{"id":"F2008L01354","name":"AD/CESSNA 206/65 - Alternate Static Air Source Valve","slug":"ad-cessna-206-65-alternate-static-air-source-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73605,"registerId":"commonwealth-F2008L01354-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 206/65 | Alternate Static Air Source Valve | 7/2008 TX |\n| ---------------- | --------------------------------- | --------- |\n\n```html\n

Applicability:

Aeroplanes models listed in Table 1 that have an alternate static air source selector valve, part number (P/N) 2013142-18, installed after 19 November 2007.

Table 1 - Applicability for Aeroplanes that Could Have Had the Affected
Part Installed as a Replacement Part or From Parts Held as Spares

Model

Serial Numbers (S/N)

206
206H
P206
U206
T206H
TU206A
TU206B
TU206C
TU206D
TU206E
TU206F
TU206G

All S/Ns
All S/Ns beginning with 20608001
All S/Ns
All S/Ns
All S/Ns beginning with T20608001
All S/Ns
All S/Ns
All S/Ns
All S/Ns
All S/Ns
All S/Ns
All S/Ns

Note 1: P/N 2013142-18 replaced P/Ns 2013142-9, -13 and -17.

Requirement:

1. For aeroplanes listed in Table 1 - Either:

a. Inspect the alternate static air source selector valve in accordance with Requirement 3, or

b. Inspect the aeroplane’s maintenance records to determine if the alternate static air source selector valve has been replaced since 19 November 2007 with P/N 2013142-18, if the valve has not been replaced no further action is necessary.

Note 2: The Requirement 1.b. inspection and determination may be accomplished and certified for by the aeroplane operator, provided that they hold at least a private pilot’s licence.

\n```\n\n| | 2. If the Requirement 1.b. determination indicates that a P/N 2013142-18 alternate static air source selector valve has been installed inspect the valve in accordance with Requirement 3. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | 3. Inspect the alternate static air source selector valve to assure that the part number identification placard is not obstructing the port as follows: |\n| | a. Adjust the pilot and copilot seats as far aft as possible. |\n| | b. Use a flashlight and mirror to inspect the alternate static air source selector valve to assure the port on the forward end of the valve is clearly visible and not covered by the part number identification placard. |\n| | 4. If, during any Requirement 3 inspection, the alternate static air source selector valve port is found obstructed by the part number identification placard, remove the placard from the valve body, discard the placard and assure that the port is open and unobstructed. |\n| | 5. Static air source selector valves P/N 2013142-18 installed as modification or replacement parts on or after the effective date of this Directive must be inspected in accordance with Requirement 3 prior to installation. |\n| | Note 3: FAA AD 2008-10-02 Amdt 39-15508, which becomes effective on 12 May 2008, refers. |\n| Compliance: | For Requirements 1, 2 and 3 - Before further flight after the effective date of this Directive. |\n| | For Requirement 4 - Before further flight after the Requirement 1 inspection. |\n| | For Requirement 5 - As of the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 13 May 2008. |\n| Background: | The United States Federal Aviation Administration (FAA) has received reports of improper installation of the part number identification placard on alternate static air source selector valves of certain Cessna 172, 175, 180, 182, 185, 206, 207, 208, 210 and 303 series aeroplanes. The part number identification placard refers to alternative air source selector valves, part number 2013142-18, that were manufactured between 20 November 2007 and 18 February 2008. The part number identification placard was installed on the valve body in a location that covers the port, which is the inlet for static air reference into the valve. The problem was discovered during a quality control check. |\n\n| | The FAA has advised that all parts held in stock at Cessna have been corrected and that Cessna has no way of verifying how many of these assemblies were manufactured and sent to the field with the part number identification placard installed over the alternate static air source selector valve port. 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. |\n| --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | 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| | CASA has varied the inspection requirements to allow the aeroplane operator to determine if a P/N 2013142-18 selector valve has been installed since 19 November 2007. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n6 May 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 206/65","sectionType":"part","heading":"AD/CESSNA 206/65","content":"## AD/CESSNA 206/65","sortOrder":1},{"sectionNumber":"Alternate Static Air Source Valve","sectionType":"part","heading":"Alternate Static Air Source Valve","content":"## Alternate Static Air Source Valve","sortOrder":2},{"sectionNumber":"7/2008 TX","sectionType":"part","heading":"7/2008 TX","content":"## 7/2008 TX","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains focused on the original safety issue: placards obstructing the static inlet port on P/N 2013142-18 valves. CASA’s variation (allowing the operator with a private pilot licence to certify the records check) narrows the compliance method but does not broaden the substantive scope of the requirement. There is no substantive expansion beyond the original safety fix (inspection and removal of obstructing placard, and pre-installation inspection of replacement parts)."},"complexity_factors":["Short directive with 5 numbered requirements","Single defined part number to check (P/N 2013142-18) and clear date cut-off (installed after 19 November 2007)","Applicability limited to specific Cessna 206-series models and serial-number ranges (Table 1)","One procedural inspection (Requirement 3) with simple diagnostic steps (seat position, flashlight, mirror)","Minor administrative exception allowing operator with private pilot licence to certify records check (Note 2)","Cross-reference to FAA AD but no extensive cross-referencing or nested exceptions"],"plain_english_summary":"**What this directive does (mechanics)**\n\n- It requires inspection of a specific alternate static air source selector valve (part number 2013142-18) installed on certain Cessna 206-series aeroplanes, and it requires removal of a part-number placard if that placard is covering the valve inlet port.\n- Applicability: aeroplanes listed in Table 1 that have P/N 2013142-18 installed after 19 November 2007 (the table lists Cessna 206 variants and applicable serial numbers).\n- Two initial options for affected aeroplanes:\n - Inspect the valve itself following the step-by-step check in Requirement 3, or\n - Inspect the aeroplane maintenance records to establish whether the valve with P/N 2013142-18 was installed after 19 November 2007; if not, no further action is required. (Note: the operator may perform and certify this records-check if they hold at least a private pilot licence.)\n- If the records-check shows P/N 2013142-18 was installed, the valve must be inspected by: seating pilot and copilot aft, using a flashlight and mirror to confirm the forward-end port on the valve is visible and not covered by the part-number identification placard.\n- If the placard is obstructing the port, the placard must be removed and discarded and the port confirmed open.\n- Any P/N 2013142-18 valves installed as modifications or replacements on/after the directive’s effective date must be inspected for the same placard obstruction before installation.\n- Compliance timing: inspections must be done before further flight after the directive’s effective date (and placard removal must be done before further flight after discovering an obstruction).\n\n**Who this affects**\n\n- Primary: operators and owners of the Cessna 206-series aeroplanes listed in the applicability table that may have P/N 2013142-18 installed.\n- Secondary: maintenance organisations and technicians who install or replace the valve, and parts suppliers holding spares of P/N 2013142-18.\n- Note: an aeroplane operator holding a private pilot licence may legally perform and certify the records inspection option (Requirement 1.b) instead of a maintenance organisation.\n\n**Why it matters (safety mechanism and risk)**\n\n- The part-number placard on some P/N 2013142-18 valves was manufactured/installed in a position that may cover the valve’s forward inlet port (the static air inlet). If that port is obstructed, the aeroplane’s static instruments (altimeter, airspeed indicator, vertical speed indicator) could show incorrect information. The directive states that incorrect indications could lead a pilot to respond to false data and potentially lose control.\n- The directive implements a low-cost, direct fix: visually verify the port is unobstructed and remove the placard if it obstructs the port.\n\n**Implementation details that change behaviour and decision rights**\n\n- Who pays and who decides: aircraft operators and their maintenance providers bear the time and labour cost of inspections and any placard removal (Requirement 3 and 4). Operators may decide to use the records-check route (1.b) where eligible (private pilot licence), which lowers immediate labour cost compared with a physical inspection.\n- Maintenance providers must also inspect any P/N 2013142-18 valve prior to installation (Requirement 5), so suppliers/installers face an additional pre-installation step.\n- The regulator (CASA) issued the directive and allowed a limited variation from the FAA procedure by permitting the operator (with at least a private pilot licence) to certify the records-check; that is an administrative flexibility that reduces cost/ground time for some operators.\n\n**Costs, incentives, trade-offs and implementation risks**\n\n- Direct costs: brief inspection time (flashlight, mirror), small labour cost, possible brief grounding until inspection is completed (compliance requires ‘before further flight’). If a placard must be removed, the physical action is trivial and the placard is discarded.\n- Opportunity cost: time aircraft are unavailable while compliance is performed; for commercial operators this is potentially higher if inspections delay flights.\n- Incentives: the records-check option incentivises operators with clear maintenance logs to avoid a physical inspection when records show the valve was not installed after the relevant date.\n- Implementation risk: human error in inspection (missed obstruction), incomplete maintenance records, or incorrectly identifying the valve P/N could leave an obstructing placard in service.\n- Compliance burden: low per-aircraft but potentially non-trivial in aggregate across many aircraft and spare-parts inventories; maintenance organisations must add an inspection step to installation workflows.\n\n**Effects on private enterprise, competition and choice**\n\n- Maintenance shops/suppliers: minor procedural change — inspect P/N 2013142-18 valves before installation; minimal impact on competition or prices other than small labour-time costs built into service calls or part installations.\n- Operators: some may choose to pre-inspect spares in inventory to avoid delays at installation; some may modify procurement practice to prefer valves without the placard or earlier/later P/Ns if available.\n- No direct effect on ownership rights, contract freedom, or speech. The directive constrains how a specific aviation part may be accepted/installed and imposes safety-check responsibilities.\n\n**Concentrated benefits and diffuse costs**\n\n- Concentrated benefits: an individual operator who avoids an instrument failure and the associated safety risk gains directly. Aircraft occupants and third parties benefit from reduced risk of a loss-of-control event.\n- Diffuse costs: many operators each incur a small inspection time and possible delay; overall fleet-wide burden is spread across many small actors.\n\n**Source claim and testing**\n\n- The directive follows an FAA finding that some valves had their part-number placards installed over the inlet port during manufacture between 20 Nov 2007 and 18 Feb 2008. CASA adopted requirements to inspect and correct any such valves. This is a targeted, low-cost mechanical inspection and corrective action. The trade-off is small labour/grounding time versus the safety risk posed by potentially unreliable static system instrumentation.\n\n(References: Requirements 1–5 and Notes in the directive.)"},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD remains tightly scoped to its original safety purpose: addressing a specific manufacturing defect in one part number installed during a defined time window. The variation allowing record-checking by private pilots is a procedural flexibility that reduces burden without expanding scope."},"complexity_factors":["Single discrete technical issue (one part number, one manufacturing date range)","Clear binary decision tree: check records first, inspect only if necessary","Only 5 substantive requirements with sequential logic","One defined part number (P/N 2013142-18) and one date threshold (19 November 2007)","Simple compliance timeline: 'before further flight' or 'as of effective date'","Limited applicability table with 12 model variants but 'all serial numbers' scope","No nested exceptions or conditional sub-clauses beyond the inspect-or-check-records alternative"],"plain_english_summary":"This AD requires owners/operators of certain Cessna 206-series aircraft to confirm a replacement valve (PN 2013142‑18), if installed after 19 Nov 2007, does not have an identification label blocking its air intake. Pilots with at least a private licence may inspect or check maintenance records; if the valve was fitted or the port is blocked, the label must be removed before flight.\n\nIt matters because a blocked port can make static instruments (altitude, airspeed, VSI) give false readings, risking loss of control in IMC."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-206-65-alternate-static-air-source-valve","history":"/api/acts/ad-cessna-206-65-alternate-static-air-source-valve/history","analysis":"/api/acts/ad-cessna-206-65-alternate-static-air-source-valve/analysis","conflicts":"/api/acts/ad-cessna-206-65-alternate-static-air-source-valve/conflicts","importantCases":"/api/acts/ad-cessna-206-65-alternate-static-air-source-valve/important-cases","documents":"/api/acts/ad-cessna-206-65-alternate-static-air-source-valve/documents"}}