{"id":"F2006B05089","name":"AD/CESSNA 180/76 - Alternate Static Source Valve Inspection","slug":"ad-cessna-180-76-alternate-static-source-valve-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45064,"registerId":"commonwealth-F2006B05089-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 180/76 - Alternate Static Source Valve 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)  \nCessna 180, 182 and Wren 460 Series Aeroplanes\n\nAD/CESSNA 180/76 Alternate Static Source Valve Inspection 4/98 DM\n\nApplicability: Model 182S aeroplanes with the following serial numbers:\n\n18280001, 18280002, 18280004 through 18280045 inclusive, 18280048 through\n\n18280060 inclusive, 18280062 through 18280064 inclusive and 18280067 through\n\n18280070 inclusive.\n\nRequirement: 1. Fabricate placards with the following words, using letters at least 3mm (1/8 inch) in height, and install these placards in the cockpit within the pilot’s clear view:\n\n    ‘IFR operation prohibited’\n\n    b. ‘Use of the alternate static air source is prohibited’\n\n    2. Inspect, in accordance with Cessna Single Engine Service Bulletin SB97-34-02 Revision 1 dated 22 December 1997, the alternate static air source valve to ensure that the static air source valve is not restricted by the identification placard and to ensure that the valve body does not separate from the valve flange.\n\n    3. If, as a result of the Requirement 2 inspection, the alternate static air source valve is found to be restricted by the identification placard, rework the alternate static air source assembly in accordance with SB97-34-02 Revision 1.\n\n    4. If, as a result of the Requirement 2 inspection, the valve body is found to separate from the valve flange, replace the alternate static air source assembly in accordance with the procedures contained in the aircraft maintenance manual.\n\nNote: FAA Priority Letter AD 98-01-01 Amdt 39-10287 refers.\n\nCompliance: 1. Prior to further flight after the effective date of this Directive.\n\n    2. Within 100 hours time in service (TIS) after the effective date of this Directive or 27 May 1998, whichever occurs first. Accomplishment of the Requirement 2 inspection is considered terminating action for the Requirement 1 placarding if no fault is found.\n\n    3. Prior to further flight after the Requirement 2 inspection. Rework of the alternate static air source assembly is considered terminating action for the Requirement 1 placarding.\n\n    4. Either:\n\n    Prior to further flight to eliminate the operating limitations imposed by the Requirement 1 placarding;\n\nor\n\n    b. Within the next 25 hours TIS after the Requirement 2 inspection provided the operating limits imposed by the Requirement 1 placarding are adhered to.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nThis airworthiness directive becomes effective on 18 February 1998.\n\nBackground: The FAA has received reports from Cessna about the improper installation of the identification placard on the alternate static source. The placard was installed on the valve body in a location that covers the external orifice, which is the inlet for static air reference into the valve. If these assemblies are not corrected selection of alternate static air source will cause the altimeter, airspeed and vertical speed indicators to display erroneous indications.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive targets a specific installation defect (misplaced placard blocking the static inlet) on identified serial-numbered aircraft. It prescribes corrective measures (placarding, inspection, rework or replacement) and time limits; it does not broaden the category of affected aircraft or expand regulatory authority beyond fixing that defect."},"complexity_factors":["Narrow applicability: only specific Cessna 182S serial numbers are affected, which limits scope but requires serial-number verification.","Mixed remedial options: placarding, inspection, rework or full replacement depending on inspection results.","Multiple and staggered compliance deadlines (prior-to-flight placarding, inspection within 100 hours or by a calendar date, 25-hour window for some corrective work).","Dependence on external technical documents: inspection and rework reference a Cessna service bulletin and the aircraft maintenance manual for procedures.","Operational impact: temporary operating limitation (no IFR / no alternate static source) until inspection/rework or replacement is done.","Maintenance burden falls on owners/operators and requires access to qualified maintenance personnel and parts for rework/replacement."],"plain_english_summary":"This airworthiness directive requires owners/operators of certain Cessna 182S aeroplanes to install cockpit placards prohibiting IFR and use of the alternate static air source, inspect the alternate static air-source valve for obstruction or separation, and rework or replace the assembly if faults are found.\n\nPilots and maintenance organisations decide compliance; aircraft owners pay for placards, inspections, and any rework or replacement. The measure targets a misinstalled placard that can block the static inlet and cause incorrect flight instrument readings."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific manufacturing defect in a limited production run of aircraft. The scope remains tightly focused on the identified safety issue without expansion into broader operational or regulatory matters."},"complexity_factors":["Multiple conditional compliance paths depending on inspection findings (Requirements 1-4 with interdependencies)","Cross-reference to external technical document (Cessna Service Bulletin SB97-34-02 Revision 1)","Specific serial number applicability with non-consecutive ranges (18280001, 18280002, 18280004-18280045, etc.)","Dual compliance timelines (100 hours TIS vs calendar date 27 May 1998)","Terminating action provisions that modify other requirements based on inspection outcomes","Reference to US FAA Airworthiness Directive (AD 98-01-01) for additional context"],"plain_english_summary":"This CASA safety order targets specific Cessna 182S aeroplanes with a manufacturing defect: an identification placard fitted over the alternate static source valve can block its inlet (or the valve body may separate), causing altimeter, airspeed and VSI errors. It requires immediate cockpit warnings, inspection per Cessna service guidance, and corrective work or replacement as needed. It matters because incorrect instrument readings in IMC/IFR can lead to fatal accidents."},"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-180-76-alternate-static-source-valve-inspection","history":"/api/acts/ad-cessna-180-76-alternate-static-source-valve-inspection/history","analysis":"/api/acts/ad-cessna-180-76-alternate-static-source-valve-inspection/analysis","conflicts":"/api/acts/ad-cessna-180-76-alternate-static-source-valve-inspection/conflicts","importantCases":"/api/acts/ad-cessna-180-76-alternate-static-source-valve-inspection/important-cases","documents":"/api/acts/ad-cessna-180-76-alternate-static-source-valve-inspection/documents"}}