Commonwealth legislation

AD/S-76/22 - Main Rotor Control Servo Actuators - Inspection for Balance Tube Passage

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This Act has been repealed and is no longer in force. It is retained for historical reference.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 is a mandatory safety inspection order for all Sikorsky S-76 helicopters. It requires operators to check the main rotor control servo actuators (the hydraulic components that help pilots control the main rotor blades) for a missing oil passage called the "balance tube passage."

Why this matters: If this passage was accidentally left out during manufacturing, it restricts flight control movement. This could make the helicopter difficult or impossible to control, creating a serious crash risk.

What must be done:

Inspect the servo actuators following Sikorsky Alert Service Bulletin 76-67-14A
Complete the inspection within 30 hours of flight time after 28 April 1982
Important: Even if the helicopter was already inspected under the earlier bulletin (SB 76-67-14), it must be re-inspected under this updated directive

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AD/S-76/22 - Main Rotor Control Servo Actuators - Inspection for Balance Tube Passage

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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-76/22 Main Rotor Control Servo Actuators - Inspection

for Balance Tube Passage

6/82

Applicability: All models.

Document: Sikorsky Alert SB 76-67-14A. NOTE: Helicopters previously inspected to SB 76-67- 14 are to be re-inspected.

Compliance: Within 30 hours time in service after 28 April 1982.

Background: Restricted flight control motion was found to be due to the omission of a passage in the servo oil return system.

Source text

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