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AD/B747/354 - Crown Crease Beam
Boeing 747 Series AeroplanesBoeing 747 Series Aeroplanes
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Boeing 747 Series Aeroplanes
| AD/B747/354 | Crown Crease Beam | 3/2007 |
|---|
| Applicability: | Model 747-100B SUD, -200B, -300, -400, -400D, and 747SP series aircraft; as identified in Boeing Alert Service Bulletin 747-53A2591 original issue, or later FAA approved revision. |
|---|---|
| Requirement: | Action in accordance with the technical requirements of FAA AD 2007-01-09 Amdt 39-14881. |
| Compliance: | As specified in the Requirement document, with a revised effective date of15 March 2007. |
| This Airworthiness Directive becomes effective on 15 March 2007. | |
| Background: | The FAA received a report of cracking of the crown crease beam on two Model 747 aircraft. Such cracking, unless detected and corrected, could expand and result in depressurisation and inability of the airframe structure to sustain flight loads. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
1 February 2007