An EMB140 APU garlock oil seal was replaced using the component maintenance manual as reference. Later found aircraft maintenance manual was to be used per engineering revision.

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Attributes
ACN	670545
Time
Date	200508
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 140 ER&LR
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	670545
Person 2
Affiliation	company : air carrier
Function	maintenance : lead technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : manuals contributing factor : work cards performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : logbook entry
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Changed garlock seal on APU with maintenance manual revision 6 on disk. Realized that there was an engineering notice instructing not to use maintenance manual revision 6 on disk. Callback conversation with reporter revealed the following information: the reporter stated the APU was replaced using the manufacturer's component maintenance manual. Later advised that engineering wanted the seal replaced with the aircraft maintenance manual chapter 49 used as reference as it has the latest revisions.

Original NASA ASRS Text

Title: AN EMB140 APU GARLOCK OIL SEAL WAS REPLACED USING THE COMPONENT MAINT MANUAL AS REF. LATER FOUND ACFT MAINT MANUAL WAS TO BE USED PER ENGINEERING REVISION.

Narrative: CHANGED GARLOCK SEAL ON APU WITH MAINT MANUAL REVISION 6 ON DISK. REALIZED THAT THERE WAS AN ENGINEERING NOTICE INSTRUCTING NOT TO USE MAINT MANUAL REVISION 6 ON DISK. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE APU WAS REPLACED USING THE MANUFACTURER'S COMPONENT MAINT MANUAL. LATER ADVISED THAT ENGINEERING WANTED THE SEAL REPLACED WITH THE ACFT MAINT MANUAL CHAPTER 49 USED AS REF AS IT HAS THE LATEST REVISIONS.

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.