Document ID: chunk:federal_register_of_legislation:F2006B02923:body:0:p2
Version: federal_register_of_legislation:F2006B02923
Segment Type: other
Provision Reference: 
Character Range: 2809–4308

Compliance: For Requirement 1 - Within 60 months after the effective date of this Directive.

 Boeing 737 Series Aeroplanes

 AD/B737/227 (continued)

            For Requirement 2 - Before further flight after the Requirement 1 bonding resistance check.

            For Requirement 3 - Before further flight after completing Requirements 1 and 2. For Requirement 4 - Before further flight after completing Requirement 3.
            For Requirement 5 - Before further flight after completing Requirement 4. This Airworthiness Directive becomes effective on 5 August 2004.
            Background: This Directive requires, among other things, preparation of the electrical bonding faying surfaces for the tubing penetrations of the hydraulic heat exchanger on the forward and aft surfaces of the rear spars of the fuel tanks of the left and right wings, a one-time measurement of the electrical bonding resistances together with follow-on actions.

            These actions are necessary to ensure adequate electrical bonding between the penetration fittings of the hydraulic heat exchanger and the rear spars of the fuel tanks. Inadequate electrical bonding, in the event of a lightning strike, could cause electrical arcing and ignition of fuel vapour in the wing fuel tank, which could result in a fuel tank explosion.

 James Coyne
 Delegate of the Civil Aviation Safety Authority 23 June 2004

 The above AD is notified in the Commonwealth of Australia Gazette on 14 July 2004.