Document ID: chunk:federal_register_of_legislation:F2020L00408:body:0:p2
Version: federal_register_of_legislation:F2020L00408
Segment Type: other
Provision Reference: 
Character Range: 2696–4008

as Gulfstream Aerospace SB 165A, that allowed operators to follow an inspection procedure or modify the ailerons. Simultaneously the FAA released AD 79-22-04 Amdt. 39-3600. The modification requires trimming the trailing edge of each aileron. Ailerons with trimmed trailing edges create much greater control forces which exceed the capability of the autopilot and permanent disconnection of the autopilot is therefore required.
                Later reports of looseness in the aileron torque tube joints of those aeroplanes modified with Gulfstream American SK-150, required Gulfstream Aerospace SB 168 to be released. In 2006, Tiger Aircraft released Service Instruction SI 06-01, an accepted FAA AD 79-22-04 alternate means of compliance. The 100 hourly inspections are eliminated by verifying the ailerons are correctly contoured. The service instructions contain details on fabricating a contour inspection template.
                This amendment is issued to update a referenced document from Gulfstream American SB 165 to Gulfstream Aerospace SB 165A and to approve the accomplishment of SI 06-01 as terminating action for the 100 hourly repetitive inspections required by both FAA AD 79-22-04 and Gulfstream American SB 165A.

Pieter van Dijk
Delegate of the Civil Aviation Safety Authority
3 April 2020