# Mckinnon G21G - Type: Aircraft model (FAA registry) - Registry code: 5550120 - Manufacturer (registry): MCKINNON - Model: G21G - Aircraft type: Fixed wing multi engine - Category: Airplane - Engines: 2 · Turbo-prop - Seats: 8 - Weight class: Up to 12,499 lb - Cruise speed: 158 mph - Certification: Type certificated - Data sheet: [TCDS 4A24](https://openairdocs.org/tcds/4A24) (OpenAirDocs) - Holder: Atlantic Coast Seaplanes LLC - Registered aircraft: 2 - Page: https://openairdocs.org/model/mckinnon-g21g Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker. ## ADs that may apply (OpenAirDocs) Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 73-07-05](https://openairdocs.org/ad/73-07-05): Elevator or Rudder Torque Tube Assys · Atlantic Coast Seaplanes G-21C, G-21D, G-21E and 1 more ## Registered aircraft (2) - [N70AL](https://openairdocs.org/aircraft/N70AL): [Killa Katchka Inc](https://openairdocs.org/faa-owner/KILLA%20KATCHKA%20INC), [West Bloomfield, MI](https://openairdocs.org/faa-place/MI/West%20Bloomfield), built 1970, S/N 1226 - [N77AQ](https://openairdocs.org/aircraft/N77AQ): [Aeroplanes LLC](https://openairdocs.org/faa-owner/AEROPLANES%20LLC), [Livingston, MT](https://openairdocs.org/faa-place/MT/Livingston), S/N 1205 ## NTSB investigations (3) 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 DCA11WA032](https://openairdocs.org/ntsb/DCA11WA032), Feb 27, 2011: Grumman G21 (N221AG), Al Ain, United Arab Emirates, destroyed, 4 fatal - [NTSB ANC96FAMS1](https://openairdocs.org/ntsb/ANC96FAMS1), Aug 12, 1996: Grumman G21-G (N660PA), Dutch Harbor, AK, destroyed, 2 fatal. Probable cause: Undetermined. - [NTSB CHI88LA166](https://openairdocs.org/ntsb/CHI88LA166), Jul 13, 1988: Gulfstream Aerospace G-21-G (N77AQ), Elyria, OH, substantial damage ## FAA accident and incident reports (2) 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 19960811029909A](https://openairdocs.org/incident/19960811029909A), Aug 11, 1996: Mckinn G21G (N660PA), Dutch Habor, AK, Destroyed, 2 fatal. Amphibious twin became missing. Low ceilings in area. Not found. Presume crashed and person on board fatal. - [Accident 19880713026989A](https://openairdocs.org/incident/19880713026989A), Jul 13, 1988: Mckinn G21G (N77AQ), Elyria, OH, Substantial damage. Ground looped the amphibian on landing roll. Found brakes worn out and had mismatched brake pads. Poor maintenance. ## Service difficulty reports (1) As reported by operators and repair stations, by the model named in the report. - [SDR CA100817002](https://openairdocs.org/sdr/CA100817002), Aug 2, 2010: ENGINE. FAILED. DURING REVENUE FLIGHT, ENGINE WAS MAKING AN UNUSUAL NOISE ON APPROACH. THE NOISE FOLLOWED POWER LEVER MOVEMENTS AND PARAMETERS SHIFTED NOTICEABLY UPWARD. ENGINE ## STCs that may be installed (OpenAirDocs) (28) Approved for this 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 SA02571SE](https://openairdocs.org/stc/SA02571SE): Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display). Garmin International Inc - [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 SA02019SE-D](https://openairdocs.org/stc/SA02019SE-D): Installation of Garmin Model GTN 625/635/650; 725/750 Navigation System. Garmin International Inc - [STC SA02658SE](https://openairdocs.org/stc/SA02658SE): Installation of Garmin GI 275 Multi-Function Display System. Garmin International Inc - [STC SA04776NY](https://openairdocs.org/stc/SA04776NY): The HIPEC Covering and Finishing System must be performed and maintained. HIPEC Aircraft Coatings Inc - [STC SA02444AK](https://openairdocs.org/stc/SA02444AK): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed. ADS-B Technologies LLC - [STC SA01714WI](https://openairdocs.org/stc/SA01714WI): Installation of a Garmin transponders: (a) GTX 330/330D/33/33D with ADS-B Out functionality; (b) GTX 335/335R/345/345R with ADS-B Out and In functionality; or (c) GTX 335R/345R with ADS-B Out functionality in select airplanes installed with G950/G1000 systems. Garmin International 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 SA02632SE](https://openairdocs.org/stc/SA02632SE): Installation of a Pratt and Whitney PT6A-35 engine flat rated to existing horsepower of the original Pratt and Whitney PT6A-28 and associated instrument marking changes. Teufel Nursery Inc - [STC SA02153LA-D PAGE 1](https://openairdocs.org/stc/SA02153LA-D%20PAGE%201): Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System. Garmin International Inc - [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 SA00382BO](https://openairdocs.org/stc/SA00382BO): Installation of Globalstar Antenna and Cradle provisions to support a Globalstar GPS-1700 in non-composite airplanes. Avidyne Corporation - [STC SA00343BO](https://openairdocs.org/stc/SA00343BO): Installation of a single configuration or a dual configuration Avidyne Corporation Integrated Flight Display, Model IFD540 loaded with Release 10.0 software (or later FAA approved release). Avidyne Corporation - [STC SA00352BO PAGE 1](https://openairdocs.org/stc/SA00352BO%20PAGE%201): Installation of an Avidyne Corporation Mode A/C/S Transponder with ADS-B Out capability, Model AXP340 loaded with Version 3.13 software (or later FAA approved version),. Avidyne Corporation - [STC SA01734SE](https://openairdocs.org/stc/SA01734SE): Application of Stewart Systems synthetic fabric covering system to aircraft fuselage, wings, tail surfaces, control surfaces and related parts. Andrew D. Humphrey - [STC SA02119SE PAGE 1](https://openairdocs.org/stc/SA02119SE%20PAGE%201): Installation of Garmin GDL 88 ADS-B UAT Transceiver System. Garmin International Inc - [STC SA02121SE](https://openairdocs.org/stc/SA02121SE): Installation of Garmin GTS 825 (TAS) or GTS 855 (TCAS I) Traffic System. Garmin International Inc - [STC ST02540AT-D](https://openairdocs.org/stc/ST02540AT-D): Installation of replacement fuel tank sealant system. FFC Manufacturing - [STC SP00400SE](https://openairdocs.org/stc/SP00400SE): Installation of various propeller electrical de-icer models. SMR Technologies - [STC SA01606SE](https://openairdocs.org/stc/SA01606SE): Installation of an electrical/electronics system including contemporary electronic appliances, control devices and interface wiring in accordance with Teufel Nursery, Inc. MDL G21G-00006-01, Revision -1, dated August 12, 2005 or later approved MDL on Aero Planes, LLC, Model G-21G, s/n 1201. Teufel Nursery Inc - [STC SA8075SW](https://openairdocs.org/stc/SA8075SW): Installation of fiberglass covering. (M-62 SERIES PT-19) (G-73 SCHWEIZER). Razorback Fabrics Inc - [STC SA1008WE](https://openairdocs.org/stc/SA1008WE): Installation of Poly-Fiber covering material. Poly-Fiber Inc - [STC SA02168AK](https://openairdocs.org/stc/SA02168AK): Installation of hourmeter airspeed switch. For unpressurized aircraft only. Pressurized aircraft must have pressurization system deactivated. Avalaska Inc - [STC SA812NE](https://openairdocs.org/stc/SA812NE): Installation of BF Goodrich Model 6975-1 De-Icer kit or BF Goodrich Model 6975-10 De-Icer kit. BF Goodrich Aerospace - [STC SA3494SW-D](https://openairdocs.org/stc/SA3494SW-D): Installation of a century automatic flight system. Century Flight Systems Inc - [STC SA1351WE](https://openairdocs.org/stc/SA1351WE): Replace existing fabric on wings, fuselage, empennage, and/or control surfaces, with Ceconite101 material. (262A Series -12). Ceconite Inc - [STC SA2809WE](https://openairdocs.org/stc/SA2809WE): Installation of AiResearch TPE331-2UA-203D engines, increase in fuselage length. McKinnon Enterprises Inc - [STC SA02153LA-D](https://openairdocs.org/stc/SA02153LA-D) (historical): Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System. Garmin International Inc ## The same model under other registry codes Amateur-built copies and renamed makers get their own codes. - [Grumman/Mckinnon Enterprises G21G](https://openairdocs.org/model/grumman-mckinnon-enterprises-g21g): 1 registered aircraft, registry code 395069H --- 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.