{"id":"F2006B10440","name":"AD/HS 125/159 - Wiring Inspections","slug":"ad-hs-125-159-wiring-inspections","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116143,"registerId":"commonwealth-F2006B10440-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/159 - Wiring Inspections","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)  \nBritish Aerospace BAe 125 Series Aeroplanes\n\nAD/HS 125/159 Wiring Inspections 1/2000 DM\n\nApplicability: Model Hawker 1000 series aeroplanes serial numbers 258151, 258159 and 259003\n\nthrough 259052 inclusive.\n\nRequirement: 1. Perform a detailed visual inspection of the PS wire bundle coming from the bung ‘DF’ for chafing against the front ventral tank transfer/crossfeed actuator, in accordance with Raytheon Aircraft Service Bulletin SB 24-3201 dated October 1998.\n\nNote 1: For the purposes of this Airworthiness Directive, a detailed visual inspection is defined as: \"An intensive visual examination of a specific structural area, system, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at intensity deemed appropriate by the inspector. Inspection aids such as mirror, magnifying lenses, etc., may be used. Surface cleaning and elaborate access procedures may be required.\"\n\n    2. Perform the applicable action when the following conditions are found during the Requirement 1 inspection:\n\n    No chafing \\- Ensure a minimum 0.25-inch clearance exists between the PS wire bundle and valve actuator; and install spiral wrap, as necessary, in accordance with the service bulletin.\n\n    b. Chafing on a 22, 20, 16, or 14 gauge (non-shielded) wire \\- Repair chafed wire by splicing the damaged section using MIL-S-81824/1 splices. Ensure a minimum 0.25-inch clearance exists between the wire bundle and valve actuator; and install spiral wrap, as necessary, in accordance with the service bulletin.\n\n    c. Chafing on a 10 gauge wire \\- Replace the entire wire with a new 10 gauge wire. Ensure a minimum 0.25-inch clearance exists between the wire bundle and valve actuator; and install spiral wrap, as necessary, in accordance with the service bulletin.\n\n    3. Perform a detailed visual inspection of the shielded wires going to the fuel probe ‘G’ for chafing against the wing transfer valve actuator and mounting screws, in accordance with Raytheon Aircraft Service Bulletin SB 24-3201 dated October 1998.\n\n    4. Perform the applicable action when the following conditions are found during the Requirement 3 inspection:\n\n    No chafing \\- Ensure a minimum 0.25-inch clearance exists between the wire bundle and valve actuator; and install spiral wrap, as necessary, in accordance with the service bulletin.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n    b. Chafing \\- Replace the entire shielded wire with a new shielded wire. Ensure a minimum 0.25-inch clearance exists between the wire bundle and valve actuator; and install spiral wrap, as necessary, in accordance with the service bulletin.\n\n    5. Perform a borescope inspection of the entire forward wing spar/forward ventral tank area for chafing of any other wire or wire bundle; and install spiral wrap, as necessary; in accordance with Raytheon Aircraft Service Bulletin SB 24-3201 dated October 1998.\n\n    6. Perform the applicable action when the following conditions are found during the Requirement 5 inspection:\n\n    No chafing \\- No further action is required by this Airworthiness Directive.\n\n    b. Chafed wire or wire bundle \\- Repair in accordance with a method approved by the Head, Certification Standards Branch, Standards Division, CASA. For a repair method to be approved by the Head, Certification Standards Branch, as required by this paragraph, the approval letter must specifically reference this Airworthiness Directive.\n\nNote 2: FAA AD 99-23-10 Amdt 39-11406 refers.\n\nCompliance: 1. Within 50 hours time in service after 17 December 1999.\n\n    2. Prior to further flight.\n\n    3. Within 50 hours time in service after 17 December 1999.\n\n    4. Prior to further flight.\n\n    5. Within 50 hours time in service after 17 December 1999.\n\n    6. Prior to further flight.\n\nThis Airworthiness Directive becomes effective on 17 December 1999.\n\nBackground: Raytheon has received a report of wire bundle chafing against the forward tank transfer/crossfeed valve which caused an electrical short and resulted in the failure of a landing light. This directive is intended to prevent a short circuit caused by wire chafing, which can cause a fire in the ventral fuel tank area.","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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive, as written, applies only to specified Hawker 1000 serial numbers and to identified wiring locations and actions. The text does not indicate any change to that applicability or a broader scope beyond the stated serial numbers and wiring areas (Applicability; Requirements)."},"complexity_factors":["Limited applicability to a small set of serial numbers reduces scope complexity (Applicability).","Multiple inspection methods required (detailed visual and borescope) and a defined inspection standard add procedural detail (Requirement 1, 3, 5; Note 1).","Different corrective actions depending on wire type and gauge (repair splices for #22–14, replace #10, replace shielded wires) increase technical decision points for maintainers (Requirement 2, 4).","Mandatory minimum clearance and installation of spiral wrap is prescriptive but straightforward to implement (Requirements 2, 4, 5).","Some repairs require approval from CASA's Head, Certification Standards Branch, creating an administrative approval step for non-standard fixes (Requirement 6b).","Compliance timing is strict (within 50 hours TIS or prior to further flight), which imposes scheduling constraints on operators (Compliance).","The AD references an external service bulletin (Raytheon SB 24-3201) and an FAA AD, so maintainers must cross-check external documents for procedures and context (Requirements 1, 3, 5; Note 2)."],"plain_english_summary":"This Airworthiness Directive requires specific Hawker 1000 aeroplanes (serials 258151, 258159 and 259003–259052) to receive targeted visual and borescope inspections of certain wire bundles and shielded wires, with prescribed repair, replacement, and protective spiral wrap to establish at least a 0.25‑inch clearance. It aims to prevent electrical shorts and possible ventral fuel‑tank fire following reported chafing that caused an electrical short and landing‑light failure."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains focused scope on its original safety purpose. It addresses a specific wiring chafing issue in a defined aircraft type and serial number range, exactly as intended when issued. The directive does not expand beyond the original reported safety concern (wire chafing in the ventral fuel tank area) or the specific aircraft population affected."},"complexity_factors":["Multiple conditional branches (6 separate requirements with nested sub-conditions)","Technical aviation terminology requiring specialized knowledge (borescope inspections, wire gauges, MIL-S-81824/1 splices)","Cross-reference to external technical document (Raytheon Service Bulletin SB 24-3201)","Specific measurement requirements (0.25-inch clearance) with technical precision","Dual compliance timelines (50 hours time-in-service vs prior-to-further-flight)","Bureaucratic approval requirement for certain repairs (Head of Certification Standards Branch approval with specific AD reference)","Limited applicability to specific serial number range creating identification burden"],"plain_english_summary":"This CASA safety order requires owners/operators of specified Hawker 1000 aircraft to inspect and remedy wiring chafing in fuel-tank/wing areas that could short and ignite. Aerial inspections (including borescope checks) and repairs—clearance/protection, splices, or replacement—must be done within the stated flight-hour deadlines and before further flight.  \n\nIt targets specific serial-numbered jets to prevent electrical fires that could destroy the aircraft and kill occupants."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-159-wiring-inspections","history":"/api/acts/ad-hs-125-159-wiring-inspections/history","analysis":"/api/acts/ad-hs-125-159-wiring-inspections/analysis","conflicts":"/api/acts/ad-hs-125-159-wiring-inspections/conflicts","importantCases":"/api/acts/ad-hs-125-159-wiring-inspections/important-cases","documents":"/api/acts/ad-hs-125-159-wiring-inspections/documents"}}