ASN Wikibase Occurrence # 360726
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| Date: | Sunday 13 March 1994 |
| Time: | 00:20 LT |
| Type: | Rockwell 681 Turbo Commander |
| Owner/operator: | American Corp Aviation |
| Registration: | N78CH |
| MSN: | 6038 |
| Total airframe hrs: | 4424 hours |
| Engine model: | GARRETT TPE 331-151K |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Phoenix, AZ -
 United States of America
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | Show Low, AZ (KSOW) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot moved the landing gear selector switch to the down position; however, the landing gear did not extend. The pilot used the emergency gear down system; however, both main landing gear extended only partially and the main wheels failed to rotate to the streamlined position. The main gear collapsed on landing, resulting in damage to the lower fuselage bulkheads and gear attach structure. No hydraulic fluid was found in the system lines, and no leaks detected around the landing gear wells. The nitrogen system pressure was measured at 50 psi; the normal system pressure is 425 to 525 psi. Review of the hydraulic system lines revealed a metal line ruptured with hydraulic fluid saturating the immediate area. The maintenance records indicated the ruptured line was an original equipment item and at least 24 years old. A leak was found in the nitrogen system lines in the wing center section crossover line. Corrosion pitting was observed in several places on both of the lines.
Probable Cause: the failure of the hydraulic and nitrogen system pressure lines, due to an inadequate maintenance inspection program, which failed to detect the corrosion condition of the lines.
Accident investigation:
 |
|
Sources:
NTSB LAX94LA163
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Mar-2024 10:32 | ASN Update Bot | Added |
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