{"id":"F2006B04913","name":"AD/CESSNA 150/14 Amdt 1 - Pneumatic Stall Warning System","slug":"ad-cessna-150-14-amdt-1-pneumatic-stall-warning-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44757,"registerId":"commonwealth-F2006B04913-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 150/14 Amdt 1 - Pneumatic Stall Warning System","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 150, F150, 152 & F152 Series Aeroplanes\n\nAD/CESSNA 150/14\n\nAmdt 1\n\n  \nPneumatic Stall Warning System 6/83\n\nApplicability: All models with pneumatic stall warning systems not incorporating horn reed assembly P/N 0413483-2, P/N 0713348-1 or subsequent and protective screens over the horn bell and stall warning system opening on the left wing.\n\nRequirement: 1. Check the pneumatic stall warning system for correct operation by applying a slight suction with the mouth at the stall warning opening in the left wing. A properly functioning horn will provide a sound that is clearly audible. It may be advisable to first cover the opening with a clean piece of cloth. Cessna 100 Series Service Manual 1963 to 1967 Section 16 refers.\n\nNote: This check may be performed and certified by the pilot.\n\n    2. Install the following placard in full view of the pilot:\n\n“PRE-FLIGHT TEST THE PNEUMATIC STALL WARNING SYSTEM”.\n\n    3. The requirements of paragraphs 1 and 2 may be removed by incorporation of the following modifications. Replace the stall warning reed assembly P/N 0413028-1 with reed assembly P/N 0413483-2, P/N 0713348-1 or subsequent and install an 18 x 14 or 18 x 16 mesh screen over the exposed horn bell inside the cabin and over the left wing opening. Flight test the aircraft to assure the stall warning horn sounds at 5 to 10 knots above the stalling speed.\n\nCompliance: For para. 1 \\- Before each flight.\n\nFor para. 2 \\- Within 25 hours time in service after 5 September 1968.\n\nBackground: This amendment reflects latest Cessna Part Number change.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive maintaining its original purpose — mandating safety checks for a specific aircraft system. The amendment simply updates a part number reference (reed assembly) to reflect manufacturer changes, without expanding scope."},"complexity_factors":["Single, specific aircraft type (Cessna 150/152 series)","Only 3 requirements with clear compliance deadlines","Minimal defined terms (only part numbers referenced)","No cross-references to other legislation beyond a service manual citation","Simple conditional logic: basic requirements OR optional modification to remove requirements","Very short document (approximately 200 words)"],"plain_english_summary":"This CASA airworthiness directive requires owners/operators of Cessna 150/F150/152/F152 aircraft to address a risk that insects or debris can block the pneumatic stall‑warning intake, causing the horn to fail. Operators must verify stall‑warning operation before flight (by sucking or using a cloth), fit a cockpit placard within 25 flight hours, or install an improved reed and protective screens as a permanent fix. It prevents undetected slow‑flight stalls during critical phases."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The amendment updates Cessna part numbers and provides an alternative compliance route (install new reed assembly and mesh screens plus flight test) but does not broaden the AD’s safety objective or extend applicability beyond the same models with the specified pneumatic stall‑warning configuration. The core requirement—to ensure the stall‑warning horn functions—is unchanged (see amendment note: reflects latest Cessna Part Number change)."},"complexity_factors":["Narrow, specific applicability to Cessna 150/F150/152/F152 models with pneumatic stall warning systems lacking certain reed assembly part numbers or protective screens.","Two compliance paths: recurring pilot pre‑flight test plus placard, or one‑off modification (parts + flight test) that removes recurring checks.","Use of precise part numbers (P/N 0413483-2, P/N 0713348-1, etc.) creates a supply/installation verification requirement for maintenance.","Pilot may perform and certify the pre‑flight check, reducing need for licensed maintenance for the recurring action but shifting responsibility to operators/pilots.","Short compliance deadline for placard installation (within 25 hours TIS after specified date) and a continuous before‑each‑flight requirement for the test."],"plain_english_summary":"This airworthiness directive requires operators of Cessna 150/152-series aeroplanes with pneumatic stall‑warning systems (where the horn reed assembly or protective screens are not the listed part numbers) to perform a simple pre‑flight suction test at the left‑wing stall‑warning opening before each flight and to fit a cockpit placard reading “PRE-FLIGHT TEST THE PNEUMATIC STALL WARNING SYSTEM.” Pilots may perform and certify the check. Alternatively, owners can install updated reed assemblies and mesh screens and perform a flight test to remove the recurring checks. The amendment updates Cessna part numbers and gives a one‑off modification option in place of ongoing preflight checks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-150-14-amdt-1-pneumatic-stall-warning-system","history":"/api/acts/ad-cessna-150-14-amdt-1-pneumatic-stall-warning-system/history","analysis":"/api/acts/ad-cessna-150-14-amdt-1-pneumatic-stall-warning-system/analysis","conflicts":"/api/acts/ad-cessna-150-14-amdt-1-pneumatic-stall-warning-system/conflicts","importantCases":"/api/acts/ad-cessna-150-14-amdt-1-pneumatic-stall-warning-system/important-cases","documents":"/api/acts/ad-cessna-150-14-amdt-1-pneumatic-stall-warning-system/documents"}}