Casualties unknown

2002-03-16: Mooney M20A (N8390E) — Norman, OK

Norman, OK, US

On March 16, 2002, a Mooney M20A (registration N8390E) was involved in an aviation accident near Norman, OK. Investigators recorded the probable cause as: An improper clamp installed on the mixture cable that would not allow the mixture cable to extend to the full rich position. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 1781061362Data APIEditorial standards

During initial climb, an airplane lost engine power at 800-900 feet AGL. The pilot attempted a 180-degree turn back to the runway, but the right wing struck the ground, and the aircraft slid into two tied-down parked airplanes. Investigation revealed an improperly installed clamp on the mixture cable.

Incident Overview

During the initial climb after takeoff, at an altitude of approximately 800 to 900 feet above ground level, the airplane experienced a complete loss of engine power. Faced with no options for a straight-ahead landing, the pilot executed a right 180-degree turn in an attempt to return to the departure runway.

Sequence of Events

As the airplane banked during the turn, the right wing contacted the ground, followed by the fuselage. The aircraft then slid across the ground in an upright attitude and struck two parked airplanes that were tied down on the ramp. The collision resulted in damage to all three aircraft.

Post-Accident Examination

A subsequent examination of the accident aircraft revealed that an improper clamp had been installed on the mixture control cable. This clamp prevented the mixture cable from moving to the full rich position, which would have restricted the fuel-air mixture during the critical phases of takeoff and climb.

Conclusion

The investigation determined that the cause of the power loss was the incorrect installation of a clamp on the mixture cable, which limited the cable's travel and prevented the engine from receiving a full rich mixture.

Probable cause

An improper clamp installed on the mixture cable that would not allow the mixture cable to extend to the full rich position.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20020319X00363. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.