NTSB Identification: DEN89LA143.
The docket is stored on NTSB microfiche number 39383.
Accident occurred Tuesday, June 20, 1989 in BOULDER, CO
Probable Cause Approval Date: 06/28/1991
Aircraft: CESSNA 172M, registration: N80893
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 INSTRUCTOR (CFI) AND A PRIVATE RATED DUAL STUDENT WERE PERFORMING A FAMILIARIZATION FLIGHT. THE CFI SAID THE DUAL STUDENT MADE SEVERAL TOUCH AND GO LANDINGS ON RWY 26L, WITH WINDS ESTIMATED BY THE CFI AS BEING FROM 270 DEG AT 15 GUSTING 25 KTS. THE CFI REPORTED THAT DURING THE LAST TOUCHDOWN, THE ACFT WAS ANGLED TO THE LEFT. THE PLANE DEPARTED THE RWY TO THE LEFT AND THE HORIZONTAL STABILIZER STRUCK A RWY LIGHT, RESULTING IN SUBSTANTIAL DAMAGE.

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

INADEQUATE COMPENSATION FOR WIND CONDITIONS BY THE (PRIVATE RATED) DUAL STUDENT AND HIS FAILURE TO MAINTAIN DIRECTIONAL CONTROL, WHICH RESULTED IN AN INADVERTENT GROUND SWERVE, AND INADEQUATE SUPERVISION BY THE INSTRUCTOR PILOT (CFI). A FACTOR RELATED TO THE ACCIDENT WAS: THE UNFAVORABLE WIND CONDITON.

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