# Incident 20000202000099I: Doug DC983, Phoenix, AZ, February 2, 2000

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: February 2, 2000, 09:00 local time
- Place: Phoenix, AZ
- Airport: Phoenix Sky Harbor International
- Phase of flight: Climb
- Operating rules: Air carrier (Part 121)
- Operator: AALA
- Location: 33.4343° N, 112.0116° W: Placed by OpenAirDocs at PHOENIX SKY HARBOR INTL (PHX), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.4343&lon=-112.0116&mi=10
- Aircraft: N565AA, a cancelled registration (https://openairdocs.org/deregistered/N565AA-2019-09-13) (OpenAirDocs)
- Registry model: Mcdonnell Douglas DC-9-83(MD-83) (registry code 3022083, https://openairdocs.org/model/mcdonnell-douglas-dc-9-83-md-83) (OpenAirDocs)
- Registry engine: Pratt & Whitney JT8D series (registry code 52053, https://openairdocs.org/engine/pratt-whitney-jt8d-series) (OpenAirDocs)
- Reported make and model: DOUG DC983
- People aboard: 64
- Fatal injuries: 0
- Pilot flight hours: 18,000 total, 10,000 in this make and model, 240 in the last 90 days
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20000202000099I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

(-23) THE FOLLOWING DISCREPANCY WAS ENTERED IN THE AIRCRAFT FLIGHT LOG ON PAGE #5588469:  "AL LVL FLT 13,000 FT. STAB TRIM JAMMED.  OPERATION INTERMITTENT, THEN INOP BOTH SYSTEMS.  CK LIST COMPLETE, IDNG @ FLAPS 28, 122,00 LB. NORMAL 1DNG. USED EXTRA BACK PRESSURE TO MAINTAIN FLT".  AIRCRAFT RETURNED TO PHOENIX SKY HARBOR AIRPORT WITHOUT FURTHER INCIDENT.  AALA MAINTENANCE PERSONNEL REMOVED AND REPLACED THE PRIMARY STABILIZER TRIM MOTOR.  FURTHER TROUBLE SHOOTING REVEALED THAT THE FIRST OFFICER'S STABLIZER TRIM SWITCH IN THE CONTROL COLUMN HAD BROKEN INTERNALLY AND WAS CAUSING AN INTERMITTENT (SHORTING) OPERATION OF THE TRIM MOTOR.  THIS UNCOMMANDED OPERATION WOULD CAUSE THE OVERHEATING OF THE MOTOR AND THE ACUATION (OPENING) OF THE INTERNAL THERMAL SWITCH WHICH WOULD DISCONNECT THE ELECTRICAL FUNCTION OF THE TRIM MOTOR AS THE SYSTEM IS DESIGNED.  THE CONTROL COLUMN SWITCH WAS REMOVED AND REPLACED AND ALL FUNCTIONAL CHECKS WERE NORMAL.  A POST MAINTENANCE FUNCTIONAL TEST FLIGHT WAS SATISFACTORY.

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. For accidents, the NTSB's own investigation is the fuller record.

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