AD/B747/133 - Fuselage - Upper Deck Floor Beams at BS 860 and 980
1AD/B747/133 - Fuselage - Upper Deck Floor Beams at BS 860 and 980
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COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
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Boeing 747 Series Aeroplanes
AD/B747/133 Fuselage - Upper Deck Floor Beams at BS 860 and 980
11/94
Applicability: B747-300, -400 and -100B series aircraft delivered with Stretched Upper Decks (SUD) Line numbers 570 to 843 inclusive and all aircraft modified to have SUD.
Requirement: 1. Conduct a high frequency eddy current inspection of the BS 860 and 980 upper deck floor beams at LBL 46.83 and RBL 46.83 in accordance with Boeing SB 747-53-2327 Revision 1.
- Modify the BS 860 and 980 upper deck floor beams at LBL 46.83 and RBL 46.83 in accordance with Boeing SB 747-53-2327 Revision 1 and Boeing drawing 624U0014.
Note: FAA AD 92-24-07 refers.
Compliance: 1. Inspect and modify, B747-300, -400 and -100B series aircraft delivered with SUD, before 20000 flights or within 1000 flights of 13 October 1994 whichever is the later.
- Inspect and modify B747 aircraft modified to have SUD before 20000 flights after the modification or within 1000 flights of 13 October 1994 whichever is the later.
Background: Cracking of the floor beams was experienced during the B747-400 full scale fatigue test at 35000 pressure cycles. Inspection and modification in accordance with this AD will extend the fatigue life of the floor beams.