ASN Wikibase Occurrence # 299023
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| Date: | Monday 8 May 2000 |
| Time: | 08:25 LT |
| Type: |  McDonnell Douglas MD 500N |
| Owner/operator: | Los Angeles Co Sheriff's Department |
| Registration: | N955SD |
| MSN: | LN080 |
| Year of manufacture: | 1995 |
| Total airframe hrs: | 2802 hours |
| Engine model: | Allison 250-C20 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Los Angeles, CA -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Long Beach, CA (KLGB) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor reported the purpose of the flight was to practice emergency procedures as part of routine intradepartmental training. The training was being conducted in an open field on property owned by the Sheriff's Department. The flight instructor stated that they often utilized the field for flight training purposes, and reported that he had done some training there about 1-week prior. He reported that they performed a high reconnaissance of the field prior to landing and he noted nothing unsuitable about the terrain. A ground survey was not performed prior to the conduct of training flights and landings in the field. The flight instructor stated that he reduced the throttle to ground idle about 10 to 12 feet agl to simulate a total power loss. The pilot trainee was on the controls; he landed the helicopter with no problems. The flight instructor stated that the helicopter slid forward only a few feet, then stopped abruptly. The skids had become entangled in some 18-inch-tall grass and imbedded vines, causing unexpected friction. He stated that the natural tendency to input aft cyclic to stop the aircraft from going over caused the main rotor blades to contact the tail boom.
Probable Cause: The combined failure of the operator management and the check pilot to ensure the landing area was suitable for the slide on landing. Factors were the high vegetation that entangled the skids, resulting in the abrupt stop and nose down movement of the helicopter, and the training pilot's inappropriate response to the nose pitch down.
Accident investigation:
 |
|
Sources:
NTSB LAX00TA186
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Oct-2022 01:35 | ASN Update Bot | Added |
| 30-May-2023 01:26 | Ron Averes | Updated |
Corrections or additions? ... Edit this accident description
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