Commonwealth legislation

AD/B767/92 - Main Battery Shunt and Ground Stud

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

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This Airworthiness Directive requires operators of Boeing 767 aeroplanes listed in Boeing Alert Service Bulletin 767‑24A0112 Revision 1 to inspect the main battery shunt and the main battery ground stud and to fix any defects using the ASB procedures. It is intended to prevent loss of the hot battery bus caused by loose, cracked, corroded or improperly torqued fasteners. Operators must complete inspections by the stated deadline and repair any faults before further flight.

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AD/B767/92 - Main Battery Shunt and Ground Stud

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Boeing 767 Series Aeroplanes

AD/B767/92 Main Battery Shunt and Ground Stud 12/96

Applicability: This Directive is applicable to Model 767 series aeroplanes listed in Boeing Alert Service Bulletin (ASB) 767-24A0112 Revision 1 dated 8 August 1996.

Requirement: 1. Perform an inspection of the main battery shunt in accordance with ASB 767- 24A0112 Revision 1.

2. Perform an inspection of the of the main battery ground stud in accordance with ASB 767-24A0112 Revision 1.

3. Rectify any discrepancies detected during the Requirement 1 and 2 inspections in accordance with the procedures in the ASB.

Note: FAA AD 96-19-10 Amdt 39-9757 refers.

Compliance: For Requirements 1 and 2 - Unless previously accomplished, prior to 16 November 1996.

For Requirement 3 - Before further flight.

This Airworthiness Directive becomes effective on 9 October 1996.

Background: The FAA has received reports indicating that interruptions of electrical power have occurred during flight, which resulted in the loss of battery power to the hot battery bus (HBB) on a Boeing 767 aeroplane. The HBB is the source of standby power for the aircraft and its loss could affect several aircraft systems during standby operations.

Investigations have revealed that power interruptions may have been caused by improper assembly of fasteners on the studs, cracked shunts, corroded or contaminated fasteners or improper torque of the fasteners. Loose fasteners on the shunt studs can create an open circuit or high resistance in the main battery ground stud connection which can cause an interruption to the battery charger and loss of the HBB.

Actions specified by this Directive are designed to rectify this unsafe condition.

Source text

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

1 AD/B767/92 - Main Battery Shunt and Ground Stud