A B747-200 right aileron was incorrectly balanced after repair.

Attributes
ACN	348357
Time
Date	199609
Day	Thu
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	B747-100
Operating Under FAR Part	Part 121
Flight Phase	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	348357
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	348068
Events
Anomaly	non adherence : far non adherence : published procedure other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other

Narrative:

During a weight and balance of a right outboard aileron, it was found to be tail heavy. A misinterp of the structural repair manual-maintenance manual was done. Balancing the aileron in a slight tail heavy condition when it should be in a nose heavy condition. The problem could be solved by a better explanation of the aileron to be in a nose heavy condition when repairs and weight and balance are complete. Problem was found while balancing another aileron.

Original NASA ASRS Text

Title: A B747-200 R AILERON WAS INCORRECTLY BALANCED AFTER REPAIR.

Narrative: DURING A WT AND BAL OF A R OUTBOARD AILERON, IT WAS FOUND TO BE TAIL HVY. A MISINTERP OF THE STRUCTURAL REPAIR MANUAL-MAINT MANUAL WAS DONE. BALANCING THE AILERON IN A SLIGHT TAIL HVY CONDITION WHEN IT SHOULD BE IN A NOSE HVY CONDITION. THE PROB COULD BE SOLVED BY A BETTER EXPLANATION OF THE AILERON TO BE IN A NOSE HVY CONDITION WHEN REPAIRS AND WT AND BAL ARE COMPLETE. PROB WAS FOUND WHILE BALANCING ANOTHER AILERON.

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.