INTERNATIONAL BUSINESS MACHINES, INC., GRUMMAN G-1159, N720Q, KLINE, SOUTH CAROLINA, JUNE 24, 1974
At 1645 e.d.t., June 24, 1974, a Grumman model G-1159, N720Q, crashed near Kline, South Carolina. The aircraft, which was owned and operated by International Business Machines, Inc., was on a training flight in visual meteorological conditions. The aircraft made several 360 deg rolls and then dove into a swampy area. The three crewmembers were killed and the aircraft was destroyed. The National Transportation Safety Board determines that the probable cause of the accident was 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 circuit in the spoiler extend circuitry. Whereas the spoilers probably deployed symmetrically, the left ground spoiler actuator failed in flight and caused a loss of lateral control. The subsequent loss of pitch control was caused by the full nosedown elevator trim tab position and the high aircraft speed.
- Aircraft Accident Report.
National Transportation Safety BoardOffice of Aviation Safety
Washington, DC USA 20594
- Publication Date: 1975-5-14
- Pagination: 30 p.
- TRT Terms: Aircraft crashes; Crash investigation; Crash landing; Drag; Electric circuits; Failure; Navigation; Spoilers; Steering components
- Uncontrolled Terms: Control surfaces
- Old TRIS Terms: Circuits; Visual navigation
- Subject Areas: Aviation; Safety and Human Factors;
- Accession Number: 00092094
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NTSB-AAR-75-8
- Files: NTIS
- Created Date: Oct 18 1976 12:00AM