ASN Wikibase Occurrence # 175876
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| Date: | Saturday 27 March 2004 |
| Time: | 12:16 |
| Type: |  Mitsubishi MU-2B-26A |
| Owner/operator: | Private |
| Registration: | N81MF |
| MSN: | 375SA |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 3107 hours |
| Engine model: | Airesearch TPE331-5 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | La Verne, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Lake Havasu, AZ (KHII) |
| La Verne, CA (KPOC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The twin turboprop airplane landed hard collapsing the nose gear, and causing substantial damage to the airframe. The pilot said that about 6-7 miles from the airport, in the terminal descent, he noticed the right engine torque meter read zero. This had occurred before, and the torque would come back if he manipulated the throttle. He continued the normal approach for landing. In the landing flare the airplane yawed right despite his corrective left rudder pedal input. The airplane landed hard, bouncing on the nose twice, breaking the nose wheel strut. It then slid about 2,000 feet down the runway. The ferry pilot, who flew the airplane to the repair facility after the accident, said that the engine power levers were consistently split throughout the entire ferry flight. In order to have the engine power perimeters matched, the right power lever had to be about 2 inches forward of the left one and this positional relationship was constant from flight idle to full power. Maintenance records had no record of compliance to Mitsubishi Service Bulletin No. 097/73-001, which was published "to assure the engine and propeller rigging is adjusted within manufactures specifications and to prevent potential degraded flight handling qualities associated with the flight idle power being set asymmetrically or too low."
Probable Cause: the pilot's failure to adequately compensate for an asymmetrical thrust condition and to maintain directional control during the landing flare. The owner/pilot's failure to comply with the applicable service bulletin concerning propeller/power control rigging was a factor.
Accident investigation:
 |
|
Sources:
NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20040415X00472&key=1
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-May-2015 17:45 | Noro | Added |
| 08-Dec-2016 17:27 | wf | Updated [Operator] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 07-Dec-2017 17:49 | ASN Update Bot | Updated [Cn, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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