Adhesive Change
It has been brought to our attention that the Dayton-Granger adhesive referenced in the AMM may cause corrosion between the static wick base and the aluminum skin of the aircraft. AMM Reference, 23-60-00 page 401 item 2.-B.-(2). Replace the adhesive/sealant (Dayton-Granger P/N) P/B 16307 with (Dayton-Granger P/N) P/B 15348.
This change will be incorporated in the next revision of the AMM
Wednesday, January 30, 2008
Saturday, September 1, 2007
FYI
Neither the manufacturer, IAI, nor its product support division (Worthington Aviation) can mandate the compliance of any service bulletin regardless of its designation (either “optional”, “recommended” or “mandatory”) with these exceptions:
1. Service Letters or bulletins, which are incorporated into the current manufacturer’s maintenance manual and /or assure continuous airworthiness. Example: SB1124 -55-020, found in the 1124 AMM, 5-20-06.
2. Service Letters or bulletins which are referenced in current FAA Airworthiness Directives
3. Service Letters or bulletins which are incorporated as part of the type certificate data sheets for the aircraft, engines, etc. The classification of service data by manufacturers with words such as ”optional”,” recommended “or “ mandatory” Should be perceived only as a measure of importance placed on the publication for the operators benefit. Please note that Worthington Aviation does not utilize the “mandatory” classification on any service publications.
In summary, 1121, 1123, 1124 and 1124A operators are obligated by FAA regulations to comply with a manufacturers service publication only if it is presented in one of the above three categories
1. Service Letters or bulletins, which are incorporated into the current manufacturer’s maintenance manual and /or assure continuous airworthiness. Example: SB1124 -55-020, found in the 1124 AMM, 5-20-06.
2. Service Letters or bulletins which are referenced in current FAA Airworthiness Directives
3. Service Letters or bulletins which are incorporated as part of the type certificate data sheets for the aircraft, engines, etc. The classification of service data by manufacturers with words such as ”optional”,” recommended “or “ mandatory” Should be perceived only as a measure of importance placed on the publication for the operators benefit. Please note that Worthington Aviation does not utilize the “mandatory” classification on any service publications.
In summary, 1121, 1123, 1124 and 1124A operators are obligated by FAA regulations to comply with a manufacturers service publication only if it is presented in one of the above three categories
ATA 27
We continue to find flap vanes not shimmed correctly. This condition will and does cause the potted inserts to fail which causes the forward vane rib and spar to crack. Vane replacement is very expensive. The correct way to install a vane is detailed in chapter 27-50-00, giving the correct amount of shimming washers. If the brackets seem to be under a spread pre-load, adjust the shims to correct. Remember that the instructions call out to re-install the same amount of shims previously removed –“BUT”- this is correct only if the previous technician installed the vane correctly.
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