Commonwealth legislation

AD/SD3-30/29 - Main Landing Gear - Beam Sub Assembly

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This Airworthiness Directive requires operators of Short SD3‑30 aeroplanes fitted with specified Menasco main‑landing‑gear beam assemblies to rework certain beam sub‑assemblies (per Shorts Service Bulletin SD3‑32‑90 Rev 2) and to remove particular older beam part numbers from service. Compliance is measured by component landing counts and includes staged deadlines.

Fatigue testing identified a stress raiser at the bore–axle intersection; the rework increases the radius. Operators pay for rework or replacement, face downtime and scheduling costs, and must track landing counts to comply.

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AD/SD3-30/29 - Main Landing Gear - Beam Sub Assembly

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Short SD3-30 Series Aeroplanes

AD/SD3-30/29 Main Landing Gear - Beam Sub Assembly 5/95

Applicability: All Model SD3-30 series aeroplanes equipped with Menasco MLG beam assembly P/N 17501 serial numbers MMC-005 to MMC-068 and MMC-071 to MMC-188 inclusive.

Requirement: 1. Rework the MLG beam sub-assembly P/N 17604-9, -13, -13A/14A, -15/16 or

-17/18 in accordance with Shorts Service Bulletin SD3-32-90, Revision 2.

Remove from service MLG beam sub-assembly P/N 17604-9, -13 or -13A/14A.

Note: FAA AD 93-14-03 refers.

Compliance: 1. Rework in accordance with Requirement 1 before 13 500 total component landings or before 2 300 component landings from 27 April 1995, whichever occurs later.

Action in accordance with Requirement 2 before 20 000 total component landings.

Background: Fatigue testing has revealed that there is a stress raiser at the lower edge of the bore where the beam ID intersects with the axle hole. The rework increases the radius of the intersection. Other locations of high stress are also radiused.

Source text

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

1 AD/SD3-30/29 - Main Landing Gear - Beam Sub Assembly