BOMBARDIER INC CL-600-2B19 near Phoenix, AZ — 2010-10-18

Probable cause

The overextension of the main cabin door due to difficulty opening the door because the power-assist motor cable was lodged within the main cabin door assembly.

NTSB narrative

The flight crew reported that, at the completion of the flight, the airplane taxied to the arrival gate, and ground personnel attempted to open the airplane's main passenger cabin door. The airplane had been dispatched with the main cabin door's power-assist motor inoperative, which was deferred via company maintenance procedures and the minimum equipment list. Ground personnel were unable to open the door and received assistance from the captain. Initially, the captain was unable to open the door, which was jammed in the closed position. After several attempts, the captain exerted a large force with his shoulder and was able to get the door to open. When the main cabin door was finally opened, it traveled beyond its normal extension limits and hit the pavement. The power-assist motor cable was found lodged within the door assembly.

Analysis

Primary failure mode

Mechanical failure

First missed decision gate

Dispatching the flight with known MCD power assist motor inoperative.

NTSB coding

• Sys/Comp malf/fail (non-power) · Standing

Evidence available

• 4 docket documents

Docket documents4

• Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1form
• Witness Statementinterview
• Witness Statementinterview
• Record of Emailother

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