BEECH A200 near Salt Lake CIty, UT — 2008-07-21

Probable cause

The failure of the landing gear motor (worn components) resulting in the partial collapse of the landing gear during landing. Contributing to the accident was the flight crew not following emergency checklist procedures to attempt a manual gear extension.

Contributing factors

Contributing to the accident was the flight crew not following emergency checklist procedures to attempt a manual gear extension.

NTSB narrative

The instructor pilot stated that after takeoff and while conducting flight maneuvers, he noticed an unsafe gear indication. The three green lights were extinguished; however, the red "gear transit" light was illuminated. The landing gear visually appeared to be down. The instructor pilot recycled the landing gear, which continued to fail to lock in the extended position. The pilot returned to the airport and executed a low approach over the runway where tower personnel advised them that the landing gear appeared to be down. The crew decided to attempt a landing with the unsafe landing gear indication. After touchdown, the main landing gear partially collapsed, while the nose gear remained extended. A previous incident similar to the accident occurred 14 weeks before. During that event, the flight crew manually extended the gear per the prescribed procedures and made a successful landing. During the accident event, the flight crew did not attempt to manually lower the landing gear as directed in the (checklist). Post accident inspection of the landing gear motor and relay system found that there were worn and chipped sprocket teeth, one of the sprocket shafts was not square with the gear, and at least one of the hanger bearings was worn.

Analysis

Primary failure mode

Mechanical failure

First missed decision gate

Crew did not attempt manual gear extension before landing despite previous malfunction.

NTSB coding

• Electrical system malf/failure · Initial climb
• Checklist Use

Evidence available

• CVR
• FDR / data
• 5 docket documents

Docket documents5

• Cockpit Voice Recorder 12 - Factual Report of Group Chairmancvr
• Flight Data Recorder 10 - Attachment 1 (FDR Tabular Data)fdr
• Flight Data Recorder 10 - Specialist's Factual Reportfdr
• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• Results of FAA Examination to Landing Gearother

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