AMOC, AD 89-12-08

Attached is a link to the FAA AMOC for the inspection criteria for the Titanium Spar Splice. (AD89-12-08)
LINK

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Horizontal Stabilizer Aft Fitting inspection: Worthington Aviation has requested and has received an Alternate Method Of Compliance (AMOC) for Airworthiness Directive (AD) 89-12-08. This AD concerns the inspection criteria for the horizontal stabilizer splice (aluminum). The AD states, (paragraph C) “if cracks are found, replace the splice fitting prior to further flight, in accordance with the following IAI Service Bulletin entitled “Horizontal Stabilizer Assembly –Inspection, Repair and Improvement (AFC 2037), as appropriate”. The Service Bulletins listed do no reference the replacement of the fitting with the titanium fitting (453005-509) hence the continued inspection criteria remains in the body of the AD (paragraph B).
Since then IAI has come out with the -509 titanium fitting and had changed the AMM Ch 5 to reflect the changed times for inspection for this part.
This AMOC references the -509 titanium fitting and the changed inspection times for this fitting.

Please refer to the IAI AMM 5-20-06 pg 202
Contact Worthington for a copy of the AMOC for your records (ANM-116-08-212)

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When completing the installation of the flap actuators please accomplish all of the tests outlined in 27-50-00. This will help you have a smooth installation after accomplishing the prep work that is outlined in the AMM.

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Horizontal pitch trim rod end adjustments are distinctly different even though the actuator itself is the same for both part numbers (543502-1 for the 1124 and 543502-501 for the 1123 and 1124A). Due to the critical nature of the adjustment, ordering and installing the correct unit cannot be over emphasized. The proper adjustment and configuration is preset and the parts marked accordingly on all Worthington Aviation stock actuators.

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Banjo Fitting
When accomplishing Service Bulletin 1124-55-148 R1, be very careful when drilling out the fasteners along the Station 521.750 frame, also known as the banjo fitting. We have seen several instances of technicians allowing the drill bit to go in too far, damaging the frame face. Also, when replacing the fasteners, use Hi-Loks instead of MS20470e6 series rivets, which are really hard to buck in such a confined area without damaging surrounding structure with the bucking bar.