{"id":"F2009L00056","name":"AD/CESSNA 208/24 - Alternate Static Air Source Selector Valve Placard","slug":"ad-cessna-208-24-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":76466,"registerId":"commonwealth-F2009L00056-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 208 Series Aeroplanes","sectionType":"division","heading":"Cessna 208 Series Aeroplanes","content":"### Cessna 208 Series Aeroplanes\n\n| AD/CESSNA 208/24 | 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 208/22 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 208/22 has been done and the aeroplane remains in compliance with that AD.

Table 1 - Aeroplanes that Could Have the Affected Part Installed

208

208B

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 208/22 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 208/24","sectionType":"part","heading":"AD/CESSNA 208/24","content":"## AD/CESSNA 208/24","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":"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD expands the remedial scope beyond the earlier AD (AD/CESSNA 208/22) by explicitly capturing additional aeroplanes and spare parts: it applies to aeroplanes delivered between 1 January 1993 and 31 March 2008 (unless already modified under AD/CESSNA 208/22) and to any aircraft that had P/N 2013142-18 fitted after 1 January 1993. It also adds operational controls for IFR-equipped aeroplanes (temporary IFR-prohibition placards as an interim option) and places a pre-installation inspection requirement on replacement P/N 2013142-18 valves. In short, the instrument broadens affected population (including spares stock) and tightens downstream installation and operational rules compared with the earlier action."},"complexity_factors":["Conditional applicability based on delivery dates (1 Jan 1993 to 31 Mar 2008) with an exception if AD/CESSNA 208/22 has been complied with","Applicability also triggered by installation of a specific part number (P/N 2013142-18) at any time after 1 Jan 1993","Multiple alternative compliance paths for IFR-equipped aeroplanes (inspect within 10 days OR install temporary IFR-prohibition placard)","Five separate numbered requirements with differing compliance time windows (100 hours TIS or 4 months; 10 days; before further flight; etc.)","Cross-references to an earlier AD (AD/CESSNA 208/22), FAA ADs, and several Cessna service bulletins for procedural detail","Notes on part-number history (P/N 2013142-18 replaced earlier P/Ns), which affects identification of affected parts","Operational sequencing obligations (temporary placards to be removed after inspection; only inspected replacement parts may be installed)"],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Requires inspection and, where necessary, removal of a part-number (P/N) identification placard on the alternate static air source selector valve fitted to certain Cessna 208 and 208B aeroplanes. The placard, as fitted on some valves P/N 2013142-18, can block the valve port.\n\n- For aeroplanes equipped for IFR (instrument flight rules) the AD gives two immediate choices: either inspect the valve right away to confirm the placard is not blocking the port (Requirement 2a), or install a clear instrument-panel placard 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).\n\n- After the required inspections, any temporary instrument-panel placards installed under Requirement 2b must be removed before further flight (Requirement 3).\n\n- If inspection finds the part-number placard obstructing the valve port, the valve placard must be removed and discarded, and the port confirmed open before next flight (Requirement 4).\n\n- Replacement valves (P/N 2013142-18) may only be installed if they have been inspected and found free of obstruction (Requirement 5).\n\n- The AD points operators to Cessna service bulletins for the detailed inspection and removal procedures and sets different compliance time windows for each requirement (see \"Timing\").\n\nWho is affected\n\n- Owners/operators and maintenance organisations for Cessna 208 and 208B aeroplanes that: (a) were initially delivered from the manufacturer between 1 January 1993 and 31 March 2008 (unless the modification required by the earlier AD/CESSNA 208/22 has already been performed and remains effective); or (b) have had a replacement alternate static air source selector valve P/N 2013142-18 installed any time after 1 January 1993 (again unless AD/CESSNA 208/22 was done and remains effective). See \"Applicability\".\n\n- Parts suppliers and maintainers who stock and install P/N 2013142-18 valves, because replacements must be inspected before installation.\n\nWhy it matters (claimed safety risk, and testing that claim)\n\n- The background states the FAA and CASA received reports that the P/N identification placard was improperly installed and could obstruct the alternate static air source selector valve port. If the port is obstructed, the static source can be compromised and the altimeter, airspeed indicator and vertical speed indicator may display incorrect information. The AD identifies the risk of pilot reaction to incorrect instruments and the consequent potential for loss of control.\n\n- Testing the claim against costs and trade-offs: the remedy is inspection and, where needed, removal of a small placard or temporary installation of a cockpit placard prohibiting IFR use of the alternate static. This is a low-technology, low-material-cost fix but does impose time and operational constraints (see \"Who pays / who decides\").\n\nTiming / compliance windows (summary)\n\n- Non-IFR aeroplanes: inspect the valve within 100 hours TIS or within 4 months after the AD takes effect, whichever is earlier (Requirement 1).\n\n- IFR aeroplanes: either inspect within 10 days (Requirement 2a) or install the temporary instrument-panel prohibition placard before the next flight (Requirement 2b). After the inspection required later, remove the temporary placard before further flight (Requirement 3).\n\n- If obstruction is found, remove the obstructing placard and ensure the port is open before further flight (Requirement 4).\n\n- From 10 days after the AD takes effect, any replacement P/N 2013142-18 valve must be inspected and found unobstructed prior to installation (Requirement 5).\n\nProcedural detail and references\n\n- The AD delegates the exact inspection and removal steps to Cessna service bulletins (single‑engine and multi‑engine/Caravan as applicable). It also cross-references an earlier AD (AD/CESSNA 208/22) and the FAA ADs that prompted this action.\n\nWho pays, who decides, and what behaviour changes\n\n- Who pays: aircraft owners/operators pay for inspections, any labour to remove placards or replace valves, and potential downtime. Parts suppliers may incur additional handling/inspection costs to ensure replacement valves are inspected prior to installation.\n\n- Who decides: aircraft operators decide whether to perform the inspection immediately or (for IFR aircraft) temporarily ground IFR operation by fitting the instrument-panel placard. CASA (through the AD) enforces compliance; maintenance organisations implement the inspections per Cessna service bulletins.\n\n- Behavioural change: operators must inspect existing valves and stop fitting uninspected P/N 2013142-18 valves; IFR-equipped aeroplanes must either be inspected quickly or be restricted from IFR use until the issue is resolved.\n\nCompliance burden, implementation risk, and likely operational effects\n\n- Compliance burden: mostly inspection labour and short-term operational restrictions for IFR operators. Small operators with limited maintenance resources may face higher relative costs or small scheduling delays.\n\n- Implementation risk: inspections rely on maintenance personnel locating and correctly assessing the small placard and port obstruction; spares inventories and non-airworthy stock may not be tracked, creating a risk of installing an uninspected part unless supply-chain checks are added.\n\n- Operational effects: some operators may be temporarily unable to conduct IFR flights until an inspection is completed, or they may choose to fit the temporary cockpit placard and defer inspection within the allowed interval.\n\nConcentrated benefits / diffuse costs and other market effects\n\n- Benefits (safety improvements) are concentrated in the small population of aeroplanes fitted with the affected valve; costs (inspection time, potential part replacement, and temporary operational limits) fall on the same group but are dispersed across many individual operators and maintainers. The AD tightens the pre-installation checks for replacement valves, increasing compliance work for parts suppliers and maintenance shops but not changing market structure or ownership rights.\n\n- The AD does not regulate prices, competition, or ownership. It does impose a compliance cost on operators and spare-parts handlers and slightly reduces short-term operational flexibility (notably IFR availability) until inspected parts are cleared.\n\nCross-references and dependencies\n\n- The AD depends on Cessna service bulletins for the detailed inspection procedure and cross-references earlier AD/CESSNA 208/22 and FAA AD 2008-26-10 (and earlier FAA ADs). Operators must ensure actions taken under this AD are consistent with those documents.\n\nBottom line (practical takeaways)\n\n- If you operate or maintain a Cessna 208/208B delivered in the specified date range or that has ever received a P/N 2013142-18 valve, you must inspect the alternate static selector valve port quickly, remove any obstructing part-number placard, and ensure replacements are inspected before installation. IFR-equipped aircraft must either be inspected within 10 days or carry the temporary IFR-prohibition placard until inspection. The costs are mainly inspection labour and possible replacement/repair; the stated safety benefit is avoidance of incorrect static instrument indications.\n\n(Requirements cited: Requirement 1, Requirement 2a/2b, Requirement 3, Requirement 4, Requirement 5; consult the referenced Cessna service bulletins for step-by-step procedures.)"},"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 valve part on specific Cessna aircraft models. It references an earlier related AD (208/22) but does not expand beyond the original safety purpose of ensuring the alternate static air source valve functions correctly."},"complexity_factors":["Multiple conditional applicability criteria with date ranges and part number exceptions","Nested requirements with different compliance timeframes for IFR vs non-IFR operations (Requirements 1, 2a, 2b, 3)","Cross-reference to prior directive AD/CESSNA 208/22 for exemption determination","Five distinct requirements with four different compliance deadlines (100 hours TIS/4 months, 10 days, before further flight, as of 10 days after effective date)","Specific part number tracking (P/N 2013142-18) and reference to four different Cessna service bulletins","Conditional logic for placard installation and subsequent removal (Requirement 3 only applies if 2b was used)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and repair of certain Cessna 208/208B Caravans because a misplaced parts placard can block the alternate static air source, leading to false altimeter/airspeed/vertical speed indications and loss of control. It applies to aircraft delivered new 1 Jan 1993–31 Mar 2008 and any with replacement valve P/N 2013142-18 since 1993 (except those already corrected under AD/CESSNA 208/22).\n\nInspections are required on short timelines (much faster for IFR operators); blocked ports must be cleared and misplaced placards removed before further flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-208-24-alternate-static-air-source-selector-valve-placard","history":"/api/acts/ad-cessna-208-24-alternate-static-air-source-selector-valve-placard/history","analysis":"/api/acts/ad-cessna-208-24-alternate-static-air-source-selector-valve-placard/analysis","conflicts":"/api/acts/ad-cessna-208-24-alternate-static-air-source-selector-valve-placard/conflicts","importantCases":"/api/acts/ad-cessna-208-24-alternate-static-air-source-selector-valve-placard/important-cases","documents":"/api/acts/ad-cessna-208-24-alternate-static-air-source-selector-valve-placard/documents"}}