# Allison 250-C18

- Type: Engine model (FAA registry)
- Registry code: 03075
- Manufacturer (registry): ALLISON
- Model: 250-C18
- 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-c18

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 2006-13-06](https://openairdocs.org/ad/2006-13-06): Gas producer rotor assembly tie bolts · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 16 more. Effective Jul 26, 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 69-16-05](https://openairdocs.org/ad/69-16-05): Lower Gear Box and Oil Outlet Magnetic Plugs · Rolls-Royce 250-C18. Effective Aug 30, 1969
- [AD 68-22-02](https://openairdocs.org/ad/68-22-02): Compressor Assemblies · Rolls-Royce 250-C10B (T63-A-5A), 250-C18 and 250-C18A. Effective Nov 1, 1968
- [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

## Information bulletins (advisory) (1)

- [SAIB CE-01-10](https://openairdocs.org/saib/CE-01-10): . Issued Jan 24, 2001

## Registered aircraft (2)

- [N206WC](https://openairdocs.org/aircraft/N206WC): [Ruckle Kelby J](https://openairdocs.org/faa-owner/RUCKLE%20KELBY%20J), [Whittemore, MI](https://openairdocs.org/faa-place/MI/Whittemore), built 1969, S/N 345
- [N48316](https://openairdocs.org/aircraft/N48316): [Hammock Flying Service Inc](https://openairdocs.org/faa-owner/HAMMOCK%20FLYING%20SERVICE%20INC), [Smithville, AR](https://openairdocs.org/faa-place/AR/Smithville), built 1966, S/N 3628

## 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 CEN16LA182](https://openairdocs.org/ntsb/CEN16LA182), May 13, 2016: Bell 47G 3B 1 (N48316), Portia, AR, substantial damage, 1 fatal. Probable cause: The pilot's decision to perform a sliding takeoff from the elevated platform, which resulted in a dynamic rollover when the right skid plate caught on a protruding screw. Contributing to the accident…
- [NTSB NYC95LA147](https://openairdocs.org/ntsb/NYC95LA147), Jul 10, 1995: Bell 47G-3B-1 (N48316), Hammonton, NJ, destroyed, 1 fatal. Probable cause: failure of the collective yoke bearing, which resulted in an uncontrolled descent and collision with trees. A factor relating to the accident was: the manufacturer's inadequate inspection interval of…
- [NTSB NYC84LA055](https://openairdocs.org/ntsb/NYC84LA055), Dec 18, 1983: Bell 47-G3B1 (N48316), Dummerston, VT, 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 20160513007139A](https://openairdocs.org/incident/20160513007139A), May 13, 2016: Bell 47G-3B-1 (N48316), Portia, AR, Destroyed, 1 fatal. On may 5, 2016, at 0715 CST, a Bell 47G, N48316, registered to hammock flying service, inc, collided with the operator?s reloading truck in Portia, Arkansas,…
- [Accident 19950710017499A](https://openairdocs.org/incident/19950710017499A), Jul 10, 1995: Bell 47G3B1 (N48316), Hammonton, NJ, Destroyed, 1 fatal. Crashed into trees on forced landing. Collective pitch control bearing failed, due worn out. No required inspection
- [Accident 19831218061529A](https://openairdocs.org/incident/19831218061529A), Dec 18, 1983: Bell 47G3B1 (N48316), Dummerston, VT, Substantial damage. Tail rotor hit the ground on a practice autorotation landing. Lost lateral control. Collapsed a skid. Rolled over.

## Service difficulty reports (27)

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

- [SDR 2012FA0000550](https://openairdocs.org/sdr/2012FA0000550), Aug 7, 2012: FLEX COUPLING. SEPARATED. FLEX COUPLING FAILED AT OUTPUT OF INTERMEDIATE GEARBOX. SUBSTATIAL DAMAGE OCCURED DURING HARD LANDING.
- [SDR AU510001641](https://openairdocs.org/sdr/AU510001641), Jul 4, 2005: STROBE. WRONG PART. (AUS) INCORRECT STROBE LIGHT FITTED. THE INCORRECT LIGHT WAS APPROXIMATELY 50MM (1.96IN) HIGHER THAN THE ORIGINAL LIGHT. THIS EXTRA HEIGHT BROUGHT THE LIGHT INT
- [SDR CA041007004](https://openairdocs.org/sdr/CA041007004), Sep 27, 2004: GEAR. WORN. (CAN) THIS IS THE OIL PUMP GEAR THAT DRIVES THE HYDRAULIC PUMP ON THE AC, GREASING INTERVAL IS 300 HRS. THIS SHAFT WAS GREASED EVERY 100 HRS AND HAS TOTALLY WOR
- [SDR ERAA080478](https://openairdocs.org/sdr/ERAA080478), Jul 18, 2002: GOVERNOR. MALFUNCTIONED. TORQUE SPLITS UP TO 30% IN CRUISE FLIGHT. GOVERNOR REPAIRED AND TESTED SERVICEABLE IAW HONEYWELL OHM FORM 15-1095A. CEB'S A-1353R2 AND 1384 FOUND N/A BY UNIT S/
- [SDR ERAA080479](https://openairdocs.org/sdr/ERAA080479), Jul 18, 2002: TURBINE WHEEL. DAMAGED. UNIT HAS LOW POWER. NR 4 NOZZLE AND NR 3 WHEEL CRACKED. INSTALLED NEW NR 3 & 4 WHEEL AND NEW NR 4 NOZZLE. C/W CEB-1360; RE-COAT INNER SHAFT.
- [SDR ERAA080480](https://openairdocs.org/sdr/ERAA080480), Jul 18, 2002: DIFFUSER. DAMAGED. ALUMINUM DAMAGED BY IMPELLER. REMOVED AND RE-APPLIED PLASMA SPRAY ON CONTOUR. (OVERHAULED).
- [SDR ERAA080474](https://openairdocs.org/sdr/ERAA080474), Jul 17, 2002: SHAFT. STIFF. THROTTLE SHAFT STIFF. THROTTLE BUSHING, REPLACED WITH NEW, AND GOVERNOR WAS RE-CALIBRATED TO FINAL CALIBRATION LIMITS.
- [SDR ERAA080475](https://openairdocs.org/sdr/ERAA080475), Jul 17, 2002: GOVERNOR. MALFUNCTIONED. TORQUE SPLITS - SPEEDS UP AND ADJ MAX BEEP TO 99 PERCENT N2. THEN WAS TEST FLOWN - CHECKED MAX BEEP AT 96 PERCENT - ADJ TO 99 PERCENT AND HOVER A/C MAX BBEP FEL
- [SDR ERAA080476](https://openairdocs.org/sdr/ERAA080476), Jul 17, 2002: SHAFT. STIFF. STIFF THROTTLE SHAFT. ROUGH/ DRY INTERNAL BEARINGS. ACTION TAKEN: SENT TO ACRO FOR REPAIR. REPAIRED AND TESTED IAW HONEYWELL OHM FORM 15-1095A.
- [SDR HEEA080433](https://openairdocs.org/sdr/HEEA080433), Jul 11, 2002: SHAFT. WORN. SHAFT HAS SPALLING AND STEP WEAR ON GEAR TEETH BEYOND NORMAL WEAR.
- [SDR HEEA078481](https://openairdocs.org/sdr/HEEA078481), Mar 29, 2002: BEARING RACE. SPALLED. TURBINE WAS REMOVED DUE TO METAL IN OIL. INSPECTION REVEALED SPALLING ON INNER RACE COUPLING BEARING RACE. INSTALLED NEW INNER RACE COUPLING.
- [SDR AUS20020115](https://openairdocs.org/sdr/AUS20020115), Jan 18, 2002: BEARING. CRACKED. (AUS) MAIN TRANSMISSION BEARING INNER RACE SPLIT WITH HEAVY BRINNELLING EVIDENT. METAL CONTAMINATION OF TRANSMISSION OIL SYSTEM.
- [SDR AUS20011238](https://openairdocs.org/sdr/AUS20011238), Nov 14, 2001: BLADE. FAILED. (AUS) SECOND STAGE COMPRESSOR BLADES (2OFF) FAILED). MAJOR DOWNSTREAM DAMAGE. SEVERAL OTHER SECOND STAGE ROTOR BLADES WERE FOUND TO BECRACKED FROM THE TRAILING 
- [SDR ERAA092664](https://openairdocs.org/sdr/ERAA092664), Jan 11, 2001: SEAL. FOD. FOD DAMAGE TO SEAL. CONTOUR FOUND DAMAGED AT CYCLE 1 INDUCTION. FULL OVERHAUL INCLUDING CONTOUR RESTORATION.
- [SDR CA990915064](https://openairdocs.org/sdr/CA990915064), Sep 3, 1999: ATTACH RING. BROKEN. (CAN) THE HORIZONTAL FORWARD ATTACHMENT RING ON THE TAILBOOM WAS FOUND BROKEN OFF.
- [SDR 99ZZZX3280](https://openairdocs.org/sdr/99ZZZX3280), Aug 10, 1999: BEARING. GALLED. BEARING FOUND GALLED IN ENGINE COMPRESSOR SECTION.
- [SDR ERAA062391](https://openairdocs.org/sdr/ERAA062391), May 13, 1999: CASE. MISMANUFACTURED. OUTER COMBUSTION CASE COULD NOT BE INSTALLED BECAUSE AIR TUBE BOSS IS .008 INCH OUT OF ROUND.
- [SDR ERAA062371](https://openairdocs.org/sdr/ERAA062371), Apr 21, 1999: SHIELD. CRACKED. TURBINE DUE 1,750 HOUR INSPECTION DUE TO NR 1 AND NR 2 WHEEL CYCLE OUT. DISCOVERED CONDITION OF NR 1 NOZZLE SHIELD DURING TEARDOWN. THE DAMAGE STARTS AT THE MIS
- [SDR ERAA061869](https://openairdocs.org/sdr/ERAA061869), Apr 16, 1999: SUMP COVER. MISMANUFACTURED. SUMP COVER COULD NOT BE INSTALLED DUE TO LOOSE DEBRIS AND FLAKING OVERSPRAY INSIDE OF COVER. ONE HOLE CLOGGED.
- [SDR ERAA061867](https://openairdocs.org/sdr/ERAA061867), Apr 12, 1999: GP SUPPORT. MISOVERHAULED. GP SUPPORT SENT FOR OVERHAUL 8-4-98, COULD NOT BE INSTALLED DUE TO ROUGH SURFACE AT NR 8 OIL TUBE SEAL, AND SUMP NUT E-RING SEAT.
- [SDR ERAA061862](https://openairdocs.org/sdr/ERAA061862), Mar 24, 1999: NUT. LEAKING. NEW NUT; CAP LEAKS.
- [SDR CA980804009](https://openairdocs.org/sdr/CA980804009), Jul 16, 1998: FAN. WRONG PART. (CAN) IN SHOP FOR REPAIR, LEAR SIEGLER STARTER/GENERATOR HAD AN APC FAN P/N 1503G1107 INSTEAD OF THE LEAR SIEGLER FAN P/N 23032-1481.
- [SDR CA980507006](https://openairdocs.org/sdr/CA980507006), May 6, 1998: CLAMP. CRACKED. (CAN) EXHAUST COLLECTOR WELDED MARON CLAMP RING FOUND CRACKED.
- [SDR 97ZZZX206](https://openairdocs.org/sdr/97ZZZX206), Dec 11, 1996: HOSE. LEAKING. ENGINE DRIVEN FUEL PUMP INLET LINE LEAKING AT FLARE FITTING DUE TO A CRACK. REPLACED WITH SERVICEABLE LINE.
- [SDR AU960191](https://openairdocs.org/sdr/AU960191), Feb 15, 1996: DRIVE SHAFT. SHEARED. (AUS) TAIL ROTOR DRIVE SHAFT SHEARED APPROXIMATELY 457.2MM (18IN) FROM THE FORWARD END - SEVERAL LONGITUDINAL CRACKS WERE EVIDENT IN THEAREA OF THE FAILURE WHEN
- [SDR AU960192](https://openairdocs.org/sdr/AU960192), Feb 15, 1996: HOUSING. CORRODED. (AUS) STABILIZER STRUT DAMPER SHAFT PULLED FROM FITTING DURING HEAVY VIBRATION FOLLOWING TAIL ROTOR DRIVE SHAFT FAILURE (MDR 96/0191) - FITTING EXHIBITED SIGNS 
- [SDR AU960152](https://openairdocs.org/sdr/AU960152), Feb 2, 1996: BLADE. FAILED. (AUS) COMPRESSOR NO2/3 ROTOR ASSEMBLY BLADE FAILED - BLADES EXITED THROUGH BOTH COMPRESSOR CASE HALVES - FURTHER DAMAGE TO TURBINESECTION DUE TO FOD AND OVERTEM

## STCs that may be installed (OpenAirDocs) (4)

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 SE769NW](https://openairdocs.org/stc/SE769NW): Installation of Soloy Part No. 250-1001-1 fuel line. Siam Hiller Holdings 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
- [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.