NTSB Identification: ATL96LA073.
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Nonscheduled 14 CFR
Accident occurred Monday, April 01, 1996 in RALEIGH, NC
Probable Cause Approval Date: 08/29/1997
Aircraft: Canadair CL-600S, registration: N999TF
Injuries: 9 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
During an instrument landing system (ILS) approach the airline transport pilot noticed a discrepancy in the landing gear indicators. He raised the landing gear and lowered it again. The main landing gear indicator lights were illuminated, indicating that the main gear was extended and locked, but the nose gear light was extinguished. The light in the gear handle was off, indicating that the system was functioning properly. The pilot did not use the emergency landing gear extension system. The aircraft was landed, and the nose gear collapsed. Subsequent examination revealed an intermittently operating extend solenoid in the nose gear selector valve.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: the flight crew's inadequate emergency procedure in that they did not manually extend the landing gear, as specified in the airplane flight manual. A factor relating to the accident was: the intermittent operation of the extend solenoid in the nose gear selector valve. Full narrative available
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