Commonwealth legislation

AD/SUPP/5 Amdt 1 - Air Equipment Hoists - "Up Limit" Micro Switches - Inspection and Modification

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This directive fixes a design flaw in Air Equipment helicopter hoists that lets water corrode the up‑limit switches and allow the cable to overwrap and break. It applies to affected Air Equipment hoists named in the directive.

Operators must inspect the 76370‑010 switch housing for moisture before first use after 5 July 1984 and every three months (replace if corroded), and complete a manufacturer’s permanent modification on all listed models before first use after 31 August 1985. This prevents catastrophic load drops.

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Current sections

Direct links to the current provisions in AD/SUPP/5 Amdt 1 - Air Equipment Hoists - "Up Limit" Micro Switches - Inspection and Modification.

AD/SUPP/5 Amdt 1 - Air Equipment Hoists - "Up Limit" Micro Switches - Inspection and Modification

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Supplementary Equipment

AD/SUPP/5

Amdt 1

Air Equipment Hoists - "Up Limit" Micro Switches - Inspection and Modification

3/85

Applicability: All Air Equipment hoists P/No. 76370, 76370-010, -011, -020 and -030 fitted to helicopters.

Requirement: 1. Model 76370-010 hoist : Gain access to "Up Limit" micro switches by removing cover from micro switch enclosure. Inspect micro switches and interior of enclosure for evidence of moisture ingress and/or corrosion. If either is detected replace micro switches before further use of the hoist

Model 76370, 76370-010, -011, -020 and -030 hoists: Modify the hoist according to the instructions contained in Air Equipment Service Information Letter No. 25.62.0E.

Compliance: For Para 1: Before further use of the hoist after 5 July 1984 and thereafter at periods not exceeding 3 months. The inspection requirements are terminated after the hoist has been modified.

For Para 2: Before further use of the hoist after 31 August 1985.

Background: A dual "up limit" micro switch failure attributed to water ingress has occurred. The hoist cable and hook assembly continued past the normal up limit position until cable failure occurred approximately 200mm from the hook.

This Directive is raised in issue to reflect the manufacturers maintenance requirements.

Source text

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

1 AD/SUPP/5 Amdt 1 - Air Equipment Hoists - "Up Limit" Micro Switches - Inspection and Modification