ASN Wikibase Occurrence # 354902
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| Date: | Tuesday 30 December 1997 |
| Time: | 15:00 LT |
| Type: |  Cessna 172RG |
| Owner/operator: | Back Bay Construction, Inc. |
| Registration: | N5404V |
| MSN: | 172RG0522 |
| Total airframe hrs: | 4619 hours |
| Engine model: | Lycoming O-360-F1A6 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Van Nuys, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | (KVNY) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor stated that the student pilot had extended the landing gear on the downwind leg of the traffic pattern, but then retracted it after being told to go around by the control tower. On the second downwind leg, the student again placed the gear switch in the down position; however, neither the student nor the instructor visually verified that the gear was down and locked. During the final flare for landing, the instructor noted that the gear was not down and that the 5 amp gear warning circuit breaker had opened. He then closed the circuit breaker and noted the gear starting to extend, but it had achieved only an intermediate position at the time of touchdown. The airplane subsequently settled on to the runway and incurred damage to the underside, the right wing, and the right horizontal stabilizer. A review of the Cessna 172RG Service Manual, Drawing No. 2471000, 'Wiring Diagram-Landing Gear System' indicated that subject circuit breaker, in addition to providing power to the gear indicator lights and warning horn, also powers the main gear downlock switches and the stall warning horn.
Probable Cause: The student and flight instructor's failure to verify that the landing gear was in the down position, and the design of the electrical system in which a single-point aircraft system malfunction (one open circuit breaker) disabled both the landing gear warning system and the main gear downlock switches.
Accident investigation:
 |
|
Sources:
NTSB LAX98LA065
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 20:22 | ASN Update Bot | Added |
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