A B757-200 #1 engine was checked for oil leakage per the maintenance manual. No leaks found. Technician failed to enter required 25 hour rechk.

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Attributes
ACN	649014
Time
Date	200502
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance supervisor : 6 maintenance technician : 6
ASRS Report	649014
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : #1 oil qty indicator other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : work cards contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : logbook entry
Supplementary
Problem Areas	Maintenance Human Performance Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

During oil service of #1 engine; the amt reported oil leaking from under that engine. I found the gang drains dry; but the area around the housing appeared wet. It looked as if oil had been split during servicing. The amt was concerned so we agreed to perform a 5 min idle to locate the source. The area around the gang drain was dried. The motor was opened up and no leaks were apparent around the gear box or any other component. The #1 motor was run for 5 mins and no oil leak was found. The error occurred when I was provided with the maintenance manual page X dealing with oil leaks and limits. Per this document; no leaks were found and I attributed the leak to poor servicing. However; page Y of the maintenance manual states that if no oil leak is found; create a carry forward item for rechk within 25 hours. I did not see this page at the time of the signoff; so I was unaware that an item needed to be input into the computer. I should have pulled up the entire maintenance manual myself; then this would not have happened.

Original NASA ASRS Text

Title: A B757-200 #1 ENG WAS CHKED FOR OIL LEAKAGE PER THE MAINT MANUAL. NO LEAKS FOUND. TECHNICIAN FAILED TO ENTER REQUIRED 25 HR RECHK.

Narrative: DURING OIL SVC OF #1 ENG; THE AMT RPTED OIL LEAKING FROM UNDER THAT ENG. I FOUND THE GANG DRAINS DRY; BUT THE AREA AROUND THE HOUSING APPEARED WET. IT LOOKED AS IF OIL HAD BEEN SPLIT DURING SVCING. THE AMT WAS CONCERNED SO WE AGREED TO PERFORM A 5 MIN IDLE TO LOCATE THE SOURCE. THE AREA AROUND THE GANG DRAIN WAS DRIED. THE MOTOR WAS OPENED UP AND NO LEAKS WERE APPARENT AROUND THE GEAR BOX OR ANY OTHER COMPONENT. THE #1 MOTOR WAS RUN FOR 5 MINS AND NO OIL LEAK WAS FOUND. THE ERROR OCCURRED WHEN I WAS PROVIDED WITH THE MAINT MANUAL PAGE X DEALING WITH OIL LEAKS AND LIMITS. PER THIS DOCUMENT; NO LEAKS WERE FOUND AND I ATTRIBUTED THE LEAK TO POOR SVCING. HOWEVER; PAGE Y OF THE MAINT MANUAL STATES THAT IF NO OIL LEAK IS FOUND; CREATE A CARRY FORWARD ITEM FOR RECHK WITHIN 25 HRS. I DID NOT SEE THIS PAGE AT THE TIME OF THE SIGNOFF; SO I WAS UNAWARE THAT AN ITEM NEEDED TO BE INPUT INTO THE COMPUTER. I SHOULD HAVE PULLED UP THE ENTIRE MAINT MANUAL MYSELF; THEN THIS WOULD NOT HAVE HAPPENED.

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.