A line mechanic reports an electric type scissor lift equipment moved up (vertically); uncommanded; ...

Narrative:

While performing maintenance on a B767-300 aircraft; I was involved in an incident that caused damage to the trailing edge of the right-hand (rh) outboard (otbd) flap 25' inches long by 4' inches wide and 46' inches from the inboard edge. While I was maneuvering an electric lift into position to replace a torn placard on the #9 spoiler; the lift moved up while it was in the drive mode; and the upper rail [on the lift] hit the flap.after the incident; manager mr. X and crew chief mr. Y were testing the electric lift to see how such a thing could happen when the lift again moved up uncommanded in the drive mode. This would happen sporadically. This was witnessed by other crew chiefs and mechanics. The electric lift was tagged unserviceable and taken out of service immediately. Automotive came to test the lift and it again would move up uncommanded sporadically.

Original NASA ASRS Text

Title: A Line Mechanic reports an electric type scissor lift equipment moved up (vertically); uncommanded; while in the drive mode. The uncommanded upward movement caused lower surface damage to the B767-300 right-hand Outboard Trailing Edge Flap.

Narrative: While performing maintenance on a B767-300 aircraft; I was involved in an incident that caused damage to the trailing edge of the Right-Hand (RH) Outboard (OTBD) Flap 25' inches long by 4' inches wide and 46' inches from the inboard edge. While I was maneuvering an electric lift into position to replace a torn placard on the #9 spoiler; the lift moved up while it was in the Drive Mode; and the upper rail [on the lift] hit the flap.After the incident; Manager Mr. X and Crew Chief Mr. Y were testing the electric lift to see how such a thing could happen when the lift again moved up uncommanded in the Drive Mode. This would happen sporadically. This was witnessed by other Crew Chiefs and Mechanics. The electric lift was tagged unserviceable and taken out of service immediately. Automotive came to test the lift and it again would move up uncommanded sporadically.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	953891
Time
Date	201106
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Speedbrake/Spoiler
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Experience	Maintenance Technician 20
Events
Anomaly	Ground Event / Encounter Vehicle

A line mechanic reports an electric type scissor lift equipment moved up (vertically); uncommanded; while in the drive mode. The uncommanded upward movement caused lower surface damage to the B767-300 right-hand outboard trailing edge flap.