# Allison 250-C40B - Type: Engine model (FAA registry) - Registry code: 03108 - Manufacturer (registry): ALLISON - Model: 250-C40B - Engine type: Turbo-shaft - Power: 715 hp - Data sheet: [TCDS E1GL](https://openairdocs.org/tcds/E1GL) (OpenAirDocs) - Holder: Rolls-Royce Corporation - Installed in: 1 registered aircraft - Page: https://openairdocs.org/engine/allison-250-c40b 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 2006-20-07](https://openairdocs.org/ad/2006-20-07): Adds an additional life limit for third- and fourth-stage turbine wheels · Rolls-Royce 250-C30, 250-C30G, 250-C30G/2 and 11 more. Effective Nov 2, 2006 - [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 97-25-09](https://openairdocs.org/ad/97-25-09): Helical Power Takeoff Gearshaft Assembly · Rolls-Royce 250-C40B. Effective Dec 23, 1997 - [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 Effective Nov 26, 1982 Historical (superseded or no longer in force): - [AD 2004-24-09](https://openairdocs.org/ad/2004-24-09) (historical): Fuel nozzle · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 40 more.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 (1) - [N40DP](https://openairdocs.org/aircraft/N40DP): [Londonaire LLC](https://openairdocs.org/faa-owner/LONDONAIRE%20LLC), [Wichita Falls, TX](https://openairdocs.org/faa-place/TX/Wichita%20Falls), built 1997, S/N 49035 ## 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 (87, newest 50) As reported by operators and repair stations, by the model named in the report. - [SDR QMLA2019092619076](https://openairdocs.org/sdr/QMLA2019092619076), Sep 26, 2019: FILTER. ABNORMAL. DURING CLIMB OUT, PILOT TURNED ON AIR CONDITIONING SYSTEM AND CABIN FILLED WITH SMOKE. PILOT IMMEDIATELY RETURNED BACK TO BASE AND MAINTENANCE WAS ON SITE TO IN - [SDR QMLA2018101118110](https://openairdocs.org/sdr/QMLA2018101118110), Oct 10, 2018: MOUNT. CRACKED. DURING PREFLIGHT INSPECTION, FOUND RIGHT HAND TRANSMISSION MOUNT ASSEMBLY P/N 230-031-619-101 CRACKED AT THE EAR FOR THE LATERAL ISOLATION MOUNT ATTACH POINT. - [SDR K2DA2020012220](https://openairdocs.org/sdr/K2DA2020012220), Oct 3, 2018: BLADE. DAMAGED. AT 1104 HST, WAS AT APPROXIMATELY N19.54`02" W156.06`58" TRANSITIONING THROUGH PHKO CLASS D AIRSPACE AT 1350`MSL AND 125 KIAS ON A HEADING OF 165 DEGREES, EN R - [SDR 2PJA20180717001](https://openairdocs.org/sdr/2PJA20180717001), Jul 17, 2018: TRANSDUCER. FAILED. ON TAKEOFF, DURING CLIMB NR 2 HYDRAULIC PRESSURE REDUCED TO 0 PSI. PAGE 2 CAUTION WAS ILLUMINATED. AIRCRAFT DIVERTED TO KMTN. MAINTENANCE REMOVED AND REPLACED T - [SDR Q6HA2016092900001](https://openairdocs.org/sdr/Q6HA2016092900001), Sep 27, 2016: WIRE. BROKEN. WITH LANDING GEAR SELECTED DOWN THE LANDING GEAR DOES NOT EXTEND INTERMITTENTLY. WARNING HORN DOES SOUND WITH GEAR HANDLE DOWN AND GEAR UP. WIRE G11A22 FOUND BR - [SDR QMLA201601316010](https://openairdocs.org/sdr/QMLA201601316010), Feb 13, 2016: ENGINE. MAKING METAL. ENGINE REMOVAL DUE TO CHIP EVENTS IN SUMP CHIP DETECTOR. - [SDR CA151102009](https://openairdocs.org/sdr/CA151102009), Oct 30, 2015: TUBE. DAMAGED. (CAN) THE FOLLOWING HAS BEEN REPORTED TO MFG: IN-FLIGHT SHUTDOWN. THE ACFT MADE A SAFE LANDING AND NO ADDITIONAL DAMAGE WAS DONE TO THE ACFT OR PERSONNEL. THE L - [SDR HEER20150825656](https://openairdocs.org/sdr/HEER20150825656), Aug 25, 2015: BEARING. SPALLED. ENGINE REMOVED 8-12-15 DUE TO OVERTORQUE. REPLACED TURBINE NR 5 BEARING DUE TO DEEP SCRATCHES ON BALLS AND POSSIBLE SPALLING ON BEARING OUTER RACE. INSTALLED NE - [SDR CA150827010](https://openairdocs.org/sdr/CA150827010), Aug 20, 2015: SHEAR RESTRAINT. DEBONDED. (CAN) ACFT EXPERIENCE HIGH LATERAL VIBRATION IN FLIGHT. ACFT RETURNED TO BASE AND VISUAL INSPECTION REVEALED ELASTOMERIC DEBONDED ON SHEAR RESTRAINT. - [SDR CA150429014](https://openairdocs.org/sdr/CA150429014), Apr 26, 2015: ENGINE. MALFUNCTIONED. (CAN) ACFT REPORTED TO HAVE SUFFERED A HARD LANDING FOLLOWING A PROBLEM WITH THE NR 1 ENGINE. A/C SKIDS ARE SPLAYED. - [SDR CA150505001](https://openairdocs.org/sdr/CA150505001), Apr 26, 2015: SUN GEAR. FAULTY. (CAN) FINDINGS BY STEPS OF OCCURRENCE: A CRACK SOUND DURING HOVER HEARD BY EVERYONE INCLUDING PASSENGERS. BOTH ENGINES NP POWER TURBINE RPM REACHED TO PERCENT 1 - [SDR CA150421007](https://openairdocs.org/sdr/CA150421007), Apr 14, 2015: NUT. DAMAGED. (CAN) TWO ANCHOR NUTS WERE FOUND BROKEN, CRACKED AND MISSING THE RETENTION SPRING. - [SDR QMLA2015021215010](https://openairdocs.org/sdr/QMLA2015021215010), Feb 12, 2015: STRIP. CRACKED. DURING BLADE REMOVAL, FOR 100HR YOKE INSPECTION, FOUND CRACKS IN ABRASION STRIP ON LE OF BLADE SN A-2180. DETERMINED CRACK IS OUT OF LIMITS IAW THE MM. - [SDR QMLA2014061614074](https://openairdocs.org/sdr/QMLA2014061614074), Jun 16, 2014: YOKE. CRACKED. UPON INITIAL INSPECTION FOUND FOUR CRACKS IN MAIN ROTOR YOKE LOCATED BETWEEN STATION 26 & 31. CRACKS ARE 2 TO 4.5 INCHES IN LENGTH. AFTER REMOVING SEALANT FROM - [SDR CA131121001](https://openairdocs.org/sdr/CA131121001), Nov 14, 2013: ENGINE. FAILED. (CAN) DURING AN OFFSHORE FLIGHT, THE NR 1 ENGINE EXPERIENCED A SUMP CHIP LIGHT, THEN A LOUD BANG AND LOSS OF OIL PRESSURE. ENGINE WAS SECURED AND THE ACFT FLOWN - [SDR QMLA2013110613159](https://openairdocs.org/sdr/QMLA2013110613159), Nov 6, 2013: YOKE. CRACKED. WHILE PERFORMING 150 HR INSPECTION OF MAIN ROTOR YOKE, FOUND SIX NEW CRACKS SINCE LAST INSPECTION. SMALLEST CRACK WAS 0.5 AND LONGEST CRACK 3.375. FOUR ON TOP O - [SDR QMLA2013090413126](https://openairdocs.org/sdr/QMLA2013090413126), Sep 4, 2013: STUD. BROKEN. STUD HAD SHEARED OFF OF THE TAIL ROTOR GEARBOX MOUNTING FLANGE AT ONE O`CLOCK POSITION. NOTICED POSITIONS THREE, FIVE AND ELEVEN O`CLOCK STUDS WERE LOOSE AS WEL - [SDR CA130618008](https://openairdocs.org/sdr/CA130618008), Jun 13, 2013: CONTROL TUBE. CRACKED. (CAN) DURING A ROUTINE ANNUAL INSPECTION, WHILE INSPECTING THE TAIL ROTOR FLIGHT CONTROLS IN THE BELLY OF THE ACFT, SOME CHAFING WAS NOTED ON CONTROL TUBE, PN 4 - [SDR CA130325016](https://openairdocs.org/sdr/CA130325016), Mar 24, 2013: CONTROL TUBE. BROKEN. (CAN) PILOT LOST THE TAIL ROTOR CONTROL DURING FLIGHT. ROD END BROKEN. - [SDR Q2HA20121109001](https://openairdocs.org/sdr/Q2HA20121109001), Oct 27, 2012: FITTING. LOOSE. ON OCTOBER 26, 2012 THE NR 1 ENGINE FUEL NOZZLE WAS REMOVED AND RESHIMMED FOR AN INTERMITTENT STARTING PROBLEM. THE MAINTENANCE ACTION WAS COMPLETED AND SIGNED - [SDR QMLA2012050912076](https://openairdocs.org/sdr/QMLA2012050912076), May 9, 2012: ENGINE. MAKING METAL. NR 1 ENGINE SCAVENGE CHIP LIGHT ILLUMINATED DURING START UP. REMOVED SCAVENGE CHIP DETECTOR AND VISUALLY INSPECTED. FOUND MASS QUANTITIES OF METAL ON THE CHIP D - [SDR QMLA2012021412024](https://openairdocs.org/sdr/QMLA2012021412024), Feb 14, 2012: STATIC PORT. SHORTED. PILOT REPORTED ELECTRICAL FUMES IN COCKPIT. FOUND STATIC PORT SHORTED - [SDR CA061023003](https://openairdocs.org/sdr/CA061023003), Oct 20, 2011: CONTROL TUBE. SCRATCHED. (CAN) CONTROL TUBE, PN 222-001-021-145 WAS INSTALLED ON WRONG SIDE OF PILOT CYCLIC STICK LOWER LEVER CAUSING A FOULING CONDITION WITH THE ACFT STRUCTURE IN THE - [SDR AC2R0CT03062011](https://openairdocs.org/sdr/AC2R0CT03062011), Mar 6, 2011: SHAFT. CRACKED. OUTER SHAFT FOUND CRACKED AT TT 259.0 AT DISASSEMBLY. ENGINE WAS REMOVED FOR SMOKING ON SHUTDOWN AND VXP INDICATED VIBRATIONS TRENDING UP. RAN ON TEST CELL AND - [SDR CA100812001](https://openairdocs.org/sdr/CA100812001), Aug 4, 2010: ROD END. LEAKING. MFG RECEIVED REPORT OF A 430 COLLECTIVE FLIGHT CONTROL MALFUNCTION DURING PREPARATION FOR TAKEOFF. EVENT OCCURED ON GROUND. AFTER ACFT WAS SHUTDOWN A OIL LEAK W - [SDR QMLA2010051810014](https://openairdocs.org/sdr/QMLA2010051810014), May 18, 2010: HANGER ASSY. SHEARED. DURING ROUTINE INSPECTION DISCOVERED MOUNTING FLANGE BROKE OFF OF THE NR1 TAIL ROTOR DRIVE SHAFT HANGER BRG. PERFORMED INSPECTION OF THE SURROUNDING AREA AND RE - [SDR 1E9R201001](https://openairdocs.org/sdr/1E9R201001), Feb 19, 2010: BLADE. CRACKED. ACFT WAS FLOWN TO FACILITY, REPORTED DEBONDING OF TAIL ROTOR BLADE L/E AT TIP OF BLADE. UPON FURTHER INVESTIGATION OF BLADE, IT WAS DISCOVERED THAT THE ROOT END - [SDR CA100122007](https://openairdocs.org/sdr/CA100122007), Jan 20, 2010: STUD. LOOSE. (CAN) QTY (2) STUDS PARTIALLY BACKED OUT OF THE THREADED HOLES OF THE 2-1/2 BRG CAGE MOUNTING BOSS. STUDS BACKED OUT APPROX 1 AND 2 THREADS RESPECTIVELY. NUTS O - [SDR AC2A2009090183074](https://openairdocs.org/sdr/AC2A2009090183074), Sep 1, 2009: UNKNOWN. MALFUNCTIONED. SIX MINUTES OUT OF VENICE, LA, TRANSMISSION - [SDR QMLR MC708](https://openairdocs.org/sdr/QMLR%20MC708), Aug 27, 2009: BLADE. CRACKED. FOUND TAIL ROTOR BLADE ROOT TO BE CRACKED IN VICINITY OF PITCH HORN. - [SDR AC2A2009053181959](https://openairdocs.org/sdr/AC2A2009053181959), May 31, 2009: PICKUP. MALFUNCTIONED. ENROUTE, YELLOW M/ECU2 INDICATOR, WHITE ECU INDICATOR ABOVE THE NR 2 ENGINE TQ AND NP INDICATION FLUCTUATED FOR ABOUT FIVE MINUTES BEFORE IT RETURNED TO NORMAL - [SDR AC2A2009050381739](https://openairdocs.org/sdr/AC2A2009050381739), May 3, 2009: WARNING LIGHT. ILLUMINATED. FLYING FROM THE HERCULES 120 TO 299B AND THE NR1 M/ECU CAUTION LIGHT ILLUMINATED IN FLIGHT, RETURNED TO DEPARTURE AND SHUTDOWN. - [SDR AC2A2009042481568](https://openairdocs.org/sdr/AC2A2009042481568), Apr 24, 2009: ECU. FAULTY. IN FLIGHT, YELLOW M/ECU2 LIGHT ILLUMINATED, FOLLOWED BY A WHITE ECU LIGHT ABOVE THE NR2 ENGINE TORQUE. RETARDING THE THROTTLE TO IDLE HAD NO EFFECT ON THE NR2 N - [SDR AC2A2009031181030](https://openairdocs.org/sdr/AC2A2009031181030), Mar 11, 2009: WARNING MESSAGE. ILLUMINATED. TAKING OFF FROM SP 77A TO WD 109 AND THE 1 M/ECU 2 LIGHT ILLUMINATED ALONG WITH THE ECU LIGHT ABOVE THE NR 1 TORQUE AND THE FADEC HORN. WENT TO THE MANUAL MODE - [SDR AC2A2009031081018](https://openairdocs.org/sdr/AC2A2009031081018), Mar 10, 2009: WARNING MESSAGE. ILLUMINATED. LANDED AT 0945 WHEN THE 1 M/ECU 2 LIGHT ILLUMINATED IN FLIGHT. MX CAME OUT TO THE ACFT & CLEARED THE FAULT WITH COMPUTER. TOOK OFF AT 1025 AND 5 MINUTES INTO TH - [SDR 2009FA0000275](https://openairdocs.org/sdr/2009FA0000275), Feb 9, 2009: NUT. LOOSE. DURING COURSE OF SCHEDULED INSP, NUT RETAINING THE TAIL ROTOR PITCH CHANGE CONTROL BEARING WAS FOUND TO BE LOOSE ALLOWING BEARING INNER RACE TO SPIN ON ITS SEAT - [SDR AC2A2008080377650](https://openairdocs.org/sdr/AC2A2008080377650), Aug 3, 2008: WARNING MESSAGE. FALSE ACTIVATION. DURING THE RETURN FLIGHT FROM, EXPERIENCED A ECU (FADEC) FAILURE ON THE NR 2 ENGINE. IAW THE EMERGENCY PROCEDURES, REDUCED THE THROTTLE ON THE NR 2 ENGINE AND S - [SDR 4911905172008](https://openairdocs.org/sdr/4911905172008), May 17, 2008: VERTICAL GYRO. FAULTY. DURING CRUISE FLIGHT, PILOT FELT A VIBRATION IN THE AC FOLLOWED BY ATTITUDE EXCURSIONS IN THE PITCH AXIS. THIS OCCURRED OVER A PERIOD OF APPROXIMATELY (2) MINUT - [SDR AC2A119524](https://openairdocs.org/sdr/AC2A119524), Apr 21, 2008: GEARBOX. CRACKED. FLANGE MOUNTING EAR COMPLETELY CRACKED ON TAIL ROTOR GEAR BOX OUTPUT SLEEVE HOUSING. - [SDR AC2A119271](https://openairdocs.org/sdr/AC2A119271), Mar 17, 2008: WARNING LIGHT. ILLUMINATED. NR 2 ENGINE CHIP SUMP LIGHT ILLUMINATED IN FLIGHT. FOLLOWED EMERGENCY CHECKLIST AND LANDED. REMOVED CHIP PLUGS, CLEANED AND PERFORMED PENALTY RUN. FOUND SERVICE - [SDR AC2A118979](https://openairdocs.org/sdr/AC2A118979), Mar 2, 2008: STOP. CRACKED. STOP CRACKED IN RADIUS. - [SDR 495](https://openairdocs.org/sdr/495), Jan 20, 2008: MAGNETIC SEAL. LEAKING. NOTICED FLUCTUATING ENGINE OIL PRESSURE ON NR 2 ENGINE. PULLED OUT AIRCRAFT EMERGENCY PROCEDURE CHECKLIST. FOLLOWED EMERGENCY PROCEDURE. OIL PRESSURE DECREASED - [SDR AC2A118178](https://openairdocs.org/sdr/AC2A118178), Nov 11, 2007: ENGINE. WARNING LIGHT. DURING FLIGHT THE NR 2 ENGINE CHIP SCAV CAUTION LIGHT BEGAN TO FLICKER. NO FLUCTUATIONS IN EITHER ENGINE TEMP OR PRESSURE WERE NOTED. CONTINUED FLIGHT TO VENICE - [SDR AC2A117289](https://openairdocs.org/sdr/AC2A117289), Aug 31, 2007: PICKUP. INOPERATIVE. NR 1 ECU FAILED FIXED FLOW. AIRCRAFT WAS REPOSITIONING FOR TAKEOFF, AT A HOVER, THEN SET LIGHT ON SKIDS, PLACED INTO MANUAL MODE, THROTTLE REDUCED, SET FULL ON - [SDR AC2A117123](https://openairdocs.org/sdr/AC2A117123), Aug 27, 2007: TRANSMISSION. MAKING METAL. XMSN CHIP / CHP PLTRY GB ILLUMINATED IN FLIGHT 8 MINUTES AFTER DEPARTURE FROM ICY HELIPORT. AIRCRAFT RETURNED TO ICY WITHOUT INCIDENT.SMALL AMOUNT OF METAL WAS - [SDR AC2A113419](https://openairdocs.org/sdr/AC2A113419), Jan 3, 2007: SENSOR. MALFUNCTIONED. NR 1 ENGINE NP2 RPM PICKUP MALFUNCTIONED/FAILED. INSTALLED SERVICABLE PART. - [SDR AC2A113281](https://openairdocs.org/sdr/AC2A113281), Dec 18, 2006: TRANSMITTER. FAILED. SHORTLY AFTER TAKING OFF FROM ST37 I EXPERIENCED A NR 2 ECU FAILURE TO THE HIGH SIDE. FOLLOWED THE EMERGENCY CHECKLIST BY GOING TO MANUAL CONTROL OF NR 2 ENGINE - [SDR AC2A112008](https://openairdocs.org/sdr/AC2A112008), Oct 22, 2006: ACTUATOR. MALFUNCTIONED. CAUSED NR 1 PITCH ERROR AND KICKED AFCS INTO SAS MODE, REPLACED ACTUATOR. - [SDR AC2A110528](https://openairdocs.org/sdr/AC2A110528), Jul 27, 2006: BEARING. DELAMINATED. FOUND DELAMINATED / REPLACED BEARING. - [SDR AC2A110527](https://openairdocs.org/sdr/AC2A110527), Jul 27, 2006: BEARING. DELAMINATED. FOUND DELAMINATED / REPLACED BEARING All 87: https://openairdocs.org/engine/allison-250-c40b/reports.md ## STCs that may be installed (OpenAirDocs) (1) 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 SE578GL](https://openairdocs.org/stc/SE578GL): Installation of a fuel flow transducer. Shadin Avionics --- 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.