Narrative:

Possible misinterpretation of MEL. On preflight; found the following message: (alternate) altn anti skid and norm anti skid. Entered the discrepancies in the logbook; referred to the MEL and called maintenance. The mechanic deferred my entry with the following sign-off entry: 'placarded anti-skid system inoperative per MEL.' that was followed by the MEL required downgrade of the aircraft autoland status. Please refer to the B757 MEL. The reason for this report; is my possible misunderstanding of which MEL should have been used. The mechanic used (MEL) 32-4a. After reviewing further; I now believe MEL 32-5b (option 2); should have been used in lieu of; or in addition to 32-4a. I have shared the scenario with 4 mechanics and 4 pilots; all with different opinions of what should be correct. We were in compliance with 32-5b; but the logbook entry may have been labeled (MEL) 32-4a; instead of 32-5b. Recommend that the anti skid MEL's (norm and altn) be reviewed and rewritten so that the intent of 32-5b is clear. When 32-5b refers you to 32-4a 'complete system;' does 'complete system' include the alternate system? If so; delete the 5th bullet which reads: 'alternate anti-skid valves (MEL item 32-5a) are operative.'how can one MEL 32-5b; refer you to another (32-4a); which requires the operation of the very item you're applying the MEL to (vis a vis the altn system). Recommend logbook audit.

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Original NASA ASRS Text

Title: During preflight check a B757-200 Captain noticed status messages 'ALTN ANTI-SKID' and 'NORM ANTI-SKID.' Anti-skid system deferred inop; per MEL 32-4a. Captain believes MEL 32-5b (Option 2) should have been used. Reporter questions if 'complete system' requires that 'alternate anti-skid valves are operative.'

Narrative: Possible misinterpretation of MEL. On Preflight; found the following message: (alternate) ALTN ANTI SKID and NORM ANTI SKID. Entered the discrepancies in the logbook; referred to the MEL and called Maintenance. The Mechanic deferred my entry with the following sign-off entry: 'Placarded Anti-Skid system inoperative per MEL.' That was followed by the MEL required downgrade of the aircraft Autoland status. Please refer to the B757 MEL. The reason for this report; is my possible misunderstanding of which MEL should have been used. The Mechanic used (MEL) 32-4a. After reviewing further; I now believe MEL 32-5b (Option 2); should have been used in lieu of; or in addition to 32-4a. I have shared the scenario with 4 mechanics and 4 pilots; all with different opinions of what should be correct. We were in compliance with 32-5b; but the logbook entry may have been labeled (MEL) 32-4a; instead of 32-5b. Recommend that the ANTI SKID MEL's (Norm and Altn) be reviewed and rewritten so that the intent of 32-5b is clear. When 32-5b refers you to 32-4a 'Complete System;' does 'Complete System' include the Alternate system? If so; delete the 5th bullet which reads: 'Alternate anti-skid valves (MEL item 32-5a) are operative.'How can one MEL 32-5b; refer you to another (32-4a); which requires the operation of the very item you're applying the MEL to (vis a vis the ALTN system). Recommend logbook audit.

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.