A B737-500 right engine starter was replaced for oil leakage. During installation of starter technician may have failed to install outer 'O' ring seal.

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Attributes
ACN	715325
Time
Date	200610
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	715325
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : right engine oil qty indicator other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : lighting performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : installation performance deficiency : testing
Supplementary
Problem Areas	Maintenance Human Performance Environmental Factor
Primary Problem	Maintenance Human Performance

Narrative:

During #2 engine starter removal due to oil leak from mounting pad; while installing garlock seal I think I forgot to install 'O' ring which goes on outer diameter of garlock seal. During idle run there was no leak. After aircraft left I realized I might have not installed 'O' ring.

Original NASA ASRS Text

Title: A B737-500 R ENG STARTER WAS REPLACED FOR OIL LEAKAGE. DURING INSTALLATION OF STARTER TECHNICIAN MAY HAVE FAILED TO INSTALL OUTER 'O' RING SEAL.

Narrative: DURING #2 ENG STARTER REMOVAL DUE TO OIL LEAK FROM MOUNTING PAD; WHILE INSTALLING GARLOCK SEAL I THINK I FORGOT TO INSTALL 'O' RING WHICH GOES ON OUTER DIAMETER OF GARLOCK SEAL. DURING IDLE RUN THERE WAS NO LEAK. AFTER ACFT LEFT I REALIZED I MIGHT HAVE NOT INSTALLED 'O' RING.

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.