# Service difficulty reports: N91S, cancelled Sep 21, 1999 A list on [N91S, cancelled Sep 21, 1999](https://openairdocs.org/deregistered/N91S-1999-09-21.md). Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. Newest first. - [SDR 9810869101](https://openairdocs.org/sdr/9810869101.md): Battery · discharged · Dec 13, 1998 · N91S · Doug DC915 · Emergency Lighting > DURING LINE CHECK, FOUND OVERHEAD EMERGENCY LIGHTS IN FIRST CLASS SECTION INOPERATIVE. MAINTENANCE REPLACED BATTERIES IN POWER SUPPLY, OPERATIONAL CHECK NORMAL. - [SDR 9809929101](https://openairdocs.org/sdr/9809929101.md): Boost Pump · failed · Aug 18, 1998 · N91S · Doug DC915 · Fuel Boost Pump > AFTER TAKEOFF, THE RIGHT AC ELECTRICAL SYSTEM FAILED CAUSING MALFUNCTION OF SEVERAL SYSTEMS AND COMPONENTS. FLIGHT WAS RETURNED TO ICT AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND RIGHT AFT FUEL BOOST PUMP INOPERATIVE WHICH CAUSED TRIP OF A PHASE CIRCUIT B - [SDR 9808729101](https://openairdocs.org/sdr/9808729101.md): Valve · failed · May 8, 1998 · N91S · Doug DC915 · Landing Gear Retraction/Extension System > DURING CLIMBOUT, THE RIGHT MAIN LANDING GEAR UNSAFE AND DOOR OPEN LIGHTS ILLUMINATED. THE FLIGHT CREW FOLLOWED COM PROCEDURES, RECYCLED LANDING GEAR HANDLE, RETURNED TO MEM, AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE MAIN LANDING GEAR CONTROL VALV - [SDR 9808719101](https://openairdocs.org/sdr/9808719101.md): Batteries · discharged · May 8, 1998 · N91S · Doug DC915 · Emergency Lighting > DURING LINE CHECK, FOUND SEVERAL FLOOR TRACK EMERGENCY EXIT LIGHTS INOPERATIVE, EXIT LIGHTING WEAK OVER LEFT WING EXIT, AND EMERGENCY LIGHTING OUT OF SEQUENCE IN FIRST CLASS SECTION. MAINTENANCE REPLACED BATTERIES AND REARRANGED LIGHT ASSEMBLIES IN FIRST CLAS - [SDR 9808609101](https://openairdocs.org/sdr/9808609101.md): Wire · chafed · May 7, 1998 · N91S · Doug DC915 · Landing Gear System Wiring > DURING CLIMB-OUT, THE RIGHT MAIN LANDING GEAR UNSAFE LIGHT ILLUMINATED. FLIGHT CREW PERFORMED UPLATCH CHECK. AIRCRAFT LANDED AT DESTINATION WITHOUT INCIDENT. MAINTENANCE REPAIRED CHAFED WIRING AT RIGHT MAIN LANDING GEAR UPLOCK SWITCH. OPERATIONAL CHECK NOR - [SDR 9808469101](https://openairdocs.org/sdr/9808469101.md): Latch · out of adjust · May 6, 1998 · N91S · Doug DC915 · Landing Gear Retraction/Extension System > RIGHT MAIN LANDING GEAR UNSAFE LIGHT REMAINED ON AFTER GEAR RETRACTION. FLIGHT WAS RETURNED TO MEM AND LANDED WITHOUT INCIDENT. MAINTENANCE ADJUSTED RIGHT MAIN GEAR DOOR LATCH MECHANISM, OPERATIONAL CHECK NORMAL. - [SDR 9803959101](https://openairdocs.org/sdr/9803959101.md): Doubler · oversized · Feb 26, 1998 · N91S · Doug DC915 · Passenger/Crew Doors > FORWARD CABIN DOOR WOULD NOT OPEN USING INTERIOR HANDLE. MAINTENANCE FOUND DOUBLER CONTACTING HANDLE ON OUTSIDE OF DOOR. BURNISHED DOUBLER, OPERATIONAL CHECK OK. - [SDR 9720039101](https://openairdocs.org/sdr/9720039101.md): Controller · inoperative · Oct 26, 1997 · N91S · Doug DC915 · Cabin Pressure Controller > DURING CLIMBOUT, MASTER AND PRESSURE WARNING LIGHTS ILLUMINATED WHILE PASSING THROUGH 17,500 FEET. COMPLETED COCKPIT OPERATING PROCEDURES AND GAINED CONTROL OF CABIN AT 4,000 FEET. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED OUTFLOW VALVES AND R - [SDR 9715879101](https://openairdocs.org/sdr/9715879101.md): Battery · discharged · Aug 18, 1997 · N91S · Doug DC915 · Emergency Lighting > DURING INSPECTION, FOUND THE AFT SECTION OF THE FLOOR EMERGENCY ESCAPE LIGHTS INOPERATIVE. MAINTENANCE REPLACED THE BATTERIES IN THE POWER SUPPLY. - [SDR 9715649101](https://openairdocs.org/sdr/9715649101.md): Valve · malfunctioned · Aug 9, 1997 · N91S · Doug DC915 · Engine Oil Pressure > DURING TAKEOFF ROLL, THE RIGHT ENGINE OIL PRESSURE INDICATION WAS ABNORMALLY HIGH. CREW ABORTED TAKEOFF AND RETURNED TO GATE. MAINTENANCE REPLACED THE RIGHT ENGINE OIL PRESSURE REGULATOR VALVE, ENGINE OPERATIONAL CHECK OK. - [SDR 9708119101](https://openairdocs.org/sdr/9708119101.md): Floorbeam · cracked · Apr 7, 1997 · N91S · Doug DC915 · Fuselage Main, Floor Beam > DURING L-CHECK, FOUND CRACK IN FLOORBEAM AT FS 503, RIGHT, PSE 53.09.016. REPAIRED PER EA 91-112350. - [SDR 9708129101](https://openairdocs.org/sdr/9708129101.md): Skin · cracked · Apr 6, 1997 · N91S · Doug DC915 · Fuselage Main, Plate/Skin > DURING L-CHECK, FOUND CORROSION ON SKIN APPROXIMATELY 11 INCHES BEHIND AFT CARGO DOOR. REPAIRED PER EA 91-122317. - [SDR 9706929101](https://openairdocs.org/sdr/9706929101.md): Keel Beam · corroded · Mar 28, 1997 · N91S · Doug DC915 · Fuselage Main, Keel > DURING L-CHECK, FOUND CORROSION ON LEFT KEEL CENTER BEAM JUST AFT OF FORWARD CARGO COMPARTMENT BULKHEAD. REPAIRED PER EA 91-112297. - [SDR 9706499101](https://openairdocs.org/sdr/9706499101.md): Clips · out of adjust · Mar 28, 1997 · N91S · Doug DC915 · Aerodynamic Fairings > DURING L-CHECK, FOUND THAT INADEQUATE FORCE WAS REQUIRED TO REMOVE INTERIOR TAIL CONE RELEASE HANDLE FROM CLIPS. REPLACED CLIP AND ADJUSTED, OPERATIONAL CHECK OK. - [SDR 9703869101](https://openairdocs.org/sdr/9703869101.md): Battery Pack · discharged · Feb 20, 1997 · N91S · Doug DC915 · Emergency Lighting > DURING LINE CHECK, FOUND AFT SECTION OF EMERGENCY CEILING LIGHTS INOPERATIVE. REPLACED BATTERIES IN PACK. OPERATIONAL CHECK OK. - [SDR 9702859101](https://openairdocs.org/sdr/9702859101.md): Battery Pack · discharged · Feb 1, 1997 · N91S · Doug DC915 · Emergency Lighting > DURING LINE CHECK, FOUND EMERGENCY LIGHTS IN AFT STAIRWAY SIDEWALLS INOPERATIVE. REPLACED BATTERY PACK, OPERATIONAL CHECK OK. - [SDR 9700369101](https://openairdocs.org/sdr/9700369101.md): Outflow Valve · malfunctioned · Jan 6, 1997 · N91S · Doug DC915 · Pressure Regulator/Outflow Valve > DURING CLIMBOUT, COULD NOT STOP CABIN FROM CLIMBING ABOVE 8,000 FEET WITH AIRCRAFT ABOVE 17,000 FEET. COULD NOT GET CABIN TO DESCEND WITH POWER BELOW 70 PERCENT AUTO OR MANUAL. FLIGHT DIVERTED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND OUTFLOW LI - [SDR 9622349101](https://openairdocs.org/sdr/9622349101.md): Flap Sw Arm · binding · Oct 18, 1996 · N91S · Doug DC915 · Trailing Edge Flap Control System > AFTER TAKEOFF, THE FLAP HANDLE WAS VERY DIFFICULT TO MOVE TO RETRACT POSITION. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. FOUND FLAP SWITCH ARM BINDING ON SECTOR COTTER PINS. REPLACED PINS AND SHIMMED SWITCH, OPERATIONAL CHECK OK. - [SDR 9615429101](https://openairdocs.org/sdr/9615429101.md): Yoke · corroded · Jul 12, 1996 · N91S · Doug DC915 · Engine Mount Section > DURING LINE CHECK, FOUND CORROSION IN THE NR 1 ENGINE LOWER AFT PYLON YOKE. REPLACED YOKE. - [SDR 9615419101](https://openairdocs.org/sdr/9615419101.md): Mount · corroded · Jul 11, 1996 · N91S · Doug DC915 · Engine Mount Section > DURING LINE CHECK, FOUND CORROSION IN THE NR 1 ENGINE AFT MOUNT. REPLACED MOUNT. - [SDR 9602299101](https://openairdocs.org/sdr/9602299101.md): Wire · loose · Jan 28, 1996 · N91S · Doug DC915 · Light System Wiring > AFT CABIN CEILING EMERGENCY LIGHTS INOPERATIVE. MAINTENANCE FOUND WIRE L794C18 FROM RIGHT LAV FORWARD POWER SUPPLY TERMINAL NR 5 GROUNDED. RECONNECTED WIRE TO AFT EXIT DOOR EMERGENCY LIGHTS. OPERATIONAL CHECK GOOD. - [SDR 9600889101](https://openairdocs.org/sdr/9600889101.md): Battery Pack · discharged · Jan 13, 1996 · N91S · Doug DC915 · Emergency Lighting > DURING LINE MAINTENANCE INSPECTION, FOUND THE LEFT NACELLE EMERGENCY LIGHT INOPERATIVE. REPLACED THE BATTERY PACK AND OPERATIONAL CHECK NORMAL. - [SDR 9600649101](https://openairdocs.org/sdr/9600649101.md): Floorbeam · corroded · Jan 4, 1996 · N91S · Doug DC915 · Fuselage Main, Floor Beam > DURING H-CHECK, FOUND CORROSION ON THE FS 786 FLOORBEAM UPPER SIDE. REPAIRED BEAM (P/N 9912243) PER EA 91-102634. - [SDR 9600639101](https://openairdocs.org/sdr/9600639101.md): Seat Track · corroded · Jan 4, 1996 · N91S · Doug DC915 · Fuselage, Seat/Cargo Attach Fittings > DURING H-CHECK, FOUND CORROSION ON THE RIGHT INBOARD SEAT TRACK FROM FS 200 TO 274. REPAIRED TRACK (P/N 5910143) PER EA 91-102023. - [SDR 9600349101](https://openairdocs.org/sdr/9600349101.md): Fitting · cracked · Jan 3, 1996 · N91S · Doug DC915 · Fuselage Miscellaneous Structure > DURING H-CHECK, FOUND CRACKS IN THE AFT ENTRY DOOR UPPER LEFT AND RIGHT STOP FITTINGS. REPLACED FITTINGS. - [SDR 9521749101](https://openairdocs.org/sdr/9521749101.md): Fitting · corroded · Dec 27, 1995 · N91S · Doug DC915 · Wing, Control Surface Attach Fittings > DURING H-CHECK, FOUND CORROSION IN THE NR 2 FLAP FORWARD HINGE FITTING, LOWER OUTBOARD BOLT HOLE. REPLACED FITTING (P/N 5912479-502). - [SDR 9519759101](https://openairdocs.org/sdr/9519759101.md): Battery Pack · discharged · Dec 5, 1995 · N91S · Doug DC915 · Emergency Lighting > DURING LINE MAINTENANCE INSPECTION, FOUND BOTH EMERGENCY NACELLE LIGHTS INOPERATIVE. REPLACED BOTH BATTERY PACKS. OPERATIONAL CHECK OK. - [SDR 9515349101](https://openairdocs.org/sdr/9515349101.md): Air Distr · smoking · Oct 12, 1995 · N91S · Doug DC915 · Air Distribution System > GROUND BLOWER ON RIGHT PACK FAILED AFTER STARTING BOTH ENGINES. ELECTRICAL SMOKE AND ODOR IMMEDIATELY BEGAN FILLING COCKPIT AND CABIN. SHUTDOWN ENGINES AND PASSENGERS WERE PROMPTLY DEPLANED. CHECKED PACK FAN ROTORS AND WIRING, OPERATED BOTH PACKS WITH APU A - [SDR 9503119101](https://openairdocs.org/sdr/9503119101.md): Longeron · cracked · Feb 24, 1995 · N91S · Doug DC915 · Fuselage Main, Longeron/Stringer > DURING LINE CHECK, FOUND.5 INCH CRACK IN LONGERON 16R THROUGH LOWER LEG AT FS 370. REPAIRED PER EA 91-094932. ## 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 n_number = 'N91S' AND deregistration_id = 'N91S-1999-09-21' ORDER BY difficulty_date DESC ``` This list as a web page: https://openairdocs.org/deregistered/N91S-1999-09-21/reports --- 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.