An engine shop lead technician reports that during teardown and inspection of a B737-700; aft engine mounts revealed the incorrect pawl pins were installed with no documentation authorizing installation.

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Attributes
ACN	668661
Time
Date	200508
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : lead technician
Experience	maintenance lead technician : 26
ASRS Report	668661
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Factors
Maintenance	contributing factor : manuals performance deficiency : scheduled maintenance performance deficiency : inspection performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Environmental Factor Chart Or Publication Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

We have had 2 each aft engine mount assemblies in the engine shop for tear-down and inspection. We have found pawl-pins part number XXX-a installed. Per maintenance technician; we use part number XXX-B. Per the ipc; we do not have any in changeable to use part number X. Please see ipc.

Original NASA ASRS Text

Title: AN ENG SHOP LEAD TECHNICIAN RPTS THAT DURING TEARDOWN AND INSPECTION OF A B737-700; AFT ENG MOUNTS REVEALED THE INCORRECT PAWL PINS WERE INSTALLED WITH NO DOCUMENTATION AUTHORIZING INSTALLATION.

Narrative: WE HAVE HAD 2 EACH AFT ENG MOUNT ASSEMBLIES IN THE ENG SHOP FOR TEAR-DOWN AND INSPECTION. WE HAVE FOUND PAWL-PINS PART NUMBER XXX-A INSTALLED. PER MAINT TECHNICIAN; WE USE PART NUMBER XXX-B. PER THE IPC; WE DO NOT HAVE ANY IN CHANGEABLE TO USE PART NUMBER X. PLEASE SEE IPC.

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.