{"id":"F2007L04213","name":"AD/DH 82/15 - Mandatory Modifications","slug":"ad-dh-82-15-mandatory-modifications","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70406,"registerId":"commonwealth-F2007L04213-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"DH 82 (Tiger Moth) Series Aeroplanes","sectionType":"division","heading":"DH 82 (Tiger Moth) Series Aeroplanes","content":"### DH 82 (Tiger Moth) Series Aeroplanes\n\n| AD/DH 82/15 | Mandatory Modifications | 12/2007 |\n| ----------- | ----------------------- | ------- |\n\n| Applicability: | Model DH-82 and DH-82A aircraft of UK manufacture.                                                                                                                                                                                      |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Incorporate mandatory modifications in accordance with de Havilland Support Technical News Sheet (TNS) CT (MOTH) No. 5 Issue 1, or later UK CAA approved revisions.Note: UK CAA AD No.s 2731 PRE 80, 2732 PRE 80 and 2733 PRE 80 refer. |\n| Compliance:    | Unless already accomplished, within 25 hours time in service after issue of this Airworthiness Directive or before 31 March 2008, whichever occurs first.                                                                               |\n|                | This Airworthiness Directive becomes effective on 22 November 2007.                                                                                                                                                                     |\n| Background:    | It has been bought to CASA attention that the UK CAA still list the modifications of TNS CT (MOTH) No. 5 as mandatory.                                                                                                                  |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n12 October 2007","sortOrder":0},{"sectionNumber":"AD/DH 82/15","sectionType":"part","heading":"AD/DH 82/15","content":"## AD/DH 82/15","sortOrder":1},{"sectionNumber":"Mandatory Modifications","sectionType":"part","heading":"Mandatory Modifications","content":"## Mandatory Modifications","sortOrder":2},{"sectionNumber":"12/2007","sectionType":"part","heading":"12/2007","content":"## 12/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument adopts and enforces modifications already listed as mandatory by the UK CAA; it aligns CASA's requirements with the UK listing rather than expanding applicability. The directive imposes a mandatory retrofit and a firm compliance deadline but does not broaden the class of affected aircraft beyond the stated DH‑82/DH‑82A UK‑manufactured models (Background; Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow applicability: specific to DH‑82 and DH‑82A UK‑manufactured aircraft (Applicability).","External normative reference: mandates work per de Havilland TNS CT (MOTH) No. 5 or later UK CAA‑approved revisions (Requirement).","Short, fixed compliance window: 25 hours time‑in‑service or fixed calendar date creates scheduling pressure (Compliance).","Regulatory cross‑references: cites UK CAA ADs (2731 PRE 80, 2732 PRE 80, 2733 PRE 80) which may require checking additional documents (Requirement/Background).","Limited administrative discretion: effective date and deadline set by CASA Delegate (Effective date/Compliance)."],"plain_english_summary":"This directive requires owners/operators of UK-manufactured de Havilland DH‑82 and DH‑82A (Tiger Moth) aircraft to install the mandatory modifications set out in de Havilland Support Technical News Sheet CT (MOTH) No. 5 (or any later UK CAA‑approved revision). Work must be completed within 25 hours time‑in‑service after the AD issue or by 31 March 2008, whichever occurs first. The cost, scheduling and execution of the modifications fall to aircraft owners/operators; CASA enforces the requirement. (Applicability; Requirement; Compliance.)"},"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 Airworthiness Directive maintains its original narrow scope. It was issued specifically to align Australian requirements with existing UK CAA mandates for Tiger Moth aircraft safety modifications. The instrument has not expanded beyond its original purpose of mandating specific airframe modifications for this particular vintage aircraft type."},"complexity_factors":["Single, specific aircraft type (DH-82/DH-82A Tiger Moth) with narrow applicability","Only one substantive requirement: incorporate modifications per external technical document (TNS CT (MOTH) No. 5)","Simple compliance deadline structure (25 hours time-in-service or fixed date, whichever first)","No nested exceptions, conditional logic, or complex cross-referencing within the instrument itself","References to external documents (UK CAA ADs and de Havilland TNS) but does not reproduce their content","Very short instrument (approximately 150 words of substantive text excluding headers and repetition artifacts)"],"plain_english_summary":"This CASA Airworthiness Directive makes mandatory specific modifications to UK-built de Havilland DH‑82 and DH‑82A Tiger Moth biplanes (as specified in Technical News Sheet CT (MOTH) No. 5 Issue 1 or later-approved versions). It applies to all Australian operators/owners of those aircraft and aligns Australian requirements with the UK CAA; compliance was safety‑critical and required within the stated short compliance window, otherwise the aircraft could not lawfully fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-82-15-mandatory-modifications","history":"/api/acts/ad-dh-82-15-mandatory-modifications/history","analysis":"/api/acts/ad-dh-82-15-mandatory-modifications/analysis","conflicts":"/api/acts/ad-dh-82-15-mandatory-modifications/conflicts","importantCases":"/api/acts/ad-dh-82-15-mandatory-modifications/important-cases","documents":"/api/acts/ad-dh-82-15-mandatory-modifications/documents"}}