{"id":"F2006B06867","name":"AD/SD3-60/23 Amdt 2 - Rudder Gust Lock","slug":"ad-sd3-60-23-amdt-2-rudder-gust-lock","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114747,"registerId":"commonwealth-F2006B06867-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/23 Amdt 2 - Rudder Gust Lock","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) \nShort SD3-60 Series Aeroplanes\n\nAD/SD3-60/23\n\nAmdt 2\n\n \nRudder Gust Lock 8/88\n\n```html\n

Applicability:

For SB SD360-27-16:

All models S/Nos SH3601 to SH3715 as applicable, and

For SB SD360-27-21:

All models.

Requirement: Action in accordance with:

Part 1:

Shorts SB SD360-27-16 and

Part 2:

Shorts SB SD360-27-21.

Compliance:

Part 1:

Prior to 31 January 1988.

Part 2:

Prior to 30 September 1988.

\n```\n\nBackground: Damage has occurred to the rudder control system due to wind gust and jet blast.\n\nThis prompted the issue of the original Requirement, ie Part 1. Since then there have been reports of unsolicited engagement of the rudder gust lock. Investigation indicates that these were caused by inaccurate adjustment of microswitch WM2.","sortOrder":0}],"analysis":{"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":3,"scope_assessment":{"changed":true,"description":"The original directive (Part 1) was narrowly targeted at specific serial numbers (SH3601-SH3715) to address wind/jet blast damage. Amendment 2 expanded the scope significantly to cover ALL models for Part 2, adding a second distinct safety issue (unsolicited engagement due to microswitch adjustment). The directive evolved from a single-issue, limited-fleet fix to a two-part, fleet-wide safety mandate addressing both ground damage and in-flight control hazards."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 defined compliance pathways (Part 1 and Part 2)","Simple conditional structure based on aircraft serial numbers","No nested exceptions or cross-references to other legislation","Relies on external technical documents (Service Bulletins) for actual implementation details — the directive itself just mandates compliance with those documents","Clear, fixed deadlines with no alternative compliance methods"],"plain_english_summary":"CASA requires operators of Short SD3‑60 aeroplanes to modify the rudder gust‑lock system to stop wind/jet‑blast damage and to prevent inadvertent in‑flight engagement caused by a misadjusted microswitch. Aircraft SH3601–SH3715 must comply via Service Bulletin SD360‑27‑16 by 31 Jan 1988; all SD3‑60s must follow SB SD360‑27‑21 by 30 Sep 1988. The work is mandatory to restore safe rudder control and legal airworthiness."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment expands the directive beyond the original Part 1 remedy. Part 2 (SB SD360‑27‑21) was added and made applicable to all models to address unsolicited engagement of the rudder gust lock caused by inaccurate adjustment of microswitch WM2. The change broadens affected aircraft and adds an additional compliance requirement and deadline."},"complexity_factors":["Two separate manufacturer's service bulletins are mandated (different parts of the AD).","Split applicability: one bulletin applies to specific serial numbers (SH3601–SH3715), the other to all models.","Staggered compliance deadlines (Part 1 by 31 Jan 1988; Part 2 by 30 Sep 1988).","Technical remedy includes adjustment of a microswitch (WM2), requiring skilled maintenance and calibration.","Safety‑critical flight‑control system involvement increases regulatory and operational oversight.","Dependence on manufacturer SB instructions rather than detailed AD text increases reliance on external documents."],"plain_english_summary":"This Airworthiness Directive requires operators of Short SD3-60 aeroplanes to carry out the maintenance actions set out in two manufacturer's service bulletins to prevent damage to, and unintended engagement of, the rudder gust‑lock. It applies to specified serial numbers for one bulletin and to all models for the other, with staggered compliance deadlines in 1988. Aircraft owners/operators pay for the work and must instruct maintenance providers to adjust or modify the gust‑lock system (including microswitch WM2)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-23-amdt-2-rudder-gust-lock","history":"/api/acts/ad-sd3-60-23-amdt-2-rudder-gust-lock/history","analysis":"/api/acts/ad-sd3-60-23-amdt-2-rudder-gust-lock/analysis","conflicts":"/api/acts/ad-sd3-60-23-amdt-2-rudder-gust-lock/conflicts","importantCases":"/api/acts/ad-sd3-60-23-amdt-2-rudder-gust-lock/important-cases","documents":"/api/acts/ad-sd3-60-23-amdt-2-rudder-gust-lock/documents"}}