NTSB Identification: SEA06IA105.
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Incident occurred Wednesday, May 17, 2006 in Portland, OR
Probable Cause Approval Date: 03/26/2007
Aircraft: Boeing 757-222, registration: N506UA
Injuries: 189 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

Post landing examination of the airplane by personnel from United Airlines and the Federal Aviation Administration revealed that the left off-wing escape slide had deployed, without inflating, and was observed hanging from the aircraft's fuselage. Further examination by United maintenance personnel revealed that the slide carrier tray assembly had rotated out to the open position. The off-wing slide compartment, door and operating latch mechanism were inspected by United maintenance personnel and no discrepancies were noted. Additional examination of the off-wing escape slide assembly by personnel from Boeing engineering revealed no evidence of mechanical malfunction with the system. Maintenance records indicated that on May 15, 2006, (four flights before the slide deployment) the off-wing escape slide pack was replaced in accordance with routine scheduled maintenance intervals for the assembly. The maintenance was completed, and inspected, by United Airlines personnel at a maintenance facility in Chicago, Illinois. A post incident Maintenance Investigation report submitted to the NTSB by United Airlines indicated that the inadvertent deployment of the off-wing slide assembly was the result of the carrier tray not being locked in the stowed position.

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

The inadvertent deployment of the off-wing escape slide due to the inadequate latching of the slide compartment door following access by maintenance personnel.

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