NTSB Identification: DEN92LA027.
The docket is stored on NTSB microfiche number 45968.
Accident occurred Monday, January 27, 1992 in ENGLEWOOD, CO
Probable Cause Approval Date: 09/02/1994
Aircraft: CESSNA 172P, registration: N52872
Injuries: 2 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 CFI WAS DEMONSTRATING A SOFT FIELD TAKEOFF. AFTER LIFT-OFF THE AIRPLANE SETTLED BACK TO THE RUNWAY, THEN BECAME AIRBORNE AGAIN. CONTROL WAS LOST, AND THE AIRPLANE SETTLED INTO TERRAIN ADJACENT TO THE RUNWAY. NO DISCREPANCIES WERE FOUND DURING THE WRECKAGE EXAMINATION. THE LEFT FLAP WAS FOUND DEPLOYED TO ABOUT 10 DEG DUE TO IMPACT DAMAGE, AND THE FOLLOW-UP CABLE WAS SLACK. THE REMAINDER OF THE FLAP SYSTEM WAS INTACT. THIS IS CONSISTENT WITH FLAPS BEING IN THE UP POSITION AT IMPACT. FLAPS ARE ELECTRICALLY DRIVEN THROUGH A JACK SCREW TO THE RIGHT FLAP. THE LEFT FLAP IS DRIVEN BY A FOLLOW-UP CABLE THROUGH THE RIGHT FLAP JACK SCREW; THEREFORE THE LEFT FLAP CANNOT BE DRIVEN TO A POSITION TO WHICH THE RIGHT FLAP IS NOT DRIVEN. THE RIGHT FLAP WAS FOUND IN THE UP POSITION. THE RECOMMENDED FLAP SETTING FOR A SHORT FIELD TAKEOFF IS 10 DEG. ACCORDING TO THE FAA FLIGHT TRAINING HANDBOOK, DURING SOFT FIELD TAKEOFF THE AIRPLANE CAN BECOME AIRBORNE AT AN AIRSPEED BELOW SAFE CLIMB SPEED DUE TO THE ACTION OF GROUND EFFECT.

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

A LOSS OF CONTROL DUE TO THE PILOT'S FAILURE TO FOLLOW PROPER SOFT FIELD TAKEOFF PROCEDURES BY FLYING OUT OF GROUND EFFECT AT AN INADEQUATE AIRSPEED. A FACTOR WAS THE PILOT'S IMPROPER USE OF FLAPS.

Index for Jan1992 | Index of months