Commonwealth legislation

AD/B747/129 - Fuselage Lower Frames at Body Stations 2200 and 2220

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

Requires operators of Boeing 747 aircraft (Line Nos. 1–757, non‑SP) to carry out detailed visual inspections of lower fuselage frames at body stations 2200 and 2220 for cracks, using Boeing Service Bulletin 747‑53‑2302. (Applicability; Requirement)

The AD sets timing: an initial inspection tied to flight-count thresholds or frame replacement, mandatory repeats every 2,000 flights, and expanded inspection if cracks are found. Operators pay for inspections and repairs; non‑compliance risks regulatory enforcement. (Compliance paras 1–4)

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/B747/129 - Fuselage Lower Frames at Body Stations 2200 and 2220.

AD/B747/129 - Fuselage Lower Frames at Body Stations 2200 and 2220

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
Boeing 747 Series Aeroplanes

AD/B747/129 Fuselage Lower Frames at Body Stations 2200 and 2220

9/94

Applicability: Boeing Model 747 aircraft, Line Numbers 1 to 757 inclusive, SP versions excepted.

Requirement: Conduct a detailed visual inspection of the fuselage lower frames at body stations 2200 and 2220 for cracks in accordance with Boeing Service Bulletin 747-53-2302.

Note: FAA AD 91-18-04 refers.

Compliance: 1. For aircraft with less than 10000 flights as at 18 August 1994, inspect before 10000 flights or within 1000 flights, whichever occurs later.

2. For aircraft which have had the frames replaced in accordance with Boeing Service Bulletin 747-53-2302, inspect within 10000 flights from the date of frame replacement.

3. In all cases, repeat the inspection at intervals not exceeding 2000 flights.

4. If cracks are found as a result of para 1, 2, or 3 inspections, extend the inspection area to include the adjacent frames (BS 2180 and 2240), stringers, skin, skin lap joints and skin adjacent to the outflow valve.

Background: This Directive specifies regular visual inspections for cracks in the fuselage frames. If not detected, such cracks could lead to frame failure and sudden decompression of the fuselage.

Source text

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

1 AD/B747/129 - Fuselage Lower Frames at Body Stations 2200 and 2220