{"id":"F2006B08335","name":"AD/CESSNA 400/49 Amdt 2 - Pilot and Co-Pilot Windshield Attach Hole - Inspection and Modification","slug":"ad-cessna-400-49-amdt-2-pilot-and-co-pilot-windshield-attach-hole-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115742,"registerId":"commonwealth-F2006B08335-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/49 Amdt 2 - Pilot and Co-Pilot Windshield Attach Hole - Inspection and Modification","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 400 Series Aeroplanes\n\nAD/CESSNA 400/49\n\nAmdt 2\n\n  \n\nPilot and Co-Pilot Windshield Attach Hole - Inspection and Modification\n\n  \n2/84\n\nApplicability: 1. All models 1978 thru 1982 414 and 1977 thru 1982 421 aircraft with S/Nos 414A0001 thru 414A0833, 414A0835 thru 414A0851, 414A0853 thru 414A0856,\n\n414A0858 and 421C0273 thru 421C1257.\n\n2. All models 425 with S/Nos 425-0002 thru 425-0177.\n\nNote: This inspection is only applicable to aircraft with factory installed windshields.\n\nDocument: 1. Cessna S.L. ME77-5\n\n    2. Cessna S.L. ME83-33 REV 1\n\n    3. Cessna S.L. PJ83-18 REV 1\n\nCompliance: Unless already accomplished, within 50 hours time in service after 17 February 1984.\n\nUntil compliance is accomplished, all flight operations are restricted to a maximum cabin differential pressure of 3.0 P.S.1.\n\nBackground: This Directive is raised in issue to reflect revised aircraft applicability and compliance requirements.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing directive. The background explicitly states it was revised to update 'aircraft applicability and compliance requirements' — this is a refinement of scope rather than expansion beyond original purpose. The core safety issue (windshield attachment integrity) remains unchanged from the original directive."},"complexity_factors":["Short, single-purpose directive (approximately 200 words)","Limited to specific aircraft models and serial number ranges (4 distinct groups)","Simple conditional logic: applies only to factory-installed windshields","Single compliance deadline with one interim operational restriction","No nested definitions or cross-references to other legislation beyond three cited service letters","Clear, unambiguous applicability section"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain Cessna 400-series twin-engine aircraft (models 414, 421, and 425 from the late 1970s to early 1980s) to inspect and modify the attachment holes for the pilot and co-pilot windshields.\n\n**Why it matters:**\nFaulty windshield attachment holes could cause the windshield to fail — potentially leading to rapid decompression at altitude or loss of the windshield entirely. Until the fix is done, pilots must fly with reduced cabin pressure (3.0 PSI maximum) to reduce stress on the windshield.\n\n**Who must comply:**\n- Cessna 414 and 421 aircraft built 1977–1982 with specific serial numbers\n- Cessna 425 aircraft with serial numbers 425-0002 through 425-0177\n- Only applies if the aircraft still has its original factory-installed windshield\n\n**Deadline:**\nWithin 50 flight hours after 17 February 1984 (unless already done).\n\n**The technical details:**\nThe directive references three Cessna Service Letters (technical bulletins) that spell out exactly how to do the inspection and modification."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The Background states the Directive was issued to reflect revised aircraft applicability and compliance requirements, so the scope was changed to alter which serial numbers and compliance timing apply."},"complexity_factors":["Serial-number and model-specific applicability across multiple model ranges (Applicability)","Requirement limited to factory-installed windshields only (Note)","Mandated use of three specific Cessna service letters for inspection/modification (Document)","Short compulsory compliance window: within 50 hours time-in-service after 17 February 1984 (Compliance)","Interim operational restriction to a maximum cabin differential pressure of 3.0 P.S.I. until compliance (Compliance)","Amendment/background indicating revised applicability and compliance requirements (Background)","Regulatory origin and enforcement under Civil Aviation Safety Authority, Part 39 (header)"],"plain_english_summary":"Requires inspection and modification of the pilot and co‑pilot windshield attach holes on specified Cessna 400/414/421/425 serial numbers, using the listed Cessna service letters. Applies only to aircraft with factory‑installed windshields.\n\nOwners/operators must complete the work within 50 flight hours after 17 February 1984; until then cabin differential pressure is limited to 3.0 psi. The Civil Aviation Safety Authority issues the requirement; operators bear the cost and operational limits."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-49-amdt-2-pilot-and-co-pilot-windshield-attach-hole-inspection-and-modification","history":"/api/acts/ad-cessna-400-49-amdt-2-pilot-and-co-pilot-windshield-attach-hole-inspection-and-modification/history","analysis":"/api/acts/ad-cessna-400-49-amdt-2-pilot-and-co-pilot-windshield-attach-hole-inspection-and-modification/analysis","conflicts":"/api/acts/ad-cessna-400-49-amdt-2-pilot-and-co-pilot-windshield-attach-hole-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-cessna-400-49-amdt-2-pilot-and-co-pilot-windshield-attach-hole-inspection-and-modification/important-cases","documents":"/api/acts/ad-cessna-400-49-amdt-2-pilot-and-co-pilot-windshield-attach-hole-inspection-and-modification/documents"}}