Allison (Rolls-Royce) 250-C20 series
530 aircraft on the U.S. register carry an Allison (Rolls-Royce) 250-C20 series engine, rated at about 420 horsepower. The Bell 206 JetRanger and LongRanger is the model most often fitted with it (324 aircraft). The aircraft carrying it were built between 1967 and 2021.
The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Allison (Rolls-Royce) 250-C20 series. FAA spelling: 250-C20 SER.
Fitted to model families
Bell 206 JetRanger and LongRanger324Hughes Helicopters Inc HUGHES 36941Mcdonnell Douglas Helicopter 36941Hughes Helicopters Inc 36917Agusta Spa A10917Mcdonnell Douglas Helicopter 50014Hughes 369 500 series helicopters12Bell 40711Aerospatiale AS-35510Bell OH-587Md Helicopters Inc 5006Md Helicopters Inc 3695
Bell 206 JetRanger and LongRanger · Hughes Helicopters Inc HUGHES 369 · Mcdonnell Douglas Helicopter 369 · Hughes Helicopters Inc 369 · Agusta Spa A109 · Mcdonnell Douglas Helicopter 500 · Hughes 369 500 series helicopters · Bell 407 · Aerospatiale AS-355 · Bell OH-58
Where they are owner's state
Delaware55California48Florida43Texas27Oregon26Utah22Arizona20Washington15Montana15Alaska15
Kind of aircraft
Helicopters529 (100%)Turboprops1 (0.2%)
When the aircraft were built by decade
What the FAA has certified, ordered and been told about the Allison (Rolls-Royce) 250-C20 series the component layer
The design is held under 2 type certificates. No FAA order in the current files names this engine series. Operators and repair shops have filed 747 failure reports with the FAA since 1995, 8 of them in the last ten years.
Failure reports 747 since · what operators and shops told the FAA
Parts most often reported as the reports name them
Engine34Bearing27Nozzle27Gearshaft26Seal20Fuel Control18Bleed Valve16Connector15Turbine Wheel13Blade12
Latest reports
2026-06-11Oil System: low pressure
2025-11-08Blade: failed
2025-04-15Compressor: damaged
2021-09-04Indication Sys: reads high
2019-07-18Shaft: cracked
Certificates and bulletins
E4CEType certificate held by Allison Engine Company INC. · 21 models listed · revised July 1, 1997
E10CEType certificate held by Allison Engine Company INC. · 11 models listed · revised October 31, 1994
Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.
Connections how this engine series links to the rest of the register
Fitted to
- Bell 206 JetRanger and LongRanger 324 with this engine series
- Hughes Helicopters Inc HUGHES 369 41 with this engine series
- Mcdonnell Douglas Helicopter 369 41 with this engine series
- Hughes Helicopters Inc 369 17 with this engine series
- Agusta Spa A109 17 with this engine series
- Mcdonnell Douglas Helicopter 500 14 with this engine series
- Hughes 369 500 series helicopters 12 with this engine series
- Bell 407 11 with this engine series
Where they are
- Delaware 55 of these aircraft
- California 48 of these aircraft
- Florida 43 of these aircraft
- Texas 27 of these aircraft
- Oregon 26 of these aircraft
Biggest operators
- Helicopters INC 12 of these aircraft
- Brown Helicopter INC 9 of these aircraft
- United States Army 6 of these aircraft
- Bank Of Utah Trustee 6 of these aircraft
- Usda Aphis Ws 5 of these aircraft
Airworthiness
- Failure reports on the Allison (Rolls-Royce) 250-C20 series 747 reports since 1995
Analytics
These connections as data: /graph/engine/allison-rolls-royce-250-c20-series.json · about the eFlight graph.
Aircraft newest certificates first · 530
| Tail no. | Maker and model | Group | Owner and base | Certificate | Registered | Status |
|---|---|---|---|---|---|---|
| N297E | Hughes Helicopters Inc 369E |
Rotorcraft | County of Kern Bakersfield, California |
Standard | 1993-08-16 | ValidFAA registration status code V: Valid registration. All codes |
| N152CA | Bell 206B |
Rotorcraft | Chem Air LLC Shreveport, Louisiana |
Restricted | 1993-05-13 | ValidFAA registration status code V: Valid registration. All codes |
| N2995W | Bell 206B |
Rotorcraft | Scotts Helicopter Services INC Le Sueur, Minnesota |
Multiple | 1993-05-13 | ValidFAA registration status code V: Valid registration. All codes |
| N97PH | Bell 206B |
Rotorcraft | Provine Helicopter Service INC Greenwood, Mississippi |
Standard | 1993-04-08 | ValidFAA registration status code V: Valid registration. All codes |
| N4088Y | Bell 206B |
Rotorcraft | Dumont Associates Morris Plains, New Jersey |
Standard | 1993-02-12 | ValidFAA registration status code V: Valid registration. All codes |
| N164K | Bell 206B |
Rotorcraft | Memphis Police Department Memphis, Tennessee |
Standard | 1992-07-31 | ValidFAA registration status code V: Valid registration. All codes |
| N8372F | Mcdonnell Douglas Helicopter 369E |
Rotorcraft | City of Houston Police Department Houston, Texas |
Standard | 1991-12-24 | ValidFAA registration status code V: Valid registration. All codes |
| N10KX | Bell 206B |
Rotorcraft | Whirly Leasing INC Richvale, California |
Standard | 1991-12-17 | ValidFAA registration status code V: Valid registration. All codes |
| N43MA | Bell 206B-III |
Rotorcraft | Minuteman Aviation INC Missoula, Montana |
Standard | 1991-04-09 | ValidFAA registration status code V: Valid registration. All codes |
| N221TG | Hughes Helicopters Inc HUGHES 369D |
Rotorcraft | Collier Mosquito Control District Naples, Florida |
Standard | 1990-08-15 | ValidFAA registration status code V: Valid registration. All codes |
| N109US | Bell 206B |
Rotorcraft | U S Helicopters INC Marshville, North Carolina |
Standard | 1989-08-31 | ValidFAA registration status code V: Valid registration. All codes |
| N39049 | Bell 206B |
Rotorcraft | Aspen Helicopters INC Oxnard, California |
Multiple | 1989-08-31 | ValidFAA registration status code V: Valid registration. All codes |
| N50141 | Bell 206B-III |
Rotorcraft | Greenwood Helicopters INC Washington, North Carolina |
Restricted | 1989-04-03 | ValidFAA registration status code V: Valid registration. All codes |
| N75CW | Bell 206B |
Rotorcraft | Chem Air LLC Shreveport, Louisiana |
Restricted | 1988-07-15 | ValidFAA registration status code V: Valid registration. All codes |
| N59427 | Bell 206B |
Rotorcraft | Ambrosini Helicopters INC Fresno, California |
Restricted | 1988-06-25 | ValidFAA registration status code V: Valid registration. All codes |
| N64JB | Bell 206B |
Rotorcraft | Nc Transportation INC Loudon, New Hampshire |
Multiple | 1988-04-05 | ValidFAA registration status code V: Valid registration. All codes |
| N21MW | Bell 206B |
Rotorcraft | Air Flite INC Shawnee, Oklahoma |
Standard | 1987-11-07 | ValidFAA registration status code V: Valid registration. All codes |
| N316RC | Bell 206B |
Rotorcraft | Helicopter Emergency Lift Program Pomona, New York |
Standard | 1986-10-14 | ValidFAA registration status code V: Valid registration. All codes |
| N3188Z | Bell 206B |
Rotorcraft | Fulton County Police Headquarters Atlanta, Georgia |
Standard | 1985-10-15 | ValidFAA registration status code V: Valid registration. All codes |
| N206BE | Bell 206B |
Rotorcraft | Summit Helicopters INC Salem, Virginia |
Standard | 1985-06-28 | ValidFAA registration status code V: Valid registration. All codes |
| N911CP | Hughes Helicopters Inc 369E |
Rotorcraft | St Louis County Police Department Clayton, Missouri |
Standard | 1985-02-25 | ValidFAA registration status code V: Valid registration. All codes |
| N5134V | Hughes Helicopters Inc HUGHES 369D |
Rotorcraft | Temsco Helicopters INC Ketchikan, Alaska |
Standard | 1982-08-11 | ValidFAA registration status code V: Valid registration. All codes |
| N5125Q | Hughes Helicopters Inc HUGHES 369D |
Rotorcraft | Temsco Helicopters INC Ketchikan, Alaska |
Standard | 1982-08-10 | ValidFAA registration status code V: Valid registration. All codes |
| N5133U | Hughes Helicopters Inc HUGHES 369D |
Rotorcraft | Temsco Helicopters INC Ketchikan, Alaska |
Standard | 1982-08-10 | ValidFAA registration status code V: Valid registration. All codes |
| N102CG | Mcdonnell Douglas Helicopter 500N |
Rotorcraft | Individual owner Arizona |
Standard | Sale reportedFAA registration status code 17: Sale reported, pending cancellation. All codes | |
| N16Q | Hughes 369HS |
Rotorcraft | Individual owner Virginia |
Standard | PendingFAA registration status code R: Registration pending. All codes | |
| N20WY | Bell 206B |
Rotorcraft | Individual owner Montana |
Multiple | CanceledFAA registration status code 18: Sale reported, canceled. All codes | |
| N521PD | Mcdonnell Douglas Helicopter 369E |
Rotorcraft | Individual owner California |
Standard | Sale reportedFAA registration status code 7. All codes | |
| N642AB | Aerospatiale AS355F2 ECUREUIL |
Rotorcraft | Individual owner New Jersey |
Standard | Sale reportedFAA registration status code 7. All codes | |
| N67FA | Bell 206B |
Rotorcraft | Bas Part Sales LLC Greeley, Colorado |
Standard | ValidFAA registration status code V: Valid registration. All codes |
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Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.