ASN Wikibase Occurrence # 355883
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| Date: | Tuesday 13 May 1997 |
| Time: | 06:05 LT |
| Type: |  Saab 340B |
| Owner/operator: | Wings West Airlines |
| Registration: | N313AE |
| MSN: | 340B-313 |
| Total airframe hrs: | 9594 hours |
| Engine model: | GE CT7-9B |
| Fatalities: | Fatalities: 0 / Occupants: 21 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | San Luis Obispo, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | (KSBP) |
| Los Angeles, CA (KLAX) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight crew reported that all pretakeoff checks were normal and that prior to setting takeoff power the Constant Thrust on Takeoff (CTOT) computer was set to 100-percent engine torque for takeoff. The ensuing takeoff was normal through liftoff and gear retraction; however, during initial climb the left engine experienced compressor stalling and lost power. As the crewmembers were executing the engine failure checklist, the right engine first increased power in Automatic Power Reserve (APR) and then began to similarly stall and lose power. After about 20 seconds the engines recovered sufficient power to enable the flight crew to remain airborne and return for landing on the departure runway. Review of the digital flight data recorder (DFDR) output and internal examination of each engine revealed that the engines had compressor stalled due to accumulated dirt and contaminants on the compressors. A review of the right engine DFDR data revealed that, while the left engine was stalling, the flight crew had retarded the right engine power lever past the 64-degree power lever angle position which tripped off the CTOT system. The resulting transient in fuel flow, in company with an atmospheric temperature inversion, reduced the stall margin of the right engine.
Probable Cause: Compressor stalls of both engines due to in-service compressor contamination. Factors in the compressor stall of the right engine were an atmospheric temperature inversion and a transient fuel flow condition produced when the constant thrust on takeoff (CTOT) system was disabled by the pilot's inadvertent movement of the right engine power lever during execution of the emergency procedure.
Accident investigation:
 |
|
Sources:
NTSB LAX97IA180
History of this aircraft
Other occurrences involving this aircraft
| 11 August 1997 | N313AE | Wings West Airlines | 0 | Lafayette, LA | |
min |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2024 16:44 | ASN Update Bot | Added |
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