Commonwealth legislation

AD/B727/190 - Electrical Bonding

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legislative instrument

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This Airworthiness Directive requires operators of Boeing 727‑100 and ‑200 aeroplanes listed in Boeing Alert Service Bulletin 727‑29A0067 to prepare and test electrical bonding at the hydraulic heat‑exchanger tube penetrations in the wing rear spars, bring bonding resistance below the ASB threshold, apply sealant/finishes, pressurize and inspect hydraulic and fuel systems, and repair any leaks. It affects aircraft operators and maintenance organisations, imposing inspection, rework and testing costs and aircraft downtime to correct a specified unsafe bonding condition (Requirements 1–5).

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AIRWORTHINESS DIRECTIVE

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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 39.1 (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.

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Boeing 727 Series Aeroplanes

AD/B727/190 Electrical Bonding 8/2004

Applicability: Model 727-100 and -200 series aeroplanes as listed in Boeing Alert Service Bulletin (ASB) 727-29A0067 dated 7 June 2001.

Requirement: 1. Prepare 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, together with carrying out a one-time measurement of the electrical bonding resistances between the penetration fittings of the hydraulic heat exchanger and the rear spars; and between the heat exchanger tube and the lower wing stringer surfaces, per the Accomplishment Instructions of ASB 727-29A0067.

2. If the bonding resistance is incorrect, repeat the preparation of the electrical bonding faying surface for the tubing penetrations of the hydraulic heat exchanger on the forward and aft surfaces of the rear spar of the fuel tanks of the left and right wings as necessary to achieve a bonding resistance below the threshold specified in the Accomplishment Instructions of ASB 727-29A0067.

3. Apply fillet sealant and protective finishes around the penetration fittings of the hydraulic heat exchanger in accordance with the Accomplishment Instructions of ASB 727-29A0067 (Figure 4 refers).

4. Service and pressurize the hydraulic systems and examine for signs of hydraulic fluid leakage. Service the fuel tank and examine for signs of fuel leakage. All these actions are to be accomplished in accordance with ASB 727-29A0067.

5. Repair any leaks found, during the Requirement 4 examination, in accordance with ASB 727-29A0067.

Note: FAA AD 2004-10-06 Amdt 39-13636 refers.

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

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.

Source text

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

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

Boeing 727 Series Aeroplanes