ASN Wikibase Occurrence # 330844
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| Date: | Wednesday 31 March 1971 |
| Time: | 06:33 |
| Type: |  Boeing 720-047B |
| Owner/operator: | Western Air Lines |
| Registration: | N3166 |
| MSN: | 19439/621 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 11521 hours |
| Cycles: | 7011 flights |
| Engine model: | Pratt & Whitney JT3D-3B |
| Fatalities: | Fatalities: 5 / Occupants: 5 |
| Aircraft damage: | Destroyed, written off |
| Category: | Accident |
| Location: | Ontario International Airport, CA (ONT) -
 United States of America
|
| Phase: | Approach |
| Nature: | Training |
| Departure airport: | Los Angeles International Airport, CA (LAX/KLAX) |
| Ontario International Airport, CA (ONT/KONT) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Control was lost during a 3-engine missed ILS approach procedure and the aircraft crashed.
Failure of the aircraft rudder hydraulic actuator support fitting led to the loss of left rudder control. The loss of control situation was worsened by the degraded external visual clues (600 feet overcast; 1200 m visibility in fog haze and smoke).
PROBABLE CAUSE: "The failure of the aircraft rudder hydraulic actuator support fitting. The failure of the fitting resulted in the inapparent loss of left rudder control which, under the conditions of the flight, precluded the pilots ability to maintain directional control during a simulated engine-out missed-approach. The existing weather conditions degraded external visual cues, thereby hampering rapid assessment of aircraft performance by the flight check captain."
Accident investigation:
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Sources:
Location
Revision history:
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