ASN Wikibase Occurrence # 202137
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| Date: | Thursday 15 April 1999 |
| Time: | 15:30 LT |
| Type: |  Piper PA-31-310 Navajo |
| Owner/operator: | Air Desert Pacific Corp |
| Registration: | N57AS |
| MSN: | 31-113 |
| Year of manufacture: | 1967 |
| Total airframe hrs: | 7259 hours |
| Engine model: | Lycoming TSIO-540-A2B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | LA VERNE, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | (KPOC) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The aircraft had been in maintenance for an adjustment to the right engine manifold pressure differential controller. The procedure required the uncowling of the engine. A certificated airframe and powerplant mechanic removed the cowling and made the required adjustments, then left for the day. A noncertificated mechanic replaced the cowling and the pilot then proceeded to perform the postmaintenance test flight. During climbout, the right engine upper cowling separated and wrapped around the right horizontal stabilizer. The pilot experienced difficulty in controlling the aircraft until the airspeed was reduced, then he returned to the airport and landed. Inspection of the cowling disclosed that the inboard latches on the upper cowling were not damaged. In his written statement, the pilot notes that his failure to detect the unlatched inboard cowling fasteners resulted from 'poor preflight inspection habits and a failure to follow the checklist.'
Probable Cause: The in-flight separation of the right engine cowling due to the operator's inadequate maintenance quality control procedures and the pilot's inadequate preflight inspection.
Accident investigation:
 |
|
Sources:
NTSB LAX99LA181
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Nov-2017 12:40 | ASN Update Bot | Added |
| 08-Apr-2024 07:04 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Source, Narrative, Category, Accident report] |
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