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A B737-400 incurred a delay to replace #1 main brake worn beyond limits. Brake checked at overnight but failed to check brake with pressure.
| Attributes | |
| ACN | 602287 |
| Time | |
| Date | 200312 |
| Day | Sat |
| Local Time Of Day | 0001 To 0600 |
| 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 | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance technician : 12 |
| ASRS Report | 602287 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other Other |
| Factors | |
| Maintenance | performance deficiency : scheduled maintenance performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : inspection performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
#1 brake was at minimum tolerance 1/16 inch on the indicator. I failed to put on hydraulic pumps and set the brakes before checking tolerances. In the morning just before flight, one of the pilots noticed the brake out of tolerance and insisted that it be changed. The flight was 1 1/2 hours late. I hadn't read my check paperwork properly, leading to this problem.
Original NASA ASRS Text
Title: A B737-400 INCURRED A DELAY TO REPLACE #1 MAIN BRAKE WORN BEYOND LIMITS. BRAKE CHKED AT OVERNIGHT BUT FAILED TO CHK BRAKE WITH PRESSURE.
Narrative: #1 BRAKE WAS AT MINIMUM TOLERANCE 1/16 INCH ON THE INDICATOR. I FAILED TO PUT ON HYD PUMPS AND SET THE BRAKES BEFORE CHKING TOLERANCES. IN THE MORNING JUST BEFORE FLT, ONE OF THE PLTS NOTICED THE BRAKE OUT OF TOLERANCE AND INSISTED THAT IT BE CHANGED. THE FLT WAS 1 1/2 HRS LATE. I HADN'T READ MY CHK PAPERWORK PROPERLY, LEADING TO THIS PROB.
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.