131227025839A](https://openairdocs.org/incident/20131227025839A), Dec 27, 2013: Stinson 108-1 (N8848K), Lodi, CA, Substantial damage. Pilot in command (PIC) fueled up at medesto airport (30 gallons) and took off from medesto airport to Lodi airport without incident and landed safely at the…
- [Accident 20130919020149A](https://openairdocs.org/incident/20130919020149A), Sep 19, 2013: Universal Stinson 108-1 (N8384K), Lawrenceville, GA, Substantial damage. Pilot was flying PT91. After approximately 1 hour flight. Pilot was attempting to land the aircraft. Pilot stated that he felt the tail settle during initial…
- [Incident 20130824016849I](https://openairdocs.org/incident/20130824016849I), Aug 24, 2013: Stinson 108 (N8547K), Louisa, VA, Minor damage. As reported by pilot, right after rotation he realized that his rate of climb was only 500 fpm, instead of the expected 1600. The engine started popping and…
- [Incident 20130815025489I](https://openairdocs.org/incident/20130815025489I), Aug 15, 2013: Bellanca 14-13-3 (N1413B), Cleburne, TX, Minor damage. Pilot failed to lower landing gear prior to landing. In this aircraft, the lower half of the wheel/tire is exposed when in the up position. The aircraft rolled…
- [Incident 20130806017069I](https://openairdocs.org/incident/20130806017069I), Aug 6, 2013: Universal Stinson 108-1 (N97048), California, PA, Minor damage. Aircraft lost power during cruise, made an emergency landing on Pennsylvania turnpike route 43, southbound, near exit 30.
- [Accident 20130718017199A](https://openairdocs.org/incident/20130718017199A), Jul 18, 2013: Stinson 108-1 (N8721K), Tuftonboro, NH, Substantial damage. Aircraft departed 5M3 with full fuel. On level off at 1800MSL PIC began leaning mixture when engine began running very rough. Aircraft lost power, oil pressure…
- [Accident 20130714013399A](https://openairdocs.org/incident/20130714013399A), Jul 14, 2013: Universal Stinson 108-1 (N855F), Hector, MN, Substantial damage. Pilot lined up for departure from runway 23 at the Hector, MN airport (1D6). She applied one notch of flaps as she was going to perform a soft field takeoff…
- [Accident 20130604010779A](https://openairdocs.org/incident/20130604010779A), Jun 4, 2013: Stinson 108 (N97592), Elkton, KY, Substantial damage. Aircraft departed 5KY4. Lost power. Came to rest upside down in a field approximately 300 yards away from end of runway.
- [Accident 20130604008559A](https://openairdocs.org/incident/20130604008559A), Jun 4, 2013: Stinson 108 (N677JD), Lebanon, IN, Substantial damage. On June 4, 2013, the pilot departed Boone County Airport at 12:40 pm local time for a local 20 to 30 minute VFR flight. Upon returning to the Boone County…
- [Accident 20130517006849A](https://openairdocs.org/incident/20130517006849A), May 17, 2013: Stinson 108-1 (N8931K), Cambridge, MN, Substantial damage. After landing on runway 16 at Cambridge, MN (cbg), the pilot lost directional control and departed the left side of runway, struck left wing tip on the ground…

All 375: https://openairdocs.org/engine/franklin-6a4150-series/incidents.md

## Service difficulty reports (3)

As reported by operators and repair stations, by the model named in the report.

- [SDR 2007FA0000257](https://openairdocs.org/sdr/2007FA0000257), Feb 24, 2007: ROCKER SHAFT. BROKEN. THE NR 3 CYLINDER ROCKER ARM SHAFT FAILED (BROKE) AT THE CENTER SUPPORT POSITION. ADDITIONALLY, (2) OF THE (3) ROCKER ARM BOSS SECURING BOLTS FAILED AND THE THI
- [SDR MASA200400073](https://openairdocs.org/sdr/MASA200400073), Feb 7, 2004: BULB. BURNED OUT. DURING PREFLIGHT THE RT FWD EXTERIOR EMERGENCY LIGHT INOPERATIVE. MECHANIC REPLACED BULB.
- [SDR 20010403CW003](https://openairdocs.org/sdr/20010403CW003), Sep 16, 2000: SPINNER. DESTROYED. ON CLIMBOUT A VIBRATION DEVELOPED THAT CONTINUED TO INCREASE IN AMPLITUDE. THE FLIGHT WAS ABORTED. SUBSEQUENT INVESTIGATION REVEALED THAT THE FORWARD PLASTIC SP

## STCs that may be installed (OpenAirDocs) (16)

Approved for this engine model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has.

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC. Lists 6A4-150-B3
- [STC SE2932SW](https://openairdocs.org/stc/SE2932SW): Install carburetor air temperature indicator. Approved for Aircooled Motors (Franklin Engine Co.) equipped with float carburetors. Model eligibility included here may not be inclusive. Alcor LLC. Lists 6A4-150-B3
- [STC SE1311SO](https://openairdocs.org/stc/SE1311SO): Installation of Shivers carburetor temperature gauge with a Richter Aero Equipment B-5 carburetor temperature probe. LegacySTC.com. Lists 6A4-150-B3
- [STC SE03309CH](https://openairdocs.org/stc/SE03309CH): Installation of Engine Preheat Kit, p/n TSP6CYL-2927-115 for 115 volt application. Hartzell Propeller Inc. Lists 6A4-150-B3
- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc. Lists 6A4-150-B3
- [STC SE4178NM](https://openairdocs.org/stc/SE4178NM): Installation of oil filter kit. Franklin Aircraft Engines Inc. Lists 6A4-150-B3
- [STC SE1673CE](https://openairdocs.org/stc/SE1673CE): Replace camshaft and valve train with parts from Model 6A4-165-B3 engine. David James. Lists 6A4-150-B3
- [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc. Lists 6A4-150-B3
- [STC SE3331NM](https://openairdocs.org/stc/SE3331NM): Lycoming valve cover gasket. Real Gaskets Tennessee. Lists 6A4-150-B3
- [STC SE110CH](https://openairdocs.org/stc/SE110CH): Installation of Slick Model 6399 magnetos. Champion Aerospace LLC. Lists 6A4-150-B3
- [STC SE1-201](https://openairdocs.org/stc/SE1-201): Installation of the Richter Aero Equipment Type B-4 or B-5 Temperature Probe. (O-360 SERIES (excl. A1C, C2B, C2D)). MidContinent Instru Co Inc. Lists 6A4-150-B3
- [STC SE1696GL](https://openairdocs.org/stc/SE1696GL): Installation of nose seal retainer. Skaggs Robert G. Lists 6A4-150-B3
- [STC SE2127CE](https://openairdocs.org/stc/SE2127CE): Add the following approved fuel unleaded automotive gasoline, 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index (RON+MON)/2. Intermixing with aviation gasoline also approved. Petersen Aviation Inc. Lists 6A4-150-B3
- [STC SE61WE](https://openairdocs.org/stc/SE61WE): SERIAL NUMBER 12434 ONLY: Installation of modified Franklin Part Non. 19182 dual magneto/vacuum pump drive. Satisfactory for Franklin Model 6A4-150-B3 engine, Serial No. 12434 only. G.C. Schinneller. Lists 6A4-150-B3
- [STC SE59WE](https://openairdocs.org/stc/SE59WE): SERIAL NUMBER 11514 ONLY: Installation of modified Franklin Part No. 19182 dual magneto/vacuum pump drive. John W. German. Lists 6A4-150-B3
- [STC SE4-1192](https://openairdocs.org/stc/SE4-1192): Adapter to permit Bendix Scintilla magneto installation, Type SF6LN-8, and modification of carburetor- manifold adapter box. Van De Water Devel Co. Lists 6A4-150-B3

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