NTSB Identification: BFO90FA003.
The docket is stored on NTSB microfiche number 40942.
Accident occurred Sunday, October 29, 1989 in MCHENRY, MD
Probable Cause Approval Date: 06/22/1992
Aircraft: CESSNA 177, registration: N30036
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.

WITNESSES REPORTED THE ACFT TOOK OFF WITH WINDS THAT VARIED FROM A LEFT CROSSWIND TO A LEFT QUARTERING TAILWIND. THE RWY SLOPES UPWARD, AND THE TERRAIN SLOPES DOWN PAST THE RWY END. ACCORDING TO WITNESSES, ALTHOUGH THE ACFT CLIMBED SLOWLY, AND THE ACFT ROLLED LEFT AND RIGHT SEVERAL TIMES, THE ENGINE WAS OPERATING THE ENTIRE TIME. THE ACFT ABRUPTLY PITCHED DOWN, DESCENDED AND CRASHED. EXAMINATION OF THE ACFT REVEALED THE FLAPS WERE EXTENDED 30 DEGREES (FULL DOWN). ACCORDING TO AIRCRAFT PERFORMANCE DATA THE BEST RATE OF CLIMB WITH 30 DEGREES OF FLAPS IS ABOUT 310 FPM, BASED ON STANDARD TEMPERATURE CONDITIONS. THE DENSITY ALTITUDE WAS COMPUTED TO BE ABOUT 4000 FT.

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

THE PILOT'S FAILURE TO OBTAIN ADEQUATE TAKEOFF AIRSPEED AS A RESULT OF AN IMPROPER FLAP SETTING. CONTRIBUTING FACTORS WERE A TAKEOFF WITH A TAILWIND, AN UPSLOPING RUNWAY, AND HIGH DENSITY ALTITUDE.

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