AD/F27/131 Amdt 1 - AN - Bolts (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

Fokker F27 Series Aeroplanes

AD/F27/131 Amdt 1

AN - Bolts 2/94

Applicability: Model F27 aircraft (except Mk 050), with serial numbers listed in Fokker Service Bulletin F27/51-10 Revision 2.

Requirement: Accomplish the following:

1. Replace the affected eight (8) AN-bolts part number AN178-13A and four (4) AN- bolts part number AN178-26A in the nacelle brace installation (IPC Chapter 2B14300, items 15, 23, and 24) with bolts part number NAS1308-11D and part number NAS1308-34D, respectively; and replace the eight (8) AN-bolts part number AN178-26A that attach the engine mount to the nacelle firewall with bolts part number NAS1308-34D, in accordance with Engineering Modification Instruction (EMI) No. 171, as detailed in Fokker Service Bulletin F27/51-10 Revision 2.

b. In the connection between the nose landing gear bracket and the forward pressure bulkhead, replace AN-bolt part number AN7-14A with bolt part number NAS1307-15D, replace AN-bolt part number AN7-16A with bolt part number NAS1307-19D, replace three AN-bolts part number AN8-16A with bolts part number NAS1308-17D, and replace AN-bolt part number AN8-17A with bolt part number NAS1308-19D, in accordance with Figure No. 7 in Fokker Service Bulletin F27/51-10 Revision 2.

Note: RLD AD 91-111/2 (A) refers.

Compliance: Prior to 1 January 1995.

Background: A number of AN-bolts are located in places which are critical to the safety of flight. This Directive requires replacement of such bolts with bolts which are manufactured to a superior specification.

Amendment 1 is issued to align with a revision of the related RLD AD which now requires the replacement of a limited number of specific AN-bolts.