NTSB Identification: DCA88MA011.
The docket is stored on NTSB microfiche number 38154.
Scheduled 14 CFR
Accident occurred Wednesday, December 23, 1987 in KENAI, AK
Probable Cause Approval Date: 08/02/1989
Aircraft: PIPER PA-31-350, registration: N496SC
Injuries: 6 Fatal,2 Serious,2 Minor.

NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft accident report.

THE PILOT HAD JUST DEPARTED THE RUNWAY WHEN HE REPORTED TO THE FLIGHT SERVICE STATION THAT HE HAD ENGINE PROBLEMS. THE AIRCRAFT WAS OBSERVED BY WITNESSES TO BE ABOUT 300 FT ON A DESCENDING DOWNWIND. THE PILOT STATED THAT HE WAS CIRCLING FOR RUNWAY ONE. SURVIVING PASSENGERS DESCRIBED THE ENGINES AS RUNNING ROUGH AND UNEVEN. THE INVESTIGATION REVEALED THAT THE AIRCRAFT'S WEIGHT WAS MORE THAN THE PILOT HAD CALCULATED AND THE C.G. WAS 3.4 INCHES FURTHER AFT THAN WAS CALCULATED. HOWEVER, THE WEIGHT AND C.G. WERE WITHIN LIMITS.EXAMINATION OF THE ENGINE DISCLOSED THAT THE RIGHT ENGINE HAD AN EXTENSIVE CYLINDER HEAD CRACK, A PARTIALLY DISCONNECTED INTAKE PIPE, AND WAS CAPABLE OF PRODUCING 55% OF RATED POWER. THE LEFT ENGINE HAD SEVEN SEVERLY WORN CAM LOBES. THE RUDDER TRIM WAS DEFLECTED FULL LEFT AT IMPACT. THE EVIDENCEINDICATED THAT THE PILOT HAD RETARDED THE THROTTLE FOR THE LEFT ENGINE AND WAS USING ONLY THE RIGHT ENGINE TO SUSTAIN FLIGHT. EXAM OF COMPANY CHECKLIST USAGE REVEALED SEVERAL DIFFERENT IMPROPER VERSIONS.

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

ENGINE ASSEMBLY,CYLINDER..FAILURE,TOTAL

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

ENGINE ASSEMBLY,CYLINDER..FATIGUE

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

EMERGENCY PROCEDURE..IMPROPER..PILOT IN COMMAND

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

THROTTLE/POWER CONTROL..IMPROPER USE OF..PILOT IN COMMAND


Contributing Factors

TRIM SETTING..IMPROPER..PILOT IN COMMAND


Contributing Factors

1 ENGINE..FAILURE,PARTIAL



Contributing Factors

ENGINE ASSEMBLY,CAMSHAFT..WORN




Contributing Factors

MAINTENANCE,100-HOUR INSPECTION..INADEQUATE..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

INDUCTION AIR CONTROL,INTAKE MANIFOLD..SEPARATION

Index for Dec1987 | Index of months