{"id":"F2009L00060","name":"AD/CESSNA 337/31 - Alternate Static Air Source Selector Valve Placard","slug":"ad-cessna-337-31-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":76473,"registerId":"commonwealth-F2009L00060-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 337 Series Aeroplanes","sectionType":"division","heading":"Cessna 337 Series Aeroplanes","content":"### Cessna 337 Series Aeroplanes\n\n| AD/CESSNA 337/31 | 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; 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.

Table 1 - Aeroplanes that Could Have the Affected Part Installed

337

337F

F337H

T337D

337A (USAF 02B)

337G

FT337E

T337E

337B

337H

FT337F

T337F

337C

F337E

M337B(USAF 02A)

T337H

337D

F337F

T337B

T337H-SP

337E

F337G

T337C

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

\n```\n\n| | b. 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.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. |\n\n| | 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 several ADs against various models of Cessna aircraft 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 337/31","sectionType":"part","heading":"AD/CESSNA 337/31","content":"## AD/CESSNA 337/31","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 focused scope on the specific safety defect regarding the alternate static air source selector valve placard obstruction. It does not expand beyond the original safety purpose of ensuring proper airflow to flight instruments."},"complexity_factors":["Multiple conditional pathways based on IFR vs non-IFR equipment status","Interdependent requirements (Requirement 2b leads to Requirement 3, which mandates removal of placards installed under 2b)","Dual applicability criteria (manufacture date OR replacement part installation)","Staggered compliance deadlines ranging from 'before further flight' to 4 months/100 hours","Cross-reference to four separate Cessna Service Bulletins for procedural details","Nested exceptions and alternative compliance methods (2a OR 2b)","Specific part number tracking (P/N 2013142-18) with historical replacement chain (replaced P/Ns 2013142-9, -13, -17)"],"plain_english_summary":"Some Cessna 337 aeroplanes have an alternate static air selector valve with its label accidentally covering the intake, which can block static pressure and cause altimeter/airspeed/vertical-speed errors. CASA’s AD requires owners/operators of the affected models (delivered 1993–2008 or fitted with that valve since 1993) to inspect and, if blocked, remove the label/clear the port and prevent IFR use until confirmed safe.\n\nThis fixes a manufacturing defect that could produce misleading instruments and lead to loss of control."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"This AD expands coverage beyond earlier FAA action by capturing aeroplanes and spare valves that may not have been included previously. It targets valves shipped from Cessna Parts Distribution between 1 Jan 1993 and 31 Mar 2008 and aircraft delivered within that same date range, as well as valves installed as replacements after 1 Jan 1993, requiring inspection, temporary placarding for IFR aircraft, or removal/replacement of obstructing placards."},"complexity_factors":["Multiple compliance paths (inspect now or fit temporary cockpit placard for IFR aircraft)","Different deadlines by requirement (10 days, 100 hours TIS or 4 months, before further flight)","Scope tied to specific part number (P/N 2013142-18) and delivery/installation date ranges","Applies only to listed Cessna 337 variants — identifying applicability requires cross-checking serial/model and parts history","Must follow procedures in one of several Cessna service bulletins (model-specific references)","Immediate operational effect for IFR-capable aircraft (temporary ban on IFR/alternate static use until inspection or placarding)","Replacement constraint: only install inspected P/N 2013142-18 valves found free from obstruction"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of listed Cessna 337 variants (delivered 1 Jan 1993–31 Mar 2008 or fitted with replacement valve P/N 2013142-18 after 1 Jan 1993) to inspect the alternate static air source selector valve for a part-number placard obstructing the port. For IFR-equipped aeroplanes the AD allows either immediate inspection or a temporary instrument-panel placard prohibiting IFR and use of the alternate static source until inspection. CASA says placard obstruction can make altimeter, airspeed and vertical-speed instruments read incorrectly."},"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-337-31-alternate-static-air-source-selector-valve-placard","history":"/api/acts/ad-cessna-337-31-alternate-static-air-source-selector-valve-placard/history","analysis":"/api/acts/ad-cessna-337-31-alternate-static-air-source-selector-valve-placard/analysis","conflicts":"/api/acts/ad-cessna-337-31-alternate-static-air-source-selector-valve-placard/conflicts","importantCases":"/api/acts/ad-cessna-337-31-alternate-static-air-source-selector-valve-placard/important-cases","documents":"/api/acts/ad-cessna-337-31-alternate-static-air-source-selector-valve-placard/documents"}}