{"id":"F2010L02009","name":"AD/B747/399 - State of Design Airworthiness Directives - 2","slug":"ad-b747-399-state-of-design-airworthiness-directives-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":124503,"registerId":"commonwealth-F2010L02009-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 747 Series Aeroplanes","sectionType":"division","heading":"Boeing 747 Series Aeroplanes","content":"### Boeing 747 Series Aeroplanes\n\n| AD/B747/399 | State of Design Airworthiness Directives - 2 | 14/2009 |\n| ----------- | -------------------------------------------- | ------- |\n\n```html\n

Applicability:

Boeing 747 aircraft with General Electric CF6-45, -50 or Pratt & Whitney JT9D engines.

Requirement:

1. Determine the applicability of the FAA Airworthiness Directives (AD) listed in Table 1.

2. If it is determined that an FAA AD listed in Table 1 is applicable and has not been previously accomplished, perform the actions required by that AD or later FAA-approved revision.

Table 1

FAA AD

Effective Date

Title

2008-05-03

8 April 2008

Rear engine mount bulkhead

2006-09-01

26 May 2006

Thrust links of the rear engine mounts

2005-16-11

16 September 2005

Struts, spars and bolts

2005-06-09

25 April 2005

Side cowl assemblies

2005-05-20

17 April 2006

Flight-deck door electronic equipment

2005-05-07

15 April 2005

Aft and fwd surfaces of the bulkhead web

2005-01-03

9 February 2005

Midspar web of inboard and outboard struts

2004-07-19

11 May 2004

Cowl panel assembly of each engine

2003-16-14

22 September 2003

Forward lower spar

2003-16-06

12 September 2003

Fuel line

2002-23-15

11 December 2002

Lower lobe panel

2002-05-01

18 March 2002

Aft torque bulkhead of outboard nacelle struts

2001-26-12

11 February 2002

Outboard diagonal brace

FAA AD

Effective Date

Title

2001-15-15

4 September 2001

Rear engine mount

2001-11-11

16 July 2001

Seat track fittings on passenger seats

2000-21-06

24 November 2000

Precooler support fitting

99-04-01

16 March 1999

Outboard nacelle struts

97-20-01 R1

11 February 1999

Strut and wing

96-14-01

22 July 1996

Passenger oxygen supply lines

95-13-07

28 July 1995

Nacelle strut and wing structure

94-22-08

15 December 1994

Engine strut skin

92-04-05

26 March 1992

APU pneumatic duct restraint

91-13-11

22 July 1991

Wire bundles

Note: FAA ADs may be accessed via the internet at the following URL:

http://rgl.faa.gov

Compliance:

Before issue of a certificate of airworthiness.

This Airworthiness Directive becomes effective on 30 July 2010.

Background:

The FAA ADs listed in Table 1 of this Directive require once-only actions for which the compliance date and/or period has passed. Boeing 747 aircraft to which these FAA ADs apply may be registered in Australia in the future. This Directive is issued to ensure such aircraft comply with all State of Design ADs.

\n```\n\n![](image.001.png)\n\nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n14 July 2010","sortOrder":0},{"sectionNumber":"AD/B747/399","sectionType":"part","heading":"AD/B747/399","content":"## AD/B747/399","sortOrder":1},{"sectionNumber":"State of Design Airworthiness Directives","sectionType":"part","heading":"State of Design Airworthiness Directives - 2","content":"## State of Design Airworthiness Directives - 2","sortOrder":2},{"sectionNumber":"14/2009","sectionType":"part","heading":"14/2009","content":"## 14/2009","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This directive maintains its original scope as a 'catch-up' mechanism for State of Design ADs. It does not expand beyond its intended purpose of ensuring Boeing 747 aircraft imported or newly registered in Australia comply with historical FAA safety directives that may have been missed due to lapsed compliance periods."},"complexity_factors":["Incorporation by reference: The directive doesn't specify the actual technical requirements itself, but instead references 21 separate FAA Airworthiness Directives that must be looked up externally","Dual-condition applicability test: Operators must determine (a) whether an FAA AD applies AND (b) whether it has already been accomplished","Cross-border regulatory dependency: Compliance requires accessing and understanding US FAA regulations at a specific URL (http://rgl.faa.gov)","Multiple engine type variants: Applicability depends on specific engine models (CF6-45, CF6-50, or JT9D), requiring technical verification","Temporal complexity: The directive covers FAA ADs spanning 1991–2008 with various original effective dates, plus allows for 'later FAA-approved revisions'","Implicit ongoing obligation: The 'before issue of certificate of airworthiness' compliance date creates a continuous obligation for future registrations"],"plain_english_summary":"This AD requires owners/operators of Boeing 747s with GE CF6‑45/‑50 or P&W JT9D engines to review 21 specified FAA airworthiness directives and, if any apply and haven’t been done, carry out the required repairs, inspections or modifications. It affects operators and anyone registering such 747s in Australia and must be complied with before CASA issues a certificate of airworthiness. The directive took effect 30 July 2010."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive does not expand regulatory reach beyond ensuring that Boeing 747s with the specified engines comply with the FAA Airworthiness Directives listed in Table 1 when registered in Australia. It mechanically: (a) directs an applicability check of those FAA ADs, and (b) requires performance of applicable AD actions (or later FAA‑approved revisions) before issue of a certificate of airworthiness (Requirement 1–2; Compliance; Background)."},"complexity_factors":["Cross-reference to multiple FAA ADs (Table 1) — requires checking external documents for technical detail (Requirement; Table 1).","Technical applicability assessment — owner/operator must determine whether each FAA AD applies to a particular aircraft (Requirement 1).","Obligation to perform past-due, once-only actions — compliance dates for the listed FAA ADs have passed, creating retrospective repair/record burdens (Background).","Option to comply with a later FAA‑approved revision introduces versioning and evidentiary questions about acceptable compliance (Requirement 2).","Timing tied to certificate of airworthiness — administrative timing constraint may affect transfer/registration scheduling (Compliance).","Large list of discrete AD subjects (engine mounts, struts, fuel lines, wiring, etc.) increases the scope of inspections/works needed (Table 1).","Reliance on external FAA source for full AD texts — requires access to and interpretation of FAA material (Table 1 note)."],"plain_english_summary":"This Directive requires owners/operators of Boeing 747 aeroplanes with General Electric CF6‑45/‑50 or Pratt & Whitney JT9D engines to determine whether the FAA Airworthiness Directives listed in Table 1 apply and, if an FAA AD is applicable and not already done, to carry out the AD’s actions (or a later FAA‑approved revision) before a certificate of airworthiness is issued (Requirement 1–2; Compliance). Its stated purpose is to ensure future Australian-registered 747s meet State of Design ADs; the listed FAA ADs are once‑only actions with past compliance dates, so owners face retrospective technical and cost obligations (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-399-state-of-design-airworthiness-directives-2","history":"/api/acts/ad-b747-399-state-of-design-airworthiness-directives-2/history","analysis":"/api/acts/ad-b747-399-state-of-design-airworthiness-directives-2/analysis","conflicts":"/api/acts/ad-b747-399-state-of-design-airworthiness-directives-2/conflicts","importantCases":"/api/acts/ad-b747-399-state-of-design-airworthiness-directives-2/important-cases","documents":"/api/acts/ad-b747-399-state-of-design-airworthiness-directives-2/documents"}}