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A B757-200 in maintenance check had the right nose landing gear door honeycomb delamination evaluated incorrectly. Aft part of door separated in flight.
| Attributes | |
| ACN | 670494 |
| Time | |
| Date | 200508 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 670494 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals contributing factor : lighting performance deficiency : scheduled maintenance performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On feb/xa/05; I discovered delamination on nose landing gear door (forward) on B757-200 during overnight maintenance. During my evaluation of the srm allowable damage limits; apparently I misinterped or overlooked the 0.50 maximum diameter in honeycomb area in favor of the 25% of core length per side and thought the damage was acceptable per 52-89-02. The damage was near center of door 3 inch by 4 inch area in non critical area; on exterior of door. Aft part of door separated from aircraft on aug/thu/05 doing minor damage to wing to body fairing. Aircraft OTS until door was replaced. I was notified of the incident on sep/tue/05. Contributing factors: probably fatigue and frequency of usage of srm manuals.
Original NASA ASRS Text
Title: A B757-200 IN MAINT CHK HAD THE R NOSE LNDG GEAR DOOR HONEYCOMB DELAMINATION EVALUATED INCORRECTLY. AFT PART OF DOOR SEPARATED IN FLT.
Narrative: ON FEB/XA/05; I DISCOVERED DELAMINATION ON NOSE LNDG GEAR DOOR (FORWARD) ON B757-200 DURING OVERNIGHT MAINT. DURING MY EVALUATION OF THE SRM ALLOWABLE DAMAGE LIMITS; APPARENTLY I MISINTERPED OR OVERLOOKED THE 0.50 MAX DIAMETER IN HONEYCOMB AREA IN FAVOR OF THE 25% OF CORE LENGTH PER SIDE AND THOUGHT THE DAMAGE WAS ACCEPTABLE PER 52-89-02. THE DAMAGE WAS NEAR CTR OF DOOR 3 INCH BY 4 INCH AREA IN NON CRITICAL AREA; ON EXTERIOR OF DOOR. AFT PART OF DOOR SEPARATED FROM ACFT ON AUG/THU/05 DOING MINOR DAMAGE TO WING TO BODY FAIRING. ACFT OTS UNTIL DOOR WAS REPLACED. I WAS NOTIFIED OF THE INCIDENT ON SEP/TUE/05. CONTRIBUTING FACTORS: PROBABLY FATIGUE AND FREQUENCY OF USAGE OF SRM MANUALS.
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.