AD/B737/311 Main Wheel Well Electrical Connectors and Receptacles (Cth)
AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.
Boeing 737 Series Aeroplanes
| AD/B737/311 | Main Wheel Well Electrical Connectors and Receptacles | 1/2008 |
Applicability: | Model 737-600, -700, -700C, -800 and -900 series aircraft, as identified in Boeing Special Attention Service Bulletin 737-24-1169 Revision 1, dated 6 August 2007, or later FAA approved revision. |
Requirement: | Action in accordance with the technical requirements of FAA AD 2007-23-10 Amdt 39-15256. |
Compliance: | As specified in the Requirement document, with a revised effective date of |
| This Airworthiness Directive becomes effective on 17 January 2008. | |
Background: | This Directive requires a detailed inspection of electrical connectors installed in the main wheel well to ensure that fillet sealant is installed on the inboard and outboard sides of the receptacles at the disconnect brackets. Missing sealant around the receptacles could possibly result in corrosion damage, which could cause the loss of sufficient electrical bonding between the connectors and the disconnect bracket. The loss of electrical bonding could result in loss of the shielding that protects the wire bundles from Electromagnetic Interference (EMI) and High Intensity Radiated Field (HIRF). The loss of EMI and HIRF protection at those receptacles could possibly cause multiple electrical systems failure. Those failures could result in the loss of several critical control systems that are necessary for safe flight. In addition, a lightening strike could cause arcing in the fuel tank. |
David Villiers
Delegate of the Civil Aviation Safety Authority
27 November 2007
0
0
0