{"id":"F2006B03919","name":"AD/BEECH 400/17 - Engine Fire Extinguisher Squib Wiring","slug":"ad-beech-400-17-engine-fire-extinguisher-squib-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43528,"registerId":"commonwealth-F2006B03919-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.","sortOrder":0},{"sectionNumber":"AD/BEECH 400/17 Engine Fire Extinguisher","sectionType":"part","heading":"AD/BEECH 400/17 Engine Fire Extinguisher Squib Wiring 5/2000","content":"# AD/BEECH 400/17 Engine Fire Extinguisher Squib Wiring 5/2000\n\nDM\n\nApplicability: Model 400A series aeroplanes, serial numbers RK-45 and RK-49 through RK-209 inclusive; Model 400T series aeroplanes (T-1A), serial numbers TT-01 through TT- 180 inclusive; and Model 400T series aeroplanes (TX), serial numbers TX-01 through TX-09 inclusive.\n\nRequirement: 1. Perform a one-time general visual inspection of the left and right engine fire extinguisher bottle squibs, in accordance with Raytheon Aircraft Service Bulletin SB 26-3250, Revision 1, dated July 1999, to detect incorrect wiring.\n\nNote 1: For the purposes of this Directive, a general visual inspection is defined as: \"A visual examination of an interior or exterior area, installation, or assembly to detect obvious damage, failure, or irregularity. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight, or drop-light, and may require removal or opening of access panels or doors. Stands, ladders, or platforms may be required to gain proximity to the area being checked.\"\n\n    2. If, as a result of the Requirement 1 inspection, any incorrect wiring is detected, repair it in accordance with SB 26-3250, Revision 1, dated July 1999.\n\n    3. Modify and re-label the wiring of the left and right engine fire extinguisher bottle squibs, in accordance with SB 26-3250, Revision 1, dated July 1999.\n\nNote 2: FAA AD 2000-05-06 Amdt 39-11615 refers.","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wiring defect in specific Beechcraft 400 series aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive with only 3 numbered requirements","Heavy reliance on external technical document (Raytheon Service Bulletin SB 26-3250) — the actual detailed instructions are not reproduced in the AD itself","Precise applicability limited by specific aircraft model and serial number ranges (3 distinct groups with non-contiguous serial numbers)","One defined term ('general visual inspection') with embedded technical definition","Single cross-reference to FAA AD 2000-05-06 for additional context","No nested exceptions, conditional logic, or alternative compliance methods"],"plain_english_summary":"This AD orders owners/operators of certain Beechcraft 400 series (including T‑1A/TX military variants, specific serial ranges) to inspect, repair, modify and re‑label engine fire‑extinguisher squib wiring per Raytheon Service Bulletin SB 26‑3250 Rev 1. It addresses factory miswiring that could prevent or wrongly trigger extinguisher activation in an engine fire, creating a serious in‑flight safety risk."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD is narrowly focused on detecting and correcting incorrect wiring of engine fire extinguisher squibs on specific Beech 400/400A/400T serial numbers. The actions required (one-time inspection, repair if found, and modification/re-labelling per the Raytheon service bulletin) align with a single safety corrective purpose and do not expand the instrument's scope beyond that safety objective."},"complexity_factors":["Narrow technical scope limited to specific Beech 400/400A/400T serial number ranges (straightforward applicability)","Three operative requirements (inspection, repair if needed, modification and relabelling) with a single external technical reference (Raytheon SB 26-3250 Rev 1)","Definition of \"general visual inspection\" provided (reduces ambiguity)","Cross-reference to FAA AD 2000-05-06 (external harmonisation reference)","No explicit compliance deadline provided in the excerpt (introduces minor interpretive complexity)","Dependence on an external service bulletin for technical detail (requires access to and reading of another document)"],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Requires operators of certain Beech 400/400A/400T aeroplanes to perform a one-time, general visual inspection of the left and right engine fire extinguisher bottle squibs to check for incorrect wiring (Requirement 1).\n- If incorrect wiring is found, it must be repaired following the steps in Raytheon Aircraft Service Bulletin SB 26-3250, Revision 1, dated July 1999 (Requirement 2).\n- Requires modification and re-labelling of the left and right engine fire extinguisher bottle squib wiring in accordance with the same service bulletin (Requirement 3).\n- The AD defines what a \"general visual inspection\" means for this purpose (Note 1) and cross-references an FAA AD for related information (Note 2).\n\n**Who is affected\n\n- Owners and operators of Beech Model 400A series aeroplanes with serial numbers RK-45 and RK-49 through RK-209, and Beech Model 400T series aeroplanes (T-1A) serial numbers TT-01 through TT-180, and (TX) serial numbers TX-01 through TX-09 (Applicability).\n- Maintenance organisations, licensed aircraft maintenance engineers (AMEs), or other contracted repair facilities that carry out the inspection, repairs and wiring modification.\n\n**Why it matters (stated purpose and practical effect)\n\n- Stated purpose: to detect and correct incorrect wiring of engine fire extinguisher squibs. The practical effect is to reduce the risk that an engine fire extinguisher will not operate as intended because of mis-wiring.\n\n**Costs, who pays, and who decides\n\n- Owners/operators pay for labour, any replacement parts and aircraft downtime necessary to carry out the inspection, repairs and wiring modification (Requirements 1–3; SB 26-3250 Rev 1). \n- The CASA delegate issued the AD under subregulation 39.1(1) of CAR 1998 and therefore decides the mandatory nature of the action; the precise technical steps are set by the Raytheon service bulletin the AD mandates.\n- Maintenance providers (OEM-authorised and independent) can perform the work provided they follow the service bulletin; access to the service bulletin and competence to carry out the wiring work are preconditions to performing the task.\n\n**Implementation mechanics and compliance burden\n\n- The AD makes compliance conditional on completing the inspection and, if required, the repair and modification according to SB 26-3250 Rev 1. The AD sets the inspection procedure level by defining a \"general visual inspection\" (Note 1).\n- The AD text as provided does not state a specific calendar or flight-hour compliance deadline in the excerpt; that can create ambiguity about the required timing unless a separate compliance section (not shown here) or the service bulletin provides timing. Absent an explicit deadline, operators must check the full AD publication or SB for any specified compliance interval.\n- The actions are one-time (not recurring), which limits ongoing compliance costs, but may cause temporary aircraft downtime.\n\n**Trade-offs, risks and likely effects on private behaviour\n\n- Concentrated benefits: the safety improvement accrues to the specific aircraft/crew/passengers of the affected aeroplanes. The cost is concentrated on those aircraft owners/operators.\n- Diffuse administrative cost: regulatory oversight and record-keeping are minor compared with the direct inspection/repair cost.\n- Opportunity cost: scheduled maintenance slots and AME labour used for this directive cannot be used for other work while the aircraft is grounded for the inspection/repair.\n- Substitution effects: operators may choose to have the work done by the most cost-effective licensed provider, or delay until scheduled maintenance if timing permits (subject to any compliance deadline).\n- Implementation risk: incorrect inspection or substandard repair could leave the unsafe condition unresolved; the AD reduces this risk by mandating the manufacturer service bulletin as the technical standard.\n\n**Interaction with external regulation and practice\n\n- The AD mandates compliance with a Raytheon service bulletin (SB 26-3250 Rev 1, July 1999). That makes the manufacturer’s technical procedure the operative standard for the work.\n- Note 2 cross-references FAA AD 2000-05-06, indicating the issue has been addressed in harmonised international airworthiness action; operators commonly consult both documents for context.\n\n**Net effect in plain terms\n\n- If you own or operate an affected Beech 400/400A/400T with the listed serial numbers, you must arrange a one-time visual inspection of the engine fire bottle squib wiring, fix any incorrect wiring per the Raytheon service bulletin, and then modify and re-label the wiring per that bulletin. You pay for the work; a CASA-issued AD makes it mandatory. The AD aims to ensure the engine fire extinguisher operates reliably by correcting wiring errors (Requirements 1–3; SB 26-3250 Rev 1)."},"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-beech-400-17-engine-fire-extinguisher-squib-wiring","history":"/api/acts/ad-beech-400-17-engine-fire-extinguisher-squib-wiring/history","analysis":"/api/acts/ad-beech-400-17-engine-fire-extinguisher-squib-wiring/analysis","conflicts":"/api/acts/ad-beech-400-17-engine-fire-extinguisher-squib-wiring/conflicts","importantCases":"/api/acts/ad-beech-400-17-engine-fire-extinguisher-squib-wiring/important-cases","documents":"/api/acts/ad-beech-400-17-engine-fire-extinguisher-squib-wiring/documents"}}