{"id":"F2009L00054","name":"AD/CESSNA 206/66 - Alternate Static Air Source Selector Valve Placard","slug":"ad-cessna-206-66-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":76462,"registerId":"commonwealth-F2009L00054-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 206 Series Aeroplanes","sectionType":"division","heading":"Cessna 206 Series Aeroplanes","content":"### Cessna 206 Series Aeroplanes\n\n| AD/CESSNA 206/66 | 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 206/65 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 206/65 has been done and the aeroplane remains in compliance with that AD.

Table 1 - Aeroplanes that Could Have the Affected Part Installed

206

T206H

TU206C

U206C

206H

TP206A

TU206D

U206D

P206

TP206B

TU206E

U206E

P206A

TP206C

TU206F

U206F

P206B

TP206D

TU206G

U206G

P206C

TP206E

U206

P206D

TU206A

U206A

P206E

TU206B

U206B

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.

\n```\n\n| 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; orb. Fabricate a placard that incorporates the following words (using at least1/8-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.”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. |\n\n| | 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| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Airworthiness Directive becomes effective on 16 January 2009. |\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 206/65 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![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n8 January 2009","sortOrder":0},{"sectionNumber":"AD/CESSNA 206/66","sectionType":"part","heading":"AD/CESSNA 206/66","content":"## AD/CESSNA 206/66","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":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific manufacturing defect in a specific part (P/N 2013142-18) on specific Cessna 206 variants. While it references prior related directives and provides multiple compliance pathways, it does not expand beyond the original safety purpose of ensuring alternate static air source valves are unobstructed."},"complexity_factors":["Multiple conditional requirement pathways based on aircraft equipment (IFR vs non-IFR capability)","Cross-reference to prior directive AD/CESSNA 206/65 for exemption determination","Staggered compliance deadlines ranging from 10 days to 4 months depending on requirement and aircraft type","Requirement 3 creates a two-step process for IFR aircraft choosing the placard option (install, then later inspect and remove)","Nested applicability criteria combining manufacture dates, part numbers, and prior modification status","Reference to four separate Cessna service bulletins for procedural guidance","27 aircraft models listed in tabular format creating fragmented applicability"],"plain_english_summary":"This AD requires owners/operators of specific Cessna 206 series aircraft to inspect the alternate static air source selector valve because a misapplied part-number label can block a port and produce false altitude/airspeed instrument readings. If a blockage is found, remove the label and clear or replace the valve before flight. IFR-capable aircraft face stricter, faster compliance and may temporarily be placarded to prohibit IFR use until inspected."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"This AD broadens the cohort affected relative to the earlier AD/CESSNA 206/65 by capturing: (a) aeroplanes delivered between 1 January 1993 and 31 March 2008 that may have received the affected valve from Cessna Parts Distribution during that period; and (b) aeroplanes that had P/N 2013142-18 installed as a replacement part at any time after 1 January 1993. It therefore extends the compliance universe beyond the initially-reported subset of airplanes by addressing valves shipped over a long date range and valves installed as replacements. The AD also adds operational controls for IFR-equipped aircraft (temporary placarding that prohibits IFR and use of the alternate static source until inspection), and imposes a requirement that replacement valves be inspected before installation. These elements expand the practical scope from correcting a discrete installation problem to covering installed spares, replacement installations, and temporary operational restrictions for IFR aircraft."},"complexity_factors":["Applicability uses conditional language based on delivery date (1 Jan 1993 – 31 Mar 2008) and on whether earlier AD/CESSNA 206/65 modification has been done (nested exception).","Table 1 lists 29 distinct Cessna 206-series model variants, expanding scope of potential applicability.","Multiple, distinct requirements (1–5) with different actions depending on whether aircraft are IFR-equipped or not (branching logic).","Several different compliance timeframes: 10 days, before further flight, within 100 hours TIS or 4 months (whichever first), and 'as of' dates for replacement parts.","Cross-references to multiple Cessna Service Bulletins for the detailed procedures (external normative documents) and to an earlier AD (AD/CESSNA 206/65) and FAA AD (2008-26-10).","Multiple part-number considerations: affected P/N 2013142-18 and note that it replaced earlier P/Ns (-9, -13, -17), plus requirement that replacement valves be inspected before installation.","Operational conditionality for temporary measures (fabricated placard) that must later be removed if inspection shows the port unobstructed (temporary->permanent workflow)."],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Requires inspection of the alternate static air source selector valve (part number P/N 2013142-18) on certain Cessna 206-series aeroplanes to make sure the factory part-number identification placard is not blocking the selector valve port. (See \"Requirements 1, 2a, 3, 4, 5\")\n- If the placard is blocking the port, the placard must be removed and discarded and the port confirmed open before further flight. (Requirement 4)\n- For aeroplanes certificated for IFR flight, if an immediate permanent fix cannot be done, operators must either inspect and verify the placard does not obstruct the port (Requirement 2a) or install a temporary instrument-panel placard in the pilot's clear view that says, in at least 1/8-inch letters: \"IFR OPERATION IS PROHIBITED\" and \"USE OF THE ALTERNATE STATIC AIR SOURCE IS PROHIBITED\" (Requirement 2b). If the temporary placard is used, the valve must then be inspected and the temporary placard removed before further flight. (Requirement 3)\n- When replacing a selector valve after the specified date, only install a P/N 2013142-18 valve that has been inspected and found free from placard obstruction. (Requirement 5)\n- The mandated inspection and corrective procedures are to be carried out in accordance with the listed Cessna Service Bulletins (see the AD for exact bulletin references).\n\n**Who this affects\n\n- Owners/operators and maintainers of Cessna 206-series aeroplanes listed in Table 1 of the AD (29 model variants listed), where either:\n - the aeroplane was originally delivered from the manufacturer between 1 January 1993 and 31 March 2008 (unless the aircraft already had the modification/rework required by AD/CESSNA 206/65 and remains in compliance with that AD); or\n - a P/N 2013142-18 alternate static selector valve was fitted as a replacement part at any time after 1 January 1993 (again, unless AD/CESSNA 206/65 modification has been done and remains in effect). (Applicability)\n- Maintenance organisations and technicians who inspect, remove, or replace the selector valve or fabricate/install temporary placards.\n\n**Why it matters (stated safety problem and effect)\n\n- The background to the AD reports that the part-number identification placard on some P/N 2013142-18 selector valves can be installed incorrectly and obstruct the valve port.\n- An obstructed alternate-static port can give erroneous pressure inputs to the altimeter, airspeed indicator and vertical speed indicator. These faulty instrument readings could lead a pilot to make incorrect control inputs and increase the risk of loss of control. (Background)\n\n**Timing and practical mechanics of compliance (high level)\n\n- Non-IFR-equipped aeroplanes: inspect the valve within 100 flight hours or within 4 months of the AD becoming effective, whichever is sooner. (Requirement 1 & Compliance)\n- IFR-equipped aeroplanes: either inspect within 10 days (Requirement 2a) or install the temporary placard immediately and do the inspection before the next flight (Requirement 2b). If the temporary placard was used, the valve must be inspected within 100 flight hours or 4 months and the temporary placard removed before further flight. (Requirements 2a, 2b, 3 & Compliance)\n- If the inspection finds the placard obstructing the port, remove and discard the placard and ensure the port is clear before further flight. (Requirement 4)\n- From 10 days after the effective date, only install replacement P/N 2013142-18 valves that have been inspected and found unobstructed. (Requirement 5 & Compliance)\n- The AD points to specific Cessna Service Bulletins for the detailed inspection and corrective procedures.\n\n**Implementation, costs and who decides and pays\n\n- Who decides: aircraft operators must determine applicability for each aeroplane (check delivery dates and installed part numbers) and maintenance staff must perform the inspections and corrective work according to the AD and the referenced service bulletins.\n- Who pays: the aircraft owner/operator pays for inspection labour, any downtime, fabrication/installation of temporary placards (if used), and any replacement valve labour or parts if a replacement is needed.\n- Compliance burden: inspection is a short maintenance task but requires locating and verifying the part number/placard and confirming the port is unobstructed. Identifying affected aeroplanes may require record checks (delivery dates, maintenance logs and part-number records) and inspecting spares inventory where replacements were stored.\n\n**Trade-offs, risks, and practical notes\n\n- Safety effect claimed: the AD is explicitly intended to eliminate a possible source of instrument error (the obstructed port). That is a direct safety mechanism (Background).\n- Opportunity cost and downtime: operators must schedule inspections and possible corrective work; small operators may face short-term downtime costs.\n- Enforcement and verification: CASA (the regulator) issues the AD; the aircraft owner/operator must document compliance in maintenance records. The AD cross-references earlier AD/CESSNA 206/65 — if that modification is already done and still in compliance, the aircraft is excluded from this AD.\n- Parts-market effect: from 10 days after the AD, only valves of the affected part number that have been inspected and found unobstructed may be installed, which forces either inspection of stock or use of alternate parts that meet the required condition. This raises the administrative cost of installing replacement valves.\n\n**Source mechanics referenced**\n- Applicability, Requirements 1–5, Compliance timing, and Background are the operative sections quoted in the AD. The AD also references specific Cessna Service Bulletins for detailed procedures and refers to FAA AD 2008-26-10 as background.\n\n(End of summary.)"},"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-206-66-alternate-static-air-source-selector-valve-placard","history":"/api/acts/ad-cessna-206-66-alternate-static-air-source-selector-valve-placard/history","analysis":"/api/acts/ad-cessna-206-66-alternate-static-air-source-selector-valve-placard/analysis","conflicts":"/api/acts/ad-cessna-206-66-alternate-static-air-source-selector-valve-placard/conflicts","importantCases":"/api/acts/ad-cessna-206-66-alternate-static-air-source-selector-valve-placard/important-cases","documents":"/api/acts/ad-cessna-206-66-alternate-static-air-source-selector-valve-placard/documents"}}