A DC10-30 was released for service after an engine change with the required fan vibration check for ...

Attributes
ACN	419980
Time
Date	199811
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zzz airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Flight Phase	other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	419980
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical non adherence : far non adherence : published procedure
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	other Other
Supplementary
Air Traffic Incident	other

Narrative:

Working in the engine shop we received a callout to replace a pair of blades. The engine was a spare in the shop. We replaced the blade per the maintenance manual. We did, however, use the wrong paperwork and did not call out a power run. The paperwork we used was for a -6 engine and no run is required unless 4 blade sets are replaced. On a -50, a power run will be done with any blade change. The problem was discovered when the aircraft the engine was hung on developed an engine vibration. The paperwork was checked and they discovered that the blades were changed but no run was done. It was discovered that the starter had fallen off and the starter duct broken. Both were replaced and the high power run accomplished with no vibration noted. We simply use the wrong paperwork for the job. We confused a -6 and a -50.

Original NASA ASRS Text

Title: A DC10-30 WAS RELEASED FOR SVC AFTER AN ENG CHANGE WITH THE REQUIRED FAN VIBRATION CHK FOR BLADE REPLACEMENT NOT ACCOMPLISHED.

Narrative: WORKING IN THE ENG SHOP WE RECEIVED A CALLOUT TO REPLACE A PAIR OF BLADES. THE ENG WAS A SPARE IN THE SHOP. WE REPLACED THE BLADE PER THE MAINT MANUAL. WE DID, HOWEVER, USE THE WRONG PAPERWORK AND DID NOT CALL OUT A PWR RUN. THE PAPERWORK WE USED WAS FOR A -6 ENG AND NO RUN IS REQUIRED UNLESS 4 BLADE SETS ARE REPLACED. ON A -50, A PWR RUN WILL BE DONE WITH ANY BLADE CHANGE. THE PROB WAS DISCOVERED WHEN THE ACFT THE ENG WAS HUNG ON DEVELOPED AN ENG VIBRATION. THE PAPERWORK WAS CHKED AND THEY DISCOVERED THAT THE BLADES WERE CHANGED BUT NO RUN WAS DONE. IT WAS DISCOVERED THAT THE STARTER HAD FALLEN OFF AND THE STARTER DUCT BROKEN. BOTH WERE REPLACED AND THE HIGH PWR RUN ACCOMPLISHED WITH NO VIBRATION NOTED. WE SIMPLY USE THE WRONG PAPERWORK FOR THE JOB. WE CONFUSED A -6 AND A -50.

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.

A DC10-30 was released for service after an engine change with the required fan vibration check for blade replacement not accomplished.