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A B757-200 brake was checked on arrival when hot and signed off within limits. An FAA safety inspector checked brake when cold, found out of limits.
| Attributes | |
| ACN | 602607 |
| Time | |
| Date | 200312 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Weather Elements | Rain |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance lead technician : 15 maintenance technician : 22 |
| ASRS Report | 602607 |
| Person 2 | |
| Affiliation | government : faa |
| Function | other personnel other |
| Events | |
| Anomaly | maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : person 2 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : lighting contributing factor : schedule pressure contributing factor : weather performance deficiency : repair performance deficiency : inspection performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Weather Aircraft Chart Or Publication FAA Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Problem arose upon ramp check of aircraft X overnight check. WX at 3 16 hour days in a row, dark and misty rain. FAA ramp checked aircraft. A40 brake R2R. Long hours, low light, checked brake when hot. Aircraft was moved from gate to hangar which could cause a repositioning of the brake discs resulting in conflicting measurements of brake wear pin. Also, brake was hot when checked which causes metal to expand and cold when checked by FAA 9 hours later which causes metal to contract.
Original NASA ASRS Text
Title: A B757-200 BRAKE WAS CHKED ON ARR WHEN HOT AND SIGNED OFF WITHIN LIMITS. AN FAA SAFETY INSPECTOR CHKED BRAKE WHEN COLD, FOUND OUT OF LIMITS.
Narrative: PROB AROSE UPON RAMP CHK OF ACFT X OVERNIGHT CHK. WX AT 3 16 HR DAYS IN A ROW, DARK AND MISTY RAIN. FAA RAMP CHKED ACFT. A40 BRAKE R2R. LONG HRS, LOW LIGHT, CHKED BRAKE WHEN HOT. ACFT WAS MOVED FROM GATE TO HANGAR WHICH COULD CAUSE A REPOSITIONING OF THE BRAKE DISCS RESULTING IN CONFLICTING MEASUREMENTS OF BRAKE WEAR PIN. ALSO, BRAKE WAS HOT WHEN CHKED WHICH CAUSES METAL TO EXPAND AND COLD WHEN CHKED BY FAA 9 HRS LATER WHICH CAUSES METAL TO CONTRACT.
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.