{"id":"F2008L01252","name":"AD/B767/238 - Airconditioning Mix Manifold Ducting","slug":"ad-b767-238-airconditioning-mix-manifold-ducting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73490,"registerId":"commonwealth-F2008L01252-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"division","heading":"Boeing 767 Series Aeroplanes","content":"### Boeing 767 Series Aeroplanes\n\n| AD/B767/238 | Airconditioning Mix Manifold Ducting | 5/2008 |\n| ----------- | ------------------------------------ | ------ |\n\n```html\n

Applicability:

Boeing Model 767-300F series aeroplanes, as identified in Boeing Special Attention Service Bulletin 767-21-0192, dated 23 March 2006.

Requirement:

Do the applicable action specified in Table 1 of this AD in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin
767-21-0192.

Table 1. - Replacement

For aeroplanes identified in the service bulletin as -

Do the following action -

(1) Group 1 aeroplanes

Replace the rotomolded duct between the transition duct of the right cooling pack and the mix manifold with a new duct made of aluminium.

(2) Group 2 aeroplanes

Replace the rotomolded ducts of the mix manifold system with new ducts made from Kevlar® and aluminium.

Note: FAA AD 2007-25-13 Amendment 39-15295 dated 23 November 2007 refers.

Compliance:

Within 36 months after the effective date of this AD.

This Airworthiness Directive becomes effective on 8 May 2008.

Background:

This AD results from a report of failures of the duct joint seal of the mix manifold system. The issuing of this AD is intended to prevent air conditioning leakage into the mix manifold bay. Such leakage could decrease the air flow to the flight compartment and main cabin or could allow smoke into the flight compartment in the event of a fire in the main cabin or forward cargo compartment.

\n```\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n6 March 2008","sortOrder":0},{"sectionNumber":"AD/B767/238","sectionType":"part","heading":"AD/B767/238","content":"## AD/B767/238","sortOrder":1},{"sectionNumber":"Airconditioning Mix Manifold Ducting","sectionType":"part","heading":"Airconditioning Mix Manifold Ducting","content":"## Airconditioning Mix Manifold Ducting","sortOrder":2},{"sectionNumber":"5/2008","sectionType":"part","heading":"5/2008","content":"## 5/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements the corrective action described in its background and applies only to the 767-300F aeroplanes identified in the referenced Boeing service bulletin; it does not broaden applicability or add requirements beyond the replacement and 36‑month compliance period stated in the instrument."},"complexity_factors":["Limited applicability to Boeing Model 767-300F aircraft identified in a specific Boeing Special Attention Service Bulletin (Applicability).","Technical specification of replacement materials (aluminium for Group 1; Kevlar® plus aluminium for Group 2) requires particular parts and installation methods (Requirement; Table 1).","Reliance on Boeing’s Accomplishment Instructions for the approved method of compliance increases dependence on the manufacturer’s procedures (Requirement).","Single compliance deadline of 36 months creates a fixed scheduling and logistics constraint for operators (Compliance).","Safety rationale is narrowly targeted at preventing air‑conditioning leakage and possible smoke ingress, tying the mandated action to a specific failure mode (Background).","Cross-reference to FAA AD 2007-25-13 means coordination with existing foreign regulator guidance (Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of Boeing 767-300F freighter aeroplanes (as listed in Boeing Special Attention Service Bulletin 767-21-0192) to replace specified rotomoulded mix-manifold ducting with new aluminium or Kevlar/aluminium ducts to address joint-seal failures. (Applicability; Requirement.)\n\nOperators must complete the replacements within 36 months and follow Boeing’s Accomplishment Instructions; costs and installation responsibility sit with the aircraft operators. The AD was issued to prevent air‑conditioning leakage that could reduce airflow or allow smoke into the flight compartment. (Compliance; Background.)"},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific airworthiness issue (duct seal failures) on a specific aircraft type (Boeing 767-300F). There is no evidence of scope creep; it remains a targeted safety directive for a defined fleet subset."},"complexity_factors":["Single, specific technical requirement with only two conditional branches (Group 1 vs Group 2 aircraft)","Minimal cross-referencing — only refers to one Boeing Service Bulletin and one FAA AD for background","No defined terms section or interpretation provisions","Straightforward compliance deadline (36 months from effective date)","Short document length with clear tabular presentation of requirements","Single applicability criterion (specific aircraft model series identified by service bulletin)"],"plain_english_summary":"This AD mandates replacement of rotomolded air‑conditioning ducting on specified Boeing 767-300F freighters (per Boeing Service Bulletin) because failing joint seals can leak AC into wrong compartments. It affects operators of the identified aircraft; some require different replacement parts depending on configuration.\n\nThe replacements prevent reduced cockpit/cabin airflow and smoke infiltration into the flight deck. Compliance: within 36 months of the 8 May 2008 effective date."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-238-airconditioning-mix-manifold-ducting","history":"/api/acts/ad-b767-238-airconditioning-mix-manifold-ducting/history","analysis":"/api/acts/ad-b767-238-airconditioning-mix-manifold-ducting/analysis","conflicts":"/api/acts/ad-b767-238-airconditioning-mix-manifold-ducting/conflicts","importantCases":"/api/acts/ad-b767-238-airconditioning-mix-manifold-ducting/important-cases","documents":"/api/acts/ad-b767-238-airconditioning-mix-manifold-ducting/documents"}}