# N79MB: 1942 Beech C18S - Status: Valid registration - Airframe: [Beech C18S](https://openairdocs.org/model/beech-c18s) (registry code 1150902, 10 seats) - Engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008) - Data sheets: [TCDS A-757](https://openairdocs.org/tcds/A-757) (Textron Aviation Inc.) (OpenAirDocs) - Serial number: 4185 - Year built: 1942 - Type: Fixed wing multi engine - Engine type: Reciprocating - Airworthiness: Standard - Airworthiness date: March 19, 1956 - Certificate issued: February 6, 2025 - Expires: February 29, 2032 - Mode S code: AAB6C1 - Registered owner: [Somers Charles M](https://openairdocs.org/faa-owner/SOMERS%20CHARLES%20M) - Location: [Hillsboro, OR](https://openairdocs.org/faa-place/OR/Hillsboro) - Owner type: Individual - Owner's area on the map: 45.5692° N, 122.9472° W: Placed by OpenAirDocs at the center of ZIP code 97124, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=79MB - Page: https://openairdocs.org/aircraft/N79MB 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 Pratt & Whitney R-985 model are included. ## ADs that may apply (OpenAirDocs): 14 in force ### Matched by airframe (Beech C18S) - [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023 - [AD 75-27-09 R2](https://openairdocs.org/ad/75-27-09-R2): Wing Structure · Textron 18A, 18D, 18S (Army C-45C) and 27 more. Effective Aug 21, 1980 - [AD 77-19-07](https://openairdocs.org/ad/77-19-07): Control Column Assembly · Textron 18A, 18D, 18S (Army C-45C) and 27 more. Effective Sep 29, 1977 - [AD 65-03-01](https://openairdocs.org/ad/65-03-01): Gap Seal Strips · Recertification under subparts B &G of CAR 3 and installation… (Staggerwing Museum Foundation STC SA2-1016 or 7 others) - [AD 53-26-01](https://openairdocs.org/ad/53-26-01): Ignition Switch · Briggs & Stratton Ignition Switches, Army AT-11, C18S and 3 more - [AD 49-15-03](https://openairdocs.org/ad/49-15-03): Fuel Tank Vent System · Textron Army AT-11 and C18S - [AD 48-51-01](https://openairdocs.org/ad/48-51-01): Control Wheel Shaft Inspection · Textron Army AT-11, C18S and D17S - [AD 48-34-01](https://openairdocs.org/ad/48-34-01): Stabilizer Attachment Fittings · Textron Army AT-11, C18S, D18C and 2 more - [AD 48-14-03](https://openairdocs.org/ad/48-14-03): Wing Center Section Spar · Textron Army AT-11 and C18S - [AD 47-33-05](https://openairdocs.org/ad/47-33-05): Horizontal Stabilizer Spar · Textron Army AT-11, C18S and D18S - [AD 47-33-04](https://openairdocs.org/ad/47-33-04): Fuel Leakage · Textron C18S - [AD 47-33-03](https://openairdocs.org/ad/47-33-03): Tail Cone Drain Holes · Textron Army AT-11 and C18S - [AD 47-06-09](https://openairdocs.org/ad/47-06-09): Landing Gear Retracting Mechanism · Textron Army AT-11 and C18S - [AD 47-06-08](https://openairdocs.org/ad/47-06-08): Starter Solenoid and Buss Lead Wires · Textron Army AT-11 and C18S ### Matched by engine (Pratt & Whitney R-985 series) None in force. ## Information bulletins (advisory) None matched. ## NTSB investigations None matched to N79MB. ## FAA accident and incident reports None matched to N79MB. ## 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) (143, 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 (Beech C18S) - [STC SA01800SE](https://openairdocs.org/stc/SA01800SE): Fabrication and installation of new or replacement of existing instrument panel lights dimmer control. TCW Technologies, LLC - [STC SA01861SE](https://openairdocs.org/stc/SA01861SE): Fabrication and installation of Landing Light Controller. TCW Technologies, LLC - [STC SA04837NY](https://openairdocs.org/stc/SA04837NY): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights. AeroLED's Holdings, LLC - [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC - [STC SA02738CH](https://openairdocs.org/stc/SA02738CH): Installation of L-3 Communications Avionics Systems. Acron Aviation Inc - [STC SA7965SW](https://openairdocs.org/stc/SA7965SW): Application of fabric and polyurethane finishing system. Shady Aviation LLC - [STC SA01240SE](https://openairdocs.org/stc/SA01240SE): Installation of secondary voltage indication system. Visual Instruments LLC - [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC - [STC SA01967WI](https://openairdocs.org/stc/SA01967WI): Use of GAMI G100UL High Octane Unleaded Avgas. General Aviation Modifications Inc - [STC SA04776NY](https://openairdocs.org/stc/SA04776NY): The HIPEC Covering and Finishing System must be performed and maintained. HIPEC Aircraft Coatings Inc - [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc - [STC SA00344BO PAGE 1](https://openairdocs.org/stc/SA00344BO%20PAGE%201): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies - [STC SA6070NM](https://openairdocs.org/stc/SA6070NM): Installation of a 'quick-disconnect drain plug' on the engine rocker sump for the oil drain retrieval system after engine shutdown. West Coast Air Creations - [STC SA01282NY](https://openairdocs.org/stc/SA01282NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K015 on aircraft powered by Pratt & Whitney radial reciprocating engine Series R-985, R-1340 and R-1830. Airwolf Filter Corporation - [STC SA02212AK](https://openairdocs.org/stc/SA02212AK): Replacement of existing landing and/or taxi light reflector and bulbs with high intensity discharge (HID) lighting systems. Seaplanes North LLC - [STC SA02428SE](https://openairdocs.org/stc/SA02428SE): Installation of an Air Stream Switch for an electric time recording device on non-pressurized aircraft. Henry F Rogers/David E Polley - [STC SA02930NY](https://openairdocs.org/stc/SA02930NY): Installation of Insight Instrument Corporation Graphic Engine Monitor (GEM 610C) models G3, G2, and G1 and 1200C model G4 as primary Cylinder Head Temperature (CHT), Exhaust Gas Temperature (EGT), and Turbine Inlet Temperature (TIT) Instruments. Insight Instrument Corporation - [STC SA02283SE PAGE 2](https://openairdocs.org/stc/SA02283SE%20PAGE%202): Installation of Electronics International Inc. Glass Panel Engine Monitor (with In Flight Data) CGR-30P. Electronics International Inc - [STC SA02402SE PAGE 1](https://openairdocs.org/stc/SA02402SE%20PAGE%201): Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data) CGR-30C. Electronics International Inc - [STC SA3-86](https://openairdocs.org/stc/SA3-86): RCA AVQ-50 radar antenna mount installation. Sabreliner Aviation LLC - [STC SA02825NY PAGE 1](https://openairdocs.org/stc/SA02825NY%20PAGE%201): Installation of Aerospace Logic Aircraft Instruments. Aerospace Logic Inc - [STC SA1315WE](https://openairdocs.org/stc/SA1315WE): Installation of Mixture Monitor (exhaust gas temperature probe, gage and selector) in accordance with Delta Products Part Lists A-192 and A-193, or in accordance with Tri-Star Corporation Mixture Monitor Installation Instructions dated December 9, 1981, or later FAA approved revision and/or Drawing List MM-127 dated November 15, 1981, or later FAA approved revision in aircraft models listed in Master Eligibility List P-80-A-6 revised March 29, 1968, copy attached, or later FAA approved revision. Universal Corporation - [STC SA02110CH](https://openairdocs.org/stc/SA02110CH): Installation of a Time Trac Data Recorder. P2 Incorporated - [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc - [STC SA174AL](https://openairdocs.org/stc/SA174AL): Installation of Stewart-Warner Model 940-F24 heater. Aircraft Innovations, LLC - [STC SA2-433](https://openairdocs.org/stc/SA2-433): Installation of a carburetor air induction system. BlackHawk Aircraft Maintenance Inc - [STC SA01988SE](https://openairdocs.org/stc/SA01988SE): Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data) MVP-50P. Electronics International Inc - [STC SA4-32](https://openairdocs.org/stc/SA4-32): Internal combustion heaters. Staggerwing Museum Foundation Inc - [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 SA1708WE](https://openairdocs.org/stc/SA1708WE): Removal of cargo door (approved under STC SA995WE) to permit aircraft to engage in special operations such as aerial photography, parachute jumping, etc. SOUTHWESTERN AERO EXCHANGE INC - [STC SA1512WE](https://openairdocs.org/stc/SA1512WE): Installation of exhaust gas temperature monitoring systems Model EGT-1. K S Avionics Inc - [STC SA2557NM](https://openairdocs.org/stc/SA2557NM): Installation of KS Avionics EGT/CHT-2( ) combined exhaust gas and cylinder head temperature monitoring system. K S Avionics Inc. Lists C18 Series - [STC SA138SO](https://openairdocs.org/stc/SA138SO): D18S landing gear 404-188400 on C18S. Staggerwing Museum Foundation Inc - [STC SA2-1016](https://openairdocs.org/stc/SA2-1016): Recertification under subparts B &G of CAR 3 and installation of SA4-120 airspeed system, SA4-21, fuel system, and SA-2-523, stabilizer angle of incidence change and elevator seal strips. Staggerwing Museum Foundation Inc - [STC SA2-1230](https://openairdocs.org/stc/SA2-1230): Installation of extended tail wheel assembly. Staggerwing Museum Foundation Inc - [STC SA2-1261](https://openairdocs.org/stc/SA2-1261): Install Fiberglas bubble tail wheel enclosure doors (enclosing entire wheel). Staggerwing Museum Foundation Inc - [STC SA2-204](https://openairdocs.org/stc/SA2-204): Installation of one-peice windshield and flush cockpit side-windows. Staggerwing Museum Foundation Inc - [STC SA2-213](https://openairdocs.org/stc/SA2-213): Installation of modified wing tips. Staggerwing Museum Foundation Inc - [STC SA2-328](https://openairdocs.org/stc/SA2-328): Installation of Hartzell propeller unfeathering crossfeed system. Staggerwing Museum Foundation Inc - [STC SA2-338](https://openairdocs.org/stc/SA2-338): Installation of two (2) 25,000 BTU Janitrol Heaters installed one (1) in each wheel well. Staggerwing Museum Foundation Inc - [STC SA2-523](https://openairdocs.org/stc/SA2-523): Revise horizontal stabilizer angle of incidence from -3.6 degrees to-0.5 degrees. Staggerwing Museum Foundation Inc - [STC SA249SO](https://openairdocs.org/stc/SA249SO): Increase in takeoff weight to10,200 lbs. and landing weight to9,800 lbs. and extension of aft C.G. limit to (+120.5) at 10,200 lbs. (Model may also be designated as Conrad 10,200.). Staggerwing Museum Foundation Inc - [STC SA24CE](https://openairdocs.org/stc/SA24CE): Oval passenger windows. Staggerwing Museum Foundation Inc - [STC SA3-383](https://openairdocs.org/stc/SA3-383): Beech D18S Goodyear wheels and brake assembly. Staggerwing Museum Foundation Inc - [STC SA3-732](https://openairdocs.org/stc/SA3-732): Full-view passenger window. Staggerwing Museum Foundation Inc - [STC SA4-120](https://openairdocs.org/stc/SA4-120): Dual airspeed system. Staggerwing Museum Foundation Inc - [STC SA4-128](https://openairdocs.org/stc/SA4-128): Engines, propellers, revised nacelles, wheel-well doors, air- speed system, fuel system and elevator seal strips. Staggerwing Museum Foundation Inc - [STC SA4-21](https://openairdocs.org/stc/SA4-21): Fuel system modified to provide dual wobble pumps and suction crossfeed and attendant plumbing. Staggerwing Museum Foundation Inc - [STC SA4-34](https://openairdocs.org/stc/SA4-34): Main landing gear door. Staggerwing Museum Foundation Inc - [STC SA53CE](https://openairdocs.org/stc/SA53CE): Stewart-Warner heater 940B/24 in fuselage. Staggerwing Museum Foundation Inc All 143: https://openairdocs.org/aircraft/N79MB/stcs.md ## Related - Other Beech C18S aircraft: https://openairdocs.org/model/beech-c18s/aircraft.md - The Pratt & Whitney R-985 series engine: https://openairdocs.org/engine/pratt-whitney-r-985-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.