ASN Wikibase Occurrence # 294025
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| Date: | Saturday 12 March 2005 |
| Time: | 10:20 LT |
| Type: |  Rockwell Aero Commander 500 |
| Owner/operator: | |
| Registration: | N8498C |
| MSN: | 848 |
| Year of manufacture: | 1960 |
| Total airframe hrs: | 4952 hours |
| Engine model: | Lycoming IO-540 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | San Juan, Puerto Rico -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | San Juan-Fernando Luis Ribas Dominicci Airport (SIG/TJIG) |
| Culebra Airport (CPX/TJCP) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Maintenance had been performed to the left main landing gear actuator and flexible hoses that connect to it earlier in the week. The mechanic who performed the work did not complete retraction tests of the landing gear and did not approve the airplane for return to service. The pilot stated that braking action was normal during taxiing, but after takeoff, at approximately 1,000 feet above ground level (AGL), the main gear would not retract and he noticed the hydraulic pressure gauge indicating 0 pressure. He selected gear down, observed three green lights, used the hydraulic emergency hand pump, and turned back to the airport. While operating the hydraulic emergency hand pump, he noticed "some pressure" up to 800 psi. While returning to the airport he moved the emergency hand pump selector valve to "brake only" to be able to stop the airplane but reported he did not get any pressure when using the emergency hydraulic pump. On final approach he slowed the airplane to approximately 85 miles per hour, touched down, and started pumping the hydraulic emergency hand pump for the brakes, with no success. Unable to stop the airplane, it collided with a ditch beyond the departure end of the runway. Following recovery of the airplane, the emergency hand pump selector valve was not found in the "brakes only" position. Operation of the hydraulic emergency hand pump with the selector set to "brakes only" revealed hydraulic pressure was produced. NTSB review of the airplane's Maintenance Manual reveals that the emergency hand pump selector valve, located between the pilot and co-pilot seats, provides a means of directing the flow of hand pumped pressure to either the brake system or the normal hydraulic system. With the selector valve in "brakes only" position, only the wheel brake system and nose steering cylinder received hand pump pressure which will not be indicated on the hydraulic pressure gauge.
Probable Cause: The failure of the pilot to follow the emergency checklist and his inadvertent operation of the airplane with known discrepancies resulting in landing overrun and on-ground collision with a ditch during the landing roll.
Accident investigation:
 |
|
Sources:
NTSB MIA05LA079
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Oct-2022 16:23 | ASN Update Bot | Added |
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