A B737-900 during an engineering order accomplishment, the engineering order was not clear and the nuts holding the fan hub to the booster spool were loosened. Required engine change to torque nuts to specifications.

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Attributes
ACN	620821
Time
Date	200406
Day	Sun
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Person 1
Affiliation	company : air carrier
Person 2
Function	maintenance : technician
ASRS Report	620821
Events
Anomaly	aircraft equipment problem : critical 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 : engineering procedure contributing factor : work cards performance deficiency : repair performance deficiency : installation performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Aircraft Maintenance Human Performance Chart Or Publication
Primary Problem	Chart Or Publication

Narrative:

While accomplishing a fan blade lube and an engineering order to remove, clean and re-torque platform pins, a misinterp of the engineering order occurred and the 24 nuts that hold the fan hub to the booster spool were loosened. Because of that the #2 engine had to be changed and sent out to get the nuts for the fan hub and booster spool re-torqued.

Original NASA ASRS Text

Title: A B737-900 DURING AN ENGINEERING ORDER ACCOMPLISHMENT, THE ENGINEERING ORDER WAS NOT CLR AND THE NUTS HOLDING THE FAN HUB TO THE BOOSTER SPOOL WERE LOOSENED. REQUIRED ENG CHANGE TO TORQUE NUTS TO SPECS.

Narrative: WHILE ACCOMPLISHING A FAN BLADE LUBE AND AN ENGINEERING ORDER TO REMOVE, CLEAN AND RE-TORQUE PLATFORM PINS, A MISINTERP OF THE ENGINEERING ORDER OCCURRED AND THE 24 NUTS THAT HOLD THE FAN HUB TO THE BOOSTER SPOOL WERE LOOSENED. BECAUSE OF THAT THE #2 ENG HAD TO BE CHANGED AND SENT OUT TO GET THE NUTS FOR THE FAN HUB AND BOOSTER SPOOL RE-TORQUED.

Data retrieved from NASA's ASRS site as of July 2007 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.