ASN Wikibase Occurrence # 358040
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| Date: | Friday 10 November 1995 |
| Time: | 18:45 LT |
| Type: | Hufges 369D |
| Owner/operator: | Sacramento Sheriff's Dept |
| Registration: | N33CN |
| MSN: | 670150D |
| Total airframe hrs: | 17075 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mather, CA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | (KMHR) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The left seat pilot was practicing night autorotations to runway 22 to maintain his currency. After the left seat pilot completed six hovering autorotations to the ground and eight autorotations to a power recovery, the right seat pilot snapped the right collective throttle to the ground idle position at 250 feet in a climb, to simulate a loss of engine power and announced 'power failure.' The left seat pilot initiated an autorotation; neither pilot was aware of an actual loss of power. When the left seat pilot applied throttle to initiate a power recovery, the engine's compressor stalled and the 'engine out' and 'auto re-ignite' lights illuminated. The left seat pilot continued with the autorotation, landed on runway 22 with the tail-first, broke the skids, and the aircraft rolled over. The investigation revealed that the right seat pilot did not perform the throttle rigging check before departing on the accident flight as recommended by the 369D pilot handbook. Several postaccident ground runs of the engine were conducted. Based upon those, it was determined that rapid roll off of the right seat throttle could retard the throttle below ground idle and flameout the engine. The throttle misrigging had not been detected by maintenance personnel.
Probable Cause: Fuel starvation due to the right seat safety pilot's inadvertent engine shutdown when he closed the throttle to simulate an engine failure, and his failure to perform the throttle rigging check before takeoff. Contributing to the accident was the improper rigging of the throttle system coupled with the pilot's improper recovery from the autorotation.
Accident investigation:
 |
|
Sources:
NTSB LAX96TA044
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 09:19 | ASN Update Bot | Added |
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