Narrative:

Company air carrier's escape slide safety checklist may not provide adequate protections on boeing 747-400 aircraft to prevent a slide deployment while a main entry door (med) task is in progress. During a review of the aircraft maintenance manual (amm) 12-21-11; I noticed that the 'warning' in amm 12-21-11; section 2; H; (1) informs the mechanic to install a safety pin into the door emergency power reservoir (EPR) bottle. After the pin is installed; this amm is for girt bar servicing; maintenance can be done. However; the second part of the task asks the mechanic to place the door mode selector lever into the 'armed' position (amm 12-21-11; 2; H; (5); (d)) for cleaning and lubrication of the girt bar locks. There is a different 'warning' informing the mechanic to: 'turn the handle slowly to the necessary limit; if you turn the handle and open the door the escape system will operate; this can cause injury or damage.' if the escape system operates; the slide raft may deploy since the [slide] girt bar locks are in the floor fittings at this point of the task. Amm 25-69-03; 3 has the same two warnings; section has the same warnings and even a section on what to do if the slide raft pack opens (amm 25-69-03; 2). No resolution at this time.

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Original NASA ASRS Text

Title: An Aircraft Maintenance Technician (AMT) reports that a company Escape Slide Safety Checklist may not provide adequate protections for mechanics on their B747-400 aircraft when performing the cleaning and lubrication of the door slide Girt Bar and floor fittings.

Narrative: Company Air Carrier's Escape Slide Safety Checklist may not provide adequate protections on Boeing 747-400 aircraft to prevent a slide deployment while a Main Entry Door (MED) Task is in progress. During a review of the Aircraft Maintenance Manual (AMM) 12-21-11; I noticed that the 'Warning' in AMM 12-21-11; Section 2; H; (1) informs the Mechanic to install a Safety pin into the door Emergency Power Reservoir (EPR) bottle. After the pin is installed; this AMM is for Girt Bar Servicing; Maintenance can be done. However; the second part of the Task asks the Mechanic to place the door Mode Selector Lever into the 'Armed' position (AMM 12-21-11; 2; H; (5); (d)) for cleaning and lubrication of the girt bar locks. There is a different 'Warning' informing the Mechanic to: 'turn the handle slowly to the necessary limit; if you turn the handle and open the door the Escape System will operate; this can cause injury or damage.' If the Escape System operates; the slide raft may deploy since the [slide] girt bar locks are in the floor fittings at this point of the task. AMM 25-69-03; 3 has the same two warnings; section has the same warnings and even a section on what to do if the slide raft pack opens (AMM 25-69-03; 2). No resolution at this time.

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.