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A B757-200 #8 main tire was deferred for 3 cycles due to low pressure. Tire was deferred inadvertently using nose gear tire limits.
| Attributes | |
| ACN | 661435 |
| Time | |
| Date | 200506 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician oversight : coordinator |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 661435 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On walkaround; flight crew advised me by phone r-hand main landing gear outboard aft tire pressure low and #8 tire 110 psi. I contacted local contract maintenance to check pressure with a calibrated gauge. Tire pressure was 120 psi. I then checked the maintenance manual limits. My error was I used the nose landing gear tire pressure limits and deferred tire for 3 cycles. The main landing gear tire limits required the tire to be replaced and the mate could be deferred for 3 cycles. The aircraft continued to the next station with no problems and both tires were replaced.
Original NASA ASRS Text
Title: A B757-200 #8 MAIN TIRE WAS DEFERRED FOR 3 CYCLES DUE TO LOW PRESSURE. TIRE WAS DEFERRED INADVERTENTLY USING NOSE GEAR TIRE LIMITS.
Narrative: ON WALKAROUND; FLT CREW ADVISED ME BY PHONE R-HAND MAIN LNDG GEAR OUTBOARD AFT TIRE PRESSURE LOW AND #8 TIRE 110 PSI. I CONTACTED LCL CONTRACT MAINT TO CHK PRESSURE WITH A CALIBRATED GAUGE. TIRE PRESSURE WAS 120 PSI. I THEN CHKED THE MAINT MANUAL LIMITS. MY ERROR WAS I USED THE NOSE LNDG GEAR TIRE PRESSURE LIMITS AND DEFERRED TIRE FOR 3 CYCLES. THE MAIN LNDG GEAR TIRE LIMITS REQUIRED THE TIRE TO BE REPLACED AND THE MATE COULD BE DEFERRED FOR 3 CYCLES. THE ACFT CONTINUED TO THE NEXT STATION WITH NO PROBS AND BOTH TIRES WERE REPLACED.
Data retrieved from NASA's ASRS site as of January 2009 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.