# N991Z: Douglas DC-9-31, registration cancelled 2001-08-28

- Type: Cancelled registration (FAA registry, deregistered aircraft)
- Cancelled: August 28, 2001
- Status when cancelled: Triennial form not returned
- Airframe: [Douglas DC-9-31](https://openairdocs.org/model/douglas-dc-9-31) (registry code 3022065)
- Data sheets: [TCDS A6WE](https://openairdocs.org/tcds/A6WE) (OpenAirDocs)
- Serial number: 47096
- Type of aircraft: Fixed wing multi engine
- Certificate issued: February 27, 1998
- Last registry action: July 9, 2001
- Mode S code: ADD899
- Owner when cancelled: [Wells Fargo Bank Northwest Na Trustee](https://openairdocs.org/faa-owner/WELLS%20FARGO%20BANK%20NORTHWEST%20NA%20TRUSTEE)
- Location: [Salt Lake City, UT](https://openairdocs.org/faa-place/UT/Salt%20Lake%20City)
- Owner type: Corporation
- Owner's area on the map: 40.7558° N, 111.8843° W: Placed by OpenAirDocs at the center of ZIP code 84111, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft was based
- The mark today: https://openairdocs.org/aircraft/N991Z
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=991Z
- Page: https://openairdocs.org/deregistered/N991Z-2001-08-28

From the FAA registry file of October 29, 2026, cancelled registrations. Owners' street addresses are left out. The Mode S code belongs to the N-number, not the airframe.

ADs and bulletins for the Douglas DC-9-31: https://openairdocs.org/model/douglas-dc-9-31.md

## Service difficulty reports (30)

Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

- [SDR TWAA9912305](https://openairdocs.org/sdr/TWAA9912305), Sep 10, 1999: LIGHT. INOP. DURING LANDING NOTICED A SECTION OF COACH EGRESS LIGHTS INOP. REPLACED LIGHT STRIP AND BATTERY PACK. CC 7-23-99 STL.
- [SDR TWAA9805907](https://openairdocs.org/sdr/TWAA9805907), Feb 14, 1998: SPAR. CRACKED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND RT WING AFT FLAP INBD HINGE CASTING, LOWER INBD HOLE ON REAR SPAR, HAD A CRACK INDICATION ON FACE. INSTALLED REPAIR 
- [SDR TWAA9801401](https://openairdocs.org/sdr/TWAA9801401), Jan 24, 1998: VALVE. WORN. STL - FLT 107 - AFTER NORMAL TAKEOFF AND PRESSURIZATION NORMAL, AT APPROX 5000 MSL NOTICED OUTFLOW VALVE CLOSED AND PACK PRESSURE NORMAL BUT AIRCRAFT NOT PRESSU
- [SDR TWAA9800801](https://openairdocs.org/sdr/TWAA9800801), Jan 16, 1998: REGULATOR. FAILED. STL - FLT 283 - DURING CLIMB, CABIN ALTITUDE CONTINUED TO CLIMB. REPLACED RT PACK REGULATOR MFG P/N 392454-3-1. (M)
- [SDR TWAA9710202](https://openairdocs.org/sdr/TWAA9710202), Aug 26, 1997: POWER SUPPLY. INOPERATIVE. STL - FLT 608 - DURING CRUISE, THE EMERGENCY LIGHTS ILLUMINATED. REMOVED AND REPLACED THE POWER SUPPLY. OPERATIONAL CHECK NORMAL. MFG P/N 5822-2, MANUFACTURED B
- [SDR TWAA9799002](https://openairdocs.org/sdr/TWAA9799002), Aug 23, 1997: BATTERY PACK. DISCHARGED. STL - FLT 565 - DURING CRUISE, THE EMERGENCY LIGHTS ILLUMINATED. REMOVED AND REPLACED THE BATTERY PACK, MFG P/N 5822-2 MANUFACTURED BY LUMINESCENT SYSTEMS INC. 
- [SDR TWAA9798002](https://openairdocs.org/sdr/TWAA9798002), Aug 22, 1997: BATTERY PACK. DISCHARGED. STL - FLT 237 - DURING CRUISE, THE EMERGENCY ESCAPE PATH LIGHTING ILLUMINATED INTERMITTENTLY. REMOVED AND REPLACED THE BATTERY PACK, MFG P/N 5822-2, MANUFACTURE
- [SDR TWAA9797001](https://openairdocs.org/sdr/TWAA9797001), Aug 18, 1997: BATTERY PACK. DISCHARGED. STL - FLT 502 - DURING CRUISE, THE EMERGENCY LIGHTS ILLUMINATED. REMOVED AND REPLACED THE BATTERY PACK MFG PN 5822-2, MANUFACTURED BY LUMINESCENT SYSTEMS INC. O
- [SDR TWAA9783001](https://openairdocs.org/sdr/TWAA9783001), Jul 23, 1997: POWER SUPPLY. MALFUNCTIONED. STL - FLT 291 - DURING CRUISE, EGRESS LIGHTS ILLUMINATED. REMOVED AND REPLACED POWER SUPPLY, MFG P/N 100865, MANUFACTURED BY BRUCE INDUSTRIES. OPS CHECK NORMAL.
- [SDR TWAA9782001](https://openairdocs.org/sdr/TWAA9782001), Jul 22, 1997: POWER PACK. INOPERATIVE. STL - FLT 663 - DURING ROUTINE MAINTENANCE, EMERGENCY LIGHTS ILLUMINATED. REMOVED AND REPLACED POWER PACK, MFG P/N 5822-2, MANUFACTURED BY LUMINESCENT SYSTEMS, 
- [SDR TWAA9781005](https://openairdocs.org/sdr/TWAA9781005), Jul 22, 1997: POWER PACK. ILLUMINATED. STL - FLT 410 - DURING CRUISE, EMERGENCY LIGHTS ILLUMINATED. REMOVED AND REPLACED POWER PACK, MFG PN 5822-2, MANUFACTURED BY LUMINESCENT SYSTEMS, INC. OPS CHECK
- [SDR TWAA9750001](https://openairdocs.org/sdr/TWAA9750001), Apr 16, 1997: SWITCH. FAILED. STL - FLT 302 - DURING CLIMB, LEFT GEAR DOOR WARNING LIGHT STAYED ON. CYCLED GEAR, NO HELP. REMOVED AND REPLACED LEFT GEAR DOOR WARNING SWITCH, MFG P/N H14-6, M
- [SDR TWAA9710002](https://openairdocs.org/sdr/TWAA9710002), Feb 17, 1997: BATTERY PACK. DISCHARGED. STL - FLT 295 - DURING CRUISE, THE ESCAPE PATH LIGHTING ILLUMINATED. REMOVED AND REPLACED THE BATTERY PACK, MFG 5822-2, MANUFACTURED BY LUMINESCENT SYSTEMS INC.
- [SDR TWAA9809508](https://openairdocs.org/sdr/TWAA9809508), Feb 14, 1997: SKIN. DENTED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND NR 1 L/E SLAT WITH DENTS IN THE L/E. REPAIRED DENTS PER SRM 57-03, PAGE 18A PAR 12B, ITEM A, REFERENCE SRM 51-70-2 P
- [SDR TWAA9809507](https://openairdocs.org/sdr/TWAA9809507), Feb 14, 1997: FRAME. CRACKED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND FUSELAGE FRAME AT STA 1110 WITH APPROXIMATELY .25 INCH CRACK AT L13R AND L14R. REPAIRED PER SRM 53-03, FIG 4 PAGE 5.
- [SDR TWAA9809506](https://openairdocs.org/sdr/TWAA9809506), Feb 14, 1997: SKIN. BULGED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND AT FS 180 BETWEEN L21L TO L22L, AREA HAD A RAISED PLACE IN THE SKIN. REPAIRED PER SRM 51-50-00, AND INSTALLED DOUBLE
- [SDR TWAA9809415](https://openairdocs.org/sdr/TWAA9809415), Feb 14, 1997: LONGERON. CHAFED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND A HOLE WORN THROUGH THE UPPER FLANGE OF LONGERON 8L, STA 1066. REPAIRED PER SRM 53-02, FIG 5. (X)
- [SDR TWAA9809414](https://openairdocs.org/sdr/TWAA9809414), Feb 14, 1997: FLOORBEAM. CORRODED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND CORROSION ON LOWER SIDE OF THE FLOORBEAM AT STA 200, LBL 43 INCHES TO RBL 43 INCHES. REMOVED CORROSION PER SRM 51-10
- [SDR TWAA9805506](https://openairdocs.org/sdr/TWAA9805506), Feb 14, 1997: HINGE. CRACKED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND AFT FLAP INBOARD HINGE CASTING LOWER INBOARD HOLE ON REAR SPAR CRACKED ON FACE APPROX .75 INCH. INSTALLED REPAIR DOU
- [SDR TWAA9805801](https://openairdocs.org/sdr/TWAA9805801), Feb 7, 1997: SKIN. CRACKED. MCI - DURING OP 15 MAINTENANCE CHECK, FOUND TE OF RT TE FLAP WITH SMALL CRACK APPROX .25 NCH AND PIECE OF METAL MISSING APPROX 8 INCH FROM INBOARD END. INSTALLE
- [SDR 96ZZZM1481](https://openairdocs.org/sdr/96ZZZM1481), Oct 12, 1996: FUEL CONTROL. MALFUNCTIONED. PIT - DURING CLIMB, NR 1 ENGINE, S/N 2106, WOULD NOT RESPOND TO THRUST LEVER MOVEMENT. SHUT DOWN ENGINE. REPLACED ENGINE DRIVEN FUEL PUMP, MFG P/N 378201-7 AND 
- [SDR 96ZZZM1480](https://openairdocs.org/sdr/96ZZZM1480), Oct 12, 1996: FUEL PUMP. MALFUNCTIONED. PIT - DURING CLIMB, NR 1 ENGINE, S/N 2106, WOULD NOT RESPOND TO THRUST LEVER MOVEMENT. SHUT DOWN ENGINE. REPLACED ENGINE DRIVEN FUEL PUMP, MFG P/N 378201-7 AND 
- [SDR 96ZZZM1447](https://openairdocs.org/sdr/96ZZZM1447), Oct 8, 1996: POWER SUPPLY. INOPERATIVE. STL - DURING DESCENT, EGRESS LIGHT IN FIRST CLASS ILLUMINATED. FOUND FAULTY BATTERY POWER SUPPLY, MFG P/N 5822-2. REPLACED BATTERY POWER SUPPLY AND EGRESS LIGHT
- [SDR 96ZZZX1204](https://openairdocs.org/sdr/96ZZZX1204), Feb 17, 1996: CONNECTOR. DIRTY. STL - DURING ROUTINE MAINTENANCE, FOUND EGRESS LIGHTS SEAT ROWS 21 TO 23 AND TAILCONE PATHWAY, INOPERATIVE. FOUND EGRESS LIGHT CABLE CONNECTOR, MFG PN 5854-1, D
- [SDR 96ZZZX1239](https://openairdocs.org/sdr/96ZZZX1239), Jan 24, 1996: LONGERON. CRACKED. STL - DURING CHECK 'C', FOUND .50 INCH CRACK IN LONGERON 4L, LOWER LEG, STA 737. REPAIRED PER SRM 53-02, FIGURE 2A. AIRCRAFT TT: 63,390 HOURS; 75,098 CYCLES.
- [SDR 96ZZZX1238](https://openairdocs.org/sdr/96ZZZX1238), Jan 24, 1996: BELT RING. CRACKED. STL - DURING CHECK 'C', FOUND .50 INCH CRACK AT BOTH ATTACH POINTS TO BELT RING, LONGERON 6R, STA 718. REPAIRED PER SRM 53-02, FIGURE 2A. AIRCRAFT TT: 68,390 HR
- [SDR 96ZZZX1237](https://openairdocs.org/sdr/96ZZZX1237), Jan 24, 1996: LONGERON. CRACKED. STL - DURING CHECK 'C', FOUND .50 INCH CRACK IN LOWER FLANGE OF LONGERON 7L, STA 699. REPAIRED PER SRM 53-02, FIGURE 2A. AIRCRAFT TT: 63,390 HOURS; 75,098 CYCLE
- [SDR 96ZZZM219](https://openairdocs.org/sdr/96ZZZM219), Jan 24, 1996: LONGERON. CRACKED. STL - DURING C-CHECK, FOUND .5 INCH CRACK IN LOWER FLANGE OF LONGERON 7L, STATION 699. REPAIRED PER SRM 53-02, FIGURE 2A.
- [SDR 96ZZZM217](https://openairdocs.org/sdr/96ZZZM217), Jan 24, 1996: LONGERON. CRACKED. STL - DURING C-CHECK, FOUND ONE 2 INCH CRACK IN LONGERON 4L, LOWER LEG, STATION 737. REPAIRED PER SRM 53-02, FIGURE 2A.
- [SDR 96ZZZM216](https://openairdocs.org/sdr/96ZZZM216), Jan 24, 1996: BELT RING. CRACKED. STL - DURING C-CHECK, FOUND .5 INCH CRACK AT BOTH ATTACH POINTS TO BELTRING, LONGERON 6R, STATION 718. REPAIRED PER SRM 53-02, FIGURE 2A.

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 19810311018819I](https://openairdocs.org/incident/19810311018819I), Mar 11, 1981: Doug DC931 (N991Z), St Louis, MO. Flight returned after takeoff due to aircraft being hard to control. Stabilizer actuator computer replaced.

## Other aircraft with N991Z

- [Registered now](https://openairdocs.org/aircraft/N991Z): Icon A5, S/N 00205, built 2023

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