ASN Wikibase Occurrence # 134731
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| Date: | Monday 7 November 1983 |
| Time: | 17:00 |
| Type: |  Westland 30-100 |
| Owner/operator: | Airspur Helicopters Inc. |
| Registration: | N5830T |
| MSN: | 5 |
| Total airframe hrs: | 558 hours |
| Engine model: | Rolls-Royce GEM MK 510 |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Long Beach, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | LAX |
| SNA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
AT 4,000 FT MSL DIRECTIONAL CONTROL WAS LOST. WITNESSES OBSERVED THE HELICOPTER DESCENDING THROUGH THE LOCALIZED CLOUD LAYER IN A LEFT HIGH-ROTATION TURN, WITH THE PITCH ATTITUDE VARYING & ITS RATE OF DESCENT 'VERY FAST.' THE HELICOPTER THEN COLLIDED WITH HIGH TENSION WIRES. THE T/R SERVO WAS FOUND ATTACHED TO THE VERT STABILIZER MOUNT WITH THE UPPER PORTION OF THE N-DEG-2 LEVER ATTACHED TO IT. THE PITCH CHANGE LEVER FROM THE SERVO TO THE 90-DEG GEARBOX HAD FRACTURED DO TO HIGH CYCLE FATIGUE. THE T/R BLADES CONTAINED COUNTERWEIGHTS WHICH ARE DESIGNED, TOGETHER WITH AERODYNAMIC AIRLOADS, TO ASSIST IN RETURNING THE BLADES TO A NEAR 'NEUTRAL' PITCH IN THE EVENT OF A T/R DRIVE AND/OR PITCH CONTROL LEVER FAILURE.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
ROTORCRAFT FLIGHT CONTROL,T/R BELLCRANK/QUADRANT..FATIGUE
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
ROTORCRAFT FLIGHT CONTROL SYSTEM,TAIL ROTOR SERVO..FATIGUE
Sources:
NTSB id LAX84AA054
WAAS
http://aviationintel.com/fast-history-westland-30/
https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgad.nsf/0/F0FE401BE16357FB86256A4D0074ADA6?OpenDocument
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Oct-2011 11:02 | harro | Updated [Aircraft type, Narrative, Plane category, ] |
| 21-Dec-2016 19:26 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 04-Jun-2022 13:04 | Aerossurance | Updated [Nature, Source, Narrative] |
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