Two line mechanics report a right-hand aft overwing escape slide inadvertently deployed on a B757-200 aircraft while they were performing an MEL deferral procedure involving a voltage test of the slide squib connectors. The slide safety pin was not installed.

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Attributes
ACN	1029747
Time
Date	201208
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Escape Slide
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Person 2
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

Right-hand (rh) aft overwing slide squib would not test. While following MEL procedure 25-66R; slide deployed. Test box was not available at terminal-ZZZ. Alternate MEL procedure 25-66R didn't specifically state to pin slide bottle.

Original NASA ASRS Text

Title: Two Line Mechanics report a right-hand Aft Overwing Escape Slide inadvertently deployed on a B757-200 aircraft while they were performing an MEL deferral procedure involving a Voltage Test of the Slide Squib connectors. The slide safety pin was not installed.

Narrative: Right-Hand (RH) Aft Overwing Slide Squib would not test. While following MEL Procedure 25-66R; slide deployed. Test box was not available at Terminal-ZZZ. Alternate MEL Procedure 25-66R didn't specifically state to pin slide bottle.

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.