Commonwealth legislation

AD/M20/51 - Main Landing Gear Side Brace Bolt

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Requires owners/operators of listed Mooney M20 aeroplanes to inspect and grind the main landing gear leg bracket (P/N 510010) and replace any cracked brackets per Mooney Service Bulletin M20‑265. Compliance is within 100 hours time‑in‑service after 28 January 1999; replacement must be done before further flight.

Purpose stated: to prevent MLG side brace bolt failure and landing gear collapse caused by cracks from laser‑pattern cutting. Aircraft owners/operators pay for inspections, repairs and replacements and must follow the service bulletin and maintenance manual.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/M20/51 - Main Landing Gear Side Brace Bolt.

AD/M20/51 - Main Landing Gear Side Brace Bolt

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Mooney M20 Series Aeroplanes

AD/M20/51 Main Landing Gear Side Brace Bolt 1/99

Applicability: The following models and serial numbers: Models Serial Numbers

M20J 24-3415 and 24-3416

M20K 25-2018 through 25-2021

M20M 27-0241

M20R 29-0135 through 29-0138

Requirement: Accomplish the following in accordance with the Instructions section of Mooney Service Bulletin M20-265:

Grind the surface of the main landing gear (MLG) leg bracket, part number (P/N) 510010. Inspect the affected area of the P/N 510010 MLG leg bracket for cracks.

2. Replace any cracked P/N 510010 bracket found as a result of the Requirement 1 inspection with a new P/N 510010 MLG leg bracket. Accomplish this replacement in accordance with the applicable maintenance manual.

Note: FAA AD 98-21-26 Amdt 39-10834 refers.

Compliance: 1. With 100 hours time in service after 28 January 1999.

Before further flight.

This Airworthiness Directive becomes effective on 28 January 1999.

Background: The manufacturing of MLG leg brackets, using laser pattern cutting, prompted the actions required by this directive. The brackets, when manufactured using this process, develop minor cracks at the bends which could propagate over time. The actions required by this directive are intended to prevent failure of the MLG side brace bolt caused by cracking of the MLG leg bracket, and consequent collapse of the landing gear.

Source text

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

1 AD/M20/51 - Main Landing Gear Side Brace Bolt