# Incident 19901111057209I: Fokker F28MK4000, Atlanta, GA, November 11, 1990

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: November 11, 1990, 17:50 local time
- Place: Atlanta, GA
- Airport: The William B Hartsfield Atla
- Phase of flight: Descent
- Operating rules: Air carrier (Part 121)
- Operator: USAA
- Location: 33.7490° N, 84.3880° W: Placed by OpenAirDocs: center of Atlanta, GA, within about 7 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=33.7490&lon=-84.3880&mi=10
- Aircraft: N850US, a cancelled registration (https://openairdocs.org/deregistered/N850US-2003-05-28) (OpenAirDocs)
- Registry model: Fokker F.28 MK 0100 (registry code 4990807, https://openairdocs.org/model/fokker-f-28-mk-0100) (OpenAirDocs)
- Reported make and model: FOKKER F28MK4000
- People aboard: 4
- Fatal injuries: 0
- NTSB investigation: [NTSB ATL91IA017](https://openairdocs.org/ntsb/ATL91IA017) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19901111057209I

## Narrative

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

ON DESCENT COMPUTER FAULT LIGHT AND STABILIZER TRIM FAULT LIGHTS CAME ON. AUTOPILOT DISENGAGED.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ATL91IA017](https://openairdocs.org/ntsb/ATL91IA017), Nov 11, 1990: Fokker F28 MK0100 (N850US), Atlanta, GA, incident, no damage. Probable cause: FROZEN MOISTURE IN THE STABILIZER ACTUATOR HYDRAULIC SERVO VALVE WHICH RESULTED IN REDUCED MOVEMENT OF THE SERVO VALVE AND LIMITED ITS ABILITY TO RESPOND TO FLIGHT CONTROL INPUTS. THE LACK OF…

## Other reports on N850US (3)

Matched to the same aircraft by N-number and date.

- [Incident 19970407012699I](https://openairdocs.org/incident/19970407012699I), Apr 7, 1997: Fokker F28MK0100 (N850US), Philadelphia, PA, Minor damage. Narrative: us airways flight 1446 departed bos enroute to phl on 4/7/97. The crew noted in the aircraft's log that "left lg downlock switch" fault indicated on…
- [Incident 19901029062839I](https://openairdocs.org/incident/19901029062839I), Oct 29, 1990: Fokker F28MK0100 (N850US), Erie, PA. During departure from gate the tail touched tail of adjacent DC9. Returned to gate.
- [Incident 19900902047949I](https://openairdocs.org/incident/19900902047949I), Sep 2, 1990: Fokker F28MK0100 (N850US), Syracuse, NY. Precautionary landing when hydraulic system for stabilator failed. Replaced sticking switches and alternate motor.

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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