# Allison 250-C18B

- Type: Engine model (FAA registry)
- Registry code: 03078
- Manufacturer (registry): ALLISON
- Model: 250-C18B
- Engine type: Turbo-shaft
- Power: 317 hp
- Data sheet: [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (OpenAirDocs)
- Holder: Rolls-Royce Corporation
- Installed in: 2 registered aircraft
- Page: https://openairdocs.org/engine/allison-250-c18b

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 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 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 78-14-08](https://openairdocs.org/ad/78-14-08): Fuel Pump Drive Spline · Rolls-Royce 250-C18, 250-C18A, 250-C18B and 3 more. Effective Oct 24, 1979
- [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 72-03-06](https://openairdocs.org/ad/72-03-06): Turbine Wheels · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 9 more. Effective Feb 8, 1972
- [AD 69-26-03](https://openairdocs.org/ad/69-26-03): Modify Power and Accessories Gear Box · Rolls-Royce 250-C18, 250-C18A, 250-C18B and 1 more. Effective Dec 25, 1969
- [AD 69-18-04](https://openairdocs.org/ad/69-18-04): Torquemeter Shaftgear · Rolls-Royce 250-C10 (T63-A-5), 250-C10B (T63-A-5A), 250-C10D (T63-A-700) and 4 more. Effective Oct 18, 1969
- [AD 69-18-02](https://openairdocs.org/ad/69-18-02): Internal Splines · Rolls-Royce 250-C10 (T63-A-5), 250-C10B (T63-A-5A), 250-C10D (T63-A-700) and 4 more. Effective Sep 3, 1969
- [AD 68-12-06](https://openairdocs.org/ad/68-12-06): Compressor Blades · Rolls-Royce 250-C10B (T63-A-5A), 250-C18, 250-C18A and 3 more. Effective Jun 18, 1968

Historical (superseded or no longer in force):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 (2)

- [N305AZ](https://openairdocs.org/aircraft/N305AZ): [Jta Express Inc](https://openairdocs.org/faa-owner/JTA%20EXPRESS%20INC), [Wilmington, DE](https://openairdocs.org/faa-place/DE/Wilmington), built 1968, S/N 480446
- [N369AV](https://openairdocs.org/aircraft/N369AV): [Vista I Inc](https://openairdocs.org/faa-owner/VISTA%20I%20INC), [Smithville, OH](https://openairdocs.org/faa-place/OH/Smithville), built 1970, S/N 110282-S

## NTSB investigations

None matched to aircraft with this engine model.

## FAA accident and incident reports

None matched to aircraft with this engine model.

## Service difficulty reports (2)

As reported by operators and repair stations, by the model named in the report.

- [SDR CA150303003](https://openairdocs.org/sdr/CA150303003), Feb 15, 2015: BLADE. SEPARATED. (CAN) DURING ENGINE START A TURBINE BLADE EXITED THE ENGINE CASE, SEVERED THE FUEL CONTROL UNIT, WHICH CAUSED A FIRE.
- [SDR 96ZZZX99](https://openairdocs.org/sdr/96ZZZX99), Sep 15, 1995: CONTROL CABLE. FAILED. N2 GOVERNOR CONTROL CABLE END FAILED WHILE BEING INSTALLED ON HELICOPTER. THREADED END BROKE OFF DURING INITIAL ADJUSTMENT ON GROUND. THIS CABLE END IS A 1/4-28

## 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 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
- [STC SQ00338AT](https://openairdocs.org/stc/SQ00338AT): Unison igniter leads, P/N9048222-101, 102, 103, 104, 105, 106. 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.