# N451JR: Hughes 269B - Status: Valid registration - Airframe: [Hughes 269B](https://openairdocs.org/model/hughes-269b) (registry code 4470502, 3 seats) - Engine: [Lycoming HO-360 series](https://openairdocs.org/engine/lycoming-ho-360-series) (registry code 41513) - Data sheets: [TCDS 4H12](https://openairdocs.org/tcds/4H12) (Schweizer RSG LLC), [TCDS E-286](https://openairdocs.org/tcds/E-286) (Lycoming Engines) (OpenAirDocs) - Serial number: 65-0212 - Type: Rotorcraft - Engine type: Reciprocating - Airworthiness: Restricted, other - Airworthiness date: April 17, 1969 - Certificate issued: October 6, 2022 - Expires: October 31, 2029 - Mode S code: A576AB - Registered owner: [Fathom Aviation LLC](https://openairdocs.org/faa-owner/FATHOM%20AVIATION%20LLC) - Location: [Burley, WA](https://openairdocs.org/faa-place/WA/Burley) - Owner type: LLC - Owner's area on the map: 47.4160° N, 122.6447° W: Placed by OpenAirDocs: center of Burley, WA, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=451JR - Page: https://openairdocs.org/aircraft/N451JR From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Lycoming HO-360 model are included. ## ADs that may apply (OpenAirDocs): 58 in force ### Matched by airframe (Hughes 269B) - [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07): Ground Proximity System · Airbus Helicopters 47, 206, 210 and 237 more. Effective Jun 22, 2023 - [AD 2017-14-06](https://openairdocs.org/ad/2017-14-06): Main Rotor Drive System · Sikorsky 269A, 269A-1, 269B and 3 more. Effective Aug 25, 2017 - [AD 2015-23-01](https://openairdocs.org/ad/2015-23-01): Tail Rotor Drive · Sikorsky 269A, 269A-1, 269B and 3 more. Effective Dec 15, 2015 - [AD 2011-12-16](https://openairdocs.org/ad/2011-12-16): Rotorcraft Tailboom · Schweizer 269A, 269A-1, 269B and 2 more. Effective Jul 21, 2011 - [AD 2003-13-15 R1](https://openairdocs.org/ad/2003-13-15-R1): Aft cluster fittings · Schweizer 269A, 269A-1, 269B and 1 more. Effective Aug 10, 2004 - [AD 2000-16-05](https://openairdocs.org/ad/2000-16-05): Tail Rotor Swashplate Shaft · Schweizer 269A, 269A-1, 269B and 3 more. Effective Sep 19, 2000 - [AD 98-18-11](https://openairdocs.org/ad/98-18-11): Main Rotor Blade · Schweizer 269A, 269A-1, 269B and 2 more. Effective Oct 7, 1998 - [AD 97-23-06](https://openairdocs.org/ad/97-23-06): Ring Gear Teeth Inspection · Schweizer 269A, 269A-1, 269B and 1 more. Effective Dec 10, 1997 - [AD 97-05-06](https://openairdocs.org/ad/97-05-06): Main Rotor Thrust Bearing · Schweizer 269A, 269A-1 and 269B. Effective Apr 7, 1997 - [AD 95-21-02](https://openairdocs.org/ad/95-21-02): Main Rotor Drive Shaft · Schweizer 269A, 269A-1, 269B and 1 more. Effective Nov 17, 1995 - [AD 95-03-12](https://openairdocs.org/ad/95-03-12): Clutch Control Spring Assembly · Schweizer 269A, 269A-1, 269B and 1 more. Effective Mar 1, 1995 - [AD 94-16-04](https://openairdocs.org/ad/94-16-04): Tail Rotor Pedal support Structure · Schweizer 269A, 269A-1, 269B and 1 more. Effective Oct 5, 1994 - [AD 94-12-06](https://openairdocs.org/ad/94-12-06): Lower Pulley Bearings · Schweizer 269A, 269A-1, 269B and 1 more. Effective Sep 19, 1994 - [AD 94-13-04](https://openairdocs.org/ad/94-13-04): Clutch Control Spring Assembly · Schweizer 269A, 269A-1, 269B and 1 more. Effective Sep 1, 1994 - [AD 93-21-03](https://openairdocs.org/ad/93-21-03): Magnesium Tailboom Fitting · Schweizer 269A, 269A-1 and 269B. Effective Dec 17, 1993 - [AD 93-05-11](https://openairdocs.org/ad/93-05-11): Fuel Pump Drain Tube Assembly · Schweizer 269A, 269A-1, 269B and 1 more. Effective May 25, 1993 - [AD 89-20-03 R1](https://openairdocs.org/ad/89-20-03-R1): Tail Rotor Blades · Schweizer 269A, 269A-1, 269B and 1 more. Effective Feb 22, 1991 - [AD 90-06-10](https://openairdocs.org/ad/90-06-10): Throttle Cable Assembly · Schweizer 269A, 269A-1, 269B and 1 more. Effective Apr 6, 1990 - [AD 88-17-04](https://openairdocs.org/ad/88-17-04): Aft Cluster Fittings · Schweizer 269A, 269A-1, 269B and 1 more. Effective Aug 19, 1988 - [AD 82-15-01 R1](https://openairdocs.org/ad/82-15-01-R1): Main Transmission · Schweizer 269A, 269A-1, 269B and 1 more. Effective Oct 4, 1982 - [AD 82-15-03](https://openairdocs.org/ad/82-15-03): Rotor System · Schweizer 269A, 269A-1, 269B and 1 more. Effective Jul 16, 1982 - [AD 81-17-01](https://openairdocs.org/ad/81-17-01): Starting Vibrator Assemblies · Bendix Starting Vibrator Assemblies, B-2, B-2A and 49 more. Effective Aug 13, 1981 - [AD 79-23-03 R1](https://openairdocs.org/ad/79-23-03-R1): Tail Rotor Blades · Schweizer 269A, 269A-1, 269B and 1 more. Effective Nov 19, 1979 - [AD 78-26-04](https://openairdocs.org/ad/78-26-04): Tail Rotor Hub Assembly · Schweizer 269A, 269A-1, 269B and 6 more. Effective Dec 27, 1978 - [AD 78-25-04](https://openairdocs.org/ad/78-25-04): Pinion Assemblies · Schweizer 269A, 269A-1, 269B and 1 more. Effective Dec 18, 1978 - [AD 78-02-02](https://openairdocs.org/ad/78-02-02): Tail Rotor Control Pedals · Schweizer 269A, 269A-1, 269B and 1 more. Effective Jan 24, 1978 - [AD 77-23-08](https://openairdocs.org/ad/77-23-08): Cracks in Main Rotor Blades · Schweizer 269A, 269A-1 and 269B. Effective Dec 27, 1977 - [AD 77-07-01](https://openairdocs.org/ad/77-07-01): Clutch Actuator · Schweizer 269A, 269A-1, 269B and 1 more. Effective Apr 4, 1977 - [AD 76-10-02](https://openairdocs.org/ad/76-10-02): Lateral control · Schweizer 269A, 269A-1, 269B and 1 more. Effective May 21, 1976 - [AD 75-15-02](https://openairdocs.org/ad/75-15-02): Throttle and Engine Power Control · Schweizer 269A, 269A-1 and 269B. Effective Jul 15, 1975 - [AD 74-21-04](https://openairdocs.org/ad/74-21-04): Canopy Slats · Schweizer 269A, 269A-1, 269B and 1 more. Effective Apr 4, 1975 - [AD 75-08-12](https://openairdocs.org/ad/75-08-12): Actuator and Cover · Schweizer 269A, 269A-1, 269B and 1 more. Effective Mar 7, 1975 - [AD 71-20-05](https://openairdocs.org/ad/71-20-05): Idler Pulley Bearings · Schweizer 269A, 269A-1 and 269B. Effective Dec 18, 1971 - [AD 70-08-01](https://openairdocs.org/ad/70-08-01): Flapping Hinge Bolts · Schweizer 269A, 269A-1 and 269B. Effective Apr 14, 1970 - [AD 70-01-06](https://openairdocs.org/ad/70-01-06): Lateral pitch idler bell crank · Schweizer 269A, 269A-1 and 269B. Effective Jan 17, 1970 - [AD 69-04-03](https://openairdocs.org/ad/69-04-03): Rotor Blade · Schweizer 269A, 269A-1 and 269B. Effective Mar 22, 1969 - [AD 68-26-01](https://openairdocs.org/ad/68-26-01): Lower Coupling Drive Shaft · Schweizer 269A, 269A-1 and 269B. Effective Dec 21, 1968 - [AD 64-28-02](https://openairdocs.org/ad/64-28-02): Main Rotor Blade Flapping Hinge Bearing · Schweizer 269A, 269A-1 and 269B. Effective Jul 6, 1968 - [AD 67-21-01](https://openairdocs.org/ad/67-21-01): Air Scoop · Schweizer 269A, 269A-1 and 269B. Effective Jul 3, 1967 - [AD 67-11-03](https://openairdocs.org/ad/67-11-03): Main Rotor Gear Drive · Schweizer 269A, 269A-1 and 269B. Effective Apr 7, 1967 - [AD 66-03-02](https://openairdocs.org/ad/66-03-02): Electrical System · Schweizer 269A, 269A-1 and 269B. Effective Jan 14, 1966 - [AD 64-06-04](https://openairdocs.org/ad/64-06-04): Lower Coupling Drive Shaft · Schweizer 269A, 269A-1 and 269B. Effective Mar 18, 1964 - [AD 69-21-01](https://openairdocs.org/ad/69-21-01): Failure of Input Pinion Shaft · Schweizer 269A, 269A-1, 269B and 4 more ### Matched by engine (Lycoming HO-360 series) - [AD 2026-04-11](https://openairdocs.org/ad/2026-04-11): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 605 more. Effective Apr 8, 2026 - [AD 2017-16-11](https://openairdocs.org/ad/2017-16-11): Reciprocating Engine Power Section · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-360-B1G6 and 93 more. Effective Aug 15, 2017 - [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012 - [AD 2009-26-12](https://openairdocs.org/ad/2009-26-12): Cylinder assemblies · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 264 more. Effective Feb 4, 2010 - [AD 2009-02-03](https://openairdocs.org/ad/2009-02-03): Fuel injection servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 261 more. Effective Feb 9, 2009 - [AD 2006-12-07](https://openairdocs.org/ad/2006-12-07): ECi cylinder assemblies · Aerostar AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 386 more. Effective Jul 11, 2006 - [AD 2006-10-21](https://openairdocs.org/ad/2006-10-21): ECi connecting rods · Engine Components Reciprocating Engine Connecting Rods, AEIO-360-B1B, AEIO-360-B1D and 171 more. Effective Jun 22, 2006 - [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004 - [AD 97-15-11](https://openairdocs.org/ad/97-15-11): Cylinder kits · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 538 more. Effective Aug 12, 1997 - [AD 96-09-10](https://openairdocs.org/ad/96-09-10): Oil pump · Lycoming Engines AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A and 334 more. Effective Jul 15, 1996 - [AD 95-07-01](https://openairdocs.org/ad/95-07-01): Connecting Rod Bolt · Lycoming Engines AEIO-360-A1E, AEIO-360-B1G6, AEIO-360-H1A and 177 more. Effective Apr 12, 1995 - [AD 92-12-05](https://openairdocs.org/ad/92-12-05): Piston Pins · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 532 more. Effective Jul 10, 1992 - [AD 90-04-06 R1](https://openairdocs.org/ad/90-04-06-R1): Propeller Governor External Oil Line · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 427 more. Effective May 28, 1991 - [AD 87-10-06 R1](https://openairdocs.org/ad/87-10-06-R1): Rocker Arm Assembly · Lycoming Engines IO-360-B4, IVO-360-A1A, O-340-A1A and 243 more. Effective Sep 1, 1989 - [AD 75-08-09](https://openairdocs.org/ad/75-08-09): Oil Pump Drive Shaft · Lycoming Engines AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C and 365 more. Effective Aug 18, 1977 ### Historical (superseded or no longer in force) - [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13) (historical): Ground Proximity System · Airbus Helicopters K-225, K-190A, K-240 and 237 more. Effective Dec 9, 2021 - [AD 2011-01-52](https://openairdocs.org/ad/2011-01-52) (historical): Rotorcraft Tailboom · Schweizer 269A, 269A-1, 269B and 2 more - [AD 2003-13-15](https://openairdocs.org/ad/2003-13-15) (historical): Tailboom Support Strut or Lug on Cluster Fitting · Schweizer 269A, 269A-1, 269B and 1 more. Effective Aug 12, 2003 - [AD 2001-25-52](https://openairdocs.org/ad/2001-25-52) (historical): Strut Clevis Lug on Center Frame Aft Cluster Fitting · Schweizer 269A, 269A-1, 269B and 1 more. Effective May 8, 2002 - [AD 99-17-10](https://openairdocs.org/ad/99-17-10) (historical): Shaft · Schweizer 269A, 269A-1, 269B and 3 more. Effective Sep 2, 1999 - [AD 93-17-13](https://openairdocs.org/ad/93-17-13) (historical): Lower Coupling Drive Shaft · Schweizer 269A, 269A-1, 269B and 1 more. Effective Oct 20, 1993 - [AD 76-18-01](https://openairdocs.org/ad/76-18-01) (historical): Tail boom support strut · Schweizer 269A, 269A-1, 269B and 3 more. Effective Sep 7, 1976 - [AD 2024-21-02](https://openairdocs.org/ad/2024-21-02) (historical): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 548 more. Effective Dec 5, 2024 - [AD 2008-19-05](https://openairdocs.org/ad/2008-19-05) (historical): Parallel Valve'' reciprocating engines · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 262 more. Effective Oct 20, 2008 - [AD 2005-26-10](https://openairdocs.org/ad/2005-26-10) (historical): ECi cylinder assemblies. · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 413 more. Effective Jan 31, 2006 - [AD 81-18-04 R2](https://openairdocs.org/ad/81-18-04-R2) (historical): Engine Oil Pump Driven Impeller and Shaft · Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 376 more. Effective Jun 7, 1982 ## Information bulletins (advisory) (4 in force) - [SAIB SW-09-44](https://openairdocs.org/saib/SW-09-44): Cabin door. Issued Jul 28, 2009 - [SAIB NE-19-08](https://openairdocs.org/saib/NE-19-08): Reciprocating Engine Cylinder Section - Lycoming Engines Parallel Valve Cylinders. Issued May 2, 2019 - [SAIB NE-14-13](https://openairdocs.org/saib/NE-14-13): Reciprocating Engine - Cylinder Mounting Studs. Issued Mar 24, 2014 - [SAIB NE-06-32R1](https://openairdocs.org/saib/NE-06-32R1): Reciprocating Engine - Crankshaft. Issued Sep 10, 2008 ## NTSB investigations None matched to N451JR. ## FAA accident and incident reports None matched to N451JR. ## Service difficulty reports None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. ## STCs that may be installed (OpenAirDocs) (129, first 50) Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do. ### Approved for the airframe (Hughes 269B) - [STC SA800EA](https://openairdocs.org/stc/SA800EA): Installation of Whelen Anti-Collision, Position, or Anti-Collision/Position Light System, and applicable associated power supplies. Whelen Aerospace Technologies - [STC SR00006DE](https://openairdocs.org/stc/SR00006DE): Installation of Inframetics IRTV-445G infrared imaging system. Dart Aerospace Company - [STC SH2726NM](https://openairdocs.org/stc/SH2726NM): Installation of a cabin heater. Dart Aerospace USA Inc - [STC SH5248NM](https://openairdocs.org/stc/SH5248NM): Installation of external pod, camera mount, and 12 volt power provision. Dart Aerospace USA Inc - [STC SH4036NM](https://openairdocs.org/stc/SH4036NM): Installation of door actuators. Dart Aerospace USA Inc - [STC SR00038DE](https://openairdocs.org/stc/SR00038DE): Installation of supplemental lubrication kit for lower drive shaft. Dart Aerospace USA Inc - [STC SH3319NM](https://openairdocs.org/stc/SH3319NM): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,. Precise Flight Inc - [STC SA11137SC](https://openairdocs.org/stc/SA11137SC): Installation of Plane-Power ALT-FLX alternator. Hartzell Engine Technologies, LLC - [STC SR01838AT](https://openairdocs.org/stc/SR01838AT): Installation of Cyclic Friction Release Levers. Thoroughbred Aviation Maintenance Inc. Lists 269 Series - [STC SR02704SE](https://openairdocs.org/stc/SR02704SE): Installation and maintenance of the Sunspot 36 and 46 series lights. AeroLED's Holdings LLC - [STC SH2334SO](https://openairdocs.org/stc/SH2334SO): Installation of a cabin heater/defroster. Schweizer RSG LLC - [STC SH34WE](https://openairdocs.org/stc/SH34WE): Installation of 'Tote-All' luggage/cargo carrier. Schweizer RSG LLC - [STC SH7WE](https://openairdocs.org/stc/SH7WE): Fabrication of Precision Helicopters Model 4887 Cargo Rack System. Schweizer RSG LLC - [STC SA615EA](https://openairdocs.org/stc/SA615EA): Installation of a Whelen Anti-Collision Strobe Light System as replacement for originally installed anti-collision lights. Whelen Aerospace Technologies - [STC SR00359BO](https://openairdocs.org/stc/SR00359BO): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies - [STC SH444NE](https://openairdocs.org/stc/SH444NE): Installation of Whelen Strobe Lights. Schweizer RSG LLC - [STC SH586EA](https://openairdocs.org/stc/SH586EA): Installation of Hartzell Anti-Overspeed kits (D-3520-1 and D-3520-2). Schweizer RSG LLC - [STC SH1065NE](https://openairdocs.org/stc/SH1065NE): Installation of Airwolf Model AFC-500 full flow engine oil filter P/N AFC-500. Airwolf Filter Corporation - [STC SA2586NM](https://openairdocs.org/stc/SA2586NM): Installation of J.P. Instruments temperature monitoring systems. J P Instruments - [STC SR02487AK](https://openairdocs.org/stc/SR02487AK): Installation of L-3 Communications Avionics Systems ESI-500 Standby Instrument System. ADS-B Technologies, LLC - [STC SR02470AK](https://openairdocs.org/stc/SR02470AK): Installation of the L-3 Communications NGT -1000/2000/2500 ADS-B System. ADS-B Technologies, LLC - [STC SR02471AK](https://openairdocs.org/stc/SR02471AK): Installation of the L-3 Communications NGT -9000/9000R ADS-B System. ADS-B Technologies, LLC - [STC SR02394AK](https://openairdocs.org/stc/SR02394AK): Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system. Seaplanes North LLC - [STC SH1839NM](https://openairdocs.org/stc/SH1839NM): Installation of Skytronics, Part No. 7150T-300-1 Alternators. Hartzell Engine Technologies, LLC - [STC SA00432SE](https://openairdocs.org/stc/SA00432SE): Installation of EGT 701 series fuel flow instrument. J P Instruments - [STC SA00861SE](https://openairdocs.org/stc/SA00861SE): Installation of J.P. Instruments (JPI) fuel flow indicating system. J P Instruments - [STC SH202WE](https://openairdocs.org/stc/SH202WE): Installation of controls for pilot-in-command on right side. Allen J Gerbino, Gerbino Flight Systems - [STC SH249WE](https://openairdocs.org/stc/SH249WE): Installation of a searchlight kit. Allen J Gerbino, Gerbino Flight Systems - [STC SH258WE](https://openairdocs.org/stc/SH258WE): Installation of MCT-10 mounting rack. Allen J Gerbino, Gerbino Flight Systems - [STC SH259WE](https://openairdocs.org/stc/SH259WE): Installation of utility compartment. Allen J Gerbino, Gerbino Flight Systems - [STC SH286WE](https://openairdocs.org/stc/SH286WE): Installation of Tayburn antenna deployment system. Allen J Gerbino, Gerbino Flight Systems - [STC SH290WE](https://openairdocs.org/stc/SH290WE): Installation of a 'T' instrument console. Allen J Gerbino, Gerbino Flight Systems - [STC SH152WE](https://openairdocs.org/stc/SH152WE): Installation of Hoskins Model 700801 Anti-collision light system. BF Goodrich Aerospace - [STC SH152AWE](https://openairdocs.org/stc/SH152AWE): Installation of Hoskins Model 700801 Anti-collision light system in accordance with Hoskins Drawing No. 10-201969, Rev D. Dated August 14, 1972. BF Goodrich Aerospace - [STC SH1018CE](https://openairdocs.org/stc/SH1018CE): Install landing gear damper piston. Kinzie Industries Inc - [STC SH1047CE](https://openairdocs.org/stc/SH1047CE): Install modified landing gear damper. Kinzie Industries Inc - [STC SH1099CE](https://openairdocs.org/stc/SH1099CE): Installation of cabin heater and engine exhaust tail pipe extension. Kinzie Industries Inc - [STC SH1138CE](https://openairdocs.org/stc/SH1138CE): Installation of engine exhaust tail pipe extension. Kinzie Industries Inc - [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc - [STC SA4172NM](https://openairdocs.org/stc/SA4172NM): Installation of Aviation Development oil filter. Aviation Development Corporation - [STC SA593CH](https://openairdocs.org/stc/SA593CH): Install Champion SlickSTART magneto booster system. Champion Aerospace LLC - [STC SA02033AT](https://openairdocs.org/stc/SA02033AT): Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line. M-20 Oil Separators LLC - [STC SA4005NM](https://openairdocs.org/stc/SA4005NM): Precise Flight Inc. Pulselite Control System. Precise Flight Inc - [STC SA00402SE](https://openairdocs.org/stc/SA00402SE): Installation of a remote spin-on oil filter adapter. (GC-1B w/Lycoming or Cont 360 engine installed). Aviation Development Corporation - [STC SA00680SE](https://openairdocs.org/stc/SA00680SE): Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer. Electronics International - [STC SR01430LA](https://openairdocs.org/stc/SR01430LA): Installation of Stainless Steel Skid shoes. Papas Gary Los Angeles Laboratories Inc - [STC SA02520AT](https://openairdocs.org/stc/SA02520AT): Installation of M-20 Oil Separator, model 600-WP. M-20 Oil Separators LLC - [STC SA2687NM](https://openairdocs.org/stc/SA2687NM): Installation of Truboplus/ Electronics Int'l gauges and switches. Aero Manufacturing Inc - [STC SH12CE](https://openairdocs.org/stc/SH12CE): Replace existing engine induction air filter with AC Spark Plug Filter. Brackett Aero Filters Inc - [STC SH2249NM](https://openairdocs.org/stc/SH2249NM): Installation of 36-inch main rotor blade leading edge abrasion strip. Composite Technology, Inc All 129: https://openairdocs.org/aircraft/N451JR/stcs.md ## Related - Other Hughes 269B aircraft: https://openairdocs.org/model/hughes-269b/aircraft.md - The Lycoming HO-360 series engine: https://openairdocs.org/engine/lycoming-ho-360-series.md --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.