{"id":"F2009L00051","name":"AD/CESSNA 177/34 - Alternate Static Air Source Selector Valve Placard","slug":"ad-cessna-177-34-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":76457,"registerId":"commonwealth-F2009L00051-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 177 Series Aeroplanes","sectionType":"division","heading":"Cessna 177 Series Aeroplanes","content":"### Cessna 177 Series Aeroplanes\n\n| AD/CESSNA 177/34 | 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 an 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 Had the Affected Part Installed

177

177A

177B

177RG

F177RG

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.”

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.

\n```\n\n| | 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| 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. |\n\n| | 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 177/34","sectionType":"part","heading":"AD/CESSNA 177/34","content":"## AD/CESSNA 177/34","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":5,"scope_assessment":{"changed":true,"description":"This AD expands the universe of affected aircraft beyond earlier FAA action by covering aeroplanes that received P/N 2013142‑18 between 1 Jan 1993 and 31 Mar 2008 and any aircraft with that part installed as a replacement after 1 Jan 1993. The background notes that the FAA subsequently identified 15 aeroplanes not previously affected by the earlier AD, and CASA cites inability to identify affected airframes without inspection, so the AD broadens mandatory inspections and controls on replacement parts."},"complexity_factors":["Applicability criteria combine model list (Table 1) with delivery and installation date ranges (delivered 1 Jan 1993–31 Mar 2008, or any installation of P/N 2013142-18 after 1 Jan 1993), increasing scope identification burden (Applicability).","Different requirement paths for non‑IFR and IFR‑equipped aeroplanes (Requirements 1, 2a, 2b) create conditional compliance choices and timing differences.","Multiple and tight compliance deadlines (10 days; within next 100 hours TIS or within 4 months, whichever first; before further flight; and 'as of 10 days'), raising operational scheduling complexity (Compliance table).","Temporary mitigation (fabricate/install instrument‑panel placard prohibiting IFR) combined with a later mandatory inspection and removal of that placard adds procedural steps and coordination between operations and maintenance (Requirements 2b, 3, and follow-up note).","Replacement-part control: prohibition on installing P/N 2013142-18 unless inspected and found unobstructed imposes supply/parts‑management duties (Requirement 5).","Cross-references to multiple Cessna service bulletins and a related FAA AD require access to and reliance on external technical documents for correct procedures (Service Bulletin and Note 3).","Enforcement and identification difficulty: CASA states it cannot determine which aeroplanes or spare assemblies contain the affected valves without inspection, implying a broad inspection burden on owners/operators (Background).","Some terms and performance expectations are operationally vague (e.g. 'equipped for flight under IFR', 'pilot’s clear view', 'assure the port is open and unobstructed'), leaving room for maintenance judgement and variable interpretation."],"plain_english_summary":"This Airworthiness Directive requires owners/operators and maintenance personnel of listed Cessna 177-series aeroplanes to inspect P/N 2013142-18 alternate static air source selector valves for a part‑number placard that might be blocking the valve port, remove any obstructing placards, and — for IFR‑equipped aircraft — either inspect immediately or install a temporary instrument‑panel placard prohibiting IFR until inspected. Only replacement valves that have been inspected and found unobstructed may be installed. Owners/operators pay for inspections and fixes; CASA enforces compliance."},"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 single part number on specific Cessna 177 variants. The document does not show scope creep; it precisely targets the identified safety risk without expanding to unrelated systems or aircraft types."},"complexity_factors":["Multiple conditional requirements based on aircraft equipment type (IFR vs non-IFR)","Nested alternative compliance paths (Requirement 2a OR 2b)","Cross-references to four separate Cessna Service Bulletins for technical procedures","Multiple compliance timeframes varying from 'before further flight' to '100 hours time-in-service or 4 months'","Specific part number tracking (P/N 2013142-18) with replacement history","Date range applicability (manufacture between 1 Jan 1993 and 31 Mar 2008)","Circular logic in Requirement 3 (inspecting after installing placards per 2b, then removing them)","Reference to foreign regulatory action (FAA AD 2008-26-10)"],"plain_english_summary":"This AD requires owners/operators of certain Cessna 177-series aeroplanes to inspect the alternate static air source selector valve because a manufacturer placard may be installed incorrectly and block a small port. A blocked port can give false altimeter, airspeed and vertical speed readings.\n\nIt affects 177-series aircraft delivered new between 1 Jan 1993 and 31 Mar 2008 or those fitted with the specific replacement valve after 1 Jan 1993. Immediate inspections or IFR restrictions/placards are required to prevent instrument-failure risks in IMC."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-177-34-alternate-static-air-source-selector-valve-placard","history":"/api/acts/ad-cessna-177-34-alternate-static-air-source-selector-valve-placard/history","analysis":"/api/acts/ad-cessna-177-34-alternate-static-air-source-selector-valve-placard/analysis","conflicts":"/api/acts/ad-cessna-177-34-alternate-static-air-source-selector-valve-placard/conflicts","importantCases":"/api/acts/ad-cessna-177-34-alternate-static-air-source-selector-valve-placard/important-cases","documents":"/api/acts/ad-cessna-177-34-alternate-static-air-source-selector-valve-placard/documents"}}