Aircraft equipment problem. Borescope plug missing. Reporter mechanic, unfamiliar with aircraft type...

Attributes
ACN	338095
Time
Date	199606
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	338095
Events
Anomaly	aircraft equipment problem : less severe non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I am a mechanic at an airlines at the Y facility. On jun/tue/96 I was given job to install the borescope plugs on the #4 engine on a B747-400 aircraft nose. I normally do not work on B747's and I am not very familiar with them. I am currently assigned to a B757 dock. This particular day I was working overtime and had been assigned to a B747 dock that was low on manpower. On the night of jun/thu/96, I was off from work but received a phone call at home. I was told that the aircraft on route to XXX experienced intermittent fire warning lights, they did not have to shut down the engine. Upon inspection on the ground they discovered 1 borescope plug missing. I do recall performing the job although off hand I cannot recall every plug that I put in. There were several of them to be installed, I did install every borescope plug I found to have been taken out, I put anti-seize on the threads, I torqued them, and I safety wired them. After I installed them, I counted the ones I put in and that number did coincide with the amount called out in the job card. When I was through I went over the engine to see if there was anything I missed, when I was satisfied that there wasn't, I signed it off.

Original NASA ASRS Text

Title: ACFT EQUIP PROB. BORESCOPE PLUG MISSING. RPTR MECH, UNFAMILIAR WITH ACFT TYPE, WAS ASSIGNED JOB OF INSTALLING BORESCOPE PLUGS. RPTR SAYS THAT THE NUMBER OF PLUGS HE INSTALLED COINCIDED WITH THE AMOUNT SHOWN ON THE JOB CARD. AFTER ACFT WAS IN FLT THEY HAD INTERMITTENT FIRE WARNINGS AND ON POST FLT INSPECTION A BORESCOPE PLUG MISSING.

Narrative: I AM A MECH AT AN AIRLINES AT THE Y FACILITY. ON JUN/TUE/96 I WAS GIVEN JOB TO INSTALL THE BORESCOPE PLUGS ON THE #4 ENG ON A B747-400 ACFT NOSE. I NORMALLY DO NOT WORK ON B747'S AND I AM NOT VERY FAMILIAR WITH THEM. I AM CURRENTLY ASSIGNED TO A B757 DOCK. THIS PARTICULAR DAY I WAS WORKING OVERTIME AND HAD BEEN ASSIGNED TO A B747 DOCK THAT WAS LOW ON MANPOWER. ON THE NIGHT OF JUN/THU/96, I WAS OFF FROM WORK BUT RECEIVED A PHONE CALL AT HOME. I WAS TOLD THAT THE ACFT ON RTE TO XXX EXPERIENCED INTERMITTENT FIRE WARNING LIGHTS, THEY DID NOT HAVE TO SHUT DOWN THE ENG. UPON INSPECTION ON THE GND THEY DISCOVERED 1 BORESCOPE PLUG MISSING. I DO RECALL PERFORMING THE JOB ALTHOUGH OFF HAND I CANNOT RECALL EVERY PLUG THAT I PUT IN. THERE WERE SEVERAL OF THEM TO BE INSTALLED, I DID INSTALL EVERY BORESCOPE PLUG I FOUND TO HAVE BEEN TAKEN OUT, I PUT ANTI-SEIZE ON THE THREADS, I TORQUED THEM, AND I SAFETY WIRED THEM. AFTER I INSTALLED THEM, I COUNTED THE ONES I PUT IN AND THAT NUMBER DID COINCIDE WITH THE AMOUNT CALLED OUT IN THE JOB CARD. WHEN I WAS THROUGH I WENT OVER THE ENG TO SEE IF THERE WAS ANYTHING I MISSED, WHEN I WAS SATISFIED THAT THERE WASN'T, I SIGNED IT OFF.

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.