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A technician working a B737-800 a-chk had confusing information on method of brake wear pin measurement. Manual states check 1 pin only.
| Attributes | |
| ACN | 628880 |
| Time | |
| Date | 200408 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 628880 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : brake wear pin other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : work cards performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : inspection performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Chart Or Publication Environmental Factor Aircraft Maintenance Human Performance |
| Primary Problem | Chart Or Publication |
| Situations | |
| Publication | Maintenance Manual |
Narrative:
I was assigned aircraft X to accomplish an a-chk. I measured the brakes as per the maintenance manual. I measured the forward pin on all the brakes. The #1 brake was measured at 5/32 inch. I was told by a fellow mechanic that the aircraft had an audit accomplished on it and the auditor had day shift change the brake because the aft pin was 4/32 inch. They were told by the auditor that you are required to check all of the pins. This is contrary to the maintenance manual, aircraft maintenance/local controller response and the 'TR' (see attached) which states measure 1 pin.
Original NASA ASRS Text
Title: A TECHNICIAN WORKING A B737-800 A-CHK HAD CONFUSING INFO ON METHOD OF BRAKE WEAR PIN MEASUREMENT. MANUAL STATES CHK 1 PIN ONLY.
Narrative: I WAS ASSIGNED ACFT X TO ACCOMPLISH AN A-CHK. I MEASURED THE BRAKES AS PER THE MAINT MANUAL. I MEASURED THE FORWARD PIN ON ALL THE BRAKES. THE #1 BRAKE WAS MEASURED AT 5/32 INCH. I WAS TOLD BY A FELLOW MECH THAT THE ACFT HAD AN AUDIT ACCOMPLISHED ON IT AND THE AUDITOR HAD DAY SHIFT CHANGE THE BRAKE BECAUSE THE AFT PIN WAS 4/32 INCH. THEY WERE TOLD BY THE AUDITOR THAT YOU ARE REQUIRED TO CHK ALL OF THE PINS. THIS IS CONTRARY TO THE MAINT MANUAL, ACFT MAINT/LCL CTLR RESPONSE AND THE 'TR' (SEE ATTACHED) WHICH STATES MEASURE 1 PIN.
Data retrieved from NASA's ASRS site as of July 2007 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.