ASN Wikibase Occurrence # 354250
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Saturday 27 June 1998 |
| Time: | 06:05 LT |
| Type: |  Cessna 172 |
| Owner/operator: | Private |
| Registration: | N7188A |
| MSN: | 29288 |
| Total airframe hrs: | 6911 hours |
| Engine model: | Continental O-300-A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Flagstaff, AZ -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Private |
| Departure airport: | (KFLG) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated that the preflight and run-up were conducted with no anomalies noted. After takeoff, the airplane experienced a loss of engine power followed by a loss of altitude and collision with terrain. The airplane came to rest inverted in a sewage pond near the airport. After the power loss, the pilot made an unsuccessful attempt to restart the engine utilizing the emergency checklist. The engine was inspected and mechanical continuity of the engine was established. The crankcase was separated and it was noted that the bearings, pistons, and cylinders exhibited heat discoloration. The number 4 main bearing exhibited evidence of rubbing on the crankshaft and a section of that bearing insert was severely worn, heat distressed, and had flowed over the edge of the crankcase bearing journal. The number 6 connecting rod bearing insert exhibited an unidentified metal substance in the oil port. The remaining crankcase oil journals were found to be clear. The oil pump was disassembled and revealed a nick on one of the driven gear teeth, which corresponded to circumferential scoring on the oil pump housing. The oil filter and suction screen were clean. No further discrepancies were noted with the engine. Review of the maintenance records revealed that an annual inspection, which included an oil change, had been completed approximately 1 hour prior to the accident flight.
Probable Cause: Oil system contamination with an unidentified metal substance that traveled through the oil system and blocked the number 4 main bearing and number 6 connecting rod bearing oil ports, resulting in oil starvation and failure of the engine. The source of the contamination is undetermined.
Accident investigation:
 |
|
Sources:
NTSB LAX98LA214
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 06:11 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation