{"id":"F2006B09040","name":"AD/DHC-2/22 Amdt 1 - Aileron Centre Hinge Bracket","slug":"ad-dhc-2-22-amdt-1-aileron-centre-hinge-bracket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52747,"registerId":"commonwealth-F2006B09040-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-2/22 Amdt 1 - Aileron Centre Hinge Bracket","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  DHC-2 (Beaver) Series Aeroplanes\n\n \n\nAD/DHC-2/22\n\nAmdt 1\n\n\nAileron Centre Hinge Bracket 1/88 DM\n\n \n\nApplicability: All models DHC-2 Mk1 and MkII and DHC-2 MkIII. Turbo- Beaver Aircraft not incorporating Modification 2/1536.\n\n \n\nRequirement: Modify in accordance with De-Havilland Canada S.B 2/37 Rev C.\n\n \n\nNote: Canadian AD CF-84-02-R1 refers.\n\n \n\nCompliance: Unless already accomplished within 200 hours time in service after 19 November 1987 or prior to 19 January 1988 whichever is earlier.\n\n \n\nBackground:  The initial issue of this Directive allowed an open ended continued inspection. However, due to failure of a cast bracket in flight this option is now terminated.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This is Amendment 1 to the original AD. The scope changed from allowing 'open ended continued inspection' (ongoing checks without mandatory replacement) to requiring mandatory physical modification after an in-flight failure of the bracket occurred. The original flexibility was terminated, making the directive more prescriptive and urgent."},"complexity_factors":["Very short document (under 200 words)","Only 4 operative provisions: applicability, requirement, note, and compliance","Single cross-reference to Canadian AD CF-84-02-R1 and manufacturer Service Bulletin 2/37 Rev C","Simple conditional applicability (exclusion for aircraft with Modification 2/1536)","No defined terms section — uses standard aviation terminology","Linear structure with no nested exceptions or sub-paragraphs"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific repairs or modifications to aircraft.\n\n**What it does:** It orders owners and operators of certain **de Havilland Canada DHC-2 \"Beaver\" aircraft** to modify the **aileron centre hinge bracket** — a metal part that connects the aileron (the moving flap on the wing that controls rolling) to the wing structure.\n\n**Who it affects:**\n- All DHC-2 Mk1, MkII, and MkIII models\n- **Excludes:** \"Turbo-Beaver\" aircraft that already have Modification 2/1536 installed\n\n**Why it matters:** A cast bracket **failed in flight**, creating a serious safety risk. The original version of this directive allowed ongoing inspections instead of replacement, but after the in-flight failure, that option was cancelled. Now the modification **must** be done.\n\n**What must be done:** Install the fix described in **De Havilland Canada Service Bulletin 2/37 Revision C** (the manufacturer's official repair instructions).\n\n**When it had to be done:** Within 200 flight hours after 19 November 1987, or before 19 January 1988 — whichever came first. (This AD is now historical — the deadline has long passed.)"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment changed the compliance approach from permitting an ongoing inspection regime to requiring a mandatory modification. The original AD allowed continued inspections as an alternative; this amendment terminates that option following an in‑flight failure and imposes retrofit in accordance with De‑Havilland Canada S.B. 2/37 Rev C within the specified timeframe. (Background; Requirement; Compliance)"},"complexity_factors":["Technical requirement to perform a specific modification per De‑Havilland Canada S.B. 2/37 Rev C (technical maintenance task). (Requirement)","Short, non‑standard compliance window defined by hours‑in‑service and a calendar cutoff (200 hours after 19 Nov 1987 or before 19 Jan 1988, whichever is earlier). (Compliance)","Applicability carve‑out for aircraft incorporating Modification 2/1536, creating conditional application. (Applicability)","Removal of a prior inspection‑only option and replacement with a mandatory modification (change in regulatory approach). (Background)","Reference to an external foreign AD (Canadian CF‑84‑02‑R1) and an external service bulletin, requiring cross‑document interpretation. (Note; Requirement)"],"plain_english_summary":"This directive mandates a one‑time physical modification to the aileron centre hinge bracket on most de Havilland DHC‑2 Beaver aircraft, to be done exactly per De‑Havilland Canada Service Bulletin 2/37 Rev C. It affects owners/operators (who must pay and schedule the work) and replaces a prior inspection‑only option after an in‑flight bracket failure, creating immediate maintenance cost and a short compliance window that concentrates demand for parts and labor."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-2-22-amdt-1-aileron-centre-hinge-bracket","history":"/api/acts/ad-dhc-2-22-amdt-1-aileron-centre-hinge-bracket/history","analysis":"/api/acts/ad-dhc-2-22-amdt-1-aileron-centre-hinge-bracket/analysis","conflicts":"/api/acts/ad-dhc-2-22-amdt-1-aileron-centre-hinge-bracket/conflicts","importantCases":"/api/acts/ad-dhc-2-22-amdt-1-aileron-centre-hinge-bracket/important-cases","documents":"/api/acts/ad-dhc-2-22-amdt-1-aileron-centre-hinge-bracket/documents"}}