{"id":"F2006B08130","name":"AD/CESSNA 303/3 - Exhaust Gas and Fuel Leakage in Engine Compartment","slug":"ad-cessna-303-3-exhaust-gas-and-fuel-leakage-in-engine-compartment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115262,"registerId":"commonwealth-F2006B08130-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 303/3 - Exhaust Gas and Fuel Leakage in Engine Compartment","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 T303 Series Aeroplanes\n\nAD/CESSNA 303/3 Exhaust Gas and Fuel Leakage\n\nin Engine Compartment\n\n  \n1/86 DM\n\nApplicability: Cessna model T303 with serial numbers T30300001 up to and including T30300315.\n\nDocument: FAA Emergency AD 85-23-06 priority letter issued 14 November 1985. Para (a) and (b).\n\nNote: Operators of affected A/C are requested to advise their local Department of Aviation Airworthiness Officers of the results of this inspection.\n\nCompliance: Unless already accomplished within 10 flying hours after 17 December 1985. Background: FAA AD 85-23-06 letter advises that the source of an engine compartment fire of a\n\nCessna T303 A/C under investigation may be attributed to leaking fuel metering unit\n\nfittings and exhaust gas leakage. This one time inspection is required to ensure integrity of the turbocharger exhaust system and fuel unit fittings.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument as presented does not change or expand scope beyond what it states: it applies to Cessna T303 serial numbers T30300001 through T30300315 and requires a one-time inspection within the specified timeframe. The text contains no indication that the applicability or required action was altered from an earlier instrument."},"complexity_factors":["Narrow applicability limited to a specific serial-number range (T30300001–T30300315) (Applicability)","Single, time-limited compliance action (one-time inspection within 10 flying hours after 17 December 1985) (Compliance)","Reference to an external FAA Emergency AD as the source of the requirement (Document)","Reporting request to local Department of Aviation Airworthiness Officers adds an administrative step (Note)","Lack of detail in the AD about who precisely performs the inspection or the steps to be taken if leaks are found increases potential operational ambiguity (Compliance; Background)"],"plain_english_summary":"This AD requires a one‑time engine‑compartment inspection on Cessna T303 serials T30300001–T30300315 to check for leaking fuel‑metering‑unit fittings and turbocharger exhaust leaks—risks linked to engine‑compartment fire. The inspection must be done within 10 flying hours after 17 Dec 1985 (unless already completed); operators bear costs, must fix any defects and are asked to report results. The AD implements an FAA Emergency AD."},"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 mandating a one-time inspection for exhaust and fuel leaks in a specific aircraft model."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term (Applicability range)","No cross-references to other legislation beyond citation of parent regulations (Civil Aviation Regulations 1998, Part 39)","Simple conditional logic: single compliance deadline with one exception clause ('Unless already accomplished')","Single purpose: one specific inspection task","No nested exceptions or sub-delegations"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice for aircraft owners and operators. It requires owners of specific Cessna T303 aeroplanes (serial numbers T30300001 through T30300315) to inspect their aircraft for two dangerous problems: **exhaust gas leaks** and **fuel leaks** in the engine compartment.\n\n**Why this matters:**\n- A Cessna T303 had an engine fire that investigators traced to leaking fuel fittings and exhaust gas leakage\n- These leaks can combine to create a serious fire hazard\n- The directive makes this inspection **legally mandatory**, not optional\n\n**What owners must do:**\n- Inspect the turbocharger exhaust system and fuel unit fittings for integrity\n- Complete this inspection within **10 flying hours** after 17 December 1985 (unless already done)\n- Report the results to their local Department of Aviation Airworthiness Officer\n\n**Who it affects:**\n- Owners and operators of Cessna T303 aircraft with serial numbers in the specified range\n- Maintenance organisations servicing these aircraft\n\nThis is a **one-time inspection** triggered by an emergency safety finding from the US Federal Aviation Administration (FAA)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-303-3-exhaust-gas-and-fuel-leakage-in-engine-compartment","history":"/api/acts/ad-cessna-303-3-exhaust-gas-and-fuel-leakage-in-engine-compartment/history","analysis":"/api/acts/ad-cessna-303-3-exhaust-gas-and-fuel-leakage-in-engine-compartment/analysis","conflicts":"/api/acts/ad-cessna-303-3-exhaust-gas-and-fuel-leakage-in-engine-compartment/conflicts","importantCases":"/api/acts/ad-cessna-303-3-exhaust-gas-and-fuel-leakage-in-engine-compartment/important-cases","documents":"/api/acts/ad-cessna-303-3-exhaust-gas-and-fuel-leakage-in-engine-compartment/documents"}}