Narrative:

The aircraft was at the gate with a #2 stall warning [system] that would not test. I had another aircraft waiting for maintenance and had received the request while working on a different aircraft. I arrived while boarding was in process and performed a bite test of the #2 stall management yaw damper and found no faults. I contacted maintenance control to defer the #2 stall warning system. There was a bit of confusion between myself and maintenance control on the MEL for #1 or #2 stall warning but we worked through that. I placed the aircraft on MEL; pulled and collared the stick shaker right circuit breaker auto stow circuit breaker but missed the [step to collar the] flight controls auto speed brake circuit breaker. The pressure; time constraints and distractions caught up to me on this one. Perhaps a list of circuit breakers to be pulled; in a list style with all the circuit breakers in one place instead of different paragraphs.

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Original NASA ASRS Text

Title: A Maintenance Technician missed a step in the MEL deactivation procedure and neglected to open and collar the Auto Speed Brake Circuit Breaker. He sighted time pressure and distractions as contributing factors.

Narrative: The aircraft was at the gate with a #2 Stall Warning [System] that would not test. I had another aircraft waiting for maintenance and had received the request while working on a different aircraft. I arrived while boarding was in process and performed a BITE Test of the #2 Stall Management Yaw Damper and found no faults. I contacted Maintenance Control to defer the #2 Stall Warning System. There was a bit of confusion between myself and Maintenance Control on the MEL for #1 or #2 Stall Warning but we worked through that. I placed the aircraft on MEL; pulled and collared the Stick Shaker Right Circuit Breaker Auto Stow Circuit Breaker but missed the [step to collar the] Flight Controls Auto Speed Brake Circuit Breaker. The pressure; time constraints and distractions caught up to me on this one. Perhaps a list of circuit breakers to be pulled; in a list style with all the circuit breakers in one place instead of different paragraphs.

Data retrieved from NASA's ASRS site 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.