1AD/F28/80 Amdt 1 - Frame Station 10790 Coupling Fitting Bolts

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Fokker F28 Series Aeroplanes

AD/F28/80

Amdt 1

Frame Station 10790 Coupling Fitting Bolts 13/97

Applicability: F28-1000 to -4000 Series, Serial Numbers 11003 to 11201, 11991 and 11992 with SB F28/53-125 installed.

Requirement: Action in accordance with the Instructions for Part 1 of Fokker F28 SB F28/53-143.

Note: Netherlands AD 1996-119(A) refers.

Compliance: Within 3000 flight cycles after 2 January 1996 or before 1 February 1998, whichever occurs first.

This Amendment becomes effective on 4 December 1997.

Background: A new coupling was introduced at SB F28/53-125 to replace the original 7079-T6 coupling which was subject to stress corrosion and consequent SIP inspection. It has been discovered that the torque values specified in SB F28/53-125 are below what is actually required. This directive is issued to ensure that the coupling bolts are torqued to the value specified in the requirement document.

This amendment corrects a misleading statement in the background, which referred to a steel coupling. The replacement coupling is made of 7075-T73. The compliance date has also been corrected.

The original issue of this Airworthiness Directive became effective on 2 January 1996.