# Rolls-Royce 250-C20C

- Type: Engine model (FAA registry)
- Registry code: 54179
- Manufacturer (registry): ROLLS-ROYC
- 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: 6 registered aircraft
- Page: https://openairdocs.org/engine/rolls-royce-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Historical (superseded or no longer in force):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 (6)

- [N2133K](https://openairdocs.org/aircraft/N2133K): [Bradford William F](https://openairdocs.org/faa-owner/BRADFORD%20WILLIAM%20F), [Independence, MO](https://openairdocs.org/faa-place/MO/Independence), built 1947, S/N 4860
- [N480FT](https://openairdocs.org/aircraft/N480FT): [Dillon Flight Test Inc](https://openairdocs.org/faa-owner/DILLON%20FLIGHT%20TEST%20INC), [Scottsdale, AZ](https://openairdocs.org/faa-place/AZ/Scottsdale), built 1970, S/N 70-15464
- [N595AF](https://openairdocs.org/aircraft/N595AF): [Blair Helicopter Service Inc](https://openairdocs.org/faa-owner/BLAIR%20HELICOPTER%20SERVICE%20INC), [Lemoore, CA](https://openairdocs.org/faa-place/CA/Lemoore), built 1971, S/N 71-20749
- [N598GY](https://openairdocs.org/aircraft/N598GY): [Aerial Defense Holdings LLC](https://openairdocs.org/faa-owner/AERIAL%20DEFENSE%20HOLDINGS%20LLC), [Kalispell, MT](https://openairdocs.org/faa-place/MT/Kalispell), built 1970, S/N 70-15598
- [N72269](https://openairdocs.org/aircraft/N72269): [Army Aviation Heritage Foundation](https://openairdocs.org/faa-owner/ARMY%20AVIATION%20HERITAGE%20FOUNDATION), [Hampton, GA](https://openairdocs.org/faa-place/GA/Hampton), built 1971, S/N 71-20541
- [N882KP](https://openairdocs.org/aircraft/N882KP): [J & S Aviation LLC](https://openairdocs.org/faa-owner/J%20%26%20S%20AVIATION%20LLC), [Chattanooga, TN](https://openairdocs.org/faa-place/TN/Chattanooga), built 1973, S/N 73-21882

## NTSB investigations (1)

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 WPR26LA328](https://openairdocs.org/ntsb/WPR26LA328), Sep 3, 2026: Bell OH-58A (N480FT), Phoenix, AZ, substantial damage, investigation ongoing

## FAA accident and incident reports (1)

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 20260903011919A](https://openairdocs.org/incident/20260903011919A), Sep 3, 2026: Bell OH-58A (N480FT), Phoenix, AZ, Substantial damage. PIC stated he and another pilot departed from Phoenix deer valley airport (dvt) to practice hovering autorotations. PIC completed one hovering autorotation…

## 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

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