Narrative:

I was called out to gate for a dhc-Q400 aircraft returning to gate december 2011 at approximately xa:00 am for stall system fail # 1; # 2; caution illuminated and stall protection module-1 (spm-1) and spm-2 circuit breakers popped. I reset the circuit breakers in accordance with general procedures manual (gpm) and complied with the operational check of stall warning system in accordance with aircraft maintenance manual (amm) task 27-33-00- 710; operations checks good after test. I was notified the following day from a lead technician [there was an issue].the operational check of the stall warning system in accordance with amm task 27-33-00-710 did not reference the lower level minimums (llm) sensitive components associated with this task. The amm task 27-33-00-710 now contains a company [maintenance engineering] supplement with a revision date of december 2011; to comply with a maintenance task card (mtc) # XXX and llm return to service [requirements]. I verified with maintenance control that the aircraft was in compliance and mtc # XXX had been complied with [and noted] in the logbook. Suggest inserting company [engineering] supplements on every amm task associated with llm sensitive components. Should have recognized the relationship of the circuit breakers associated to llm components with stick shaker system.

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Original NASA ASRS Text

Title: A Line Mechanic reports the Stall Warning System Maintenance procedures Operational Checks for their DHC-Q400 aircraft; did not include a CAT-3 Landing Operational Test requirement whenever a Stall Protection Module (SPM) circuit breakers had popped. The SPM circuit breakers were part of their CAT-3 Landing Minimums Manuals.

Narrative: I was called out to gate for a DHC-Q400 aircraft returning to gate December 2011 at approximately XA:00 am for Stall System Fail # 1; # 2; Caution illuminated and Stall Protection Module-1 (SPM-1) and SPM-2 circuit breakers popped. I reset the circuit breakers in accordance with General Procedures Manual (GPM) and complied with the Operational Check of Stall Warning System in accordance with Aircraft Maintenance Manual (AMM) Task 27-33-00- 710; operations checks good after test. I was notified the following day from a Lead Technician [there was an issue].The Operational Check of the Stall Warning System in accordance with AMM Task 27-33-00-710 did not reference the Lower Level Minimums (LLM) sensitive components associated with this task. The AMM Task 27-33-00-710 now contains a company [Maintenance Engineering] Supplement with a revision date of December 2011; to comply with a Maintenance Task Card (MTC) # XXX and LLM return to service [requirements]. I verified with Maintenance Control that the aircraft was in compliance and MTC # XXX had been complied with [and noted] in the logbook. Suggest inserting Company [Engineering] Supplements on every AMM Task associated with LLM sensitive components. Should have recognized the relationship of the circuit breakers associated to LLM components with Stick Shaker System.

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.