CTHIn ForceLegislation
AD/B737/355 - Forward Airstair Doorway Backup Intercostals and Upper Sill Web
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AD/B737/355 - Forward Airstair Doorway Backup Intercostals and Upper Sill Web
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| AD/B737/355 | Forward Airstair Doorway BackupIntercostals and Upper Sill Web | 7/2009 |
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| Applicability: | Model 737-100, -200, -200C, -300, -400 and -500 series aircraft, as identified in Boeing Alert Service Bulletin 737-53A1269, dated 17 May 2007, or later FAA approved revision. |
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| Requirement: | Action in accordance with the technical requirements of FAA AD 2009-09-06 Amdt 39-15892. |
| Compliance: | As specified in the Requirement document, with a revised effective date of2 July 2009. |
| This Airworthiness Directive becomes effective on 2 July 2009. | |
| Background: | The FAA received a report indicating that cracks were detected in the backup intercostals and upper sill web of the forward airstair doorway. Such fatigue cracking, unless detected and corrected, could result in a rapid loss of cabin pressure. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
22 May 2009