# Allison T63-A-720 - Type: Engine model (FAA registry) - Registry code: 03083 - Manufacturer (registry): ALLISON - Model: T63-A-720 - Engine type: Turbo-shaft - Power: 420 hp - Installed in: 23 registered aircraft - Page: https://openairdocs.org/engine/allison-t63-a-720 Model codes come from the FAA registry's reference file. ## 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. None matched. ## Registered aircraft (23) - [N115SR](https://openairdocs.org/aircraft/N115SR): [Central States Helicopters Inc](https://openairdocs.org/faa-owner/CENTRAL%20STATES%20HELICOPTERS%20INC), [Wood River, NE](https://openairdocs.org/faa-place/NE/Wood%20River), built 1972, S/N 72-21423 - [N158GS](https://openairdocs.org/aircraft/N158GS): [Sunny Sky LLC](https://openairdocs.org/faa-owner/SUNNY%20SKY%20LLC), [Stacyville, IA](https://openairdocs.org/faa-place/IA/Stacyville), built 1968, S/N 68-16742 - [N170FR](https://openairdocs.org/aircraft/N170FR): [National Test Pilot School](https://openairdocs.org/faa-owner/NATIONAL%20TEST%20PILOT%20SCHOOL), [Mojave, CA](https://openairdocs.org/faa-place/CA/Mojave), built 2000, S/N FRI 001 - [N17167](https://openairdocs.org/aircraft/N17167): [Slade Aviation LLC](https://openairdocs.org/faa-owner/SLADE%20AVIATION%20LLC), [Carlsbad, NM](https://openairdocs.org/faa-place/NM/Carlsbad), built 1969, S/N 491127 - [N1851D](https://openairdocs.org/aircraft/N1851D): [Morten Jesse L](https://openairdocs.org/faa-owner/MORTEN%20JESSE%20L), [Larimore, ND](https://openairdocs.org/faa-place/ND/Larimore), built 1972, S/N 72-21080 - [N206PW](https://openairdocs.org/aircraft/N206PW): [Bank Of Utah Trustee](https://openairdocs.org/faa-owner/BANK%20OF%20UTAH%20TRUSTEE), [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City), built 1972, S/N 72-21389 - [N223MF](https://openairdocs.org/aircraft/N223MF): [Momentum Foundation](https://openairdocs.org/faa-owner/MOMENTUM%20FOUNDATION), [Tullahoma, TN](https://openairdocs.org/faa-place/TN/Tullahoma), built 1970, S/N 70-15260 - [N230FW](https://openairdocs.org/aircraft/N230FW): [Coastal Air Service Inc](https://openairdocs.org/faa-owner/COASTAL%20AIR%20SERVICE%20INC), [Panama City, FL](https://openairdocs.org/faa-place/FL/Panama%20City), built 1970, S/N 70-15649 - [N232FW](https://openairdocs.org/aircraft/N232FW): [Coastal Air Service Inc](https://openairdocs.org/faa-owner/COASTAL%20AIR%20SERVICE%20INC), [Panama City, FL](https://openairdocs.org/faa-place/FL/Panama%20City), built 1968, S/N 68-16858 - [N238FW](https://openairdocs.org/aircraft/N238FW): [Southern Helicopter Inc](https://openairdocs.org/faa-owner/SOUTHERN%20HELICOPTER%20INC), [O Brien, FL](https://openairdocs.org/faa-place/FL/O%20Brien), built 1970, S/N 70-15223 - [N338SP](https://openairdocs.org/aircraft/N338SP): [Rgrat LLC](https://openairdocs.org/faa-owner/RGRAT%20LLC), [Fountain Hills, AZ](https://openairdocs.org/faa-place/AZ/Fountain%20Hills), built 1971, S/N 71-20583 - [N369AH](https://openairdocs.org/aircraft/N369AH): [Never Forget Flight Foundation](https://openairdocs.org/faa-owner/NEVER%20FORGET%20FLIGHT%20FOUNDATION), [Santa Teresa, NM](https://openairdocs.org/faa-place/NM/Santa%20Teresa), built 2014, S/N 1294 - [N391LC](https://openairdocs.org/aircraft/N391LC): [Rc Aviation Inc](https://openairdocs.org/faa-owner/RC%20AVIATION%20INC), [Lumpkin, GA](https://openairdocs.org/faa-place/GA/Lumpkin), built 1971, S/N 71-20535 - [N420SX](https://openairdocs.org/aircraft/N420SX): [Mancini Geno F](https://openairdocs.org/faa-owner/MANCINI%20GENO%20F), [Mountain Iron, MN](https://openairdocs.org/faa-place/MN/Mountain%20Iron), built 2017, S/N 8102 - [N552EA](https://openairdocs.org/aircraft/N552EA): [Edgefield Aviation LLC](https://openairdocs.org/faa-owner/EDGEFIELD%20AVIATION%20LLC), [Sandy, OR](https://openairdocs.org/faa-place/OR/Sandy), built 2025, S/N 68-16835 - [N59516](https://openairdocs.org/aircraft/N59516): [Custom Air-Montana LLC](https://openairdocs.org/faa-owner/CUSTOM%20AIR-MONTANA%20LLC), [Missoula, MT](https://openairdocs.org/faa-place/MT/Missoula), built 1970, S/N 70-15516 - [N615NS](https://openairdocs.org/aircraft/N615NS): [Ewing Flying Service LLC](https://openairdocs.org/faa-owner/EWING%20FLYING%20SERVICE%20LLC), [Morganza, LA](https://openairdocs.org/faa-place/LA/Morganza), S/N 71-20615 - [N653HA](https://openairdocs.org/aircraft/N653HA): [Helicopter Applicators Inc](https://openairdocs.org/faa-owner/HELICOPTER%20APPLICATORS%20INC), [Gettysburg, PA](https://openairdocs.org/faa-place/PA/Gettysburg), built 1971, S/N 71-20341 - [N657EA](https://openairdocs.org/aircraft/N657EA): [Edgefield Aviation LLC](https://openairdocs.org/faa-owner/EDGEFIELD%20AVIATION%20LLC), [Sandy, OR](https://openairdocs.org/faa-place/OR/Sandy), built 2025, S/N 68-16789 - [N72BM](https://openairdocs.org/aircraft/N72BM): [Vertical Vegetation Management LLC](https://openairdocs.org/faa-owner/VERTICAL%20VEGETATION%20MANAGEMENT%20LLC), [Darlington, IN](https://openairdocs.org/faa-place/IN/Darlington), built 1972, S/N 72-21248 - [N901XV](https://openairdocs.org/aircraft/N901XV): [Fernandez Rosario Yailin](https://openairdocs.org/faa-owner/FERNANDEZ%20ROSARIO%20YAILIN), [Imperial, CA](https://openairdocs.org/faa-place/CA/Imperial), built 2006, S/N 69-16273 - [N911A](https://openairdocs.org/aircraft/N911A): [Heligray LLC](https://openairdocs.org/faa-owner/HELIGRAY%20LLC), [Kalispell, MT](https://openairdocs.org/faa-place/MT/Kalispell), built 1972, S/N 72-21424 - [N992YC](https://openairdocs.org/aircraft/N992YC): [Bank Of Utah Trustee](https://openairdocs.org/faa-owner/BANK%20OF%20UTAH%20TRUSTEE), [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City), built 1971, S/N 71-20617 ## NTSB investigations (6) 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 ERA24LA267](https://openairdocs.org/ntsb/ERA24LA267), Jun 18, 2024: Garlick Helicopters OH-58A+ (N72BM), Cisco, GA, substantial damage. Probable cause: A reported total loss of engine power for reasons that could not be determined. - [NTSB WPR20LA247](https://openairdocs.org/ntsb/WPR20LA247), Jul 31, 2020: Bell OH58A (N901XV), Holtville, CA, substantial damage. Probable cause: The total loss of engine power due to the decoupling of the engine's turbine and compressor sections, which resulted from improper maintenance. - [NTSB GAA17CA265](https://openairdocs.org/ntsb/GAA17CA265), May 7, 2017: Rotorcraft Development OH-58A+ (N993YC), Waterloo, IL, substantial damage. Probable cause: The pilot’s failure to see and avoid transmission wires while maneuvering at a low altitude. - [NTSB WPR13LA087](https://openairdocs.org/ntsb/WPR13LA087), Jan 8, 2013: Bell OH-58C (N911PT), Riverdale, CA, substantial damage. Probable cause: A flight control malfunction while maneuvering for reasons that could not be determined because it was not possible to establish whether observed damage to the flight control assembly was the result… - [NTSB WPR11LA303](https://openairdocs.org/ntsb/WPR11LA303), Jul 3, 2011: Arrow Falcon Exporters OH-58C (N6264D), Brentwood, CA, substantial damage. Probable cause: The failure of the main rotor mast due to fatigue cracking originating from corrosion pits. - [NTSB WPR09LA471](https://openairdocs.org/ntsb/WPR09LA471), Sep 28, 2009: Arrow Falcon Exporters OH-58A+ (N298CP), Myrtle Creek, OR, substantial damage. Probable cause: A partial loss of engine power during takeoff for undetermined reasons. ## FAA accident and incident reports (8) 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 20240618021919A](https://openairdocs.org/incident/20240618021919A), Jun 18, 2024: Garlick Helicopters Inc OH-58A+ (N72BM), Crandell, GA, Substantial damage. On approach to the area to be sprayed with the agricultural liquid the aircraft began to lose power and rotor RPM resulting in an emergency landing that… - [Accident 20200730011579A](https://openairdocs.org/incident/20200730011579A), Jul 30, 2020: Arrow Falcon Exporters Inc OH-58A+ (N901XV), Holtville, CA, Substantial damage. On 7/30/2020 at approximately 2100 PDT, the pilot claims that engine power was lost while nearly complete with a 180 degree turn back (a turn from the north to… - [Accident 20170507008699A](https://openairdocs.org/incident/20170507008699A), May 7, 2017: Rotorcraft Development Corp OH-58A+ (N993YC), Waterloo, IL, Destroyed. On may 07, 2017 at approximately 1450CST OH-58A+ helicopter, N993YC contacted power lines while performing aerial spraying operations which caused the pilot to… - [Accident 20130108000529A](https://openairdocs.org/incident/20130108000529A), Jan 8, 2013: Bell OH-58C (N911PT), Lemoore, CA, Substantial damage. Pilot was spraying fields when he noticed in a turn that he could no longer turn the aircraft to the left by use of his cyclic. Pilot used pedals to turn… - [Incident 20120724015629I](https://openairdocs.org/incident/20120724015629I), Jul 24, 2012: Garlick Helicopters Inc OH-58C (N8092J), Waukon, IA, Minor damage. The airman was conducting aerial application of chemical to a corn field. The airman stated that during his aerial survey of the field prior to the application… - [Accident 20110703013749A](https://openairdocs.org/incident/20110703013749A), Jul 3, 2011: Arrow Falcon Exporters Inc OH-58C (N6264D), Brentwood, CA, Substantial damage. Aircraft sustained substantial damage when it impacted terrain during agricultural aerial dispensing operations. Pilot stated he heard a loud noise before… - [Accident 20090927019969A](https://openairdocs.org/incident/20090927019969A), Sep 27, 2009: Arrowf OH58A (N298CP), Roseburg, OR, Substantial damage. Pilot reports departing from hill top with empty spray tanks to survey area to be sprayed that night when shortly after takeoff he heard a "repetitive popping… - [Incident 19780103000759I](https://openairdocs.org/incident/19780103000759I), Jan 3, 1978: Bell 206B (N59516), White Lake, LA. Forced landing after power loss. Found loose fuel line. ## Service difficulty reports (10) As reported by operators and repair stations, by the model named in the report. - [SDR 2012FA0000185](https://openairdocs.org/sdr/2012FA0000185), Feb 10, 2012: MAST. BROKEN. ACFT LANDED ON LOAD TRUCK. ACFT RECEIVED FUEL AND LOAD. PILOT FELT VIBRATION AND SHUTDOWN ACFT AND FOUND MAST POLE BROKEN. - [SDR 2010FA0000730](https://openairdocs.org/sdr/2010FA0000730), Jul 7, 2010: GEAR. FRACTURED. ( YKER) ENGINE WAS SENT FOR REPAIR DUE TO GENERATING METAL. UPON DISASSEMBLY, FOUND THAT THE SHAFT ON THE GEAR HAD FRACTURED APPROX 2.325 IN FROM THE FWD END OF - [SDR 2009FA0000661](https://openairdocs.org/sdr/2009FA0000661), Aug 3, 2009: GEARSHAFT. BROKEN. GEARSHAFT BROKE IN HALF CAUSING A CHIP LIGHT. - [SDR 2008FA0000909](https://openairdocs.org/sdr/2008FA0000909), Aug 25, 2008: SEPARATOR. BROKEN. CUSTOMER HAD CHIP LIGHT INDICATING METAL GENERATION IN ENG. INVESTIGATION/ DISASSEMBLY REVEALED THE AIR OIL SEPARATOR GEAR WAS BROKEN AT GEARFACE TO SHAFT LOCAT - [SDR 2008FA0000384](https://openairdocs.org/sdr/2008FA0000384), May 19, 2008: GEAR. BROKEN. PILOT REPORTED ENGINE CHIP LIGHTS ON TAKEOFF. ABORTED MISSION AND RETURNED TO HELIPAD. ENG WAS REMOVED AND SENT FOR INVESTIGATION. ENG RECEIVED FOR REPAIR DUE T - [SDR A101913](https://openairdocs.org/sdr/A101913), Jun 12, 2007: GEAR. FRACTURED. ENGINE WAS SENT FOR REPAIR DUE TO GENERATING METAL. UPON DISASSEMBLY FOUND THAT THE SHAFT ON THE FORWARD SIDE OF THE CENTRIFUGAL BREATHER GEAR WAS FRACTURED IN - [SDR A1019131](https://openairdocs.org/sdr/A1019131), Jun 12, 2007: GEAR SHAFT. FRACTURED. ENGINE WAS SENT FOR REPAIR DUE TO GENERATING METAL. UPON DISASSEMBLY FOUND THAT THE SHAFT ON THE FORWARD SIDE OF THE CENTRIFUGAL BREATHER GEAR WAS FRACTURED IN - [SDR CA040311006](https://openairdocs.org/sdr/CA040311006), Mar 2, 2004: SEPARATOR. SHEARED. (CAN) ON DISASSEMBLY OF THE GEARBOX ASSEMBLY, THE AIR OIL SEPARATOR GEAR SHAFT WAS FOUND SHEARED AT THE JUNCTION OF GEAR AND SHAFT. THE ENGINE WAS SENT TO THE S - [SDR 2003F00512](https://openairdocs.org/sdr/2003F00512), Jul 2, 2003: FITTING. CRACKED. FOUND CRACK RADIATING FROM TOP AFT MOUNTING HOLE TO TRAILING EDGE. APPROX 1 INCH IN LENGTH. MILITARY BULLENTIN NR OH-58-03-ASAM-06 ADDRESSES A PROBLEM THE ARMY - [SDR 98ZZZX3814](https://openairdocs.org/sdr/98ZZZX3814), Sep 14, 1998: CASE HALVES. DAMAGED. LINER FLAKING - REMOVED AND REPLACED. --- 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.