# Service difficulty reports: Alliedsign TFE731-20BR

A list on [Alliedsign TFE731-20BR](https://openairdocs.org/engine/alliedsign-tfe731-20br.md).

Newest first. General aviation reporting is voluntary.

- [SDR BONA2026072126001](https://openairdocs.org/sdr/BONA2026072126001.md): Fire Warning · false activation · Jul 21, 2026 · N103EZ · Lear 45LEAR · Fire Detection
  > DURING CLIMBOUT AT MID 20 THOUSANDS ALTITUDE, L ENG FIRE WARNING ACTIVATED. CREW REDUCED ENGINE POWER TO IDLE AND WARNING EXTINGUISHED. CREW RETURNED FOR LANDING WITH NO FURTHER ABNORMAL INDICATIONS. CAUSE OF FIRE WARNING IS UNKNOWN AT THIS TIME.
- [SDR 2026FA0000565](https://openairdocs.org/sdr/2026FA0000565.md): Hydraulic System · abnormal · Jul 3, 2026 · N63DZ · Lear 45LEAR · Hydraulic System, Main
  > WHILE EN-ROUTE FROM KACY TO KTPA, THE FLIGHT CREW RECEIVED A WHITE MAIN HYD QTY LOW ADVISORY. APPROXIMATELY 50 MINUTES LATER, MAIN HYDRAULIC SYSTEM PRESSURE BEGAN FLUCTUATING AND SUBSEQUENTLY DECREASED STEADILY. THE CREW DIVERTED TO KJAX AND DECLARED AN EMERGE
- [SDR 2026FA0000155](https://openairdocs.org/sdr/2026FA0000155.md): Fire Warning · illuminated · Feb 27, 2026 · N454LC · Lear 45LEAR · Fire Detection
  > PILOT PERFORMED ABORTED TAKEOFF DUE ENGINE FIRE INDICATION ON THE EICAS.
- [SDR G1IA2025093026097](https://openairdocs.org/sdr/G1IA2025093026097.md): Warning Message · illuminated · Sep 26, 2025 · N435DC · Lear 45LEAR · Engine (Turbine/Turboprop)
  > ON DEPARTURE FROM KPAE TO PAKT CLIMBING THROUGH 12,000' MEDICS COMPLAINED OF BURNING SMELL, THEN SMELL WENT AWAY VERY SHORTLY AFTER. CONTINUED CLIMB AND THEN AT ABOUT FL200, GOT MASTER WARNING "RIGHT ENGINE FIRE" AND ASSOCIATED CAS MESSAGE. ACCOMPLISHED MEMORY
- [SDR G1IA202510036097](https://openairdocs.org/sdr/G1IA202510036097.md): Engine · warning message · Sep 26, 2025 · N435DC · Lear 45LEAR · Engine (Turbine/Turboprop)
  > ON DEPARTURE FROM KPAE TO PAKT CLIMBING THROUGH 12,000' MEDICS COMPLAINED OF BURNING SMELL, THEN SMELL WENT AWAY VERY SHORTLY AFTER. CONTINUED CLIMB AND THEN AT ABOUT FL200, GOT MASTER WARNING RIGHT ENGINE FIRE AND ASSOCIATED CAS MESSAGE. ACCOMPLISHED MEMORY I
- [SDR 2025F00170](https://openairdocs.org/sdr/2025F00170.md): Packing · worn · Jul 29, 2025 · N758A · Lear 45LEAR · Turbine Engine Oil System
  > LOSS OF OIL PRESSURE IN LEFT ENGINE, MID FLIGHT, LEADING TO PRECAUTIONARY ENGINE SHUTDOWN
- [SDR 2023F00244](https://openairdocs.org/sdr/2023F00244.md): Duct · bypassing · Aug 1, 2023 · N823HM · Lear 45LEAR · Engine Bleed Air System
  > RT ENGINE PYLON BLEED OVERHEAT, TROUBLE SHOT TO A LEAKING FLEX COUPLING ON HP BLEED DUCT.
- [SDR 2023F00223](https://openairdocs.org/sdr/2023F00223.md): Fms · misrepaired · Jul 1, 2023 · N786CC · Lear 45LEAR · Flight Management Computing Hardware System
  > LEARJET 45 N786CC S/N 095 DLX786 WAS CLIMBING FROM 360 TO 370 AND CLEARED DIRECT TO LAS. WE SAW SMOKE COMING OUT FROM THE CENTER CONSOLE NEAR THE FMS. WE ALSO SMELLED ELECTRICAL SMOKE. WE HEARD A POP AND THE FMS IMMEDIATELY FAILED. WE DECLARED AN EMERGENCY
- [SDR O2JA20230207N419](https://openairdocs.org/sdr/O2JA20230207N419.md): Not Reported · not reported · Feb 7, 2023 · N419LG · Lear 45LEAR · Hydraulic Power System
  > UPON LEVEL OFF AT FL380 ENROUTE FROM TISX TO KFXE, THE EICAS SYSTEM ALERTED THE CREW TO A WHITE “MAIN HYD QTY LO” MESSAGE. THE CREW PERFORMED CHECKLIST WHICH REQUIRED NO ITEMS TO BE PERFORMED AND ADVISED THAT THE FLUID QUANTITY IN THE MAIN HYDRAULIC SIDE OF TH
- [SDR G1IA2021070416015](https://openairdocs.org/sdr/G1IA2021070416015.md): Bearing · failed · Jun 16, 2021 · N1925B · Lear 45LEAR · AC Generator-Alternator
  > IN-FLIGHT FAILURE OF L GENERATOR AND MULTIPLE COMPONENTS ASSOCIATED WITH L SIDE AIRCRAFT ELECTRICAL SYSTEM RESULTING IN A PRECAUTIONARY LANDING
- [SDR 2021FA0000097](https://openairdocs.org/sdr/2021FA0000097.md): Line · leaking · Apr 8, 2021 · N395WB · Lear 45LEAR · Hydraulic System, Main
  > COMPLETE IN-FLIGHT HYDRAULIC FAILURE REPORTED BY THE FLIGHT CREW. PERFORMED PRE-INSPECTION AND NOTICED HYDRAULIC FLUID LEAK AT RIGHT PYLON PANEL. REMOVED PANEL AND DISCOVERED HYDRAULIC PRESSURE LINE LEAKING. REMOVED AND REPLACED RIGHT PYLON HYDRAULIC PRESSURE
- [SDR 2021F00050](https://openairdocs.org/sdr/2021F00050.md): O-Ring · cut · Mar 10, 2021 · N145MW · Lear 45LEAR · Turbine Engine Oil System
  > CREW REPORTED A LOSS OF OIL PRESSURE IN LEFT ENGINE DURING CRUISE FLIGHT. CREW REVIEWED THE WITH EMERGENCY ENGINE SHUTDOWN CHECKLIST WHEN OIL PRESSURE DECAYED INTO THE YELLOW ZONE. AS SOON AS THE OIL PRESSURE REACHED THE RED ZONE, THE ENGINE WAS VOLUNTARILY SH
- [SDR 2020F00324](https://openairdocs.org/sdr/2020F00324.md): Seal · torn · May 1, 2020 · N435DC · Lear 45LEAR · Engine Bleed Air System
  > AFTER DEPARTURE AND DURING CLIMB "L ENG PYLON OVHT" ILLUMINATED IN RED ON CREW WARNING PANEL (CWP) AND IN RED ON CREW ALERTING SYSTEM (CAS). THE APPROPRIATE EMERGENCY PROCEDURES IN THE AIRPLANE FLIGHT MANUAL (ANTI-ICE TURNED OFF AND THRUST LEVER RETARDED) WERE
- [SDR 9JLA2020042200000](https://openairdocs.org/sdr/9JLA2020042200000.md): Acm · seized · Apr 22, 2020 · N612YM · Lear 45LEAR · Cabin Cooling System
  > PIC REPORTED WHEN APU STARTED AND ACM COMMANDED ON THE COCKPIT FILLED WITH SMOKE. COMPLIED WITH REMOVAL AND REPLACMENT OF AIR CYCLE MACHINE TURBINE. UPON FURTHER INSPECTION FOUND NO FURTHER DAMAGE TO AIRCRAFT AND PILOT REPORTS NO INJURIES TO CREW.
- [SDR MXIA201612160142](https://openairdocs.org/sdr/MXIA201612160142.md): Muffler · ruptured · Dec 13, 2019 · N189PP · Lear 45LEAR · Pneumatic Distribution System
  > AIRCRAFT N189PP, LEAR 45 S/N 264, DEPARTED FROM KRIC ON DECEMBER 13 AT APPROXIMATELY 4:00 PM EASTERN STANDARD TIME. SHORTLY AFTER REACHING CRUISE ALTITUDE OF 40,000 FEET THERE WAS A LOUD POP FOLLOWED BY A SUDDEN LOSS OF PRESSURIZATION. AN EMERGENCY WAS DECLARE
- [SDR 9PMA2020042700005](https://openairdocs.org/sdr/9PMA2020042700005.md): Brushes · worn · Sep 25, 2019 · N183TF · Lear 45LEAR · AC Generator-Alternator
  > PIC REPORTS NO.1 ALTERNATOR FAIL CASS MESASAGE APPEARED ON LANDING INTO KAUS. AIRCRAFT LANDED WITH NO INCIDENT OR DAMAGE. UPON FURTHER INSPECTION FOUND NO. 1 ALTERNATOR BRUSHES WORN CAUSING FAILURE.
- [SDR T6FA2019092300000](https://openairdocs.org/sdr/T6FA2019092300000.md): Controller · malfunctioned · Sep 18, 2019 · N455NJ · Lear 45LEAR · Cabin Pressure Controller
  > EXPERIENCED A LOSS OF PRESSURIZATION AT 43000 FT. CABIN BEGAN CLIMBING AT 900-1000 FT/MIN. EMERGENCY PRESSURE AUTOMATICALLY ACTIVATED AND CREW EXECUTED AN EMERGENCY DESCENT AND DIVERTED TO TERRA HAUTE (KHUF).
- [SDR 9PMA2020042700000](https://openairdocs.org/sdr/9PMA2020042700000.md): Control Unit · intermittent · Jul 22, 2019 · N183TF · Lear 45LEAR · Trailing Edge Flap Control System
  > PIC REPORTS "FLAP FAULT" AND "FLAP FAIL" INDICATIONS SHOWN. TROUBLE SHOT AND FOUND FLAP CONTROL UNIT INTERMITTENTLY INOP. CAUSING MISCOMPARE IN FLAP POSITION. NO DAMAGE CAUSED TO AIRCRAFT AND NO INJURY TO CREW OR PASSENGERS.
- [SDR J7SA201812189001](https://openairdocs.org/sdr/J7SA201812189001.md): Line · leaking · Nov 29, 2018 · N471FX · Lear 45LEAR · Turbine Engine Oil System
  > DIVERTED DUE TO RT ENG OIL PRESSURE BOXED RED AT 46 PSI AND RT LOW OIL PRESS RED CASS IN DECENT THROUGH FL360. THROTTLE RETARDED TO IDLE AS OIL PRESS CONTINUED TO DECREASE. A PRECAUTIONARY ENGINE SHUTDOWN ACCOMPLISHED PER QRH AS OIL PRESSURE CONTINUED TO DECRE
- [SDR G1IA201808240001](https://openairdocs.org/sdr/G1IA201808240001.md): Splice Plate · corroded · Aug 21, 2018 · N126EC · Lear 45LEAR · Fuselage Main, Structure
  > DURING WING, STAB HEAT TROUBLESHOOTING, MAINTENANCE DISCOVERED AN AREA OF CORROSION ON THE LOWER CENTER WING SPLICE PLATE AFT OF THE REAR WING CARRY THRU JUST INBOARD OF THE RH KEEL BEAM. AFTER CONTACTING BOMBARDIER ENGINEERING AND WHILE BEGINNING CORROSION RE
- [SDR E07A201804020001](https://openairdocs.org/sdr/E07A201804020001.md): Pump · worn · Mar 29, 2018 · N960AS · Lear 45LEAR · Turbine Engine Oil System
  > DURING CRUISE FLIGHT, THE CREW RECEIVED A RT ENGINE LOW PRESSURE WARNING. IAW PROCEDURES, THE RT ENGINE WAS THROTTLED BACK TO IDLE AND ENGINE MAINTENANCE MINIMUM PRESSURE. AIRCRAFT DIVERTED. MAINTENANCE REPLACED THE RT ENGINE DRIVE OIL PUMP IAW SB TFE731-
- [SDR CA180207028](https://openairdocs.org/sdr/CA180207028.md): Bearing · failed · Feb 6, 2018 · Lear 45LEAR · Starter-Generator
  > (CAN) THE PILOTS WERE TAXIING OUT TO THE RUNWAY TO TAKE OFF WHEN THEY GOT A L GEN FAIL CAS MESSAGE ALONG WITH A VIBRATION FROM THE LT ENGINE. BOMBARDIER SERVICE TEAM WAS DISPATCHED AND THEY FOUND THAT THE LT GENERATOR HAD FAILED INTERNALLY. THE GENERATOR WAS
- [SDR 2017FA0000565](https://openairdocs.org/sdr/2017FA0000565.md): Actuator · faulted · Nov 6, 2017 · N979DR · Lear 45LEAR · Landing Gear Door Retract Section
  > AFTER NORMAL TAKEOFF AT POSITIVE RATE OF CLIMB, ON GEAR RETRACTION THE LT GEAR TRANSITION LIGHT REMAINED ON WITH HANDLE IN UP POSITION. SELECTED GEAR DOWN, FOLLOWED GEAR DOWN CHECKLIST WITH ALL GOOD INDICATION WITH HANDLE IN DOWN POSITION. MAINTAINED 4000
- [SDR PRIA20170725001](https://openairdocs.org/sdr/PRIA20170725001.md): Wire Harness · shorted · Jul 24, 2017 · N454AJ · Amd FALCON900B · Powerplant System Wiring
  > CRUISE ALTITUDE FL410 ENG NR 1 COMPUTER LIGHT ILLUMINATED WITH SLIGHT RPM ROLLBACK. FOLLOWED CHECKLIST, RESETTING COMPUTER. 30 SECONDS LATER REPEAT OCCURRENCE. FOLLOWED CHECKLIST AGAIN AND CONTINUED FLIGHT WITH COMPUTER OFF AND IN MANUAL MODE. DECIDED TO LAND
- [SDR JKIA2017070300001](https://openairdocs.org/sdr/JKIA2017070300001.md): Unknown · malfunctioned · Jul 1, 2017 · N99NJ · Lear 45LEAR · Cabin Pressure Control System
  > CRUISING AT 410 CABIN JUMPED TO 10,000 EMERGENCY PRESSURE AMBER CAS MESSAGE CAME ON AND CABIN WAS STILL CLIMBING. EMERGENCY DECENT PER QRH, DIVERTED INTO KJAX.
- [SDR JKIA2017060500001](https://openairdocs.org/sdr/JKIA2017060500001.md): Hydraulic Line · broken · Jun 5, 2017 · N95VS · Lear 45LEAR · Hydraulic System, Main
  > COMPLETE HYDRAULIC PRESSURE LOSS, LEFT AND RIGHT SYSTEMS. FOUND LEFT MAIN LANDING GEAR RETRACT ACTUATOR PRESSURE LINE LEAKING (BROKEN HOSE).
- [SDR EBVR20170328001](https://openairdocs.org/sdr/EBVR20170328001.md): Hydraulic Line · chafed · Mar 28, 2017 · N725BH · Lear 45LEAR · Hydraulic System, Main
  > DURING ROUTINE ENGINE CHANGE, A VISUAL INSPECTION OF COMPONENTS REVEALED THAT THE RT ENGINE HYDRAULIC PRESSURE LINE WAS LOOSE AT THE PYLON. THE JAMB NUT WAS NOT TIGHTENED CORRECTLY, ALLOWING THE LINE TO CHAFFE IN TO THE SKIN OF THE PYLON SKIRT. THERE WAS NO DA
- [SDR 9GEA20170215002](https://openairdocs.org/sdr/9GEA20170215002.md): Ecu · faulty · Feb 10, 2017 · N146XL · Lear 45LEAR · Fuel Control/Turbine Engines
  > ENGINE POWER ROLLED BACK. AFTER A NORMAL TAKEOFF AND WHILE CRUISING AT 26,000 FEET, WITHOUT ANY INDICATIONS OF SOMETHING GOING WRONG, THE RT ENGINE ROLLED BACK, OR THE ENGINE’S POWER WAS REDUCED WITHOUT ANY PILOT’S INPUTS. N1 & N2 STILL TURNING OR ROTATING AND
- [SDR CVGA20161212001](https://openairdocs.org/sdr/CVGA20161212001.md): O-Ring · leaking · Dec 8, 2016 · N4DA · Lear 45LEAR · Turbine Engine Oil System
  > NR 1 ENGINE LOSS OF OIL PRESSURE INFLIGHT. ENGINE SHUTDOWN. RESIDUAL OIL WAS FOUND ON BOTTOM OF ENGINE AND DOWN OIL FILLER TUBE. FOUND OIL FILLER TUBE CAP O-RING BROKEN/TORN.
- [SDR E07A961AS](https://openairdocs.org/sdr/E07A961AS.md): Pump · defective · Aug 21, 2016 · N497AS · Lear 45LEAR · Turbine Engine Oil System
  > CREW NOTICED SLOW DROP IN OIL PRESSURE ON LH ENGINE DURING DECENT AND APPROACH. AIRCRAFT LANDED WITHOUT INCIDENT. INSTALLED OVERHAULED OIL PUMP AND AIRCRAFT WAS RETURNED TO SERVICE FOLLOWING GROUND RUN AND LEAK CHECK.
- [SDR XMEA201606230001](https://openairdocs.org/sdr/XMEA201606230001.md): Sensing Element · shorted · Jun 15, 2016 · N599TA · Lear 45LEAR · Fire Detection
  > ON CLIMBOUT, AT APPROXIMATELY FL200, THE RT ENGINE FIRE LIGHT ILLUMINATED. POWER WAS REDUCED ON THE AFFECTED ENGINE AND THE LIGHT EXTINGUISHED. ACFT RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. THERE WAS NO ACTUAL FIRE. TROUBLESHOOTING DETERMINED THE RT
- [SDR J7SA2015051152116](https://openairdocs.org/sdr/J7SA2015051152116.md): Pdu · leaking · May 6, 2015 · N625FX · Lear 45LEAR · Trailing Edge Flap Control System
  > SHORTLY AFTER TAKEOFF, CREW EXPERIENCED, MAIN HYD QTY LO, CAS MSG. DURING APPROACH, AFTER SELECTING FLAPS 8 FOR LANDING, CREW RECEIVED MAIN HYD PRESS CAS. DECLARED EMER & LANDED WITHOUT INCIDENT. CREW HAD BRAKE AUTHORITY DURING LANDING. ON POST FLIGHT CREW
- [SDR 2015FA0000165](https://openairdocs.org/sdr/2015FA0000165.md): Landing Gear · inoperative · Apr 29, 2015 · N209MD · Lear 45LEAR · Landing Gear Retraction/Extension System
  > LANDING GEAR WILL NOT RETRACT.
- [SDR 6RX2015FA0000085](https://openairdocs.org/sdr/6RX2015FA0000085.md): Fire Warning · false activation · Mar 1, 2015 · N821LC · Lear 45LEAR · Fire Detection
  > APPARENT LIGHTNING STRIKE CAUSED ENGINE FIRE WARNING TO ACTIVATE. THE WARNING WOULD NOT RESET. SUBSEQUENT ENGINE SHUTDOWN HAD NO AFFECT ON WARNING. BOTH ENGINE FIRE EXTINGUISHERS WERE DISCHARGED. FIRE WARNING STILL INDICATED. DECLARED EMERGENCY, LANDED UN
- [SDR 9JLA201410137931](https://openairdocs.org/sdr/9JLA201410137931.md): Warning Light · illuminated · Sep 15, 2014 · N918DG · Lear 45LEAR · Engine Indicating System
  > AFTER DEPARTURE AT ABOUT 10,000FT WHEN THE CREW NOTED THAT THE RT ENGINE ITT INDICATION WAS JUST ABOVE THE NORMAL OPERATING RANGE & WAS INCREASING. ATTEMPTED TO CONTROL THE ENG ITT WITH DIFFERENT POWER SETTINGS. THE ITT THEN ROSE ABOVE THE READINGS ON THE IN
- [SDR WCEA2014FA0000454](https://openairdocs.org/sdr/WCEA2014FA0000454.md): Controller · malfunctioned · Jul 29, 2014 · N777QL · Lear 45LEAR · Cabin Pressure Controller
  > PRIOR TO FLIGHT, THE PRESSURIZATION CONTROLLER HAD BEEN CHANGED DUE TO FAILURE AND A REPAIRED UNIT INSTALLED IAW MM, 21-30-03. ALL OPS CHECKS PERFORMED WITH NO DISCREPANCIES NOTED. PREPARED FOR DEPARTURE WITH NO DISCREPANCIES. 30 MINUTES INTO FLIGHT, NOTICE
- [SDR 9JLA2013121203729](https://openairdocs.org/sdr/9JLA2013121203729.md): Controller · defective · Dec 10, 2013 · N556CG · Lear 45LEAR · Air Conditioning System
  > THE FLIGHT CREW REPORTED THAT THE LT BLEED AIR SYS FAILED IN FLIGHT. AFTER LANDING THE SYS WAS TROUBLESHOT & THE ENVIRONMENTAL CONTROL SYSTEM CONTROLLER PN 6636108500-3, SN 0330108 WAS FOUND TO BE DEFECTIVE. THE UNIT WAS R & R WITH A REPAIRED ECS. FUNCTIONAL
- [SDR CA130919002](https://openairdocs.org/sdr/CA130919002.md): Fan · failed · Sep 14, 2013 · Lear 45LEAR · Turbine Engine Air Inlet Section
  > (CAN) CREW REPORTED ENGINE VIBRATION, DURING VISUAL INSPECTION FOUND FAN CASE ABRADABLE MATERIAL WORN OUT. (TC# 20130919002)
- [SDR CA120309002](https://openairdocs.org/sdr/CA120309002.md): Boot · deteriorated · Mar 8, 2012 · Lear 45LEAR · Nacelle/Pylon, Bulkhead/Firewall
  > (CAN) RT ENGINE PYLON OVERHEAT, RED EICAS MESSAGE. FOUND RT PYLON FIREWALL BOOT SEAL, IPC 78-31-15, ITEM NR 32, TO BE DETERIORATED, FLAKING, BRITTLE AND LEAKING HOT AIR FROM N1 FAN BYPASS DUCT INTO PYLON, ONTO PYLON OVERHEAT DUCT SENSOR. FAN BYPASS DUCT AIR

## 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 = 'TFE73120BR'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/engine/alliedsign-tfe731-20br/reports

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