ASN Wikibase Occurrence # 364182
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| Date: | Saturday 7 December 1991 |
| Time: | 16:51 LT |
| Type: |  Airbus A310-324 |
| Owner/operator: | Delta Air Lines |
| Registration: | N819PA |
| MSN: | 456 |
| Year of manufacture: | 1988 |
| Engine model: | P&W PW4152 |
| Fatalities: | Fatalities: 0 / Occupants: 122 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Covington, KY -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | |
| New York, NY (KJFK) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
WHILE CLIMBING THROUGH 6000 FEET THERE WAS AN UNCOMMANDED REDUCTION OF POWER ON THE RIGHT ENGINE, ACCOMPANIED BY A WARNING OF THE THRUST REVERSER BECOMING UNLOCKED. THE ENGINE WAS SHUTDOWN AND THE AIRPLANE RETURNED FOR LANDING. A READOUT OF THE DFDR DISCLOSED THE THRUST REVERSER WAS NEVER UNLOCKED. THE INVESTIGATION DISCLOSED THAT THE RESTRICTOR PLACED IN THE BLEED AIR LINE USED TO HEAT THE REVERSER COMPONENTS WAS TOO LARGE AND THESE COMPONENTS HAD BEEN EXPOSED TO EXCESSIVE HEAT. ELECTRICAL WINDINGS HAD FAILED AND A FALSE SIGNAL OF AN INFLIGHT THRUST REVERSER UNLOCK CAUSED THE POWER TO BE REDUCED ON THE ENGINE. THE ENGINE WAS ORIGINALLY MANUFACTURED BY PRATT & WHITNEY AS A PW4460 AND THEN REBUILT AS A PW4152, AT WHICH TIME THE REVERSER COMPONENTS MANUFACTURED BY ROHR WERE ADDED. THE JOB WAS DESCRIBED AS A 'RUSH JOB,' AND ROHR SENT TWO MECHANICS TO ASSIST PRATT & WHITNEY IN THE REBUILD.
Probable Cause: THE INSTALLATION OF AN IMPROPER RESTRICTOR IN THE BLEED AIR LINE BY THE MANUFACTURER, WHICH CAUSED THE RVDT TO FAIL DUE TO HEAT, AND BROUGHT ABOUT THE UNCOMMANDED POWER LOSS.
Accident investigation:
 |
|
Sources:
NTSB NYC92IA042
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Mar-2024 12:24 | ASN Update Bot | Added |
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