{"id":"F2006B02832","name":"AD/B737/131 Amdt 4 - Electrical Power","slug":"ad-b737-131-amdt-4-electrical-power","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42174,"registerId":"commonwealth-F2006B02832-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Requirement: 1. For Model 737-100 and -2","sectionType":"part","heading":"Requirement: 1. For Model 737-100 and -200 series aeroplanes equipped with battery charger Boeing Part Number (P/N) 10-60701-1:","content":"# Requirement: 1. For Model 737-100 and \\-200 series aeroplanes equipped with battery charger Boeing Part Number (P/N) 10-60701-1:\n\n    Replace the battery charger with a new or serviceable battery charger, Boeing P/N 10-60701-3, in accordance with Chapter 21-10-111 of the Boeing 737 Airplane Maintenance Manual (AMM), and\n    Replace the battery with a new or reconditioned battery in accordance with Chapter 24-31-11 of the Boeing 737 AMM.\n\nIncorporation of Boeing Alert Service Bulletin (ASB) 737-24A1136 dated 27 April 2000 or Revision 1 dated 24 January 2002 or Revision 2 dated 7 August 2003 is optional and allows the battery maintenance to be scheduled in accordance with the Boeing 737 Maintenance Planning Document (MPD).\n\n    2. For Model 737-300, \\-400 and \\-500 series aeroplanes \\- Replace the battery with a new or reconditioned battery in accordance with Chapter 24-31-11 of the Boeing 737 AMM.\n\nIncorporation of ASB 737-24A1136 or Revision 1 or Revision 2 is optional and allows the battery maintenance to be scheduled in accordance with the 737 MPD.\n\n    3. For all Model 737-100, \\-200, \\-300, \\-400 and \\-500 series aeroplanes \\- Perform a test to determine the condition of the Generator Control Unit (GCU) diode CR910 in accordance with Boeing Telex Message M-7200-99-01528 dated 5 March 1999.\n\n    If the diode fails the Requirement 3 test, replace the GCU with a new or serviceable GCU and the battery with a new or reconditioned battery. Repeat the Requirement 3 diode test until successful completion of the test is achieved.\n    Once the Requirement 3 diode test has been successfully completed, repeat the diode test.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"As Amendment 4, the instrument specifies mandatory replacement of charger P/N 10-60701-1 with P/N 10-60701-3 for 737-100/-200s, battery replacement requirements across listed 737 models, and a GCU diode CR910 test with replace-and-repeat until pass. These explicit part-number and test mandates refine the scope of required maintenance actions and introduce a compulsory test-and-repeat regime; incorporation of ASB remains optional and affects scheduling."},"complexity_factors":["Multiple aircraft model groups with different requirements (737-100/-200 vs 737-300/-400/-500).","Part-number specific mandatory replacement (charger P/N 10-60701-1 → 10-60701-3).","Repeated functional testing requirement for GCU diode CR910 with mandatory replacement and repetition until test success.","Cross-references to external Boeing documents (AMM chapters 21-10-111 and 24-31-11, Boeing Telex M-7200-99-01528, ASB 737-24A1136 and its revisions, and the 737 MPD) requiring access to and compliance with manufacturer's maintenance procedures.","Optional incorporation of an ASB affects maintenance scheduling (MPD vs immediate AMM action), introducing operational choices for operators.","Ambiguity in periodicity: directive mandates repeating the diode test until successful and then to \"repeat the diode test\" without an interval, which raises implementation and compliance-recording questions."],"plain_english_summary":"This directive requires operators of specified Boeing 737 models to replace certain battery chargers and batteries and to test the Generator Control Unit diode CR910. For 737‑100/‑200s with charger P/N 10‑60701‑1 the charger must be changed to P/N 10‑60701‑3 and the battery replaced; 737‑300/‑400/‑500s must replace their batteries. If the CR910 diode fails, the GCU and battery must be replaced and the test repeated until it passes. Work must follow Boeing AMM chapters; ASB incorporation is optional and allows MPD scheduling. Operators bear the compliance cost; licensed maintainers perform the work."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be a focused amendment (Amendment 4) to an existing airworthiness directive. The scope remains tightly constrained to electrical power system maintenance on specific Boeing 737 variants. The amendment adds the optional compliance path via Boeing Alert Service Bulletin revisions and clarifies testing protocols, but does not expand beyond the original safety purpose of addressing battery charger and GCU diode reliability issues."},"complexity_factors":["Multiple aircraft model variants with different requirements (737-100/-200 vs -300/-400/-500)","Specific Boeing part numbers referenced (P/N 10-60701-1 and -3)","Cross-references to external Boeing documents: Airplane Maintenance Manual chapters (21-10-111, 24-31-11), Alert Service Bulletin (737-24A1136 with 3 dated versions), Maintenance Planning Document, and a specific Telex Message (M-7200-99-01528)","Conditional logic: 'If the diode fails...' triggers additional replacement and retesting requirements","Nested testing protocol: initial test → conditional replacement → retest until pass → confirmation retest","Optional compliance pathway creates alternative regulatory route (ASB incorporation vs direct compliance)"],"plain_english_summary":"This CASA airworthiness directive mandates electrical repairs and inspections for older Boeing 737s to prevent battery and power-system failures. It affects 737‑100/‑200s with an older charger and 737‑300/‑400/‑500s, requiring charger and/or battery replacement and testing of a Generator Control Unit diode (replace GCU and battery if it fails).\n\nAn alternative compliance path follows Boeing’s Alert Service Bulletin allowing maintenance under Boeing’s planning schedule."},"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-b737-131-amdt-4-electrical-power","history":"/api/acts/ad-b737-131-amdt-4-electrical-power/history","analysis":"/api/acts/ad-b737-131-amdt-4-electrical-power/analysis","conflicts":"/api/acts/ad-b737-131-amdt-4-electrical-power/conflicts","importantCases":"/api/acts/ad-b737-131-amdt-4-electrical-power/important-cases","documents":"/api/acts/ad-b737-131-amdt-4-electrical-power/documents"}}