NTSB Identification: FTW88LA140.
The docket is stored on NTSB microfiche number 38174.
Nonscheduled 14 CFR
Accident occurred Friday, July 22, 1988 in OKLAHOMA CITY, OK
Probable Cause Approval Date: 11/24/1989
Aircraft: PIPER PA-28R, registration: N2970M
Injuries: 2 Serious.

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 AIR TAXI AIRPLANE, HAULING CARGO, WAS ATTEMPTING A TAKEOFF AND RAN OFF THE END OF THE RUNWAY AND ENDED UP IN A DITCH. THE PILOT SAID THE ENGINE HAD FAILED. A CHECK ON THE WRECKAGE REVEALED THE ENGINE HAD THE WRONG TYPE OF SPARK PLUGS, ONE MAGNETO WAS ADVANCED 7 DEGREES TOO FAR, AND THE BRAKES WERE MAKING METAL TO METAL CONTACT. AFTER PLUGS WERE CHANGED AND THE MAGNETO RESET, THE ENGINE WAS OPERATED FROM IDLE TO FULL THROTTLE AND OPERATED SATISFACTORILY. THE AIRPLANE WAS ALSO OVERWEIGHT. THE BRAKES WERE FOUND WITH LININGS WORN TO THE RIVETS.

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

AIRCRAFT PREFLIGHT..INADEQUATE..PILOT IN COMMAND


Contributing Factors

IGNITION SYSTEM,MAGNETO..IMPROPER


Contributing Factors

IGNITION SYSTEM,SPARK PLUG..IMPROPER


Contributing Factors

MAINTENANCE..INADEQUATE..COMPANY MAINTENANCE PERSONNEL


Contributing Factors

LANDING GEAR,NORMAL BRAKE SYSTEM..WORN


Contributing Factors

AIRCRAFT WEIGHT AND BALANCE..DISREGARDED..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..DITCH

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