Narrative:
An electrical short circuit caused an unwanted extension of the ground and flight spoilers during a training flight. Control was lost; the aircraft made several 360 degree rolls and then dove into a swampy area.
PROBABLE CAUSE: "An unwanted extension of the ground and flight spoilers, which resulted in a loss of control at an altitude from which recovery could not be made. The ground spoilers probably deployed because of a hot electrical short in the spoiler extend circuitry. Whereas the spoilers probably deployed symetrically, the left ground spoiler actuator failed in flight and caused a loss of lateral control. The subsequent logs of pitch control was caused by the full nosedown elevator trim tab position and the high aircraft speed."
Loss of control
| Status: | Accident investigation report completed and information captured |
| Date: | Monday 24 June 1974 |
| Time: | 16:45 |
| Type: |  Grumman G-1159 Gulfstream II |
| Operator: | IBM |
| Registration: | N720Q |
| MSN: | 58 |
| First flight: | 1969 |
| Total airframe hrs: | 3224 |
| Engines: | 2 Rolls-Royce Spey 511-8 |
| Crew: | Fatalities: 3 / Occupants: 3 |
| Passengers: | Fatalities: 0 / Occupants: 0 |
| Total: | Fatalities: 3 / Occupants: 3 |
| Aircraft damage: | Destroyed |
| Aircraft fate: | Written off (damaged beyond repair) |
| Location: | near Kline, SC ( United States of America)
|
| Crash site elevation: | 83 m (272 feet) amsl |
| Phase: | En route (ENR) |
| Nature: | Training |
| Departure airport: | Savannah International Airport, GA (SAV/KSAV), United States of America |
| Savannah International Airport, GA (SAV/KSAV), United States of America |
An electrical short circuit caused an unwanted extension of the ground and flight spoilers during a training flight. Control was lost; the aircraft made several 360 degree rolls and then dove into a swampy area.
Probable Cause:
PROBABLE CAUSE: "An unwanted extension of the ground and flight spoilers, which resulted in a loss of control at an altitude from which recovery could not be made. The ground spoilers probably deployed because of a hot electrical short in the spoiler extend circuitry. Whereas the spoilers probably deployed symetrically, the left ground spoiler actuator failed in flight and caused a loss of lateral control. The subsequent logs of pitch control was caused by the full nosedown elevator trim tab position and the high aircraft speed."
Accident investigation:
 |
|
Classification:
Electrical system problem Loss of control
Sources:
» NTSBFollow-up / safety actions
NTSB issued 1 Safety Recommendation
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This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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