Wrong weight and balance computations.

Attributes
ACN	298245
Time
Date	199503
Day	Tue
Place
Locale Reference	airport : zzz
State Reference	US
Aircraft 1
Operator	other
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Flight Phase	other
Person 1
Affiliation	Other
Function	other personnel
Qualification	other other : other
ASRS Report	298245
Events
Anomaly	aircraft equipment problem : less severe non adherence : far other anomaly other
Independent Detector	other other : unspecified
Resolutory Action	none taken : detected after the fact other
Consequence	Other
Supplementary
Primary Problem	Chart Or Publication
Air Traffic Incident	other

Narrative:

I am employed by a large modification shop. Our primary work is an stc for beechcraft bonanzas, stc is several yrs old. Recently discovered that stc approved weight and balance information is incorrect. This was discovered due to new stc for additional aircraft much heavier. New numbers are being calculated and owners are being informed. Stc weight and balance will be amended. Original developer of stc was not thorough with calculations.

Original NASA ASRS Text

Title: WRONG WT AND BAL COMPUTATIONS.

Narrative: I AM EMPLOYED BY A LARGE MODIFICATION SHOP. OUR PRIMARY WORK IS AN STC FOR BEECHCRAFT BONANZAS, STC IS SEVERAL YRS OLD. RECENTLY DISCOVERED THAT STC APPROVED WT AND BAL INFO IS INCORRECT. THIS WAS DISCOVERED DUE TO NEW STC FOR ADDITIONAL ACFT MUCH HEAVIER. NEW NUMBERS ARE BEING CALCULATED AND OWNERS ARE BEING INFORMED. STC WT AND BAL WILL BE AMENDED. ORIGINAL DEVELOPER OF STC WAS NOT THOROUGH WITH CALCULATIONS.

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.