NTSB Identification: DEN05LA139.
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Accident occurred Sunday, May 29, 2005 in Englewood, CO
Probable Cause Approval Date: 02/28/2006
Aircraft: Mooney M20K, registration: N928MB
Injuries: 1 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.

According to the pilot, he was in instrument meteorological conditions and climbing to his cruise altitude when the horizontal situation indicator (HSI) failed. He became disoriented, the airplane got into an unusual attitude, and he lost control of the airplane. When the airplane broke out of the clouds, it was descending rapidly, and he pulled back hard on the control yoke to arrest the descent. During the recovery, the airplane's structural limitations were exceeded and the airplane was overstressed. According to a telephone interview with a mechanic who replaced the HSI at Duncan Aviation, a repair shop located at APA, a plastic gear in the HSI was "stripped" and the heading bug caused the compass card to "hang-up."

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

the pilot's failure to maintain control of the airplane and the pilot's improper use of unusual attitude recovery procedure. Contributing factors were the failure of the HSI and the clouds.

Full narrative available

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