ASN Wikibase Occurrence # 357338
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| Date: | Sunday 26 May 1996 |
| Time: | 21:20 LT |
| Type: |  British Aerospace BAe-146-200A |
| Owner/operator: | Air Wisconsin |
| Registration: | N608AW |
| MSN: | E2049 |
| Total airframe hrs: | 18978 hours |
| Engine model: | Lycoming ALF-502R-5 |
| Fatalities: | Fatalities: 0 / Occupants: 58 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Des Moines, IA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Denver, CO (KDIA) |
| Moline, IL (KMLI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While operating in clouds at flight level 290, in an area with thunderstorms and turbulence, the airplane experienced a loss of power in all four engines. Information from the flight data recorder indicated that during descent from flight level 290, an elevator oscillation occurred. The #1 and #2 engines were shut down due to high turbine gas temperatures. The #2 engine was restarted before making an emergency landing at the Des Moines Airport. The captain reported that the airplane had been flown into severe icing conditions. The aircraft flight manual (AFM) prohibited flight in icing conditions above 26,000 feet (except when necessary for descent). Also, the AFM stipulated the minimum engine speeds which needed to be maintained while operating in icing conditions; it also required that the thrust management system (TMS) be disconnected in icing conditions. There were indications that the TMS was disconnected about 230 seconds after engine roll-back began. Additionally, the AFM did not provide accurate information concerning 'in cloud' correction factor for the outside temperature thermometer.
Probable Cause: failure of the flight crew to follow proper procedures, which resulted in an accumulation of ice and subsequent loss of engine power. Factors relating to the incident were: thunderstorms, turbulence, icing conditions, and the inaccurate method that was provided by the manufacturer for determining 'in cloud' air temperature and icing conditions.
Accident investigation:
 |
|
Sources:
NTSB CHI96IA173
History of this aircraft
Other occurrences involving this aircraft
| 18 January 1991 | N608AW | Air Wisconsin | 0 | Chicago, IL | |
min |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 16:48 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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