{"id":"F2006B04940","name":"AD/CESSNA 150/42 - Battery/Battery Contactor Cable Routing","slug":"ad-cessna-150-42-battery-battery-contactor-cable-routing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44790,"registerId":"commonwealth-F2006B04940-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/42 - Battery/Battery Contactor Cable Routing","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 150, F150, 152 & F152 Series Aeroplanes\n\nAD/CESSNA 150/42 Battery/Battery Contactor Cable Routing 11/88 DM\n\nApplicability: Aircraft model 150D, 150E, 150F, 150G, 150H, 150J, 150K, 150L, 150M, A150K, A150L, A150M, F150G, F150H, F150J, F150K, F150L, F150M, FA150K, FA150L,\n\nFRA150L and FRA150M all serial numbers, which have undergone any modifications to relocate the battery from the firewall to the aft fuselage, and\n\nModel 150, 150A, 150B, 150C all serial numbers, which have undergone any modifications in which the battery has been moved from its location just aft of the baggage compartment aft bulkhead to any other aft position.\n\nRequirement: To prevent failure of the up elevator cable, perform the following:\n\n    (a) Tie the “battery to battery contactor” cable to the lock pin which attaches the battery box cover to the battery box using either MIL-C-5649 cord, MS17821 or MS3367 tiedown strap to achieve a minimum of one inch clearance between the battery cable and the elevator up cable.\n\n    (b) Visually inspect the battery cable and elevator cable for damage. Prior to next flight, repair any such damage found.\n\nCompliance: Within 25 hours time in service after 20 August 1988.\n\nBackground: A recent fatal accident \\[FAA AD 88-15-06 Amendment 39-5977 refers\\] involving a Cessna 150D occurred after modification to relocate the battery box from the firewall to the aft fuselage. The up elevator control cable was found to have chafed against the battery to battery contactor cable such that the insulation on the latter cable was destroyed resulting in an electrical short circuit of the battery cable. This produced sufficient electrical resistance and subsequent heat to cause the up elevator cable to fail.\n\nInspection of other aircraft with similar modifications indicates that this condition could develop in these aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive targets the specific subset of aircraft modified to relocate the battery and prescribes a targeted routing and inspection remedy. It does not broaden regulatory reach beyond those modified aircraft or introduce recurring obligations; it imposes a time‑limited, one‑off compliance requirement."},"complexity_factors":["Narrow applicability: only specific Cessna 150/152 models with battery relocated from original positions (Applicability).","Simple, prescriptive remedy: tie-down method and minimum 1 inch clearance specified (Requirement (a)).","Immediate visual inspection and repair mandated before next flight for any damage found (Requirement (b)).","Short, one-off compliance window: within 25 hours TIS after a fixed date (Compliance) — no ongoing inspection schedule.","Low technical discretion: specified materials (MIL‑C‑5649, MS17821 or MS3367) reduce installer variability (Requirement (a)).","High safety consequence but limited procedural complexity — action is straightforward but safety‑critical."],"plain_english_summary":"Requires securing the “battery to battery contactor” cable to the battery-box cover lock pin (using specified cord/straps) so it stays at least one inch clear of the up‑elevator cable, plus a visual inspection and repair of any damage before the next flight. Applies to listed Cessna 150/152 series aircraft that have had the battery relocated; owners/operators must complete the work within 25 hours time in service after 20 August 1988 to reduce the risk of elevator‑cable chafe and failure."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness issue identified through accident investigation. It has not expanded beyond its original purpose of preventing elevator cable failure in modified Cessna 150 series aircraft."},"complexity_factors":["Single, specific technical requirement with clear mechanical action (cable tie placement)","Limited applicability scope (specific aircraft models with specific modifications)","No nested exceptions or conditional logic — compliance is absolute","Only 2 defined terms implicitly used (MIL-C-5649 cord, MS17821/MS3367 tiedown straps — these are standard military specification references)","Single compliance deadline with straightforward calculation (25 hours time in service after fixed date)","Background section provides clear causal explanation rather than legal cross-referencing"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Cessna 150/152 (and related) aircraft with batteries relocated to the rear fuselage to secure the battery cable clear of the elevator control cable and to inspect and repair any damage before further flight. It’s mandatory, issued after a fatal accident where cable chafing caused a short and snapped the elevator cable, and must be complied with within the stated compliance time."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-42-battery-battery-contactor-cable-routing","history":"/api/acts/ad-cessna-150-42-battery-battery-contactor-cable-routing/history","analysis":"/api/acts/ad-cessna-150-42-battery-battery-contactor-cable-routing/analysis","conflicts":"/api/acts/ad-cessna-150-42-battery-battery-contactor-cable-routing/conflicts","importantCases":"/api/acts/ad-cessna-150-42-battery-battery-contactor-cable-routing/important-cases","documents":"/api/acts/ad-cessna-150-42-battery-battery-contactor-cable-routing/documents"}}