NTSB Identification: ATL88LA115.
The docket is stored on NTSB microfiche number 36516.
Accident occurred Tuesday, March 15, 1988 in BUTLER, AL
Probable Cause Approval Date: 07/10/1989
Aircraft: CESSNA 172K, registration: N78840
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT RPTD THAT HE OBSERVED THE ENGINE OIL PRESSURE INDICATION DROP TO ZERO DURING A LOW-LEVEL PIPELINE PATROL FLIGHT. HE ATTEMPTED TO INCREASE ENGINE PWR AND INITIATE A CLIMB, BUT THE ENGINE BEGAN TO RUN ROUGH. HE SUBSEQUENTLY LANDED ON THE PIPELINE RIGHT-OF-WAY, WHERE THE AIRPLANE COLLIDED WITH ROUGH TERRAIN AND NOSED OVER. POST-CRASH EXAM OF THE ENGINE REVEALED NO EVIDENCE OF ANY PREEXISTING MECHANICAL MALFUNCTION OR FAILURE. SUBSEQUENT ENGINE TEST-RUNS REVEALED NORMAL OIL PRESSURE INDICATIONS, ON BOTH THE COCKPIT GAUGE AND AN EXTERNAL, DIRECT-READING GAUGE.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

UNSUITABLE TERRAIN OR TAKEOFF/LANDING/TAXI AREA..SELECTED..PILOT IN COMMAND


Contributing Factors

FLUID,OIL..PRESSURE TOO LOW




Contributing Factors

ENGINE ASSEMBLY..VIBRATION


Contributing Factors

PRECAUTIONARY LANDING..ATTEMPTED..PILOT IN COMMAND

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