AD/CESSNA 185/50 - Alternate Static Air Source Selector Valve Placard

An airworthiness directive (AD) is a legally enforceable notification issued by CASA under the Civil Aviation Regulations requiring inspection, modification, or repair of an aeroplane to correct an unsafe condition. AD/CESSNA 185/50 exemplifies a “continuing airworthiness” directive that imposes a one‑time or recurring action on owners and operators. The central concept is the “alternate static air source selector valve” - a component that allows the pilot to select an alternative source of static air pressure for the pitot‑static system in the event the primary static port becomes blocked. In Cessna 185 series and related models, this valve is a small assembly with a part number identification placard affixed to its body. The unsafe condition arises when that placard, originally applied during manufacturing or replacement, is positioned so that it physically obstructs the valve’s port - the opening through which static air flows to the instruments.

The “port obstruction” is the key defect. If obstructed, the static air pressure sensed by the altimeter, airspeed indicator, and vertical speed indicator will be incorrect. The consequence is erroneous readings: the altimeter may show the wrong altitude, the airspeed indicator may under‑ or over‑read, and the vertical speed indicator may lag or show a false rate of climb or descent. In IFR conditions, where pilots rely exclusively on instruments, such errors could lead to spatial disorientation and loss of control. The AD categorises aircraft by whether they are “equipped for flight under instrument flight rules (IFR)”. This distinction dictates the compliance timeline and whether the temporary placarding option is available. Non‑IFR aircraft have a longer compliance period because they are less likely to be operated in low‑visibility conditions where instrument reliance is critical.

The AD introduces a compliance schedule using two metrics: “time‑in‑service (TIS)” and calendar months. TIS means the total time the aircraft has been operated since manufacture or last overhaul, measured in hours. Operators must comply by the earlier of 100 hours TIS or 4 months after 16 January 2009. For IFR aircraft, the initial inspection or placarding must occur within 10 days. This short timeline reflects the higher risk for IFR operations. The directive also includes a “carve‑out”: aircraft that have already undergone the modification required in AD/CESSNA 185/49 and remain in compliance are excluded from the applicability, because that earlier AD presumably corrected the obstruction. The Table 1 list of affected models includes 185, 185A, 185B, 185C, 185D, A185E, A185F, and notably the 182E (a model often used as a utility/observation aircraft but also operated IFR).

The part‑number history is important. Note 2 explains that P/N 2013142‑18 replaced earlier part numbers 2013142‑9, ‑13, and ‑17. This means any valve bearing one of those earlier numbers that was later replaced with the ‑18 variant could be affected. The AD also covers any ‑18 valve shipped from Cessna Parts Distribution between 1 January 1993 and 31 March 2008, regardless of when it was installed. That 15‑year window captures a large population of valves. The directive does not require replacement of the valve unless it is obstructed; it only requires inspection and removal of the offending placard. However, requirement 5 imposes a futures obligation: any replacement valve must be a pre‑inspected unobstructed unit.

The primary affected group is the owners and operators of the specific Cessna aeroplane models listed in Table 1: the 185, 185A, 185B, 185C, 185D, A185E, A185F, and the 182E. These are mainly single‑engine piston and turbine‑powered utility aircraft used in agricultural, charter, cargo, and private operations. The 182E inclusion is notable because that model is a fixed‑gear variant often used for survey work and bush flying; its presence in the table suggests the same valve assembly was used across multiple Cessna lines. For each of these models, the AD applies only if the aircraft was initially delivered from the manufacturer between 1 January 1993 and 31 March 2008, unless it has already received the AD/CESSNA 185/49 modification and remains in compliance. Alternatively, any aircraft of those models that had a replacement P/N 2013142‑18 valve installed at any time after 1 January 1993 (including after the shipping window) is caught, again unless it is already compliant with the earlier AD.

This dual applicability test means maintenance history must be reviewed: an aircraft delivered before 1993 can still be affected if it later received a replacement ‑18 valve. Similarly, an aircraft delivered after March 2008 is not affected because the shipping window closed then. The AD therefore imposes a record‑search obligation on operators to determine whether their aircraft falls within scope. The secondary group is maintenance organisations (LAMEs), maintenance repair organisations, and authorised engineers who perform inspections, placard installations, and placard removals. They must ensure they have access to the applicable Cessna service bulletins and follow the procedures exactly. The service bulletins are not reproduced in the AD, so the organisation must obtain them from Cessna or its distributor.

Parts distributors and stockists are indirectly affected by requirement 5: any P/N 2013142‑18 valve sold or installed after 10 days from the effective date must be inspected and confirmed obstruction‑free before it is fitted. This imposes a quality‑control step on the supply chain. Sellers may need to inspect stock or provide evidence of inspection. Cessna itself is not a direct duty‑holder under the AD, but the directive relies on its service bulletins, so Cessna’s technical publications are effectively mandated.

The compliance timeline creates different classes of affected persons. IFR‑equipped aircraft operators face the tightest deadlines: within 10 days of 16 January 2009 they must either inspect or placard. That is 10 calendar days, not flying hours, so an aircraft that is not flown for two weeks could still be non‑compliant if no action was taken. Non‑IFR operators have up to 100 hours or 4 months, giving more flexibility. However, any aircraft that transitions from non‑IFR to IFR operation after the AD would presumably need to meet the IFR requirements at that point; the AD does not address that scenario explicitly.

The exclusion for aircraft already modified under AD 185/49 is a relief for operators who acted promptly on the earlier directive. But the condition “remains in compliance with that AD” means any subsequent maintenance that might reintroduce the obstructed valve (e.g., installing a new replacement ‑18 valve) would bring it back under this AD.

The AD imposes a series of mandatory duties with specific compliance deadlines. For non‑IFR aircraft, the duty is to inspect the valve port within 100 hours TIS or 4 months, and if obstruction is found, to remove the placard before further flight. For IFR‑equipped aircraft, the operator has a short‑term right to choose between two options. Option 2a is to inspect within 10 days, with removal of any obstruction before further flight. Option 2b is to placard the instrument panel before further flight with two prohibitions - no IFR operation and no use of the alternate static air source - and then within 100 hours or 4 months perform the inspection and remove those placards. The right to choose is valuable because it allows an operator who cannot immediately inspect to keep the aircraft flying in VFR conditions, provided the placards are installed and respected. However, the AD does not permit indefinite placarding; the placard is only a bridge to compliance.

Once the placard route is taken, the operator incurs a duty to comply with requirement 3: inspect within the longer period and then remove the placards before further flight. There is no option to retain the placards and continue VFR operation indefinitely; the AD contemplates that the inspection will occur and return the aircraft to full serviceability. If the operator fails to inspect within the 100 hours/4 months, the placard remains, and the aircraft is effectively prohibited from IFR and from using alternate static air, which may itself be a non‑compliance if the aircraft’s type certificate requires that system to be operative for IFR.

The duty under requirement 4 is absolute: if obstruction is found, the placard must be removed, discarded, and the port verified open before further flight. This overrides any other compliance deadline. Requirement 5 imposes a duty on anyone installing a replacement valve: from 10 days after the effective date, only an inspected, obstruction‑free valve may be installed. This duty applies even if the aircraft itself is otherwise unaffected by the AD (e.g., an aircraft delivered after March 2008 but needing a replacement valve - the AD’s applicability by delivery date does not apply, but requirement 5 still controls the valve part).

The AD does not prescribe who must perform the work, but by inference it must be a person authorised under the Civil Aviation Regulations to perform maintenance, given that the actions involve access to the pitot‑static system and installation of placards. The placard installation under requirement 2b is a minor modification that may be within the scope of a pilot‑owner under maintenance rules, but the AD does not grant relief from normal maintenance authorisation requirements.

Operators have a duty to keep records of compliance, including the inspection findings, placard removal, and any replacement valve purchases. Although the AD does not explicitly say so, non‑compliance would render the aircraft unairworthy, preventing it from being flown until the AD is complied with. There is no right to opt out; the only exemption is aircraft already compliant with AD 185/49. There is no provision for alternative methods of compliance (AMOC) in the text of the AD, but CASA typically allows AMOC applications under general regulation.

The AD does not itself specify penalties; enforcement derives from the Civil Aviation Act 1988 and Civil Aviation Regulations (CARs). Operating an aircraft that does not comply with an applicable airworthiness directive is a breach of the airworthiness requirements. Under CAR 42 (current version at the time) and associated regulations, an aircraft must be maintained in conformity with all applicable ADs. Non‑compliance is a strict liability offence: the operator need not intend to breach the law. Penalties can include infringement notices (on‑the‑spot fines), prosecution with court‑imposed fines, and potentially suspension or cancellation of the aircraft’s certificate of airworthiness.

For commercial operators, non‑compliance also risks enforcement by CASA’s Regulatory Oversight Division, which may issue directions to ground the aircraft, require re‑inspection, or impose conditions on the air operator’s certificate. Repeat or wilful non‑compliance could lead to criminal prosecution under the Crimes Act for fraud if certificates of release to service are falsified. The practical enforcement reality is that an AD compliance check is part of any routine airworthiness inspection and maintenance release. If an aircraft’s records do not show compliance with AD 185/50, the maintenance organisation cannot issue a certificate of release to service. The aircraft is effectively grounded until the AD is satisfied.

The AD’s compliance dates are hard deadlines. For requirement 1, the operator must have completed the inspection within 100 hours TIS from 16 January 2009. If that date is missed, the aircraft is unairworthy. For requirement 2a, the 10‑day deadline is extremely tight; an operator of an IFR aircraft that did not act by 26 January 2009 would be in breach. For requirement 2b, placards must be installed before further flight after the effective date, so any flight after 16 January 2009 without those placards (if the operator chose that route) is unlawful. Similarly, requirement 4 requires immediate grounding before further flight if obstruction is found.

CASA has power to issue further enforcement orders. The background indicates that CASA could not determine which aircraft had the problem, so the AD casts a wide net. If an operator believes their aircraft is not affected because of the AD 185/49 compliance, they bear the onus of proof through maintenance records. There is no penalty for being affected, only for failing to comply. The AD does not provide for extensions or waivers; operators would need to apply to CASA for an alternative method of compliance, which would require showing equivalent safety.

Removal of the placard from the valve body is a minor maintenance action, but it must be recorded. Discarding the placard means destroying it so it cannot be reapplied. The AD imposes a mandatory continuation: once the placard is removed, the valve is considered serviceable and no further action is needed unless a future replacement occurs. Failure to comply with requirement 5 when purchasing a replacement valve could result in installation of an obstructed valve, creating a separate airworthiness issue. Penalties for non‑compliance with that requirement would fall on the installer and the operator who flies with a non‑compliant part.

AD/CESSNA 185/50 operates within the framework of the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations (CASR) and its predecessor, the Civil Aviation Regulations (CAR). It is a specific airworthiness directive issued under the authority of CAR 199 (now CASR Part 39). An AD has effect as a condition of the aircraft’s certificate of airworthiness. Compliance with the AD is mandatory for the aircraft to be considered airworthy and lawfully operated. This AD also references and incorporates by reference the earlier AD/CESSNA 185/49. The earlier AD dealt with the same subject - port obstruction by the placard on P/N 2013142‑18 - but apparently did not cover later‑manufactured valves or those installed after that AD. This AD effectively supplements or replaces AD 185/49 for the broader population. The text does not state that AD 185/49 is withdrawn; instead it exempts aircraft that have complied with AD 185/49 and remain in compliance. This creates an interaction: an aircraft operator who complied with AD 185/49 does not need to do this AD, unless later maintenance reintroduced an affected valve.

The AD also notes that FAA AD 2008‑26‑10 (Amdt 39‑15776, 15 December 2008) refers. This indicates coordination with the US Federal Aviation Administration, as Cessna aircraft are US‑type certificated. For Australian operators of aircraft originally from the US, the US AD and the Australian AD may have different applicability and compliance times. The Australian AD is the controlling directive within Australia, even if the FAA AD is different. An operator who complies with the FAA AD may not automatically satisfy the Australian AD, especially if compliance times differ. However, the Cessna service bulletins referenced are identical to those referenced in the FAA AD, so the technical actions are likely the same.

The AD interacts with the airworthiness management regulations. Maintenance must be performed by persons authorised under Part 66 (LAME) or Part 145 (approved maintenance organisations). The placard installation under requirement 2b is a simple mechanical task that may be classed as elementary work under regulation, but the AD does not make any exception; normal regulatory rules apply. The AD also imposes a record‑keeping obligation implicitly - entries in the aircraft logbook or maintenance records must document compliance. Failure to do so can be treated as non‑compliance.

Sales and transfer of aircraft are affected indirectly. A prospective buyer would need to see evidence of compliance with this AD before accepting an aircraft. If the AD is not complied with, the aircraft’s value is diminished and it cannot be legally operated. Under state sale of goods laws, this could affect warranties, but aviation lex specialis likely limits consumer protections.

For operators holding an Air Operator’s Certificate (AOC) under CASR Part 119, compliance with ADs is part of the continuing airworthiness management system required by the regulations. Non‑compliance could be grounds for CASA to vary or suspend the AOC. Similarly, private operators risk enforcement action under the general aviation enforcement regime.

There is also a potential interaction with insurance. Most aviation insurance policies require the aircraft to be maintained in an airworthy condition and in compliance with all applicable ADs. Non‑compliance with this AD could void coverage for an accident caused by instrument malfunction, even if the placard obstruction was not the direct cause. The AD’s existence creates a presumption that the unsafe condition is serious.

The document provided is the sole version of AD/CESSNA 185/50, effective 16 January 2009. There is no indication in the text that it has been subsequently amended or superseded. However, it expressly refers to AD/CESSNA 185/49, which preceded it and was issued in response to FAA AD 2008‑10‑02. That earlier AD apparently covered a subset of the same issue but did not capture all affected valves. AD 185/50 extends the scope to valves shipped between 1 January 1993 and 31 March 2008, whereas AD 185/49 may have covered an earlier or narrower window. The background explains that after AD 185/49, additional reports of obstructed valves on 15 previously unaffected aeroplanes came to light, prompting this directive.

The AD itself does not list an amendment number or revision, but it is a standalone directive. CASA typically issues ADs as separate documents with a unique number (AD/CESSNA 185/50) and they are not formally amended unless CASA publishes a revision. There is no evidence of any subsequent revision. However, CASA’s AD database sometimes supersedes older directives with new numbers. In practice, an AD may be later superseded by a more comprehensive directive, but this text does not show that.

The effective date of 16 January 2009 is a fixed date. Compliance requirements are tied to that date, but they are not retroactive; they apply prospectively. The AD does not repeal any earlier directive; it creates an additional compliance path for aircraft not covered by AD 185/49. For aircraft already covered by AD 185/49, that directive remains in effect, and compliance with it exempts from this AD. Operators who complied with AD 185/49 need not take further action unless they later install a replacement valve that is not covered by that compliance.

The AD references service bulletins dated 6 October 2008 and 13 October 2008, revision 1, which indicates that those bulletins were themselves revised from earlier versions. Operators must ensure they use the exact revision specified. If a later revision exists, it may not be acceptable unless approved by CASA as an alternative method of compliance. The AD is static; it does not incorporate future revisions of those bulletins.

Given that this AD is from 2009, it is likely that all aircraft affected have been inspected and rectified by now, unless an aircraft remains in storage or has not been flown. However, the AD remains in full legal effect for any aircraft that still falls within its scope. If an aircraft was newly imported into Australia after 2009 and had not previously complied with this AD (because it was in a different jurisdiction), it would need to comply upon entry. Similarly, if a valve was removed and stored and later reinstalled without inspection, the AD requirements would apply again. Amendment history is therefore static but ongoing in effect.

The provided source text contains no mention of any litigation related to AD/CESSNA 185/50. There is no reference to court cases, tribunal decisions, or administrative appeals. Given that this is an airworthiness directive of a technical nature involving a placard obstruction, it is unlikely to have generated direct litigation. Airworthiness directives are generally not challenged in court; operators typically comply or seek alternative methods of compliance through CASA’s administrative processes. If a dispute arose, it would likely be under the Administrative Appeals Tribunal (AAT) regarding CASA’s decision to issue the AD or refusal of an alternative method of compliance. There is no information in the source to suggest any such proceedings.

The AD does reference FAA AD 2008‑26‑10, which may have been subject to litigation in the United States, but that is not mentioned and is not relevant to Australia. The absence of litigation history is notable but not unusual for a prescriptive safety directive. It indicates that the regulation was accepted by the industry or that any disputes were resolved without public proceedings. For the deep dive, we must state that no litigation is recorded in the source, rather than speculate about possible litigation. The source is the full text of the AD; it does not include any litigation history. Therefore, we state that the source does not contain any litigation history.

That said, the practical effect of non‑compliance could lead to enforcement actions that are reviewable. A decision by CASA to ground an aircraft or impose a fine could be appealed to the AAT. But as of the source, no such cases are referenced. The deep dive should note that the AD itself does not create a private right of action; it is a public law safety requirement. Litigation could theoretically arise if a third party (e.g., a passenger) sued an operator for negligence for failing to comply, but that is general law, not specific to this AD.

Given the strict output requirement not to invent cases, we will treat this section by stating that the source contains no litigation history and explain why that is typical. Provide analysis of what could happen, grounded in general principles, but not pretend there are cases.

Several traps lurk within the fine print of AD/CESSNA 185/50. First, the applicability carve‑out for aircraft that complied with AD/CESSNA 185/49 is narrower than it appears. The AD says the aircraft are not affected “unless the modification/rework required in AD/CESSNA 185/49 has been done and the aeroplane remains in compliance with that AD.” The phrase “remains in compliance” means that if any subsequent maintenance reintroduced a P/N 2013142‑18 valve that was not inspected under the earlier AD, the aircraft falls back under this AD. An operator who assumed their aircraft was permanently exempt could be caught if they later replaced the valve.

Second, the compliance timeline for IFR aircraft has a hidden complexity. Requirement 2b allows placarding before further flight as a substitute for immediate inspection, but requirement 3 then requires that the inspection be done within 100 hours or 4 months, after which the placards must be removed before further flight. An operator who installs the placards and then fails to inspect within the window is in double breach: they have placarded the aircraft (so it is not legal for IFR and the use of alternate static air is prohibited), and they have not complied with the mandatory inspection. Moreover, the removal of the placards is required before further flight after the inspection. If the operator removes the placards but then does not fly for a while, it is still compliant as long as the inspection was done. But if they inspect and find no obstruction, they must remove the placards before any flight.

Third, the placard wording is prescribed exactly: “IFR OPERATION IS PROHIBITED” and “USE OF THE ALTERNATE STATIC AIR SOURCE IS PROHIBITED.” The requirement uses at least 1/8‑inch letters, but does not specify colour or format. Using a non‑conforming size or a different wording (e.g., “not recommended”) would not satisfy the AD. Similarly, the placards must be installed on the instrument panel within the pilot’s clear view. Placing them elsewhere, such as on the glareshield or side panel, could be challenged.

Fourth, for non‑IFR aircraft, requirement 1 says to inspect to assure the placard is not obstructing the port. If obstruction is found, requirement 4 applies: remove placard before further flight. But the AD does not explicitly state that the aircraft can then be flown with the placard removed. That seems logical, but operators should record the removal. The AD does not require a logbook entry, but good practice dictates one.

Fifth, requirement 5 only applies to replacement valves. It says “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.” It does not say who does the inspection. The service bulletins referenced presumably contain inspection procedures. An operator could stock a replacement valve that is already inspected by the supplier, but if the supplier has not inspected the port, the operator must arrange for inspection before installation. This could cause delays.

Sixth, the AD covers the 182E model, which appears in Table 1 alongside 185 variants. An operator of a 182E might not check an AD titled “Cessna 185 Series Aeroplanes” and miss the applicability. The title is misleading; the table includes 182E. Similarly, the AD should be checked even if the aircraft is a 182E that was not originally delivered in the date range but received a replacement valve post‑1993.

Seventh, the background notes that the FAA has been informed that all valves shipped from Cessna Parts Distribution between 1 January 1993 and 31 March 2008 may have port obstruction. The use of “may” means that not every valve is obstructed, but every valve shipped in that window is subject to the inspection requirement. Operators cannot assume that because they have never had a problem the port is clear.

Eighth, the compliance deadlines are calendar or TIS, but for aircraft that are not flown regularly, the 4‑month calendar deadline may pass quickly. An aircraft stored or under maintenance for two months could suddenly find itself overdue. The AD does not exempt stored aircraft; the duty still applies.

Ninth, the removal of the placard under requirement 4 says “remove the placard from the valve body, discard the placard, and assure that the port is open and unobstructed.” There is no instruction to inspect the port itself - only to assure it is open. That likely means visually confirming and perhaps blowing air through. The service bulletins likely specify.

Tenth, the AD does not address what to do if the placard cannot be removed without damaging the valve. In that case, the valve itself might need replacement, but the AD only requires placard removal, not valve replacement. A creative interpretation might allow the valve assembly to be replaced, but that would be more costly. The operator is not forced to replace the valve if the port is clear after placard removal.

Compliance with AD/CESSNA 185/50 requires a systematic approach based on the aircraft’s IFR equipment status and maintenance history. The first step is to determine applicability. For each Cessna 185 series model (including 182E listed in Table 1), check the aircraft’s delivery date and the part number of the installed alternate static air source selector valve. If the aeroplane was initially delivered between 1 January 1993 and 31 March 2008, it is affected unless the modification required by AD/CESSNA 185/49 has been done and the aircraft remains in compliance with that AD. If the aircraft was delivered outside that window, it is still affected if it has ever had a P/N 2013142‑18 valve installed as a replacement after 1 January 1993, again unless it is already modified under AD 185/49. If the aircraft is already modified under AD 185/49, verify that the records show continued compliance (i.e., no subsequent installation of an unmodified valve). If not, proceed with this AD.

Next, determine whether the aircraft is equipped for IFR. Check the aircraft’s equipment list: does it have the required instruments and navigation equipment for IFR flight under CASR Part 91 or the applicable operational rules? If IFR equipped, the operator has two paths. Path A: within 10 days of 16 January 2009, inspect the valve to confirm the placard is not obstructing the port. Obtain a copy of the applicable Cessna service bulletin (SB08‑34‑02 Rev 1 for non‑Caravan singles; CAB08‑04 Rev 1 for Caravan; SEB08‑5 or MEB08‑6 as appropriate). Follow the bulletin’s procedure to gain access to the valve, visually inspect the placard position relative to the port, and if the placard obscures the port, remove it per requirement 4. Document the inspection and any placard removal in the aircraft maintenance records. No further placards are needed. Path B: before further flight after the effective date, fabricate two placards using at least 1/8‑inch letters reading exactly “IFR OPERATION IS PROHIBITED” and “USE OF THE ALTERNATE STATIC AIR SOURCE IS PROHIBITED.” Install them on the instrument panel in the pilot’s clear view. No inspection is required at this stage, but the aircraft cannot be flown IFR and the alternate static air source cannot be used. Then, within 100 hours time‑in‑service or 4 months from 16 January 2009 (whichever first), perform the same port inspection as Path A. After that inspection, and before further flight, remove the two placards from the instrument panel. If obstruction was found, also remove the valve placard.

For non‑IFR aircraft, within 100 hours TIS or 4 months, perform the inspection. If the placard obstructs the port, remove it before further flight. If no obstruction, no further action.

For all aircraft, if an obstruction is found during any inspection, follow requirement 4 immediately: remove the P/N placard from the valve body, discard it, and verify that the port is open (e.g., using a light or gentle air pressure). The aircraft may not be flown until this is done.

For future valve replacements, after 26 January 2009 (10 days after the effective date), any P/N 2013142‑18 valve installed must have been pre‑inspected and confirmed obstruction‑free. This means the installer must either purchase a valve already certified as inspected, or inspect the valve before installation per the service bulletin procedure. Keep records of that inspection.

Documentation: for each affected aircraft, create a logbook entry stating compliance with AD/CESSNA 185/50, including the date, TIS, inspection method, result, and any placard removal. If the path B placard option was used, note the date of placard installation and the date of subsequent removal. If the aircraft was already compliant under AD 185/49, cross‑reference that directive and confirm continued compliance.

The compliance period runs from 16 January 2009. For aircraft that have not been flown after that date, the TIS starts from zero; the 100‑hour count begins only when the aircraft is flown. The 4‑month calendar deadline runs regardless. Ensure the earlier deadline is met.

If the aircraft is used for IFR operations, plan for the 10‑day inspection or placarding. Schedule the inspection promptly to avoid grounding. For commercial operators, consider the economic cost of grounding during the inspection period; it may be cheaper to inspect immediately rather than use the placard option, which requires a second inspection within 4 months anyway.

Finally, if the aircraft is already modified under AD 185/49 but the records are unclear about continued compliance, it is safer to treat the aircraft as affected and perform the inspection. Non‑compliance risks enforcement and insurance issues.