# Allison 250-C20C - Type: Engine model (FAA registry) - Registry code: 03082 - Manufacturer (registry): ALLISON - Model: 250-C20C - Engine type: Turbo-shaft - Power: 420 hp - Data sheet: [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs) - Holder: Rolls-Royce Corporation - Installed in: 9 registered aircraft - Page: https://openairdocs.org/engine/allison-250-c20c 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. - [AD 2022-10-06](https://openairdocs.org/ad/2022-10-06): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20C (T63-A-720) and 9 more. Effective Jun 28, 2022 - [AD 2018-13-01](https://openairdocs.org/ad/2018-13-01): Turbine Governor · Rolls-Royce 250-C10 (T63-A-5), 250-C18, 250-C18A and 24 more. Effective Aug 16, 2018 - [AD 2006-16-04](https://openairdocs.org/ad/2006-16-04): Inspection of the fuel nozzle screen · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Sep 7, 2006 - [AD 98-24-28](https://openairdocs.org/ad/98-24-28): Main Fuel Control Bellows · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 36 more. Effective Jan 7, 1999 - [AD 88-17-01](https://openairdocs.org/ad/88-17-01): Fuel Controls · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 26 more. Effective Mar 1, 1989 - [AD 83-03-02 R1](https://openairdocs.org/ad/83-03-02-R1): Slotted Third Stage Turbine Wheels · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 5 more. Effective Feb 28, 1984 - [AD 82-24-05](https://openairdocs.org/ad/82-24-05): Control Assembly and Power Turbine Governor Assembly · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Nov 26, 1982 - [AD 79-21-01 R1](https://openairdocs.org/ad/79-21-01-R1): Third Stage Turbine Wheel Blade · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 3 more. Effective Jun 3, 1981 - [AD 77-15-12](https://openairdocs.org/ad/77-15-12): Power Turbine Coupling Nut · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 23 more. Effective Sep 23, 1977 - [AD 77-09-08](https://openairdocs.org/ad/77-09-08): Bleed Valve Diaphragm · Rolls-Royce 250-B17, 250-B17B, 250-C20 and 2 more. Effective Jul 18, 1977 Historical (superseded or no longer in force): - [AD 2004-24-09](https://openairdocs.org/ad/2004-24-09) (historical): Fuel nozzle · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 40 more. Effective Jan 5, 2005 ## Registered aircraft (9) - [N101SY](https://openairdocs.org/aircraft/N101SY): built 1970, S/N 201374 - [N183MP](https://openairdocs.org/aircraft/N183MP): [Air One Mobility Inc](https://openairdocs.org/faa-owner/AIR%20ONE%20MOBILITY%20INC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), S/N 71-20666 - [N441EA](https://openairdocs.org/aircraft/N441EA): [Edgefield Aviation LLC](https://openairdocs.org/faa-owner/EDGEFIELD%20AVIATION%20LLC), [Sandy, OR](https://openairdocs.org/faa-place/OR/Sandy), built 1972, S/N 71-20860 - [N581LR](https://openairdocs.org/aircraft/N581LR): [Burkeen Jeffrey D](https://openairdocs.org/faa-owner/BURKEEN%20JEFFREY%20D), [Doniphan, MO](https://openairdocs.org/faa-place/MO/Doniphan), built 1971, S/N 71-20565 - [N58XM](https://openairdocs.org/aircraft/N58XM): [S-Tec Corporation DBA](https://openairdocs.org/faa-owner/S-TEC%20CORPORATION%20DBA), [Mineral Wells, TX](https://openairdocs.org/faa-place/TX/Mineral%20Wells), built 1971, S/N 71-20810 - [N602WC](https://openairdocs.org/aircraft/N602WC): [Blair Helicopter Service Inc](https://openairdocs.org/faa-owner/BLAIR%20HELICOPTER%20SERVICE%20INC), [Lemoore, CA](https://openairdocs.org/faa-place/CA/Lemoore), built 1970, S/N 70-15633 - [N6246W](https://openairdocs.org/aircraft/N6246W): [Starfire Aviation LLC](https://openairdocs.org/faa-owner/STARFIRE%20AVIATION%20LLC), [Renton, WA](https://openairdocs.org/faa-place/WA/Renton), built 1968, S/N 880712 - [N656EA](https://openairdocs.org/aircraft/N656EA): [Edgefield Aviation LLC](https://openairdocs.org/faa-owner/EDGEFIELD%20AVIATION%20LLC), [Sandy, OR](https://openairdocs.org/faa-place/OR/Sandy), built 1973, S/N 73-21911 - [N901PD](https://openairdocs.org/aircraft/N901PD): [Blair Helicopter Service Inc](https://openairdocs.org/faa-owner/BLAIR%20HELICOPTER%20SERVICE%20INC), [Lemoore, CA](https://openairdocs.org/faa-place/CA/Lemoore), built 1972, S/N 72-21124 ## 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 ERA20CA184](https://openairdocs.org/ntsb/ERA20CA184), May 14, 2020: Bell OH-58C (N183MP), Livingston, NY, substantial damage. Probable cause: The pilot's failure to maintain obstacle clearance while maneuvering at low altitude at night, which resulted in the helicopter striking a tree. - [NTSB CEN15LA002](https://openairdocs.org/ntsb/CEN15LA002), Oct 2, 2014: Bell 206B (N49746), Woodsboro, TX, substantial damage. Probable cause: The pilot’s failure to recognize and correct for flight conditions conducive to a loss of tail rotor effectiveness, which resulted in a rapid, uncommanded right yaw and subsequent hard landing. - [NTSB FTW81DRA33](https://openairdocs.org/ntsb/FTW81DRA33), May 19, 1981: Bell 206B (N49746), Gulf Of Mexico (Atlantic Ocean), substantial damage ## FAA accident and incident reports (3) 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 20200514006229A](https://openairdocs.org/incident/20200514006229A), May 14, 2020: Bell OH-58C (N183MP), Livingston, NY, Substantial damage. On 05-14-2020 at approximately 03:30 am EST, while en-route to its destination in the town of Livingston, new york, a Bell OH-58C helicopter N183MP S/N71-20666… - [Accident 20141002023339A](https://openairdocs.org/incident/20141002023339A), Oct 2, 2014: Bell 206B (N49746), Refugio, TX, Substantial damage. Aircraft was heavely loaded while performing pipeline patrol. Suspect power loss with aircraft positioned over some power tranmission lines, pilot was unable… - [Accident 19810519026869A](https://openairdocs.org/incident/19810519026869A), May 19, 1981: Bell 206B (N49746), Metagorda 526l, TX, Substantial damage. Tried to take off with skids tied down. Helicopter fell off helipad onto lower deck. Tie-down not flagged. ## Service difficulty reports (5) As reported by operators and repair stations, by the model named in the report. - [SDR IAVA2014061100002](https://openairdocs.org/sdr/IAVA2014061100002), Jun 5, 2014: COMBUSTION CASE. CRACKED. RIGHT HAND ELBOW LEAKING AIR IN WELD AREA WHERE FLANGE ATTACHES TO COMBUSTION CASE. - [SDR 2008FA0000854](https://openairdocs.org/sdr/2008FA0000854), Dec 1, 2008: SPUR GEAR. BROKEN. GAS PRODUCER TRAIN IDLER SPUR GEARSHAFT PN: 23038229. SHEARED IN HALF, PRODUCING METAL IN OIL. WHEN TECHNICIAN DISASSEMBLED GEARBOX FOUND THAT GEARSHAFT WAS THE - [SDR CA050831002](https://openairdocs.org/sdr/CA050831002), Aug 3, 2005: BLADE. CRACKED. (CAN) DURING PILOT'S POST FLIGHT INSPECTION A CRACK WAS DETECTED IN THE LOWER SKIN OF MAIN ROTOR BLADE NR 1. THE CRACK IS LOCATED 11' FROM THE INBOARD END (ROOT - [SDR 20010208CW006](https://openairdocs.org/sdr/20010208CW006), Dec 28, 2000: HARNESS. SHORTED. SPARKS EMITTING FROM THE LEFT SIDE OF THE CENTER CONSOLE. FOUND BAD WIRE SPLICE ON FF40 FM RADIO WIRING PROVISIONS. - [SDR 20000622SH012](https://openairdocs.org/sdr/20000622SH012), Feb 1, 2000: GEAR SHAFT. SHEARED. ENGINE WAS REMOVED FROM AIRCRAFT BECAUSE IT WAS GENERATING METAL IN THE OIL. AFTER DISASSEMBLY, IT WAS VIEWED THAT THE GEAR SHAFT IN QUESTION HAD SHEARED. THE S ## STCs that may be installed (OpenAirDocs) (3) 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 SE5511NM](https://openairdocs.org/stc/SE5511NM): Installation of compressor discharge pressue (PC) valve. Bell Helicopter Textron Inc - [STC SE00027EN](https://openairdocs.org/stc/SE00027EN): Installation of Pratt & Whitney Engine Services Inc. Intellistart plus electronic control unit (ECU), P/N DPU-K-010 on the specified 250 engine models. Pratt & Whitney Engine Services Inc - [STC ST00037AT](https://openairdocs.org/stc/ST00037AT): Unison igniter plugs, P/N 9044400-1. Unison Industries --- 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.