Commonwealth legislation

AD/B737/355 - Forward Airstair Doorway Backup Intercostals and Upper Sill Web

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This Airworthiness Directive requires operators of certain Boeing 737-100/200/200C/300/400/500 series aeroplanes to carry out inspections and any necessary corrective action on the forward airstair doorway backup intercostals and upper sill web, following the technical requirements of FAA AD 2009-09-06 and Boeing Alert Service Bulletin 737-53A1269.

CASA makes the directive effective 2 July 2009 after reports of fatigue cracking that could cause rapid cabin decompression; affected operators bear the cost and must follow the referenced FAA/Boeing procedures.

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Current sections

Direct links to the current provisions in AD/B737/355 - Forward Airstair Doorway Backup Intercostals and Upper Sill Web.

Boeing 737 Series Aeroplanes

AD/B737/355	Forward Airstair Doorway BackupIntercostals and Upper Sill Web	7/2009

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.
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

AD/B737/355

Forward Airstair Doorway BackupIntercost

Forward Airstair Doorway BackupIntercostals and Upper Sill Web

Forward Airstair Doorway Backup

Intercostals and Upper Sill Web

7/2009

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

Boeing 737 Series Aeroplanes Boeing 737 Series Aeroplanes

Boeing 737 Series Aeroplanes

AD/B737/355	Forward Airstair Doorway BackupIntercostals and Upper Sill Web	7/2009

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.
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.

David Villiers
Delegate of the Civil Aviation Safety Authority

22 May 2009

AD/B737/355 AD/B737/355

AD/B737/355

Forward Airstair Doorway BackupIntercost Forward Airstair Doorway BackupIntercostals and Upper Sill Web

Forward Airstair Doorway Backup

Intercostals and Upper Sill Web

Deep dive

Current sections

Boeing 737 Series Aeroplanes

Boeing 737 Series Aeroplanes

AD/B737/355

AD/B737/355

Forward Airstair Doorway BackupIntercostals and Upper Sill Web

Forward Airstair Doorway Backup

7/2009

7/2009

Source text

Boeing 737 Series Aeroplanes Boeing 737 Series Aeroplanes

Boeing 737 Series Aeroplanes

AD/B737/355 AD/B737/355

AD/B737/355

Forward Airstair Doorway BackupIntercost Forward Airstair Doorway BackupIntercostals and Upper Sill Web

Forward Airstair Doorway Backup

7/2009 7/2009

7/2009