{"id":"F2006B02853","name":"AD/B737/150 - Fuel Quantity Indicating System - No. 2 Tank Wiring Harness","slug":"ad-b737-150-fuel-quantity-indicating-system-no-2-tank-wiring-harness","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42195,"registerId":"commonwealth-F2006B02853-current","compilationNumber":null,"startDate":"2026-04-01","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/B737/150 Fuel Quantity Indicating Sys","sectionType":"part","heading":"AD/B737/150 Fuel Quantity Indicating System - No. 2","content":"# AD/B737/150 Fuel Quantity Indicating System \\- No. 2\n\nTank Wiring Harness\n\nApplicability: All Model 737-300, \\-400 and \\-500 series aeroplanes.","sortOrder":1},{"sectionNumber":"4/2001","sectionType":"part","heading":"4/2001","content":"# AD/B737/150 Fuel Quantity Indicating System \\- No. 2\n\nTank Wiring Harness\n\nApplicability: All Model 737-300, \\-400 and \\-500 series aeroplanes.\n\n#   \n4/2001","sortOrder":2}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific safety defect in a specific aircraft type. It has not expanded beyond its original purpose of addressing the fuel quantity indicating system wiring harness issue."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 defined term implicitly referenced (the aircraft models)","No cross-references to other legislation beyond CAR 1998 subregulation 39.1(1)","Simple conditional structure: if you operate these specific aircraft, you must comply","Single technical requirement focused on one aircraft system","No nested exceptions or complex definitional sections"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) that requires aircraft owners or operators to fix a specific safety problem.\n\n**What it does:** It orders inspections or repairs to the **fuel quantity indicating system wiring** in the No. 2 fuel tank of certain Boeing 737 aircraft (the -300, -400, and -500 series). This wiring tells the pilots how much fuel is in the tank. If the wiring fails, pilots could get wrong fuel readings — a serious flight safety risk.\n\n**Who it affects:** Anyone who owns, operates, or maintains Boeing 737-300, -400, or -500 aircraft in Australia.\n\n**Why it matters:** Faulty fuel gauges can lead to fuel mismanagement, potentially causing engine failure or emergency landings. This AD ensures the wiring harness (the bundle of wires) in the No. 2 tank is checked and fixed if needed to prevent accidents.\n\n**What must happen:** The aircraft must be inspected and any necessary repairs carried out according to the specific instructions in the directive, by the deadline set in the compliance section (not fully shown here but typically within a set number of flight hours or calendar days)."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The supplied text does not indicate any change to the AD's scope. The directive expressly applies to all Model 737‑300, ‑400 and ‑500 aeroplanes (Applicability) and sets actions to be taken as described in the requirement and compliance sections."},"complexity_factors":["Narrow technical scope: targets the No. 2 tank wiring harness of the fuel quantity indicating system on specific 737 models (source: Applicability).","Cross‑reference to administrative law: issued under subregulation 39.1(1) of CAR 1998, requiring legal/regulatory compliance steps.","Essential details not in the excerpt: the precise corrective actions and timing are contained in the requirement and compliance sections rather than in the summary text, so implementers must consult those sections.","Enforcement discretion: the CASA delegate issues the AD and sets the corrective action (source: opening paragraph), creating administrative decision points.","Operational impact for operators: compliance will impose maintenance work, scheduling and direct costs on aircraft owners/operators (implied by mandatory requirements and compliance timing).","Technical implementation burden: corrective work on wiring harnesses requires qualified maintenance personnel and approved procedures, increasing logistical complexity."],"plain_english_summary":"**What it does:** This Airworthiness Directive requires operators of Boeing 737‑300, ‑400 and ‑500 aeroplanes to carry out specified corrective work on the No. 2 fuel‑tank wiring harness of the fuel‑quantity indicating system. It is issued by the CASA delegate under subregulation 39.1(1) of CAR 1998.\n\n**Who it affects and why it matters:** The directive binds aircraft owners/operators to complete the actions set out in the requirement section within the times stated in the compliance section; operators therefore bear the compliance cost and scheduling impact."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-150-fuel-quantity-indicating-system-no-2-tank-wiring-harness","history":"/api/acts/ad-b737-150-fuel-quantity-indicating-system-no-2-tank-wiring-harness/history","analysis":"/api/acts/ad-b737-150-fuel-quantity-indicating-system-no-2-tank-wiring-harness/analysis","conflicts":"/api/acts/ad-b737-150-fuel-quantity-indicating-system-no-2-tank-wiring-harness/conflicts","importantCases":"/api/acts/ad-b737-150-fuel-quantity-indicating-system-no-2-tank-wiring-harness/important-cases","documents":"/api/acts/ad-b737-150-fuel-quantity-indicating-system-no-2-tank-wiring-harness/documents"}}