Commonwealth legislation

AD/MU-2/56 - Underspeed Governor Minimum Stop

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Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

Requires owners/operators of specified Mitsubishi MU-2B-26A, -36A, -40 and -60 aeroplanes (and MU-2B-36s modified under FAA STC SA2413SW) to carry out the corrective actions set out in FAA AD 94‑11‑04 and to add a minimum engine idle speed of 76.5% to the Aircraft Flight Manual. Compliance is required within 25 hours time in service from 29 June 1994. The directive responds to propeller‑hub fatigue risk from high vibration at ground idle.

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Current sections

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AD/MU-2/56 - Underspeed Governor Minimum Stop

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Mitsubishi MU-2 Series Aeroplanes

AD/MU-2/56 Underspeed Governor Minimum Stop 9/94 DM

Applicability: All MU-2B-26A, -36A, -40 and -60 aircraft and any MU-2B-36 aircraft previously modified in accordance with FAA Supplemental Type Certificate SA2413SW.

Requirement: 1. Action in accordance with the technical requirements of paragraphs (a) (b) (c) (d) & (e) of FAA AD 94-11-04 Amdt 39-8920.

Amend the Limitations Section of the Aircraft Flight Manual (AFM) to include the minimum engine idle speed of 76.5%.

Note: The applicable Green Page amendment to the AFM will be available from Civil Aviation Authority District Offices.

Compliance: Unless previously carried out within 25 hours time in service from 29 June 1994.

Note: CAO 107 AD/PHZL/64 mandates inspection of the propeller hub arms.

Background: During investigation following a fatal accident it was discovered that a reduction in the fatigue strength of the propeller hub could occur because of high vibration frequencies during ground idle speed.

Source text

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

1 AD/MU-2/56 - Underspeed Governor Minimum Stop