<< >> NASA ASRS Report 602557, November 2003

A B737-400 was dispatched after a flap control unit was replaced. Technicians who replaced unit question whether the input crank nut was torqued.

Attributes
ACN	602557
Time
Date	200311
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	ground : parked ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
Experience	maintenance technician : 50
ASRS Report	602557
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other other : person 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure contributing factor : briefing contributing factor : work cards performance deficiency : installation
Supplementary
Problem Areas	Aircraft Chart Or Publication Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

On nov/thu/03 myself and another technician installed a flap control unit using maintenance manual. A couple weeks later the technician that removed the unit questioned me about input crank bolt being difficult to access. On dec/sun/03, I discussed this with the other technician that assisted on installation and we could not remember tightening the bolt in question. On dec/sun/03, we contacted our maintenance control to request a technical service item against aircraft to rechk security of bolt in question. Maintenance manual abc sub task 123, step #8. It was determined on the night of dec/sun/03 that bolt was tight. I fault myself for not signing turn-over report up to the step I completed instead of signing off complete installation.

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Original NASA ASRS Text

Title: A B737-400 WAS DISPATCHED AFTER A FLAP CTL UNIT WAS REPLACED. TECHNICIANS WHO REPLACED UNIT QUESTION WHETHER THE INPUT CRANK NUT WAS TORQUED.

Narrative: ON NOV/THU/03 MYSELF AND ANOTHER TECHNICIAN INSTALLED A FLAP CTL UNIT USING MAINT MANUAL. A COUPLE WKS LATER THE TECHNICIAN THAT REMOVED THE UNIT QUESTIONED ME ABOUT INPUT CRANK BOLT BEING DIFFICULT TO ACCESS. ON DEC/SUN/03, I DISCUSSED THIS WITH THE OTHER TECHNICIAN THAT ASSISTED ON INSTALLATION AND WE COULD NOT REMEMBER TIGHTENING THE BOLT IN QUESTION. ON DEC/SUN/03, WE CONTACTED OUR MAINT CTL TO REQUEST A TECHNICAL SVC ITEM AGAINST ACFT TO RECHK SECURITY OF BOLT IN QUESTION. MAINT MANUAL ABC SUB TASK 123, STEP #8. IT WAS DETERMINED ON THE NIGHT OF DEC/SUN/03 THAT BOLT WAS TIGHT. I FAULT MYSELF FOR NOT SIGNING TURN-OVER RPT UP TO THE STEP I COMPLETED INSTEAD OF SIGNING OFF COMPLETE INSTALLATION.

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.