{"id":"F2006B10816","name":"AD/INST/15 - AP106 Automatic Pilot Gain Programmer Type 161H-1 - Modification","slug":"ad-inst-15-ap106-automatic-pilot-gain-programmer-type-161h-1-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56294,"registerId":"commonwealth-F2006B10816-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/15 - AP106 Automatic Pilot Gain Programmer Type 161H-1 - Modification","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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Instruments and Automatic Pilots\n\n \n\nAD/INST/15 AP106 Automatic Pilot Gain Programmer\n\nType 161H-1 - Modification\n\nApplicability: Collins Gain Programmer Type 161H-1. Document:  Collins 161H-1 Gain Programmer SB No. 6. Compliance:               Before 30 July 1975.\n\n\n4/75\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive from 1975 addressing a specific technical defect in a specific aircraft component. It has not expanded beyond its original narrow scope."},"complexity_factors":["Extremely short document (approximately 100 words)","Single, clearly defined applicability (one specific part number)","Single compliance requirement with fixed deadline","No defined terms section","No cross-references to other legislation beyond basic citation","No conditional logic or exceptions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nIt requires owners or operators of aircraft fitted with a specific piece of equipment — the **Collins Gain Programmer Type 161H-1** (part of an automatic pilot system) — to carry out a modification before 30 July 1975.\n\n**Who it affects:**\nAnyone operating an aircraft with this specific Collins automatic pilot component installed.\n\n**Why it matters:**\nAirworthiness Directives are legally binding. If you don't comply, your aircraft is considered unairworthy and cannot legally fly. This particular directive addresses a safety issue with the gain programmer (a device that helps control how aggressively the autopilot responds) by requiring a specific modification outlined in **Collins Service Bulletin No. 6**.\n\n**Key details:**\n- **Equipment affected:** Collins Gain Programmer Type 161H-1\n- **Required action:** Modification per Collins SB No. 6\n- **Deadline:** Before 30 July 1975\n- **Legal basis:** Civil Aviation Regulations 1988, Part 39"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument as presented applies specifically to the Collins Gain Programmer Type 161H-1 and requires the modification set out in Collins 161H-1 Gain Programmer SB No. 6 to be completed before 30 July 1975. The text contains no indication that its scope has been altered from that stated applicability or expanded beyond the specified unit and service bulletin."},"complexity_factors":["Very narrow technical scope: applies only to Collins Gain Programmer Type 161H-1 (Applicability).","Single referenced corrective document: one manufacturer service bulletin is specified (Document).","Clear single compliance deadline reduces procedural ambiguity (Compliance).","Technical work may require specialised avionics skills and parts, introducing operational and supply-chain complexity not detailed in the AD (Document).","Enforcement sits within aviation regulatory framework, which carries formal certification and record-keeping requirements even for straightforward ADs (header)."],"plain_english_summary":"What this instrument does, mechanically\n\n- Requires a specific modification to the Collins AP106 automatic pilot gain programmer, Type 161H-1. The action to be carried out is the modification described in the manufacturer’s service document identified as \"Collins 161H-1 Gain Programmer SB No. 6\" (Document: Collins 161H-1 Gain Programmer SB No. 6). (Applicability; Document)\n- Sets a mandatory deadline by which the modification must be completed: before 30 July 1975. (Compliance)\n\nWho it affects\n\n- Aircraft owners and operators that have a Collins Gain Programmer Type 161H-1 installed must ensure the modification is performed. (Applicability)\n- Maintenance organisations, avionics technicians and parts suppliers who carry out or supply work under the manufacturer’s service bulletin are likely to be engaged to perform the modification. (Document)\n\nWhy it matters (stated purpose and practical implications)\n\n- The document requires a safety-related change to a component of the automatic pilot system. The schedule lists the modification as mandatory and specifies the service bulletin to be followed, indicating the regulator requires that the manufacturer’s procedure be implemented. (Document; Compliance)\n- Who pays: owners/operators must meet the direct costs (parts, technician labour, aircraft downtime) of complying with the service bulletin. (Applicability; Document)\n- Who decides and enforces: the requirement is published in the Commonwealth schedule of Airworthiness Directives under the Civil Aviation Regulations and is therefore enforced by the relevant civil aviation authority. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES)\n\nImplementation, incentives and trade-offs (mechanical effects, costs and risks)\n\n- Compliance burden: the practical burden is the technical work required to modify the unit per the specified service bulletin and the associated downtime. The AD gives a single clear compliance deadline. (Document; Compliance)\n- Incentives: affected operators are incentivised to schedule the work before the deadline to remain compliant with the airworthiness requirements. Maintenance providers have an opportunity to supply the service. (Applicability; Document)\n- Trade-offs and opportunity costs: time and money spent on the modification are resources not spent on other maintenance or operational activity; operators may choose between modifying the existing unit or replacing it if that is economical, subject to meeting the AD’s requirements. (Document)\n- Implementation risk: compliance depends on availability of the service bulletin, parts and qualified technicians; the AD itself specifies the procedure to be followed but does not detail logistics such as parts supply or certification steps beyond referencing the SB. (Document)\n\nConcentration of costs and benefits\n\n- Costs are concentrated on owners/operators of aircraft fitted with this specific unit (Applicability). Benefits (safety or performance improvements claimed by the manufacturer or regulator) accrue to those aircraft and to anyone relying on their safe operation. The instrument identifies the technical action and the deadline, leaving the economic burden and choices about timing and service providers to the affected parties. (Applicability; Document; Compliance)\n\nSource citations\n\n- Applicability: \"Collins Gain Programmer Type 161H-1.\" (Applicability)\n- Required document: \"Collins 161H-1 Gain Programmer SB No. 6.\" (Document)\n- Compliance deadline: \"Before 30 July 1975.\" (Compliance)\n- Issuing context: published in the Commonwealth schedule of Airworthiness Directives under the Civil Aviation Regulations. (header)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-15-ap106-automatic-pilot-gain-programmer-type-161h-1-modification","history":"/api/acts/ad-inst-15-ap106-automatic-pilot-gain-programmer-type-161h-1-modification/history","analysis":"/api/acts/ad-inst-15-ap106-automatic-pilot-gain-programmer-type-161h-1-modification/analysis","conflicts":"/api/acts/ad-inst-15-ap106-automatic-pilot-gain-programmer-type-161h-1-modification/conflicts","importantCases":"/api/acts/ad-inst-15-ap106-automatic-pilot-gain-programmer-type-161h-1-modification/important-cases","documents":"/api/acts/ad-inst-15-ap106-automatic-pilot-gain-programmer-type-161h-1-modification/documents"}}