Commonwealth legislation

AD/JETSTREAM/22 - Ground Idle Increase

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This AD covers British Aerospace Jetstream 3100 aircraft (serials 601–763) and requires operators to carry out the actions in BAe Alert Service Bulletin 76‑A‑JM7620 — notably raising minimum ground idle to at least 72% to avoid propeller blade resonance. Part A has a firm compliance deadline; the regulator enforces the requirement and the implementation cost and burden fall on operators.

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Direct links to the current provisions in AD/JETSTREAM/22 - Ground Idle Increase.

AD/JETSTREAM/22 - Ground Idle Increase

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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British Aerospace BAe 3100 (Jetstream) Series Aeroplanes

AD/JETSTREAM/22 Ground Idle Increase 13/87 DM

Applicability: All Jetstream 3100 series aircraft S/N 601 to 763.

Requirement: Action in accordance with BAe Alert Service Bulletin 76-A-JM7620. Compliance: For Part A of requirement document:

Within 200 hours time in service or by 20 November 1987, whichever occurs first.

For Part B:

As advised in requirement document.

Background: The propeller manufacturer has discovered unexpected natural frequency variations during routine propeller blade inspection. Some of these frequencies are high enough to approach the engine resonant frequency at ground idle in adverse (tail wind) conditions with the resulting high stress introducing possible fatigue damage to the blades. Increasing ground idle to a minimum of 72% will avoid these resonant frequencies.

Source text

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

1 AD/JETSTREAM/22 - Ground Idle Increase