# Service difficulty reports: Twin Commander 690C

A list on [Twin Commander 690C](https://openairdocs.org/model/twin-commander-690c.md).

Newest first. General aviation reporting is voluntary.

- [SDR NI6R202606190066](https://openairdocs.org/sdr/NI6R202606190066.md): Regulator Valve · stuck · Jun 18, 2026 · N840TW · Gulstm 690C · Air Conditioning System
  > DURING FLT, SMOKE IN CABIN, DURING SLOW CRUISE FLT OVER FIRE TRAFFIC AREA, PERFORMED QRH ITEMS, REMOVED SMOKE FROM CABIN. DEPARTED THE FTA TO KCDC LANDED WITHOUT FURTHER PROBLEMS. MX TROUBLESHOT SMOKE IN CABIN TO BE COMING FROM RT ENG. AFTER EXTENSIVE TROUBLE
- [SDR 2019FA0000249](https://openairdocs.org/sdr/2019FA0000249.md): Control Cable · severed · Aug 6, 2019 · N835CC · Gulstm 690C · Trailing Edge Flap Control System
  > LEFT INBOARD FLAP EXTEND CABLE BROKE AT INBOARD WING BELL CRANK CAUSING BOTH LEFT FLAPS TO NOT EXTEND AND CREATED ASYMMETRIC FLIGHT WHEN FLAP SWITCH WAS SELECTED IN 20 DEGREE AND 40 DEGREE DOWN POSITIONS.
- [SDR 2019F00229](https://openairdocs.org/sdr/2019F00229.md): Skin · cracked · Jun 6, 2019 · N840G · Gulstm 690C · Vertical Stabilizer, Plate/Skin
  > FOUND CRACK IN VERTICAL TAIL SKIN ABOVE "PYRAMID" IN DOUBLER. INSTALLED 5" ACCESS HOLE IN LH VERTICAL SKIN IN REFERENCE TO GTEC, INC ENGINEERING. FOUND MID SPAR CRACKED ON RH SIDE OPPOSITE OF CRACK IN SKIN. INSTALLED A DOUBLER ON THE LH AND RH FLANGE OF THE
- [SDR LCPR201405010001](https://openairdocs.org/sdr/LCPR201405010001.md): Wheel · fractured · Apr 22, 2014 · N5878K · Gulstm 690C · Wheel/Ski/Float
  > AFTER LANDING, FOUND THE NOSE WHEEL FLAT AND THE NOSE WHEEL RIM BEAD SEAT AREA LT WHEEL HALF FRACTURED.
- [SDR CA110914011](https://openairdocs.org/sdr/CA110914011.md): Seat Back · cracked · Sep 12, 2011 · Gulstm 690C · Flight Compartment Equipment
  > (CAN) DURING DESCENT, THE SEAT BACK ON THE PILOT`S SEAT BROKE AND FELL BACKWARDS. THE ACFT WAS ON AUTOPILOT SO THERE WAS NO TEMPORARY LOSS OF CONTROL. THE PILOT CONTINUED THE DESCENT AND LANDED NORMALLY. IT APPEARS TO BE A CLEAN BREAK ON THE EDGE OF THE WE
- [SDR EPDA20110804001](https://openairdocs.org/sdr/EPDA20110804001.md): Seal · leaking · Aug 4, 2011 · N74EF · Gulstm 690C · Engine Collector/Tailpipe/Nozzle
  > RT ENGINE FIRE WARNING LIGHT CAME ON DURING CLIMB AT HIGH POWER SETTING. REDUCED POWER AND LIGHT WENT OUT. RETURNED TO DEPARTURE AIRPORT, LANDING UNEVENTFUL. INSPECTION REVEALED POSSIBLE EXHAUST SEAL LEAK.
- [SDR 2011FA0000321](https://openairdocs.org/sdr/2011FA0000321.md): Scavenge Pump · failed · May 17, 2011 · N840GH · Gulstm 690C · Turbine Engine Oil System
  > PILOT REPORTED THAT THE RT ENGINE RPM ACCELERATED UNCOMMANDED FROM 98 PERCENT TO APPROXIMATELY 103.5 PERCENT MOMENTARILY, A FEW SECONDS LATER IT DID IT AGAIN AND THE PILOT ELECTED TO SHUTDOWN THE ENGINE AND LAND THE ACFT SINGLE ENGINE, HE DID SO WITHOUT INCIDE
- [SDR 2010FA0001102](https://openairdocs.org/sdr/2010FA0001102.md): Pulley · chafed · Oct 8, 2010 · N63DU · Gulstm 690C · Trailing Edge Flap Control System
  > FLAP PULLEY CHAFES FLAP BRACKET - PREVIOUSLY ADDRESSED IN BOTH AD 98-07-17 AND SB 226.
- [SDR 2010FA0000479](https://openairdocs.org/sdr/2010FA0000479.md): Scavenge Pump · dirty · Apr 10, 2010 · N844SC · Gulstm 690C · Turbine Engine Oil System
  > DURING FLIGHT, LT ENGINE OIL TEMP NEARED RED LINE BUT DID NOT GO OVER. NO OTHER ENGINE PARAMETERS HAD ANY DEFECT. THE PILOT SHUTDOWN THE LT ENGINE AS A PRECAUTION AND LANDED WITH NO OTHER INCIDENTS. MX REMOVED REAR SCAVANGE PUMP AND CLEANED OIL RESIDUE FROM
- [SDR 2010FA0000178](https://openairdocs.org/sdr/2010FA0000178.md): Terminal · burned · Dec 16, 2009 · N5878K · Gulstm 690C · Ice/Rain Protection System Wiring
  > PILOT REPORTED SMELLING SMOKE AND THEN SEEING FLAMES FROM THE RT SIDE FWD SECTION OF GLARE SHIELD. DECLARED AN EMERGENCY, FOLLOWED EMERGENCY PROCEDURES AND AFTER SHUTTING OFF THE WINDSHIELD HEAT, FLAMES EXTINGUISHED. LANDED WITHOUT INCIDENT. MX INSPECTED TH
- [SDR CA091215006](https://openairdocs.org/sdr/CA091215006.md): Piston · cracked · Dec 15, 2009 · Gulstm 690C · Landing Gear Retraction/Extension System
  > (CAN) NDT OUR LANDING GEAR AND RETRACT COMPONENTS EVERY 5 YEARS. COMPLETE AN NDT INSPECTION AT THIS TIME. DURING THIS INSPECTION, A CRACK WAS DISCOVERED. THIS IS THE SECOND OCCURRENCE OF A PISTON FOUND CRACKED IN OUR FLEET OF 4 TWIN COMMANDERS (TC NR 20091
- [SDR 2006FA0000899](https://openairdocs.org/sdr/2006FA0000899.md): Bolt · sheared · Aug 9, 2006 · N777NV · Gulstm 690C · Landing Gear Retraction/Extension System
  > DURING ROUTINE INSPECTION FOUND NOSE GEAR LOWER DRAG BRACE BOLT SHEARED AT JUNCTION OF REDUCED DIAMETER BOLT HAD NOT YET CAME OUT OF ITS BORE AND THEREFORE THE GEAR DID NOT COLLAPSE. BUT IT WAS READY TO. (K)
- [SDR 2005FA0001229](https://openairdocs.org/sdr/2005FA0001229.md): Connector · worn · Aug 3, 2005 · N835CC · Gulstm 690C · Electrical Connectors
  > PILOT REPORTED INABILITY OF "SERIES" START WITH A/C. UPON INSPECTION FOUND + PIN OF RH BATTERY BROKEN OFF IN BATTERY CONNECTOR. INSPECTED LH BATTERY FOUND + PIN WITH PARTIAL BURN INDICATION. REMOVED TOPS OF BOTH BATTERIES AND NOTED INDICATION OF HIGH HEAT AB
- [SDR 2008FA0000711](https://openairdocs.org/sdr/2008FA0000711.md): Window · cracked · Oct 3, 2004 · Gulstm 690C · Passenger Compartment Windows
  > ACFT LOST PRESSURIZATION. AFTER LANDING THE RT CABIN WINDOW WAS FOUND CRACKED. AFTER REMOVAL THE CRACK WAS FOUND TO EXTEND FROM THE TOP OF THE WINDOW INTO MOUNTING SCREW HOLE NR 22 AFT OF THE FRONT OF THE WINDOW THEN FWD 14 INCHES THROUGH 13 MOUNTING HOLES. TH
- [SDR FTU2004F00004](https://openairdocs.org/sdr/FTU2004F00004.md): Longeron · cracked · Jun 16, 2004 · N840JC · Gulstm 690C · Fuselage Main, Longeron/Stringer
  > WHILE COMPLYING WITH SB 187, ANTENNA INSPECTION AND MODIFICATION PART 1, THE LT FS 223.98 UPPER FUSELAGE FRAME CHANNEL RETURN FLANGE AT THE LT NR 1 LONGERON INTERSECTION WAS FOUND CRACKED. THE DAMAGED FRAME SECTION IS COMMON TO THE NR 1 LONGERON AND IS SHIMME
- [SDR EPD2003F00001](https://openairdocs.org/sdr/EPD2003F00001.md): Switch · failed · Jun 15, 2003 · N73EF · Gulstm 690C · Cabin Pressure Control System
  > ROCKER SWITCH WHICH CONTROLS THE AIR CONDITIONING AND THE ENVIROMENTAL FANS WAS FOUND OVERHEATED. THE SWITCH HAS LOOSE TERMINALS AND CHECK WITH HIGH RESISTANCE. THE CIRCUIT BREAKER DID NOT TRIP AND IS LOCATED IN THE AFT ELECTRICAL COMPARTMENT.
- [SDR 20001207SH015](https://openairdocs.org/sdr/20001207SH015.md): Lock · broken · Nov 27, 2000 · N840V · Gulstm 690C · Propeller Assembly
  > START-LOCK BROKE AND PIN FELL OUT BECAUSE RETAINING COTTER PIN WAS TOO WEAK. (X)
- [SDR 99ZZZX3707](https://openairdocs.org/sdr/99ZZZX3707.md): Bulkhead · cracked · Aug 27, 1999 · N67FE · Gulstm 690C · Fuselage Main, Bulkhead
  > THIS AIRCRAFT IS JUST ONE OF FOUR THIS YEAR (OF THE SAME MAKE AND MODEL) THAT HAVE HAD STC SA 8214SW FROM THE COMMANDER SERVICE CENTER (REMOVAL OF THE CLAMSHELL DOORS) THAT WERE FOUND WITH LARGE CRACKS INSIDE THE WHEELWELL ON THE AFT BULKHEAD.
- [SDR 99ZZZX2480](https://openairdocs.org/sdr/99ZZZX2480.md): Clevis · failed · Jun 17, 1999 · N840V · Gulstm 690C · Landing Gear Retraction/Extension System
  > THE LEFT MAIN LANDING GEAR INBOARD RETRACT CYLINDER CLEVIS BROKE CAUSING THE LEFT MAIN GEAR TO COLLAPSE ON LANDING. THE LEFT GEAR INBOARD EXTENSION/RETRACTION ACTUATOR IS CONNECTED TO THIS RETRACT CYLINDER CLEVIS. THIS IS THE PHYSICAL CONNECTION BETWEEN THE
- [SDR 97ZZZX2036](https://openairdocs.org/sdr/97ZZZX2036.md): Engine · low oil press · Apr 29, 1997 · N3XY · Gulstm 690C · Turbine Engine Oil System
  > UPON REACHING FL 26,000 FEET, PILOT OBSERVED OIL PRESSURE DECREASING SLOWLY. THE OIL PRESSURE HAD REACHED A LOW END RED LINE. THE PILOT ELECTED TO SHUT DOWN NR 1 ENGINE AND RETURN TO THE AIRPORT. AFTER LANDING, INVESTIGATION WAS MADE INTO OIL PRESSURE. PRE
- [SDR 96ZZZX1951](https://openairdocs.org/sdr/96ZZZX1951.md): Seal · failed · Mar 21, 1996 · N600BM · Gulstm 690C · Cabin Cooling System
  > AT 18,000 FEET, PILOT SMELLED SMOKE. CABIN TEMP WENT FULL HOT. SHUT DOWN ENVIRONMENTAL CONTROL UNIT. WHEN ON GROUND, TROUBLESHOOTING FOUND THE CARBON FACE SEAL OF THE AIR CYCLE MACHINE HAD FAILED ON THE OUTPUT SIDE ALLOWING OIL INTO THE CABIN AIR.
- [SDR 95ZZZX5250](https://openairdocs.org/sdr/95ZZZX5250.md): Skin · cracked · Aug 31, 1995 · N47TT · Gulstm 690C · Ailerons
  > DURING THE COURSE OF A 100-HOUR INSPECTION, FOUND THE LT AILERON LEADING EDGE SKIN CRACKED AT THE INBOARD MOST BALANCE WEIGHT ATTACHMENT SCREWS. THE CRACKS RANGED FROM.75 INCH TO 1.75 INCH IN LENGTH AND TOTALED 7 IN NUMBER. THERE WAS NO REPAIR FOR THIS DAMA
- [SDR 95ZZZX3089](https://openairdocs.org/sdr/95ZZZX3089.md): Indicator · leak · Mar 20, 1995 · N67FE · Gulstm 690C · Crew Oxygen System
  > OXYGEN SYSTEM LEAK. FOUND THE LEAK ON THE COPILOT'S MASK. THE FLOW INDICATOR HAS A CLEAR PLASTIC PIECE TO VIEW OXYGEN FLOW. THIS IS THE 2ND MASK FOUND IN THE PAST 2 YEARS WITH THE SAME LEAK. THERE IS A 120-DAY BACKORDER ON THIS MASK. THIS REQUIRES OPERATO

## 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 aircraft_model_key = '690C'
ORDER BY difficulty_date DESC
```

This list as a web page: https://openairdocs.org/model/twin-commander-690c/reports

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