CTHIn ForceLegislation
AD/B747/128 Amdt 3 - Lower Lobe Lap Joints at Wing to Body Fairing
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
Start here
Get a plain-English read of Boeing 747 Series Aeroplanes
Turn the raw legal text into a practical explanation grounded in AD/B747/128 Amdt 3 - Lower Lobe Lap Joints at Wing to Body Fairing.
Boeing 747 Series Aeroplanes
| AD/B747/128 Amdt 3 | Lower Lobe Lap Joints at Wing to Body Fairing | 11/2008 DM |
|---|
| Applicability: | Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, 747SR, and 747SP series airplanes, certificated in any category, as identified in Boeing Alert Service Bulletin 747-53A2312, Revision 3, dated February 8, 2007 or later FAA approved revision. |
|---|---|
| Requirement: | Action in accordance with the technical requirements of FAA AD 2008-16-14 Amdt39-15632.Note: Boeing Alert Service Bulletin (ASB) 747-53A2312 Revision 3 or later FAA approved revision refers. |
| Compliance: | As specified in the requirement document. |
| This Amendment becomes effective on 17 September 2008. | |
| Background: | This Directive was prompted by reports of cracking in the stringer 34 lap joint near the interface with the wing-to-body fairing. This condition, if not corrected, could result in an in-flight depressurisation of the aircraft.Amendment 1 reduced the number of aircraft to be inspected and widened the inspection area to include all lap splice upper rows under the wing-to-body fairing.Amendment 2 allowed use of ASB 747-53A2312 Revision 3 as an alternative method of compliance with the requirements of FAA AD 94-15-06.Amendment 3 is issued to change the requirement document. FAA AD 94-15-06 Amdt 39-8977 is superseded by FAA AD 2008-16-14 Amdt 39-15632. This results in a change to the High Frequency Eddy Current inspection method due to possible faulty results when inspecting Alodine-coated rivets; adds an additional one time inspection for cracking; and terminates the adjusting factor for the inspection compliance times based on cabin differential pressure. |
Image unavailable in extracted text
David Villiers
Delegate of the Civil Aviation Safety Authority
18 August 2008