{"id":"F2006B07482","name":"AD/TSA-600/16 Amdt 1 - Fuel Quantity Indicator Selector Switch - Inspection","slug":"ad-tsa-600-16-amdt-1-fuel-quantity-indicator-selector-switch-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49912,"registerId":"commonwealth-F2006B07482-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TSA-600/16 Amdt 1 - Fuel Quantity Indicator Selector Switch - Inspection","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)  \nAerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\nAD/TSA-600/16\n\nAmdt 1\n\n  \n\nFuel Quantity Indicator Selector Switch - Inspection\n\n  \n12/78\n\nApplicability: All models with airframe S/Nos. 0150 to 0520\\. Requirement: 1. FAA AD 78-18-05 amdt. 39-3295; or\n\n    2. Piper Aerostar Bulletin SB600-76; or\n\n    3. With LH and RH wing tanks at least 50% depleted from tank capacity:\n\n    (a) Read and record fuel quantity indication for LH and RH wing fuel tanks.\n\n    (b) Add 10 gallons of fuel to one wing tank only.\n\n    (c) Read and record fuel quantity for each wing tank.\n\n    (d) Determine that the added fuel registers on the correct wing tank fuel quantity indicator selector position.\n\n    (e) If the correct wing tank fuel quantity selector position registers the added fuel, the system is normal and no further action is required under this AD.\n\n    4. If the appropriate wing tank fuel indicator position does not correctly register the added fuel the system may be improperly wired or the selector may be improperly indexed. In this event, prior to further flight correct the fuel quantity indicating system.\n\nCompliance: Within 25 hours time in service after 7 August 1978.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a narrow, technical airworthiness directive focused on a specific safety defect in a specific aircraft type. It has not expanded beyond its original purpose of ensuring fuel quantity indicator accuracy. The amendment (Amdt 1) appears to be a routine update rather than a scope expansion."},"complexity_factors":["Short, single-purpose directive focused on one mechanical issue","Only 3 compliance pathways, with one being a simple 5-step test procedure","Limited applicability (specific aircraft serial number range only)","No nested definitions or extensive cross-referencing — only references to one FAA AD and one manufacturer bulletin","Clear conditional logic (if test passes, no action; if fails, fix before flight)","Single compliance deadline with straightforward calculation (25 hours after fixed date)"],"plain_english_summary":"This CASA Airworthiness Directive (historical, issued 1978, Amdt 1) requires inspections/tests of the fuel quantity indicator selector switch on Aerostar 600/700 series aircraft (S/N 0150–0520) because wrong wiring/indexing can make pilots misread wing fuel. Operators could comply via the FAA AD, the manufacturer’s service bulletin, or a prescribed fuel test; defects must be corrected before flight. Deadline was 25 flight hours after 7 Aug 1978."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This instrument is labelled 'Amdt 1', indicating it amends an earlier AD. It defines the affected fleet (S/Ns 0150–0520), prescribes three compliance options (FAA AD, Piper SB, or the specified fuel-add test), and imposes a 25-hour compliance deadline; as an amendment it therefore modifies the prior AD's scope or instructions by specifying these requirements."},"complexity_factors":["Narrow applicability by serial number range (Applicability: S/Nos. 0150–0520) creates targeted but non-universal coverage.","Multiple compliance pathways: operator may follow FAA AD, Piper SB, or the specific on-aircraft test (Requirement: 1–3), increasing procedural choice and cross-referencing external documents.","Operational test requires fuel handling and in-service aircraft time (Requirement 3a–3e), so practical logistics and minor flight-fuel management are involved.","Safety-critical corrective obligation: any mismatch requires rectification prior to further flight (Requirement 4), imposing immediate maintenance action and possible wiring/indexing repairs.","Short statutory compliance window (Compliance: within 25 hours TIS after 7 August 1978) concentrates scheduling and potential grounding costs."],"plain_english_summary":"This airworthiness directive requires owners/operators of Aerostar (Piper/Ted Smith) 600 and 700 series aeroplanes (airframe S/Ns 0150–0520) to verify that the fuel quantity indicator selector switch correctly shows added fuel. Compliance can be by following the cited FAA AD or Piper service bulletin, or by performing the on-wing check (add 10 gallons to one tank and confirm the correct indicator moves); any incorrect indication must be corrected before further flight (Compliance: within 25 hours after 7 August 1978)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-16-amdt-1-fuel-quantity-indicator-selector-switch-inspection","history":"/api/acts/ad-tsa-600-16-amdt-1-fuel-quantity-indicator-selector-switch-inspection/history","analysis":"/api/acts/ad-tsa-600-16-amdt-1-fuel-quantity-indicator-selector-switch-inspection/analysis","conflicts":"/api/acts/ad-tsa-600-16-amdt-1-fuel-quantity-indicator-selector-switch-inspection/conflicts","importantCases":"/api/acts/ad-tsa-600-16-amdt-1-fuel-quantity-indicator-selector-switch-inspection/important-cases","documents":"/api/acts/ad-tsa-600-16-amdt-1-fuel-quantity-indicator-selector-switch-inspection/documents"}}