Narrative:

At approximately mid-morning; february 2013; I performed a safety check on a hyster boom lift; which included a walk around for general condition; and fluid checks. I then got on to the vehicle; started it and moved all controls to make sure they worked. I moved the hyster lift from the north end of the hangar ramp to position the hyster lift at the thrust reverser (T/right) cowl in front of the hangar. Satisfied that the lift was in good working condition I signed-off the daily user check. After lunch I lowered the hoist by hand and attached the T/right sling. With the aid of other team members we moved sling in position over T/right cowl; I drove while team members guided. Once sling was attached to T/right cowl we started the process of moving it from the pallet to a chair cart [flatbed]; again I was driving while team members guided and steadied the cowl. Without warning the cowl fell to the ground with a loud thud; and I saw an object fly across the hangar floor approximately 15 to 20 ft. I put the lift in park; set the parking brake and turned lift 'off'. I then retrieved the object which turned out to be the clevis attach bolt; which connects the hoist to the boom which is a threaded bolt.

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Original NASA ASRS Text

Title: Three Aircraft Maintenance Technicians (AMTs) report about a B757 Thrust Reverser (T/R) half that separated and fell from a sling and chain pulley assembly attached to a boom on a forklift. AMTs were attempting to move T/R from shipping crate to a flatbed chair cart.

Narrative: At approximately mid-morning; February 2013; I performed a Safety Check on a Hyster Boom Lift; which included a walk around for general condition; and fluid checks. I then got on to the vehicle; started it and moved all controls to make sure they worked. I moved the Hyster Lift from the north end of the hangar ramp to position the Hyster Lift at the Thrust Reverser (T/R) cowl in front of the hangar. Satisfied that the lift was in good working condition I signed-off the Daily User Check. After lunch I lowered the hoist by hand and attached the T/R sling. With the aid of other team members we moved sling in position over T/R cowl; I drove while team members guided. Once sling was attached to T/R cowl we started the process of moving it from the pallet to a chair cart [flatbed]; again I was driving while team members guided and steadied the cowl. Without warning the cowl fell to the ground with a loud thud; and I saw an object fly across the Hangar floor approximately 15 to 20 FT. I put the lift in park; set the parking brake and turned lift 'Off'. I then retrieved the object which turned out to be the clevis attach bolt; which connects the hoist to the boom which is a threaded bolt.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.