# Service difficulty reports: Allison 250-C28B

A list on [Allison 250-C28B](https://openairdocs.org/engine/allison-250-c28b.md).

Newest first. General aviation reporting is voluntary.

Page 1 of 6 · 286 reports

- [SDR 2021FA0000190](https://openairdocs.org/sdr/2021FA0000190.md): Pinion Gear · flaking · Jun 30, 2021 · N275GB · Bell 206L1 · Main Rotor Gearbox
  > AIRCRAFT OWNER EXPERIENCED THREE TRANSMISSION CHIP LIGHT WARNING INDICATIONS. THE TWO CHIP DETECTORS WERE PULLED AND METAL SLIVERS WERE FOUND ON THE LOWER CHIP DETECTOR. THE PROCEDURES LISTED IN THE BELL 206L-SERIES MAINTENANCE MANUAL PARAGRAPH 66-14. SERVICEA
- [SDR EVCA20151125001](https://openairdocs.org/sdr/EVCA20151125001.md): Actuator · inoperative · Nov 24, 2015 · N89AE · Bell 206L1 · Engine Controls
  > POWER EXCURSION DURING APPLICATION. POST POWER ON AUTO ROTATION FLARE. TORQUE APPLIED THROUGH 40% FROM 0 AT WHICH POINT TORQUE VARIED 40%-70 &-45%-60% WITH 0 COLLECTIVE MOVEMENT. ACFT YAWED RT & LT TWICE. ALL OTHER ENG INDICATIONS WITHIN NORMAL LIMITS. EV
- [SDR 2014FA0000572](https://openairdocs.org/sdr/2014FA0000572.md): Strap · separated · Sep 29, 2014 · Bell 206L1 · Main Rotor Head
  > DURING O/H OF M/R HUB ASSY, TT STRAP ASSY SCRAPPED DUE TO SEPARATION OF PLASTIC AROUND BUSHING HOLES WITH TT: 771.9 AND TIME IN SERVICE 14 MONTHS. THIS PART HAS A LIFE LIMIT OF 1200 HRS, 24 MONTHS WHICH EVER COMES FIRST. ANY SEPARATION ON THE PLASTIC COATING
- [SDR EVCA2014071700063](https://openairdocs.org/sdr/EVCA2014071700063.md): Mount · corroded · Jan 25, 2014 · N88AE · Bell 206L4 · Engine Mount Section
  > WHEN DISASSEMBLY OF ACFT AFTER IT WAS DECOMMISSION, MECHANIC FOUND ENG MOUNT SUPPORT LEG CORRODED THROUGH.
- [SDR AC2A201311080004](https://openairdocs.org/sdr/AC2A201311080004.md): Blade · damaged · Oct 26, 2013 · N39LR · Bell 206L1 · Tail Rotor Blades
  > ON POST FLIGHT INSPECTION, PILOT FOUND FOD DAMAGE ON TAIL ROTOR BLADE APPEARING TO BE FROM A BOLT.
- [SDR 2013FA0000494](https://openairdocs.org/sdr/2013FA0000494.md): Nozzle · broken · Aug 26, 2013 · N206SL · Bell 206L1 · Fuel Injector Nozzle
  > PILOT NOTED A +5 DEGREE ON POWER CHECK AND AT TIMES DID NOT FEEL THAT THE ENGINE WAS PRODUCING FULL POWER. UPON REMOVING THE ENGINE INLET COWLING A 1.7500" PIECE OF TUBING WITH A 90 DEGREE BEND WAS FOUND INSIDE THE INLET SCREEN AREA ON THE SCREEN FLOOR. THE
- [SDR EVCA2012091200035](https://openairdocs.org/sdr/EVCA2012091200035.md): Chip Detector · broken · Sep 8, 2012 · N279AE · Bell 206L1 · Main Rotor Gearbox
  > TRANSMISSION CHIP DETECTOR HOUSING HEAD BROKEN OFF FROM BODY.
- [SDR CA120328006](https://openairdocs.org/sdr/CA120328006.md): Washer · worn · Mar 27, 2012 · Bell 206L1 · Tail Rotor Drive System
  > (CAN) DURING 100-HR PERIODIC INSPECTION IT WAS NOTICED THAT THE TAIL ROTOR BELLCRANK AT THE END OF THE TAILBOOM WHICH ACTUATES THE PITCH CHANGE MECHANISM HAD A LARGE AMOUNT OF AXIAL PLAY CAUSING THE BELLCRANK TO "FLOAT" WITHIN ITS ATTACHMENT. UPON REMOVAL OF
- [SDR CA110506005](https://openairdocs.org/sdr/CA110506005.md): Erosion Shield · debonded · Apr 14, 2011 · Bell 206L1 · Main Rotor Blades
  > ON ANNUAL INSP THE EROSION STRIP OF THE MAIN ROTOR BLADE TIP CAP ASSY WAS FOUND DEBONDED & SEPARATING ON MAIN ROTOR BLADE PN 206-015-001-107 SN A-2908. MAIN ROTOR BLADE WAS REMOVED FROM SERVICE & A LOANER INSTALLED. BLADE WAS SENT TO MFG CERTIFIED REPAIR STATI
- [SDR EVCA00010](https://openairdocs.org/sdr/EVCA00010.md): Blade · leaking · Dec 12, 2010 · N258AE · Bell 206L1 · Main Rotor Blades
  > CONSTANT WEEPING FROM THE (RED) MAIN ROTOR BLADE VENT HOLE - CONSTANT STREAK.
- [SDR CA100621003](https://openairdocs.org/sdr/CA100621003.md): Drive Shaft · bent · Jun 18, 2010 · Bell 206L1 · Tail Rotor Drive Shaft
  > DURING GROUND RUNS, A NOISE AND VIBRATION FELT IN THE AFT BAGGAGE COMPARTMENT, INVESTIGATION FOUND THE SHORT STEEL SHAFT TO BE BENT.007" AT THE AFT COUPLING END, A REPLACEMENT SHAFT INSTALLED AND VIBRATION ELIMINATED. CAUSE OF SHAFT OUT OF TOLERENCE UNKNOWN.
- [SDR 2010FA0000218](https://openairdocs.org/sdr/2010FA0000218.md): Transmission · making metal · Mar 8, 2010 · N27AE · Bell 206L1 · Main Rotor Gearbox
  > CHECKED TRANSMISSION CHIP DETECTOR AFTER CHIP LIGHT ILLUMINATED ON APPROACH TO LANDING. SMALL PIECE OF METAL FOUND ON CHIP DETECTOR, CLEARED BY MX, 30 MIN GROUND RUN PROVED NO MORE METAL ON CHIP PLUG. MOVED ACFT TO NEW LOCATION,.1 FLIGHT TIME REINPECTED CHIP
- [SDR 2010F00056](https://openairdocs.org/sdr/2010F00056.md): Support · cracked · Mar 2, 2010 · N108AE · Bell 206L1 · Fuselage Miscellaneous Structure
  > DURING THE PRELIMINARY INSP OF UNRELATED MX, THE INSPECTOR FOUND THE PILOT'S YOKE SUPPORT TO HAVE A RADIAL CRACK EXTENDING FROM THE RELIEF HOLE APPROX.3750". THIS IS ONE OF 4 SIMILAR UNITS DISCOVERED AT THIS TIME.
- [SDR 2010F00055](https://openairdocs.org/sdr/2010F00055.md): Support · cracked · Mar 2, 2010 · N139AE · Bell 206L1 · Fuselage Miscellaneous Structure
  > RADIAL CRACK WAS DISCOVERED IN THE BASE OF THE UNIT AT THE RELIEF HOLE. CRACK IS APPROX.25" LONG. THIS SUPPORT ATTACHES THE PILOT'S YOKE TO THE FLOOR OF THE ACFT.
- [SDR 2010F00062](https://openairdocs.org/sdr/2010F00062.md): Support · cracked · Mar 2, 2010 · N229AE · Bell 206L1 · Fuselage Miscellaneous Structure
  > CRACK IN NECK OF PART AT RELIEF HOLE. CRACK IS 0.9" LONG. PART CONNECTS PILOT'S YOKE TO ACFT FLOOR.
- [SDR CBR2010F00000](https://openairdocs.org/sdr/CBR2010F00000.md): Engine · power loss · Nov 16, 2009 · Bell 206L1 · Engine (Turbine/Turboprop)
  > WHILE IN CRUISE FLIGHT, RETURNING FROM SIGHTSEEING TOUR, PILOT NOTICED THE N2/NR LOWER THAN NORMAL. THE PILOT MADE SEVERAL COLLECTIVE ADJUSTMENTS IN AN ATTEMPT TO BRING THE RPM UP, WHICH RESULTED IN A FURTHER DECAY OF THE RPM TO 94 PERCENT. AFTER RADIO CONSU
- [SDR CA090728015](https://openairdocs.org/sdr/CA090728015.md): Drive Shaft · leaking · Jul 6, 2009 · Bell 206L1 · Main Rotor Gearbox
  > INPUT SEAL ON HELICOPTER MAIN TRANSMISSION LEAKED OIL WHICH WASHED MAIN DRIVESHAFT COUPLING GREASE THROUGH SHAFT AND INTO ENG COMPARTMENT. GREASE WAS DISCOVERED ON DAILY INSP BY PILOT AND HELICOPTER WAS GROUNDED FOR FURTHER INSP. THERE WAS NO INDICATION OF O
- [SDR CA090728016](https://openairdocs.org/sdr/CA090728016.md): Control Tube · cracked · Jul 6, 2009 · Bell 206L1 · Main Rotor Control
  > (CAN) THE HELICOPTER TRANSMISSION HAD BEEN REMOVED WITH THE FLIGHT CONTROL SUPPORT INTACT AND WAS ON THE BENCH IN THE O/H SHOP. A TECH THAT WAS INSPECTING THE CONDITION OF THE TRANSMISSION AND ATTACHED FLIGHT CONTROLS NOTICED THE CRACKED PART. THERE WERE 2 C
- [SDR CA090325008](https://openairdocs.org/sdr/CA090325008.md): Bolt · failed · Mar 23, 2009 · Bell 206L1 · Fuselage Main, Structure
  > MEDIUM DENSITY MAGNETOMETER SURVEY ARRAY WAS INSTALLED ON THE SUBJECT AIRCRAFT PER STC SH03-32 FOR A SURVEY BEING PERFORMED. WHILE FLYING ON SURVEY ON MARCH 23, 2009, THE PILOT AND OPERATOR HEARD A BANG AND THE PILOT NOTICED A VIBRATION FROM THE ARRAY BOOM ST
- [SDR CA081001007](https://openairdocs.org/sdr/CA081001007.md): Check Valve · dirty · Oct 1, 2008 · Bell 206L1 · Aircraft Fuel Filter/Strainer
  > (CAN) AFTER A FUEL FILTER REPLACEMENT A 2 MINUTE RUN IS REQUIRED WITH BOOST PUMPS OFF TO ENSURE THERE ARE NO AIR LEAKS IN THE FUEL SYS. DURING THIS 2 MINUTE GROUND RUN THE ENG FLAMED OUT AFTER APP 90 SECONDS INDICATING AN AIR LEAK. FUEL SYS INSPECTED AND THE
- [SDR CA080528003](https://openairdocs.org/sdr/CA080528003.md): Ring · cracked · May 23, 2008 · Bell 206L1 · Rotorcraft Tail Boom
  > (CAN) CRACK FOUND ON TAIL BOOM RING DURING ROUTINE INSPECTION.
- [SDR CA080528004](https://openairdocs.org/sdr/CA080528004.md): Fitting · cracked · May 23, 2008 · Bell 206L1 · Fuselage Structure (General)
  > (CAN) CRACK DETECTED ON FITTING DURING ROUTINE INSPECTION.
- [SDR CA080521002](https://openairdocs.org/sdr/CA080521002.md): Bearing · cracked · May 13, 2008 · Bell 206L1 · Tail Rotor Blades
  > (CAN) DURING THE 100 HR INSP A SMALL CRACK WAS FOUND ON THE INBD FEATHERING BEARING ON ONE OF THE TAIL ROTOR BLADES. CRACK WAS NOTICED AS A BLACK LINE AT THE TOP OF THE BEARING. THIS IS A CRACK THAT WAS QUITE COMMON 10-15 YEARS AGO AND SEEMS TO HAVE RESURFACE
- [SDR EVCA200804118](https://openairdocs.org/sdr/EVCA200804118.md): Link · broken · Apr 10, 2008 · N89AE · Bell 206L1 · Main Rotor Transmission Mount
  > FAILURE OF THE LT REAR TRANSMISSION LINK IN FLIGHT. HEARD NOISE AUTOROTATION TO A SAFE LANDING IN FIELD. INVESTIGATION SHOWED THE LINK HAD SEPARATED, TRANS UP STOP HELD.
- [SDR EVCA200841008](https://openairdocs.org/sdr/EVCA200841008.md): Link · broken · Apr 10, 2008 · N89AE · Bell 206L1 · Main Rotor Transmission Mount
  > FAILURE OF THE LT REAR TRANSMISSION LINK IN FLIGHT. HEARD NOISE AUTOROTATION TO A SAFE LANDING IN FIELD. INVESTIGATION SHOWED THE LINK HAD SEPARATED, TRANS UP STOP HELD.
- [SDR EVCA200804108](https://openairdocs.org/sdr/EVCA200804108.md): Link · broken · Apr 10, 2008 · N89AE · Bell 206L1 · Main Rotor Transmission Mount
  > FAILURE OF THE LT REAR TRANSMISSION LINK IN FLIGHT. HEARD NOISE AUTOROTATION TO A SAFE LANDING IN FIELD. INVESTIGATION SHOWED THE LINK HAD SEPARATED, TRANS UP STOP HELD.
- [SDR CA071001010](https://openairdocs.org/sdr/CA071001010.md): Bearing Race · cracked · Sep 22, 2007 · Bell 206L1 · Tail Rotor Blades
  > (CAN) PILOT REPORTED AN INCREASE OF FORCE REQUIRED TO PUSH THE T/R PEDALS AT 100 PERCENT RPM WHICH EXCEEDED THE OPERATIONAL LIMITS. HOWEVER, AT ZERO RPM THE FORCE WAS NORMAL. IT WAS DETERMINED THAT THE CAUSE WAS ASSOCIATED WITH THE T/R FEATHERING BEARINGS. I
- [SDR 75408212007](https://openairdocs.org/sdr/75408212007.md): Unknown · odor · Aug 21, 2007 · N485EC · Bolkms BO105S · Air Distribution System
  > FUEL ODOR NOTICEABLE AFTER TAKEOFF. THE AIRCRAFT RETURNED TO BASE. MAINTENANCE INSPECTED BELLY, SUMP DRAINS, AND DRAIN PORTS, FOUND NO EVIDENCE OF LEAKS. ALSO, THE MECHANIC INSPECTED BOTH ENGINES FOR EVIDENCE OF FUEL LEAKS, FOUND NONE. MAINTENANCE OPERATIO
- [SDR CA070822006](https://openairdocs.org/sdr/CA070822006.md): Transmission · making metal · Aug 20, 2007 · Bell 206L1 · Main Rotor Gearbox
  > (CAN) SHORTLY AFTER TAKEOFF THE PILOT RECEIVED A CHIP LIGHT ON THE TRANSMISSION. LANDED THE AIRCRAFT. METAL WAS DISCOVERED ON THE SENSOR. THE AIRCRAFT WAS REMOVED FROM SERVICE AND THE TRANSMISSION WAS REPLACED WITH A SERVICEABLE UNIT. AIRCRAFT RETURNED TO SE
- [SDR CA070926002](https://openairdocs.org/sdr/CA070926002.md): Indicator · fluctuates · Jul 26, 2007 · Bell 206L1 · Engine Oil Indicating System
  > (CAN) THE AC WAS DEPARTING FROM BASE WHEN IT WAS NOTICED THAT THE ENGINE OIL PRESSURE INDICATOR WAS FLUCTUATING. THE PILOT RADIO A PAN TO ATC AND DID A PRECAUTIONARY LANDING. NO INCIDENT ON LANDING. THE ENGINEER WAS DISPATCHED TO THE LANDING SITE AND IT WAS DE
- [SDR YTRR116739](https://openairdocs.org/sdr/YTRR116739.md): Fuel Filter · clogged · Jul 22, 2007 · N598RL · Bell 206L1 · Aircraft Fuel Filter/Strainer
  > FUEL FILTER IMPENDING BYPASS SWITCH KEPT ILLUMINATING CAUTION LIGHT. ON INSPECTION OF FILTER NO CLOGGING WAS NOTED. FILTER WAS REPLACED AND BYPASS LIGHT ILLUMINATED AGAIN. FILTER HOUSING WAS REPLACED AND DISCREPANCY WAS CLEARED.
- [SDR HEER117233](https://openairdocs.org/sdr/HEER117233.md): Bearing · separated · Jun 11, 2007 · N2249Z · Bell 206L1 · Tail Rotor Drive Shaft
  > DURING A DAILY INSPECTION TECHNICIAN FOUND BEARING CAGE SEPARATED AT THE RIVETS. ALSO FOUND SEALS OUT OF THEIR RESPECTIVE RETENTION GROOVES. REQUEST THAT SHAFT ASSY BE SENT TO MFG FOR EVALUATION TO FILAB. REPLACED SHAFT ASSY WITH NEW.
- [SDR CM2R747K](https://openairdocs.org/sdr/CM2R747K.md): Bellcrank · broken · May 1, 2007 · N397R · Cessna 340A · Elevator Control System
  > BEARING AND BOLT FAILED IN THE ELEVATOR BELLCRANK P/N 5360801-4. CENTER BEARING THAT SUPPORTS THIS BELLCRANK FAILED. BEARING IS P/N MS27640-4. BOLT P/N AN4-14 WAS SEVERELY WORN AND BROKEN IN TWO. IF EITHER END OF THE BOLT SLIPPED OUT OF THIS BELLCRANK, TH
- [SDR CA070105004](https://openairdocs.org/sdr/CA070105004.md): Combustion Case · cracked · Jan 5, 2007 · Bell 206L1 · Turbine Engine Combustion Section
  > (CAN) DURING A 200 HR INSPECTION A CRACK WAS FOUND IN THE ARM PIT AREA OF THE OUTER COMBUSTION CASE. CASE REPLACED. (TC NR 20070105004)
- [SDR CA070105005](https://openairdocs.org/sdr/CA070105005.md): Impeller · cracked · Jan 5, 2007 · Bell 206L1 · Engine Oil Cooler
  > (CAN) 300 HR NDT FOUND CRACKS IN THE WEB AREA. PART REPLACED. (TC NR 20070105005)
- [SDR CA061207004](https://openairdocs.org/sdr/CA061207004.md): Oil Cooler · leaking · Dec 7, 2006 · Bell 206L1 · Engine Oil Cooler
  > (CAN) ON AIRCRAFT RETURNING TO BASE IT WAS NOTED THAT THERE WAS OIL ON THE TAILBOOM. ON INVESTIGATION THE SOURCE OF THE OIL WAS FOUND TO BE THE OIL COOLER. COOLER CHANGED. (TC NR 20061207004)
- [SDR CA061124011](https://openairdocs.org/sdr/CA061124011.md): Collector · cracked · Nov 14, 2006 · Bell 206L1 · Engine Collector/Tailpipe/Nozzle
  > (CAN) DURING ENGINE MAINTENANCE, THE HORIZONTAL FIRESHIELD WAS REMOVED AND (2) CRACKS WERE NOTED AT THE 5 O`CLOCK AND 7 O`CLOCK POSTION IN THE EXHAUST COLLECTOR. TURBINE REMOVED REPAIRED RE-INSTALLED. (TC NR 20061124011)
- [SDR HEEA109567](https://openairdocs.org/sdr/HEEA109567.md): Engine · malfunctioned · Jun 1, 2006 · N5007N · Bell 206L1 · Engine (Turbine/Turboprop)
  > DURING CLIMB OUT AT APPROXIMATELY 400 FEET, 60 KNOTS, AND 80 TORQUE HEARD A LOUD BANG THAT CAME FROM THE REAR OF THE HELICOPTER. THIS WAS FOLLOWED BY A SLIGHT LEFT YAW AND A RAPID LOSS OF ROTOR RPM. AN AUTOROTATION WAS ACCOMPLISHED. DURING THE DECENT THE T
- [SDR CA060504008](https://openairdocs.org/sdr/CA060504008.md): Blade · out of tolerance · May 3, 2006 · Bell 206L1 · Tail Rotor Blades
  > THE BLADE WAS SENT TO ROTOR BLADES INCORPORATED FOR INSPECTION AS REQUIRED BY ASB 206L-04-127 REVISION C PART 3 AND BY AD CF-2004-05R1 PART D. ROTOR BLADES INCORPORATED HAS REPORTED THAT THE BLADE HAS FAILED THE INSPECTION AND IS BELOW TOLERANCE. THE BLADE IS
- [SDR CA060403010](https://openairdocs.org/sdr/CA060403010.md): Tube · broken · Mar 26, 2006 · Bell 206L1 · Turbine Engine Compressor Section
  > PILOT HEARD A BIG "BANG" FROM ENGINE AND LOST POWER. THE PILOT LANDED IN THE BUSH WITHOUT DAMAGING THE A/C. AFTER THE INSPECTION OF THE COMPRESSOR BY THE MECHANIC, FOUND THE COMPRESSOR IN BAD SHAPE, CONFIRMED FOD WAS IN TO THE COMPRESSOR. MECHANIC CHECKED A
- [SDR CA060227005](https://openairdocs.org/sdr/CA060227005.md): Support · cracked · Feb 24, 2006 · Engine Mount Section
  > ON REMOVAL OF TURBINE SECTION FROM ENGINE ASSY ONE OF THE FWD SUPPORT STUTS WAS FOUND TO BE CRACKED. TURBINE ASSY SENT FOR REPAIR. RECOMMEND BETTER VISUAL INSPECTIONS ON SCHEDUELED INSPECTIONS AND POSSIBLY VIBRATION CHECKS.
- [SDR CA060120002](https://openairdocs.org/sdr/CA060120002.md): Bearing Race · corroded · Jan 17, 2006 · Bell 206L1 · Main Rotor Head
  > (CAN) ON A SCHEDULED 1200 HR M/R CORROSION INSPECTION THE INNER RACE OF THE M/R TRUNNION BEARING WAS FOUND TO BE SEVERLY CORRODED TO THE POINT THAT THE INNER RACE WAS CRACKED. THIS BEARING RACE IS THERMALLY PRESS FIT AND THE TIGHT TOLLERANCE, SEVERE CORROSION
- [SDR ALG2006F00006](https://openairdocs.org/sdr/ALG2006F00006.md): Engine · flamed out · Jan 4, 2006 · N2759N · Cessna STC206C · Engine (Turbine/Turboprop)
  > ON FIRST START OF THE DAY, ENGINE FLAMED OUT. THIS EVENT WAS FOLLOWED BY 2 MORE FAILED START ATTEMPTS. MAINTENANCE INSPECTED THE ENGINE AND ASSOCIATED SYSTEMS WITH NO DEFECTS NOTED. THE FUEL NOZZLE WAS RESHIMED. AFTER 2 SUCCESSFUL STARTS THE AIRCRAFT WAS R
- [SDR CA060105003](https://openairdocs.org/sdr/CA060105003.md): Mast · making metal · Dec 8, 2005 · Bell 206L1 · Main Rotor Mast/Swashplate
  > M/R MAST WAS REPLACED 4 HOURS PREVIOUSLY. PILOT HAD A TRANSMISSION CHIP LIGHT AND NOTIFIED TOWER OF LANDING DUE TO A MX PROBLEM. ENGINEER INSPECTED F/W, TRANSMISSION, AND MAST CHIP DETECTORS. FOUND HAIR LIKE SLIVER ON THE UPPER MAST BRG CHIP DETECTOR AND ON
- [SDR ALG2005F00081](https://openairdocs.org/sdr/ALG2005F00081.md): Lens · missing · Oct 19, 2005 · N3190P · Bell 206L1 · Exterior Lighting
  > IN CRUISE FLIGHT, FELT BUMP IN T/R PEDALS, UPON LANDING, NOTIFIED MAINTENANCE. INSPECTION OF AIRCRAFT BY MAINTENANCE FOUND THE UPPER WHITE STROBE LENS MISSING AND DAMAGE TO ONE TAIL ROTOR BLADE. INSTALLED NEW WHITE LENS AND REPLACED THE T/R ASSY WITH A SERVI
- [SDR ALG2005F00082](https://openairdocs.org/sdr/ALG2005F00082.md): Beam · elongated · Oct 19, 2005 · N3186P · Bell 206L1 · Main Rotor Transmission Mount
  > IN CRUISE FLIGHT, PILOT HEARD A NOISE IN THE AIRFRAME. UPON LANDING NOTIFIED MAINTENANCE. INSPECTION OF AIRCRAFT BY MAINTENANCE FOUND THE RT NOODLE BEAM ARM ASSY HOLES ELONGATED AT WEIGHT BOLTS. REMOVED AND REPLACED ARM ASSY WITH SERVICEABLE UNIT IAW MM. (
- [SDR CA051005004](https://openairdocs.org/sdr/CA051005004.md): Fitting · cracked · Oct 4, 2005 · Bell 206L1 · Rotorcraft Tail Boom
  > (CAN) CRACKED FITTING ON TAILBOOM PN 206-033-004-045 AFMA FITTING P/N 206-031-403-005
- [SDR ALG2005F00076](https://openairdocs.org/sdr/ALG2005F00076.md): Transmission · making metal · Sep 17, 2005 · N3188P · Bell 206L1 · Main Rotor Gearbox
  > DURING CRUISE FLIGHT, TRANSMISSION CHIP LIGHT ILLUMINATED. PILOT LANDED ASAP AND PERFORMED CHIP PLUG CHECK IAW THE OPS MANUAL PROCEDURE, WHILE IN COMMUNICATION WITH MAINTENANCE. UPON COMPLETION OF 30 MINUTE PENALITY RUN AND LEAK CHECK, AC WAS FLOWN. MAINTEN
- [SDR CA051003011](https://openairdocs.org/sdr/CA051003011.md): Clip · disconnected · Sep 16, 2005 · Bell 206L1 · Turbine Governor
  > (CAN) DURING DESCENT, CNTRL N2 SPEED W/ACTUATOR TRIM SWITCH, PILOT (BEEPED) N2 SPEED DOWN. N2 SPEED REDUCED BELOW LIMITS, APPROX 70 PERCENT. AT THIS N2 SPEED ENG IS UNABLE TO PRODUCE REQUIRED PWR FOR NML OPS. PILOT ATTEMPTED TO (BEEP) N2 SPEED UP, GOV DID NOT
- [SDR CA051003003](https://openairdocs.org/sdr/CA051003003.md): Bleed Valve · malfunctioned · Sep 11, 2005 · Bell 206L1 · Compressor Bleed Valve
  > (CAN) TOT RUNNING TO WARM. BLEED VALVE STICKING OPEN. BLEED VALVE CHANGE PROBLEM GOES AWAY.

Next page: https://openairdocs.org/engine/allison-250-c28b/reports.md?page=2

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
WHERE engine_model_key = '250C28B'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/allison-250-c28b/reports

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