Pilot Debrief

AERO COMMANDER 690 near Cedar City, UT — 2009-10-21

Final reportWPR10LA034
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Date
2009-10-21
Location
Cedar City, UT, USA
Airport
CDC
Aircraft
AERO COMMANDER 690
Registration
N690TR
Category
Airplane
Highest injury
None
Fatalities
0
Phase of flight
Approach

Probable cause

The failure of the landing gear accumulator/regulator and the installation of the improper priority valve, which precluded the landing gear from extending and locking into place.

NTSB narrative

Upon arrival over the destination airport during a positioning flight, the pilot attempted to extend the airplane's landing gear. Only the nose gear and the left main landing gear locked in the down position. The pilot reported that he performed the emergency gear extension procedure specified in the airplane's flight manual, but the right main gear did not lock down. The pilot returned to the departure airport and landed. During rollout, the right main landing gear collapsed and the airplane slid off the runway resulting in substantial airframe damage. An examination of the airplane revealed that an accumulator/regulator in the extension system had malfunctioned. In addition, an incorrect priority valve was installed and precluded the gear from locking down.

Analysis

Primary failure mode
Mechanical failure
First missed decision gate
Pilot could have aborted landing when right gear failed to extend properly.

NTSB coding

Evidence available

  • 2 docket documents
View NTSB final reportView NTSB docket

Docket documents2

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