{"id":"F2006B05249","name":"AD/CESSNA 206/44 - Electrical Power Distribution and Control","slug":"ad-cessna-206-44-electrical-power-distribution-and-control","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45571,"registerId":"commonwealth-F2006B05249-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 206/44 - Electrical Power Distribution and Control","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)  \nCessna 206 Series Aeroplanes\n\nAD/CESSNA 206/44 Electrical Power Distribution and Control 8/86\n\n| Applicability: | All Cessna Model U206G and FAA STC SA2353NM (Soloynumbers: | TU206G aeroplanes modified in accordance with U.S. Turbine Conversion) with the following serial |\n| -------------- | ---------------------------------------------------------- | ------------------------------------------------------------------------------------------------ |\n|                | CESSNA SERIAL NUMBER                                       | SOLOY DATA PLATE NO                                                                              |\n|                | U20603989                                                  | 763-013                                                                                          |\n|                | U20604266                                                  | 763-001                                                                                          |\n|                | U20604287                                                  | 763-003                                                                                          |\n|                | U20604881                                                  | 763-014                                                                                          |\n|                | U20605232                                                  | 763-005                                                                                          |\n|                | U20605567                                                  | 763-002                                                                                          |\n|                | U20605584                                                  | 763-015                                                                                          |\n|                | U20605745                                                  | 763-008                                                                                          |\n|                | U20605936                                                  | 763-006                                                                                          |\n|                | U20606065                                                  | 763-007                                                                                          |\n|                | U20606227                                                  | 763-004                                                                                          |\n|                | U20606381                                                  | 763-011                                                                                          |\n|                | U20606628                                                  | 763-010                                                                                          |\n|                | U20606768                                                  | 763-012                                                                                          |\n|                | U20606816                                                  | 763-009                                                                                          |\n\nRequirement: 1. Replace the voltage regulator in accordance with Soloy Service Bulletin 04-763. 2. For aeroplanes with S/Nos. U20604266, U20604287, U20605232, U20605567,\n\nU20605745, U20605936, U20606065 and U20606227, modify the electrical system circuit breaker installation in accordance with Soloy Service Bulletin 02- 763.\n\nNote: FAA AD 86-11-07 Amendment 39-5324 refers.\n\nCompliance: For Para 1: Within 100 hours time in service after 31 August 1986\\. For Para 2: Within 200 hours time in service after 31 August 1986.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBackground: 1. The existing voltage regulator installation has been shown to interfere with the ADF system such as to cause erroneous bearing information to be displayed.\n\n2. The engine start circuit and the auto feather circuit are at present connected to the same circuit breaker. Opening this circuit breaker by an electrical fault or by pilot action will render both circuits inoperative.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains narrowly focused on two electrical issues: regulator-induced ADF interference and a shared circuit-breaker single-point failure. It requires specified hardware replacement and modification for a defined set of serial-numbered aeroplanes, consistent with the directive's stated safety purpose; it has not expanded beyond that original remedial scope."},"complexity_factors":["Two discrete mandated actions (voltage regulator replacement; circuit breaker modification)","Short compliance windows with fixed hours-in-service (100 and 200 hours)","Applicability limited to one model and a finite list of serial numbers (approx. 15 aircraft listed)","Cross-reference to two Soloy Service Bulletins (02-763 and 04-763) which contain the technical detail","Reference to an FAA AD (86-11-07), creating an external cross-reference but not complex conditional logic"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- Applies to certain Cessna U206G aeroplanes and those converted under FAA STC SA2353NM (Soloy TU206G) with the listed serial numbers (see Applicability list).  \n- Requires two specific maintenance actions:\n  - Para 1: Replace the aircraft's voltage regulator according to Soloy Service Bulletin 04-763. (This is a hardware replacement carried out to the supplier's instructions.)  \n  - Para 2: For the subgroup of serial numbers specifically listed, modify the electrical circuit-breaker installation in accordance with Soloy Service Bulletin 02-763. (This changes breaker wiring/arrangement so two circuits are no longer dependent on a single breaker.)\n- Compliance timing: Para 1 must be done within 100 hours time-in-service after 31 August 1986; Para 2 must be done within 200 hours time-in-service after 31 August 1986.  \n- The directive cross-references FAA AD 86-11-07 Amendment 39-5324.\n\n**Who is affected**\n\n- Owners and operators of the listed Cessna U206G and Soloy-converted TU206G aeroplanes (specific serial numbers set out in the Applicability table).  \n- Maintenance organisations or licensed aircraft engineers who perform the mandated work.  \n- Soloy (the holder of the service bulletins) as the provider of the required technical instructions and replacement parts.\n\n**Why it matters (official rationale and practical effect)**\n\n- Officially, the voltage regulator installation can interfere with the ADF (Automatic Direction Finder), producing incorrect bearing information (safety risk for navigation) (Background para 1).  \n- Also, the engine start circuit and the auto-feather circuit were tied to the same circuit breaker; if that breaker opens (either from a fault or pilot action) both circuits would become inoperative, creating a single point of failure (Background para 2).  \n- Mechanically, replacing the regulator and separating/modifying the breaker installation reduces the chance of navigation instrument error and removes a single point of electrical failure affecting two critical circuits.\n\n**Who pays, who decides, and what changes in behaviour**\n\n- Aircraft owners/operators pay for parts, labour and downtime to have the Service Bulletin work carried out (owner/operator cost).  \n- A licensed maintenance organisation or authorised engineer decides how to implement the Service Bulletin instructions and signs off the work (decision and certification by maintenance provider).  \n- Operators must schedule the mandated work within the specified hours-in-service, keep compliance records, and will change maintenance planning and aircraft availability until the work is complete (behavioural change: maintenance scheduling, potential short-term grounding or restricted operations until compliance).\n\n**Costs, incentives and trade-offs**\n\n- Direct costs: purchase of replacement voltage regulator and any parts required by the Soloy Service Bulletins, plus labour and aircraft downtime.  \n- Concentrated benefit: Soloy (as the SB author and likely parts supplier) is the technical source of the mandated modification, so the commercial work flows to them or approved suppliers. The directive itself requires following Soloy SBs (Requirement paras 1–2).  \n- Operators gain reduced operational risk (less chance of ADF error and fewer single-point electrical failures) at the expense of the direct compliance cost and aircraft out-of-service time.  \n- There is limited operational choice: either carry out the mandated work within the compliance window or risk regulatory non‑compliance and potential grounding/enforcement action by the regulator.\n\n**Implementation risks and compliance burden**\n\n- Implementation depends on availability of the correct replacement parts and accurate execution of Soloy's instructions; delays or incorrect installations create residual risk.  \n- Maintenance organisations must record compliance and certify the work, adding administrative steps to normal maintenance practice.  \n- For STC-modified aeroplanes, installers must ensure the Service Bulletin work is compatible with the conversion and that the modification is documented against the aircraft's records.\n\n**Summary statement**\n\nThis airworthiness directive mandates replacement of a voltage regulator and, for a subset of serial numbers, modification of a circuit-breaker installation to remove an electrical single-point failure and to prevent interference with the ADF. Owners/operators must have the specified Soloy Service Bulletin work carried out within the stated hours-in-service and bear the associated costs, downtime and administrative compliance. The measure redirects specific repair and modification work to the procedures and parts described by Soloy (Requirement, Paras 1–2; Background paras 1–2)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing specific electrical safety issues in a limited fleet of modified aircraft. The scope remains precisely focused on the original safety concerns identified in the background section — ADF interference and shared circuit breaker risks. No scope creep is evident."},"complexity_factors":["Specific applicability limited to 15 individual aircraft serial numbers plus corresponding Soloy data plate numbers","Two distinct technical requirements with different compliance timeframes (100 hours vs 200 hours)","Second requirement applies to subset of 8 specific serial numbers only (nested applicability)","References external technical documents (Soloy Service Bulletins 04-763 and 02-763) without reproducing their content","Cross-reference to corresponding FAA AD 86-11-07 for additional context","Technical aviation terminology requiring specialised knowledge (ADF, auto-feather, time in service)"],"plain_english_summary":"This AD mandates two mandatory electrical fixes for certain Cessna U206G aircraft fitted with the Soloy turbine conversion: replace the voltage regulator (which causes erroneous ADF bearings) and, for specified serial numbers, revise circuit breaker wiring so engine start and auto‑feather don’t share one breaker. \n\nIt affects owners/operators and maintenance organisations of the 15 identified aircraft. The changes address navigation errors and the risk of simultaneous loss of engine restart and auto‑feather protection, both critical for flight safety."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-44-electrical-power-distribution-and-control","history":"/api/acts/ad-cessna-206-44-electrical-power-distribution-and-control/history","analysis":"/api/acts/ad-cessna-206-44-electrical-power-distribution-and-control/analysis","conflicts":"/api/acts/ad-cessna-206-44-electrical-power-distribution-and-control/conflicts","importantCases":"/api/acts/ad-cessna-206-44-electrical-power-distribution-and-control/important-cases","documents":"/api/acts/ad-cessna-206-44-electrical-power-distribution-and-control/documents"}}