ASN Wikibase Occurrence # 36681
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| Date: | Monday 15 January 1996 |
| Time: | 08:18 LT |
| Type: |  Mitsubishi MU-2B-36A |
| Owner/operator: | Pro Air Services Of Salt Lake |
| Registration: | N693PA |
| MSN: | 693 |
| Year of manufacture: | 1976 |
| Engine model: | Garrett TPE-331-5-252 |
| Fatalities: | Fatalities: 8 / Occupants: 8 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Malad City, Oneida County, Idaho -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Salt Lake City, UT (KSLC) |
| Pocatello, ID (KPIH) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A Mitsubishi MU-2 departed Salt Lake City, Utah, and climbed to 16,000 feet MS on an IFR flight to Pocatello, Idaho. While in cruise flight, the MU-2 encountered structural icing conditions. According to radar data, the MU-2 began slowing from a cruise speed of about 190 knots with slight deviations from heading and altitude. The airspeed decreased to about 100 knots, and the flight crew declared an unspecified emergency, then radio contact was lost. The MU-2 began a right turn, then it entered a steep descent and crashed. The pilot of a Beech 1900 (about 12 minutes in trail of the MU-2), stated that he encountered moderate rime icing at 16,000 feet. The Beech pilot activated his deice boots (3 times) and descended to 12,000 feet to exit the icing conditions. The MU-2 flight manual warned that during flight in icing conditions, stall warning devices may not be accurate and should not be relied upon; and to minimize ice accumulation, maintain a minimum cruise speed of 180 knots or exit the icing conditions. An investigation determined that the captain of the MU-2 was aware of deficiencies in the timer for the deice boots, as well as other maintenance deficiencies. The captain's medical certificate was dated 11/17/94; he was providing executive transportation for compensation under an agreement for "contractual flights," under 14 CFR 91. Although icing conditions were forecast in the destination area, no icing was forecast for the en route portion of the flight.
Probable Cause: continued flight by the flightcrew into icing conditions with known faulty deice equipment; structural (airframe) ice; and failure of the flight crew to maintain adequate airspeed, which resulted in the loss of aircraft control and collision with terrain. A factor relating to the accident was: the en route weather (icing) condition, which was not forecast (inaccurate forecast).
Accident investigation:
 |
|
Sources:
NTSB SEA96MA043
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=693PA
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 06-Mar-2016 20:57 | Dr.John Smith | Updated [Time, Operator, Location, Departure airport, Destination airport, Source, Narrative] |
| 06-Mar-2016 20:58 | Dr.John Smith | Updated [Location, Narrative] |
| 06-Mar-2016 21:03 | Dr.John Smith | Updated [Location] |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 08:36 | ASN Update Bot | Updated [Time, Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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