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Two airline mechanics; contracted by their carrier to perform maintenance on a different company's B747-400 with ge CF6-80C engines; follow instructions by a senior mechanic to lock out the #3 engine reverser.
| Attributes | |
| ACN | 804394 |
| Time | |
| Date | 200808 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 804394 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 804396 |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : non compliance with mel maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 1 & 2 |
| Resolutory Action | none taken : detected after the fact |
| Factors | |
| Maintenance | contributing factor : briefing performance deficiency : non compliance with legal requirements performance deficiency : training performance deficiency : logbook entry performance deficiency : installation |
| Supplementary | |
| Problem Areas | Company Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
Under direction of senior mechanic; I opened the fan cowl of #3 engine with another mechanic and performed lockout procedure as instructed. Supplemental information from acn 804396: directed to assist mechanic in inoperative'ing thrust reverser. I would like to be trained on the general electric engines. Callback conversation with reporter acn 804394 revealed the following information: reporter stated they followed instructions from a senior mechanic on procedures to lockout the #3 engine reverser. Reporter stated neither he; nor the second mechanic; were familiar with the ge CF6-80C type engines on the B747-400. These ge engine reversers are pneumatically operated; compared with the pw 4000 engines; which move hydraulically. Reporter stated the senior mechanic had pulled; but failed to collar the reverser circuit breaker as required by the maintenance manual. This was noticed by the downline maintenance station. Reporter stated he was the one who signed off the paperwork for accomplishing the reverser lockout procedure.
Original NASA ASRS Text
Title: TWO AIRLINE MECHANICS; CONTRACTED BY THEIR CARRIER TO PERFORM MAINT ON A DIFFERENT COMPANY'S B747-400 WITH GE CF6-80C ENGINES; FOLLOW INSTRUCTIONS BY A SENIOR MECHANIC TO LOCK OUT THE #3 ENGINE REVERSER.
Narrative: UNDER DIRECTION OF SENIOR MECH; I OPENED THE FAN COWL OF #3 ENG WITH ANOTHER MECH AND PERFORMED LOCKOUT PROC AS INSTRUCTED. SUPPLEMENTAL INFO FROM ACN 804396: DIRECTED TO ASSIST MECH IN INOP'ING THRUST REVERSER. I WOULD LIKE TO BE TRAINED ON THE GENERAL ELECTRIC ENGS. CALLBACK CONVERSATION WITH RPTR ACN 804394 REVEALED THE FOLLOWING INFO: REPORTER STATED THEY FOLLOWED INSTRUCTIONS FROM A SENIOR MECHANIC ON PROCEDURES TO LOCKOUT THE #3 ENGINE REVERSER. REPORTER STATED NEITHER HE; NOR THE SECOND MECHANIC; WERE FAMILIAR WITH THE GE CF6-80C TYPE ENGINES ON THE B747-400. THESE GE ENGINE REVERSERS ARE PNEUMATICALLY OPERATED; COMPARED WITH THE PW 4000 ENGINES; WHICH MOVE HYDRAULICALLY. REPORTER STATED THE SENIOR MECHANIC HAD PULLED; BUT FAILED TO COLLAR THE REVERSER CIRCUIT BREAKER AS REQUIRED BY THE MAINT MANUAL. THIS WAS NOTICED BY THE DOWNLINE MAINT STATION. REPORTER STATED HE WAS THE ONE WHO SIGNED OFF THE PAPERWORK FOR ACCOMPLISHING THE REVERSER LOCKOUT PROCEDURE.
Data retrieved from NASA's ASRS site as of May 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.