{"id":"F2006B03064","name":"AD/B747/161 - Triple Channel Autoland Autopilots","slug":"ad-b747-161-triple-channel-autoland-autopilots","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42423,"registerId":"commonwealth-F2006B03064-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B747/161 - Triple Channel Autoland Autopilots","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 747 Series Aeroplanes\n\nAD/B747/161 Triple Channel Autoland Autopilots 7/96\n\nApplicability: This Directive is applicable to Model 747-100, \\-200, \\-300 and SP series aeroplanes, equipped with triple channel autoland autopilot systems, identified in Boeing Alert Service Bulletins 747-22A2212 Revision 1 dated 27 April 1995 and 747-22A2213 Revision 2 dated 22 June 1995.\n\nRequirement: 1. Install a diode and a marker on the E1-4, E1-5 and E1-6 shelves and make wiring changes to the flight mode annunciator of the autopilot/flight director system in accordance with either Boeing Alert Service Bulletins 747-22A2212 Revision 1 dated 27 April 1995, 747-22A2213 Revision 1 dated 27 April 1995 or 747-\n\n22A2213 Revision 2 dated 22 June 1995, as applicable.\n\n2. Perform an operational test of the newly installed diodes in accordance with either Boeing Alert Service Bulletins 747-22A2212 Revision 1 dated 27 April 1995, 747- 22A2213 Revision 1 dated 27 April 1995 or 747-22A2213 Revision 2 dated\n\n22 June 1995, as applicable.\n\nNote: FAA AD 96-06-06 Amdt 39-9543 refers.\n\nCompliance: For Requirement 1 \\- Prior to 31 December 1997.\n\nNote: Following compliance with Requirement 1 and upon application to the local Civil Aviation Safety Authority Airworthiness District Office, changes introduced to the Limitations Section of the Aircraft Flight Manual pertaining to Triple Channel Autoland Autopilot operation, may be removed.\n\nFor Requirement 2 \\- Prior to further flight after the accomplishment of Requirement 1 and thereafter at intervals not to exceed 20,000 hours time in service.\n\nBackground: Actions specified by this Directive are designed to ensure that flightcrew are aware of configuration changes to the autoland system during landing in the event of a change from fail-operational to fail-passive mode.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive maintains a focused scope: applicable only to the listed Boeing 747-100/200/300/SP models equipped with the specified triple‑channel autoland systems and requires the hardware/wiring modifications and testing described (Applicability; Requirements 1–2; Background). It does not expand applicability beyond those aircraft or add new categories of obligations beyond the cited service bulletin work and recurring tests."},"complexity_factors":["Technical avionics modification: physical installation of diodes/markers and wiring changes (Requirement 1).","Operational testing and recurring interval: initial test prior to further flight and recurrent tests every 20,000 hours (Requirement 2; Compliance).","Multiple service bulletin versions referenced, requiring matching exact SB revision to aircraft (Requirement 1 & 2; Applicability).","Compliance deadline for the modification: prior to 31 December 1997 (Compliance for Requirement 1), creating scheduling pressure for operators.","Administrative step to request CASA Airworthiness District Office approval to remove AFM Limitations after modification (Note after Compliance).","Narrow applicability to specific 747 models and systems, so workforce and parts must match those variants (Applicability).","Cross-reference to FAA AD 96-06-06, implying coordination with foreign regulator guidance (Note)."],"plain_english_summary":"This directive requires operators of certain Boeing 747-100/200/300 and SP aeroplanes with triple‑channel autoland systems to install diodes and markers, make wiring changes per specified Boeing Alert Service Bulletins, and carry out operational tests initially and every 20,000 flight hours. Operators must comply by 31 December 1997 and may apply to CASA to remove temporary AFM limitations. It is intended to ensure flightcrew are alerted if the autoland mode changes from fail‑operational to fail‑passive during landing; operators bear the modification, testing and administrative costs."},"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":false,"description":"This AD remains tightly scoped to its original purpose: addressing a specific avionics configuration issue in particular Boeing 747 variants. It has not expanded beyond the technical safety fix for triple-channel autoland awareness."},"complexity_factors":["Single, specific technical requirement with clear mechanical and electrical actions","Limited applicability — only four specific Boeing 747 model series with specific equipment","References to external Boeing Service Bulletins rather than reproducing technical specifications inline","Simple two-part compliance structure (install, then test) with one fixed deadline and one recurring interval","Minimal defined terms — only standard aviation acronyms (AD, FAA, E1-4 shelf references)","No nested exceptions or conditional logic — straightforward 'applicable or not' determination"],"plain_english_summary":"Australia's CASA AD mandates owners/operators of certain Boeing 747-100/200/300/SP aircraft with triple‑channel autoland systems to modify their autopilot annunciation and install a diode/marker so crew are alerted if the system degrades from fail‑operational to fail‑passive. An operational check is required immediately after modification and every 20,000 flight hours. The hardware deadline was 31 December 1997. This prevents unannounced loss of automatic landing protection in low‑visibility approaches."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b747-161-triple-channel-autoland-autopilots","history":"/api/acts/ad-b747-161-triple-channel-autoland-autopilots/history","analysis":"/api/acts/ad-b747-161-triple-channel-autoland-autopilots/analysis","conflicts":"/api/acts/ad-b747-161-triple-channel-autoland-autopilots/conflicts","importantCases":"/api/acts/ad-b747-161-triple-channel-autoland-autopilots/important-cases","documents":"/api/acts/ad-b747-161-triple-channel-autoland-autopilots/documents"}}