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A 777-200 aircraft with ge-90 engines sustained damage to the #1 engine heat blanket due to missing borescope plug.
| Attributes | |
| ACN | 732303 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Controlling Facilities | tracon : rksi.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 20 |
| ASRS Report | 732303 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 2 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals performance deficiency : installation performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On mar/thu/07 I was informed aircraft XXX had sustained damage to the #1 engine heat blanket; caused by suspect borescope plug (right) missing; which was discovered in ZZZ1. 2 days earlier; I inspected reinstallation of plug and believe it was installed in accordance with all of the required work card parameters. Callback conversation with reporter revealed the following information: reporter stated the missing combustion case borescope plug was noted at downline overnight station when maintenance opened inboard engine cowl for routine service. Cowling inner heat shield blanket material was damaged but; did not burn through the cowling. Reporter also stated the MM picture that reference's the location of the missing plug is vague at best . The clocking position diagram is approximately 15 degrees off from the plug's true location. This same plug is also under a metal heat shield.
Original NASA ASRS Text
Title: A 777-200 ACFT WITH GE-90 ENGINES SUSTAINED DAMAGE TO THE #1 ENGINE HEAT BLANKET DUE TO MISSING BORESCOPE PLUG.
Narrative: ON MAR/THU/07 I WAS INFORMED ACFT XXX HAD SUSTAINED DAMAGE TO THE #1 ENG HEAT BLANKET; CAUSED BY SUSPECT BORESCOPE PLUG (R) MISSING; WHICH WAS DISCOVERED IN ZZZ1. 2 DAYS EARLIER; I INSPECTED REINSTALLATION OF PLUG AND BELIEVE IT WAS INSTALLED IN ACCORDANCE WITH ALL OF THE REQUIRED WORK CARD PARAMETERS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED THE MISSING COMBUSTION CASE BORESCOPE PLUG WAS NOTED AT DOWNLINE OVERNIGHT STATION WHEN MAINT OPENED INBOARD ENGINE COWL FOR ROUTINE SERVICE. COWLING INNER HEAT SHIELD BLANKET MATERIAL WAS DAMAGED BUT; DID NOT BURN THROUGH THE COWLING. REPORTER ALSO STATED THE MM PICTURE THAT REFERENCE'S THE LOCATION OF THE MISSING PLUG IS VAGUE AT BEST . THE CLOCKING POSITION DIAGRAM IS APPROXIMATELY 15 DEGREES OFF FROM THE PLUG'S TRUE LOCATION. THIS SAME PLUG IS ALSO UNDER A METAL HEAT SHIELD.
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.