{"id":"F2006B03381","name":"AD/B767/24 Amdt 1 - Door Counter Balance Torsion Spring","slug":"ad-b767-24-amdt-1-door-counter-balance-torsion-spring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42883,"registerId":"commonwealth-F2006B03381-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B767/24 Amdt 1 - Door Counter Balance Torsion Spring","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 767 Series Aeroplanes\n\nAD/B767/24\n\nAmdt 1\n\n  \nDoor Counter Balance Torsion Spring 5/93\n\nApplicability: Model 767 series aircraft with entry or service doors equipped with slide rafts; line positions 002 through 409.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 93-01-19 Amdt 39- 8473.\n\nNote: Boeing ASB 767-52A0053 Revision 2 refers.\n\nCompliance: As specified in the Requirement Document with a revised effective date of 29 April 1993.\n\nBackground: A broken counterbalance torsion spring condition would require extra effort to unlatch the door, and manual assistance to open the door in an emergency. A broken spring could jam the counterbalance assembly and prevent opening of the door during an emergency evacuation. Amendment 1 is issued in response to a new FAA AD which provides for an optional installation which, when accomplished, constitutes terminating action for the currently required repetitive operational checks.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment stays within the original scope of addressing door counterbalance spring safety. The change is procedural — offering an optional terminating action rather than expanding to new aircraft systems or new safety issues. The original intent was to prevent door jamming during emergencies; Amendment 1 simply provides an alternative compliance method (one-time installation vs. repetitive checks)."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined structural elements (Applicability, Requirement, Compliance, Background)","Single cross-reference to FAA AD 93-01-19 and Boeing ASB 767-52A0053","No nested conditional logic or exceptions — straightforward mandate with one optional terminating action","Technical content assumes aviation engineering knowledge but legislative structure is simple"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 767 aircraft.\n\n**What it does:**\n- Requires owners and operators of certain Boeing 767 planes to follow specific safety instructions originally issued by the US Federal Aviation Administration (FAA AD 93-01-19).\n- The issue involves **door counterbalance torsion springs** — mechanical parts that help aircraft doors open smoothly. If these springs break, doors become hard or impossible to open during an emergency evacuation, which could trap passengers inside.\n\n**Who it affects:**\n- Operators of Boeing 767 aircraft with specific door configurations (models with entry or service doors equipped with slide rafts, specifically line positions 002 through 409).\n\n**What's new in this amendment:**\n- **Amendment 1** adds an option: operators can now install a modified component that permanently fixes the problem, rather than having to repeatedly check the springs over and over again (the original requirement).\n\n**Why it matters:**\n- This is about **emergency evacuation safety**. A broken spring could mean the difference between passengers escaping quickly or being trapped in a burning or damaged aircraft. The amendment makes compliance easier by offering a one-time fix instead of ongoing repetitive inspections."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 modifies the original AD by incorporating a new FAA AD that provides an optional retrofit which, when installed, terminates the requirement for the previously mandated repetitive operational checks. It also sets a revised compliance effective date of 29 April 1993 and refers to Boeing ASB 767‑52A0053 Revision 2 for technical details."},"complexity_factors":["Cross-reference to an external FAA AD (93‑01‑19) — requires operators to follow another regulator's technical document rather than standalone Australian text.","Limited applicability by aircraft model and line positions (002–409) — narrows who must comply but requires accurate fleet identification.","Operative choice between repetitive operational checks and an optional terminating installation — introduces a compliance decision for operators (inspection burden vs installation cost).","Safety-critical mechanical failure mode (counterbalance torsion spring) — increases operational risk and consequence, requiring timely action.","Reference to Boeing service bulletin (ASB 767‑52A0053 Rev 2) — reliance on manufacturer documentation for technical details.","Revised compliance effective date (29 April 1993) — scheduling and record-keeping implications for operators and maintainers."],"plain_english_summary":"Requires operators of Boeing 767 aeroplanes (line positions 002–409) with entry or service doors that have slide rafts to carry out the technical actions set out in FAA AD 93‑01‑19. The amendment (effective 29 April 1993) notes an optional retrofit that, if installed, stops the need for repeated operational checks for a possibly broken door counterbalance torsion spring. Operators therefore must choose between ongoing inspections or a one‑time modification, shifting compliance costs and procedures accordingly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-24-amdt-1-door-counter-balance-torsion-spring","history":"/api/acts/ad-b767-24-amdt-1-door-counter-balance-torsion-spring/history","analysis":"/api/acts/ad-b767-24-amdt-1-door-counter-balance-torsion-spring/analysis","conflicts":"/api/acts/ad-b767-24-amdt-1-door-counter-balance-torsion-spring/conflicts","importantCases":"/api/acts/ad-b767-24-amdt-1-door-counter-balance-torsion-spring/important-cases","documents":"/api/acts/ad-b767-24-amdt-1-door-counter-balance-torsion-spring/documents"}}