Commonwealth legislation

AD/S-76/38 - Main Rotor Gear Box No. 1 and No. 2 Input Bevel Pinion Housing Assemblies - Inspection

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

3/10 complexity

Safety check for helicopter gearboxes. This directive requires owners of Sikorsky S-76 helicopters to inspect specific parts of the main rotor gearbox—namely the input bevel pinion housing assemblies—before the aircraft is first certified or before installing certain gearboxes.

The problem: During routine overhaul, the manufacturer found that retaining nuts on these assemblies could lose their proper torque (come loose). This is serious because these nuts hold critical gearbox components together; if they fail, the gearbox could fail, potentially causing the helicopter to crash.

What must be done: Operators must follow the inspection procedures in Sikorsky Service Bulletin No. 76-66-19. This ensures the nuts are properly tightened and secured before the helicopter flies.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/S-76/38 - Main Rotor Gear Box No. 1 and No. 2 Input Bevel Pinion Housing Assemblies - Inspection.

AD/S-76/38 - Main Rotor Gear Box No. 1 and No. 2 Input Bevel Pinion Housing Assemblies - Inspection

meta-content-style-type: text/css meta-content-type: application/xhtml+xml; charset=utf-8 meta-generator: Aspose.Words for .NET 22.10.0

?xml version="1.0" encoding="utf-8" standalone="no"?>

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Sikorsky S-76 Series Helicopters

AD/S-76/38 Main Rotor Gear Box No. 1 and No. 2 Input Bevel

Pinion Housing Assemblies - Inspection

Applicability: As per the Requirement Document. Requirement: Sikorsky S.B. No. 76-66-19.

Compliance: 1. Prior to the issue of an initial Certificate of Airworthiness; or

6/85

Prior to the installation of a MRGB called up in the Requirement Document.

Background: During the overhaul of a gearbox, the manufacturer found a torque loss on the input bevel pinion housing assembly retaining nuts.

Source text

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