NTSB Identification: DEN88FA097.
The docket is stored on NTSB microfiche number 35853.
Accident occurred Friday, April 15, 1988 in DEER LODGE, MT
Probable Cause Approval Date: 02/28/1989
Aircraft: CESSNA 150, registration: N13788
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE OVERWEIGHT ACFT DEPARTED ON THE SECOND LEG OF A X-COUNTRY FLT. WITNESSES STATED THAT THE ENGINE BEGAN TO RUN ROUGH DURING THE CLIMB AFTER TAKE-OFF. A RETURN TO THE AIRPORT WAS CONDUCTED AND THE ENGINE RETURNED TO NORMAL OPERATION JUST PRIOR TO FLARING FOR LANDING. THE PILOT ELECTED TO ABORT THE LANDING. AFTER INITIATING A CLIMB THE ENGINE AGAIN RAN ROUGH. THE PILOT ATTEMPTED A 180 DEGREE LEFT TURN BACK TO THE ARPT. DURING THE TURN THE ACFT STALLED AND IMPACTED 20 FT SHORT OF THE RUNWAY THRESHOLD. THE INVESTIGATION REVEALED A SEVERLY ERODED LEFT MAGNETO AND THE KEY SWITCH WAS FOUND IN THE LEFT MAGNETO POSITION ONLY.

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

AIRSPEED(VSO)..NOT MAINTAINED..PILOT IN COMMAND

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

STALL/SPIN..INADVERTENT..PILOT IN COMMAND


Contributing Factors

IGNITION SYSTEM,MAGNETO..ERODED


Contributing Factors

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


Contributing Factors

IGNITION SYSTEM,MAGNETO..DISABLED

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