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AD/B737/235 Amdt 1 - Fuselage Skin Area at the Dorsal Fin Assembly
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Boeing 737 Series Aeroplanes
| AD/B737/235 Amdt 1 | Fuselage Skin Area at the Dorsal Fin Assembly | 6/2009 |
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| Applicability: | All Model 737-300, -400, and -500 series aircraft. |
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| Requirement: | Action in accordance with the technical requirements of FAA AD 2009-07-11 Amdt 39-15870.Note: Boeing Alert Service Bulletin 737-53A1266 original issue, or later FAA approved revision, and Boeing Message Number 1-QX035, dated 13 October 2004, refer. |
| Compliance: | As specified in the Requirement document, with a revised effective date of4 June 2009. |
| This Amendment becomes effective on 4 June 2009. | |
| Background: | The FAA received a report of an 18-inch crack found in the fuselage skin area under the blade seals of the nose cap of the dorsal fin due to previous wear damage. Such damage could result in fatigue cracking due to cabin pressurisation, and consequent rapid in-flight decompression of the aircraft fuselage.Amendment 1 is issued in response to a new FAA AD, which introduces an inspection for any chafing or cracking in the fuselage skin and abrasion resistant coating at the dorsal fin landing, an inspection for damage to the dorsal fin seals, attach clip, and seal retainer, and other specified and corrective actions as necessary. The new requirements will end the need for the existing repetitive inspections. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
17 April 2009