{"id":"F2006B08136","name":"AD/CESSNA 303/9 Amdt 1 - Slick Pressurized Magnetos - Flight Manual","slug":"ad-cessna-303-9-amdt-1-slick-pressurized-magnetos-flight-manual","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115279,"registerId":"commonwealth-F2006B08136-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 303/9 Amdt 1 - Slick Pressurized Magnetos - Flight Manual","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 303/9\n\nAmdt 1\n\n  \nSlick Pressurized Magnetos \\- Flight Manual 2/90\n\nApplicability: All Cessna T303 aircraft fitted with Slick Pressurized Magnetos model 6220 or 6224\\. Requirement: 1. Revise the AFM by adding the following:\n\nBEFORE TAKEOFF\n\nPerform a magneto check of each engine at 1,700 RPM as follows: Move ignition switch first to R position and note RPM. Next, move switch back to BOTH, to clear the other set of plugs. Then, move switch to the L position, note RPM and return the switch to the BOTH position. RPM drop should not exceed 150 RPM on either magneto or show greater than 50 RPM differential between magnetos. If there is doubt concerning operation of the ignition system, RPM checks at higher engine speed will usually confirm whether a deficiency exists.\n\nIf the magneto check exceeds either of the above limits, both magnetos must be disassembled and inspected in accordance with Requirement 2 of AD/CESSNA 303/8; an entry to this affect is to be made in the Maintenance Release by the pilot.\n\nNote 1: The aforementioned amendment may be accomplished by inserting a copy of this AD into the relevant section of the AFM.\n\nNote 2: AD/CESSNA 303/8, FAA AD-25-04, and Teledyne Continental Service Bulletin M88-14 also refer.\n\nCompliance: Within 100 hours time in service after 20 April 1989 and concurrent with AD/CESSNA 303/8.\n\nBackground: The Before Take Off check introduced by this AD requires that any magneto which exceeds the limits specified in the check must be placed unserviceable in the maintenance release by the pilot and subsequently disassembled and inspected in accordance with AD/CESSNA 303/8.\n\nAmendment 1 to this Directive is issued to correct certain documentation references only, and requires no additional work by operators.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 corrects documentation references only and does not change operative requirements, affected aircraft, or required actions. The Directive still requires AFM insertion of the before‑takeoff check, pilot performance and maintenance recording of failures, and disassembly/inspection in accordance with AD/CESSNA 303/8 (Amendment 1; Requirement; Background)."},"complexity_factors":["Cross‑references to other directives and documents (AD/CESSNA 303/8, FAA AD‑25‑04, Teledyne Continental SB M88‑14) increasing dependency on external texts (Requirement; Note 2).","Technical thresholds and test procedure (1,700 RPM, ≤150 RPM drop, ≤50 RPM differential) require operator adherence to precise measurements (Requirement).","Pilot judgment permitted where doubt exists (option to recheck at higher engine speed), creating limited discretionary decision‑making (Requirement).","Follow‑on maintenance mandate (disassembly and inspection per Requirement 2 of AD/CESSNA 303/8) ties compliance to another mandatory maintenance process (Requirement; Background).","Compliance timing tie‑in (within 100 hours TIS after 20 April 1989 and concurrent with AD/CESSNA 303/8) creates scheduling constraints (Compliance).","Narrow applicability to specific aircraft and magneto models but mandatory for those affected (Applicability)."],"plain_english_summary":"Requires owners/operators of Cessna T303 aeroplanes fitted with Slick pressurised magnetos (models 6220 or 6224) to add a before‑takeoff magneto check to the Aircraft Flight Manual: at 1,700 RPM check each magneto, the RPM drop must not exceed 150 or show greater than 50 RPM differential, and failures must be made unserviceable and inspected per AD/CESSNA 303/8. Pilots perform and record the check; operators bear the time and potential maintenance costs. Amendment 1 corrects documentation references only and imposes no extra work."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 1, which explicitly states it only corrects documentation references and requires no additional work. The original scope (mandatory pre-takeoff magneto check for Cessna T303 aircraft) remains unchanged."},"complexity_factors":["Short, single-purpose directive (approximately 300 words)","Only 2 defined technical terms requiring external knowledge (AFM, Maintenance Release)","Simple conditional logic: single test with two numeric thresholds (150 RPM drop, 50 RPM differential)","Cross-references to 3 external documents (AD/CESSNA 303/8, FAA AD-25-04, Teledyne Continental Service Bulletin M88-14)","No nested exceptions or layered definitions","Clear applicability statement limiting scope to specific aircraft and magneto models"],"plain_english_summary":"Owners and operators of Cessna T303 aircraft fitted with Slick pressurized magnetos (models 6220/6224) must update the Aircraft Flight Manual to require a pre‑takeoff ignition check at 1,700 RPM. If the RPM drop or magneto difference exceeds limits, the aircraft is grounded and the magnetos must be inspected per AD/CESSNA 303/8. The AD prevents in‑flight engine failure; the amendment only corrects paperwork references."},"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-cessna-303-9-amdt-1-slick-pressurized-magnetos-flight-manual","history":"/api/acts/ad-cessna-303-9-amdt-1-slick-pressurized-magnetos-flight-manual/history","analysis":"/api/acts/ad-cessna-303-9-amdt-1-slick-pressurized-magnetos-flight-manual/analysis","conflicts":"/api/acts/ad-cessna-303-9-amdt-1-slick-pressurized-magnetos-flight-manual/conflicts","importantCases":"/api/acts/ad-cessna-303-9-amdt-1-slick-pressurized-magnetos-flight-manual/important-cases","documents":"/api/acts/ad-cessna-303-9-amdt-1-slick-pressurized-magnetos-flight-manual/documents"}}