ASN Wikibase Occurrence # 359541
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| Date: | Wednesday 23 November 1994 |
| Time: | 14:34 LT |
| Type: |  Fokker F-28 Fellowship 4000 |
| Owner/operator: | USAir |
| Registration: | N479AU |
| MSN: | 11228 |
| Year of manufacture: | 1985 |
| Total airframe hrs: | 18679 hours |
| Engine model: | Rolls-Royce |
| Fatalities: | Fatalities: 0 / Occupants: 53 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Evansville, IN -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Pittsburgh, PA (KPIT) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE FLIGHT CREW REPORTED THAT WHILE DESCENDING FROM CRUISE IN PREPARATION FOR LANDING, THEY NOTICED THAT THE HORIZONTAL STABILIZER WAS NOT RESPONDING TO TRIM INPUTS. THE AUTOPILOT WAS DISENGAGED, AND BOTH NORMAL AND ALTERNATE MODES OF STABILIZER TRIM WAS ATTEMPTED WITHOUT SUCCESS. THE CREW FOLLOWED THE JAMMED STABILIZER APPROACH CHECKLIST, AND WAS ABLE TO EFFECT PITCH CHANGES BY BOTH CREW MEMBERS EXERTING FORCE ON THEIR CONTROL YOKES. POSTINCIDENT INSPECTION OF THE STABILIZER DRIVE ACTUATOR DISCOVERED NO HYDRAULIC LEAKS. THE ACTUATOR'S GEAR BOX WAS DRAINED, AND FOUND TO CONTAIN APPROXIMATELY ONE OUNCE OF MURKY, SLUDGE-LIKE HYDRAULIC FLUID. THE GEAR BOX IS REQUIRED TO BE FILLED WITH SEVEN OUNCES OF HYDRAULIC FLUID. THE ACTUATORS ARE SHIPPED FROM THE MANUFACTURER ESSENTIALLY DEVOID OF HYDRAULIC FLUID, WITH INSTRUCTIONS THAT THEY MUST BE FILLED PRIOR TO SERVICE.
Probable Cause: the failure of company maintenance personnel to adequately service (fill) the horizontal stabilizer drive actuator with hydraulic fluid.
Accident investigation:
 |
|
Sources:
NTSB CHI95IA045
History of this aircraft
Other occurrences involving this aircraft
| 4 March 1995 | N479AU | USAir | 0 | Huntington, WV | |
min |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 12:00 | ASN Update Bot | Added |
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