NTSB Identification: DEN99IA033.
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Nonscheduled 14 CFR
Incident occurred Monday, January 18, 1999 in CLOVIS, NM
Probable Cause Approval Date: 08/13/2001
Aircraft: Beech E90, registration: N16NM
Injuries: 3 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
The air ambulance flight was transporting a male infant in an incubator to Clovis, New Mexico. During the descent into Clovis, the control yoke moved to the full forward position. The pilot eased back on the yoke and the nose pitched up. The pilot was able to maintain control by the use of power and elevator trim, and elected to return to Albuquerque, where an uneventful landing was made. Postincident examination disclosed a drooping wire bundle beneath the pilot's seat, at F.S. 122. The insulation around the H16A10 wire (copilot's windshield heat) had chafed against the elevator down cable (part number 50-524439-31), causing a short circuit. Although the pilot did not detect the odor of smoke, the elevator cable was burnt through and had separated. No circuit breakers were opened nor were any fuses blown.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: Total failure of the elevator control cable due to a short circuit from chafing against an adjoining electrical cable, and failure of maintenance personnel to detect the problem during an AAIP phase inspection. Full narrative available
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