A B737-500 aircraft apprentice mechanic thinks he may have safety wired the CSD internal bypass filt...

Attributes
ACN	734929
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
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	734929
Events
Anomaly	maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : briefing performance deficiency : non compliance with legal requirements performance deficiency : training performance deficiency : installation
Supplementary
Problem Areas	Company Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

While troubleshooting a problem with a CSD; I discovered that the CSD internal bypass filter had popped. I installed a new filter and leak and operations checked the system. I had to put another filter on after we cycled the system to purge and make sure there was no build-up in the system. This was done at a fast pace and being my first time performing this task; I may have safetied the case the wrong way. I have since pulled the maintenance manual procedures up and studied them. I also planned on going to maintenance training to practice safety wiring. I want to maintain a safe working environment since safety is my #1 concern.

Original NASA ASRS Text

Title: A B737-500 ACFT APPRENTICE MECHANIC THINKS HE MAY HAVE SAFETY WIRED THE CSD INTERNAL BYPASS FILTER HOUSING BACKWARDS.

Narrative: WHILE TROUBLESHOOTING A PROB WITH A CSD; I DISCOVERED THAT THE CSD INTERNAL BYPASS FILTER HAD POPPED. I INSTALLED A NEW FILTER AND LEAK AND OPS CHKED THE SYS. I HAD TO PUT ANOTHER FILTER ON AFTER WE CYCLED THE SYS TO PURGE AND MAKE SURE THERE WAS NO BUILD-UP IN THE SYS. THIS WAS DONE AT A FAST PACE AND BEING MY FIRST TIME PERFORMING THIS TASK; I MAY HAVE SAFETIED THE CASE THE WRONG WAY. I HAVE SINCE PULLED THE MAINT MANUAL PROCS UP AND STUDIED THEM. I ALSO PLANNED ON GOING TO MAINT TRAINING TO PRACTICE SAFETY WIRING. I WANT TO MAINTAIN A SAFE WORKING ENVIRONMENT SINCE SAFETY IS MY #1 CONCERN.

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.

A B737-500 aircraft apprentice mechanic thinks he may have safety wired the CSD internal bypass filter housing backwards.