{"id":"F2009L00053","name":"AD/CESSNA 185/50 - Alternate Static Air Source Selector Valve Placard","slug":"ad-cessna-185-50-alternate-static-air-source-selector-valve-placard","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76460,"registerId":"commonwealth-F2009L00053-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 185 Series Aeroplanes","sectionType":"division","heading":"Cessna 185 Series Aeroplanes","content":"### Cessna 185 Series Aeroplanes\n\n| AD/CESSNA 185/50 | Alternate Static Air SourceSelector Valve Placard | 3/2009 TX |\n| ---------------- | ------------------------------------------------- | --------- |\n\n```html\n

Applicability:

Aeroplane models listed in Table 1 of this AD, that:

1. Were initially delivered from the manufacturer between 1 January 1993, and
31 March 2008, unless the modification/rework required in AD/CESSNA 185/49 has been done and the aeroplane remains in compliance with that AD; or

2. Have a alternate static air selector valve part number (P/N) 2013142-18 installed as a replacement part anytime after 1 January 1993, unless the modification/rework required in AD/CESSNA 185/49 has been done and the aeroplane remains in compliance with that AD.

Table 1 - Aeroplanes that Could Have the Affected Part Installed

185

185B

185D

A185E

185A

185C

182E

A185F

Note 1: The affected part was shipped from Cessna Parts Distribution (CPD) between 1 January 1993 and 31 March 2008.

Note 2: P/N 2013142-18 replaced P/Ns 2013142-9, -13, and -17.

Requirement:

1. For all affected aeroplanes that are not equipped for flight under instrument flight rules (IFR) - Inspect the alternate static air source selector valve to assure that the part number identification placard is not obstructing the port.

2. For all affected aeroplanes that are equipped for flight under IFR:

a. Inspect the alternate static air source selector valve to assure that the part number identification placard is not obstructing the port; or

b. Fabricate a placard that incorporates the following words (using at least
1/8-inch letters) and install this placard on the instrument panel within the pilot’s clear view:

“IFR OPERATION IS PROHIBITED” and “USE OF THE ALTERNATE STATIC AIR SOURCE IS PROHIBITED.”

\n```\n\n| | 3. For all affected aeroplanes that are equipped for flight under IFR - If placards were installed in accordance with Requirement 2b of this AD, inspect the alternate static air source selector valve to assure that the part number identification placard is not obstructing the port.After doing the inspection, remove the placards installed in accordance with Requirement 2b of this AD before further flight.4. For all affected aeroplanes - If the alternate static air source selector valve port is found obstructed by the part number identification placard during the inspection detailed in Requirements 1, 2a, and 3 of this AD, remove the placard from the valve body, discard the placard, and assure that the port is open and unobstructed.5. For all affected aeroplanes - When a replacement valve is needed, only install a P/N 2013142-18 alternate static air source selector valve that has been inspected and the port is found free from obstruction.The procedures required to accomplish this AD are detailed in Cessna Single Engine Service Bulletin SB08-34-02, Revision 1, dated 6 October 2008; Cessna Caravan Service Bulletin CAB08-04, Revision 1, dated 6 October 2008; Cessna Single Engine Service Bulletin SEB08-5, dated 13 October 2008; or Cessna Multi-engine Service Bulletin MEB08-6, dated 13 October 2008, as applicable.Note 3: FAA AD 2008-26-10 Amdt 39-15776 dated 15 December 2008 refers. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Compliance: | For Requirement 1 - Within the next 100 hours time-in-service (TIS) after the effective date of this AD or within the next 4 months after the effective date of this AD, whichever occurs first.For Requirement 2a - Within the next 10 days after the effective date of this AD.For Requirement 2b - Before further flight after the effective date of this AD.For Requirement 3 - Within the next 100 hours TIS after the effective date of this AD or within the next 4 months after the effective date of this AD whichever occurs first.For Requirement 4 - Before further flight after the inspection required in Requirements 1, 2a, and 3 of this AD.For Requirement 5 - As of 10 days after the effective date of this AD. |\n| | This Airworthiness Directive becomes effective on 16 January 2009. |\n\n| Background: | Reports of improper installation of the part number (P/N) identification placard on P/N 2013142-18 alternate static air source selector valves prompted the issue of AD/CESSNA 185/49 in response to the United States Federal Aviation Administration (FAA) issuing AD 2008-10-02.Since then the FAA has received reports of 15 aeroplanes not previously affected by AD 2008-10-02 with a P/N 2013142-18 installed and the alternate static air source selector valve port was found obstructed by the P/N identification placard.The Civil Aviation Safety Authority (CASA) has no way of determining which aeroplanes have the remaining problem alternate static air source selector valve assemblies installed without having all of the affected aeroplanes and spares stock inspected.The FAA has been informed that all P/N 2013142-18 alternate static air source selector valves shipped from Cessna Parts Distribution between 1 January 1993, and 31 March 2008, may have port obstruction caused by the P/N identification placard.This condition, if not corrected, could result in the altimeter, airspeed, and vertical speed indicators displaying erroneous indications. This could cause the pilot to react to incorrect flight information and possibly result in loss of control. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n8 January 2009","sortOrder":0},{"sectionNumber":"AD/CESSNA 185/50","sectionType":"part","heading":"AD/CESSNA 185/50","content":"## AD/CESSNA 185/50","sortOrder":1},{"sectionNumber":"Alternate Static Air SourceSelector Valv","sectionType":"part","heading":"Alternate Static Air SourceSelector Valve Placard","content":"## Alternate Static Air Source \nSelector Valve Placard","sortOrder":2},{"sectionNumber":"3/2009 TX","sectionType":"part","heading":"3/2009 TX","content":"## 3/2009 TX","sortOrder":3}],"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"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"This AD broadened scope relative to the earlier action by explicitly covering alternate static selector valves P/N 2013142-18 shipped from Cessna Parts Distribution between 1 January 1993 and 31 March 2008 and any aircraft fitted with that P/N after 1 January 1993 (unless the AD/CESSNA 185/49 rework was done). The Background records that the FAA identified 15 additional aeroplanes not previously affected, and CASA therefore requires inspection of remaining fleet and spares stock."},"complexity_factors":["Conditional applicability across multiple airframe models and delivery/installation dates (Applicability).","Exemption where prior modification/rework under AD/CESSNA 185/49 has been completed, requiring cross-checking maintenance records (Applicability).","Different mandatory actions for IFR-equipped versus non-IFR aircraft (Requirements 1–2), including a choice between inspection and temporary operational limitation via placard.","Staged and varied compliance timeframes (100 flight hours, 10 days, before next flight, etc.) that operators must track (Compliance).","Technical nature of the inspection (confirming valve port unobstructed by a small placard) and potential need for part removal or replacement (Requirements 4–5).","Reference to multiple manufacturer service bulletins as the required procedures, adding dependency on external documents for exact steps (Requirements).","Operational effect (temporary prohibition of IFR use) imposed by a placard option, creating an immediate operational cost if chosen (Requirements 2b, 3)."],"plain_english_summary":"This AD requires operators of Cessna 185-series aeroplanes with alternate static selector valve P/N 2013142-18 (shipped 1 Jan 1993–31 Mar 2008 or installed later) to inspect the valve port for obstruction by the part-number placard, remove the placard if obstructing, and, for IFR-equipped aircraft, either inspect promptly or fit a temporary placard prohibiting IFR use. Replacement valves may be fitted only if inspected and unobstructed.\n\nCASA links the measure to reports that blocked ports can produce erroneous altitude, airspeed and vertical-speed indications; operators pay for inspections, removals, placarding and any replacements and must meet staged deadlines."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope addressing a specific safety defect in Cessna 185 series aircraft regarding alternate static air source selector valves. It does not expand beyond the original safety purpose of ensuring proper airflow to flight instruments."},"complexity_factors":["Multiple applicability conditions with date ranges and exceptions (unless clauses)","Different compliance timelines for different requirements (10 days vs 100 hours/4 months vs before further flight)","Bifurcated requirements based on IFR vs non-IFR equipment status","Cross-reference to previous AD (AD/CESSNA 185/49) for exemption determination","Multiple Cessna service bulletins referenced for procedures (SB08-34-02, CAB08-04, SEB08-5, MEB08-6)","Nested conditional logic: Requirement 3 only applies if Requirement 2b was used","Specific part number tracking (P/N 2013142-18) with replacement history","Reference to corresponding FAA AD (2008-26-10) for context"],"plain_english_summary":"This AD requires owners/operators of certain Cessna 185-series aeroplanes (delivered new 1 Jan 1993–31 Mar 2008, or with replacement valve P/N 2013142-18 installed after 1 Jan 1993) to inspect the alternate static air source selector valve for a part-number placard that may block the static port and cause incorrect altimeter/airspeed/vertical-speed indications. Blocked ports must have the placard removed. IFR aircraft face much shorter compliance times or must be placarded out of IFR use until inspected. This fixes a potential loss-of-control hazard."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-185-50-alternate-static-air-source-selector-valve-placard","history":"/api/acts/ad-cessna-185-50-alternate-static-air-source-selector-valve-placard/history","analysis":"/api/acts/ad-cessna-185-50-alternate-static-air-source-selector-valve-placard/analysis","conflicts":"/api/acts/ad-cessna-185-50-alternate-static-air-source-selector-valve-placard/conflicts","importantCases":"/api/acts/ad-cessna-185-50-alternate-static-air-source-selector-valve-placard/important-cases","documents":"/api/acts/ad-cessna-185-50-alternate-static-air-source-selector-valve-placard/documents"}}