Commonwealth legislation

AD/AIRCON/3 - Godfrey Cabin Supercharger Type 15 - Rotor Balance - 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This Act has been repealed and is no longer in force. It is retained for historical reference.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

2/10 complexity

This is a safety rule for aircraft maintenance that applies to a specific piece of equipment: the Godfrey Cabin Supercharger Type 15 (an air conditioning compressor used in some aircraft).

What it requires: Mechanics must dynamically balance the rotating parts (rotors) inside these superchargers. This means ensuring the spinning components are weighted evenly so they don't vibrate dangerously. The balance must be precise — within 0.020 ounces — and done using the method described in the manufacturer's approved overhaul manual.

When it applies:

New rotors: Before installing a brand-new rotor in an aircraft for the first time
Used rotors: Before reinstalling a rotor that has been overhauled, but only if the overhaul was completed after January 30, 1968

Why it matters: Unbalanced rotating parts can cause severe vibrations that damage the aircraft or cause equipment failure mid-flight. This rule prevents mechanical failures by ensuring these components spin smoothly.

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Current sections

Direct links to the current provisions in AD/AIRCON/3 - Godfrey Cabin Supercharger Type 15 - Rotor Balance - Inspection.

AD/AIRCON/3 - Godfrey Cabin Supercharger Type 15 - Rotor Balance - Inspection

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Airconditioning Equipment

AD/AIRCON/3 Godfrey Cabin Supercharger Type 15 - Rotor NK

Balance - Inspection

Applicability: All Godfrey Cabin Superchargers Type 15.

Requirement: Dynamically balance the rotors to within 0.020oz. in accordance with the technique specified in the approved overhaul manual.

Compliance: New Rotors: Before initial installation in an aircraft. Used Rotors: Before installation in an aircraft following each overhaul completed after 30 January 1968.

Source text

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