During removal of the lpc drive shaft using a hand hydraulic pump; two mechanics heard a noise and noticed that one bolt and nut were still attached to the #1 bearing support on a PW2000 engine.

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Attributes
ACN	807200
Time
Date	200808
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	807200
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	806222
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other other : 1 & 2
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance
Supplementary
Problem Areas	Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

During the removal of the lpc drive shaft; missed removing 1 each attach bolt and nut at approximately 6 O'clock position on the #1 bearing support. After pumping the shaft partially out; heard a noise and stopped pumping the shaft. Investigated and found 1 bolt still installed; saw the #1 bearing support damaged. Removed the bolt and nut; then continued removing the shaft. Then notified the foreman. Supplemental information from acn 806222: during the removal of the lpc drive shaft using the hand hydraulic pump; heard a noise and stopped pumping; found 1 bolt and nut still attached to #1 bearing support. Should doublechk flange for any bolts and nuts not removed.

Original NASA ASRS Text

Title: DURING REMOVAL OF THE LPC DRIVE SHAFT USING A HAND HYDRAULIC PUMP; TWO MECHANICS HEARD A NOISE AND NOTICED THAT ONE BOLT AND NUT WERE STILL ATTACHED TO THE #1 BEARING SUPPORT ON A PW2000 ENGINE.

Narrative: DURING THE REMOVAL OF THE LPC DRIVE SHAFT; MISSED REMOVING 1 EACH ATTACH BOLT AND NUT AT APPROX 6 O'CLOCK POS ON THE #1 BEARING SUPPORT. AFTER PUMPING THE SHAFT PARTIALLY OUT; HEARD A NOISE AND STOPPED PUMPING THE SHAFT. INVESTIGATED AND FOUND 1 BOLT STILL INSTALLED; SAW THE #1 BEARING SUPPORT DAMAGED. REMOVED THE BOLT AND NUT; THEN CONTINUED REMOVING THE SHAFT. THEN NOTIFIED THE FOREMAN. SUPPLEMENTAL INFO FROM ACN 806222: DURING THE REMOVAL OF THE LPC DRIVE SHAFT USING THE HAND HYD PUMP; HEARD A NOISE AND STOPPED PUMPING; FOUND 1 BOLT AND NUT STILL ATTACHED TO #1 BEARING SUPPORT. SHOULD DOUBLECHK FLANGE FOR ANY BOLTS AND NUTS NOT REMOVED.

Data retrieved from NASA's ASRS site as of May 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.