AD/CONVAIR/7 - Cockpit and Cabin Windows

Sliding windows, cabin windows, pilots’ windshields, and direct vision windows are the four categories of window addressed. Each has distinct compliance triggers and intervals. The sliding windows are identified by part numbers: P/N 340-3110307-7, -8 (older design), and the replacement windows P/N 340-3110307-9, -10. There is also reference to sliding windows P/N 240-3110315-6 or -7, which are not subject to the same inspection regime but if present and twelve years or older, they require the pressurised flight placard. Cabin windows are not identified by part number but by age and operational history. Window age is a central concept. Age is measured from date of manufacture for pilots’ windshields, or from time in service for other windows. The directive creates two critical age thresholds: five years old at 30 June 1980 (a historical trigger for the initial repetitive inspection requirement on certain sliding windows), and twelve years old (triggering either enhanced inspection intervals or the prohibition on pressurised flight unless windows are replaced or inspected). The placard action is a distinct concept: rather than mandating immediate replacement, the directive allows continued unpressurised operation if a placard is installed. This is a lower-cost compliance option in the short term, but it restricts operational capability. The termination action is replacement of sliding windows P/N -7 or -8 with P/N -9 or -10, which ends further inspection requirements for that window. The service bulletins (SB 600 and SB 640) are incorporated by reference; they contain the detailed inspection procedures. The operator must obtain those bulletins and follow the paragraphs specified (e.g., paragraph 2.D.(4) under the “Sliding Windows” Section, page 45 of SB 640). The directive recognises two operational states: pressurised operation and unpressurised operation. Windows that have been stored or fitted on unpressurised aircraft and are now being put into pressurised service must be inspected before return to pressurised flight. The note referencing FAA AD 80-08-03 indicates that this CASA directive originates from an FAA airworthiness directive, showing the global regulatory harmonisation typical of type-certificated aircraft. The effective date of 11 May 2006 is the date after which compliance is mandatory. There is no phase-in or hardship relief mentioned in the directive. The directive also implies a record-keeping concept: operators must know the manufacturing date or service time of each window, which may not be readily available for older aircraft, creating an information cost. The concept of time in service is used for direct vision windows, cabin windows, and certain inspections for pilots’ windshields, whereas age from date of manufacture applies to pilots’ windshields for the initial inspection. This distinction matters for compliance timing.

The directive directly applies to any person who is the registered operator or owner of a Convair Model 240, 340, or 440 aircraft, including those converted to turbopropeller power. In practice, this includes commercial cargo and passenger operators (such as freight carriers using these aircraft), private individuals, flying schools, and maintenance organisations that perform work on these aircraft. The aircraft type is relatively old (first produced in the late 1940s and 1950s), so the affected fleet is likely composed of converted turboprop models operated by niche carriers, charter companies, and historical operators. The directive also affects maintenance engineers and approved maintenance organisations (AMOs) who must perform the inspections in accordance with the service bulletins and record the results. The compliance burden falls disproportionately on operators with older windows, since windows approaching or exceeding twelve years require either frequent inspections (every 90 days or 500 hours) or placarding. For an operator with a small fleet or low utilisation, the 90-day inspection interval may require grounding the aircraft for inspection before the 500-hour limit is reached, imposing downtime that is not aligned with the operator’s schedule. The directive also affects parts suppliers and overhaul shops that produce or handle the replacement windows P/N -9 and -10. Replacement window costs, availability, and lead times become relevant compliance constraints. The placard requirement imposes a loss of pressurised flight capability, which for a cargo operator might mean loss of payload capacity if the aircraft is used for pressurised freight, or for a passenger operator a complete loss of revenue from that type. The directive does not exempt operators who only fly unpressurised; they still must comply if they later wish to pressurise. The effect on the resale market is that a potential buyer must check the window age and compliance status before purchase, adding due diligence costs. There is no distinction made between large airline operators and private owners; the obligations are identical. The directive also indirectly affects insurers, who may require proof of AD compliance before underwriting hull or liability cover. The cost of compliance is a direct addition to operating expense, and because the aircraft type is ageing, the pool of operators is likely shrinking, meaning the fixed cost of understanding and complying with the AD is spread over fewer aircraft. The original manufacturers (General Dynamics, Convair) no longer produce the aircraft, so support for the service bulletins may be legacy, creating reliance on third-party technical data.

The directive imposes several distinct duties on the aircraft operator. The first duty is to determine the age and part number of each window covered. For sliding windows, the operator must identify whether the installed window is P/N 340-3110307-7, -8, -9, or -10, or P/N 240-3110315-6 or -7. For pilots’ windshields, the operator must determine the date of manufacture. For direct vision windows and cabin windows, the operator must record the time in service. If records are incomplete, the operator may need to perform destructive or non-destructive inspection to ascertain age, or assume the worst case. The second duty is to perform the repetitive inspections at the intervals specified: for sliding windows P/N -7/-8 used in pressurised operations, every 100 hours; for pilots’ windshields 12+ years old, initially within 250 hours and thereafter every 90 days or 500 hours; for direct vision windows and cabin windows 12+ years old, same 90-day/500-hour intervals. The third duty is to install the placard “PRESSURISED FLIGHT PROHIBITED” when operating with damaged windows exceeding service bulletin limits, with sliding windows of certain part numbers that are twelve years or older, or with cabin windows twelve years or older. The placard must be in full view of the pilots. The fourth duty is to remove the placard only when the inspections or replacements required by the directive have been complied with. The operator has a right to terminate the inspection requirements for a sliding window by replacing it with a new window P/N 340-3110307-9 or -10. That replacement can be done at any time, and once done, further repetitive inspections for that window are not required. The operator also has the right to defer mandatory window replacement by installing the placard and operating unpressurised, effectively choosing a lower-cost but operationally restrictive path. The operator does not have a right to deviate from the compliance intervals or methods without an alternative means of compliance approved by CASA, though the directive does not explicitly mention such a process; it would be available under the broader regulatory framework. The duties extend to any maintenance person performing the inspection; they must follow the exact steps in the service bulletins. Failure to perform the inspection or to install the placard when required is a breach of the directive. The operator is also duty-bound to ensure that windows that have been in storage or used unpressurised are inspected before being returned to pressurised flight. There is no duty to replace windows at a fixed calendar interval; replacement is only mandated if the inspection reveals damage exceeding limits, or if the operator chooses to terminate repetitive inspections.

The directive itself does not contain penalty provisions, because airworthiness directives are issued under the Civil Aviation Act 1988 (Cth) and the Civil Aviation Regulations (CAR) or Civil Aviation Safety Regulations (CASR). A breach of an airworthiness directive is a breach of the Act or Regulations, which can attract penalties including infringement notices (on-the-spot fines), criminal prosecution with fines or imprisonment for more serious breaches, and civil penalties. For an individual, the maximum penalty under the Civil Aviation Act for contravening a condition of an airworthiness certificate or failing to comply with a maintenance requirement can be up to 50 penalty units per offence. For a body corporate, the penalty can be up to five times that amount. In addition, CASA can suspend or cancel the aircraft’s certificate of airworthiness, effectively grounding the aircraft until compliance is demonstrated. CASA can also issue enforceable undertakings or take administrative action against the operator’s maintenance approval. The practical enforcement mechanism is during routine surveillance, ramp checks, or maintenance record audits. If an inspector finds that the aircraft is being operated pressurised with windows that require the placard but lack it, or that the repetitive inspections have not been carried out, the aircraft can be grounded immediately. The directive’s ‘before further pressurised flight’ and ‘before further flight’ compliance language makes it clear that operation without compliance is not permitted. For a commercial operator, the business cost of grounding can far exceed the penalty amount. The enforcement risk is heightened by the age-based triggers: windows that are twelve years old or older are relatively easy to age-check from records. An operator who cannot produce inspection records for such windows is vulnerable. Because the directive references FAA AD 80-08-03, CASA may also coordinate with the FAA on enforcement for aircraft operating internationally. The directive itself does not specify a defence of reasonable mistake or due diligence, but those defences would be available under general criminal law principles if a prosecution were brought. The penalty exposure creates an incentive to comply strictly, but the burden of proof that inspections were performed at the correct intervals rests on the operator. If an operator fails to record the inspection properly, enforcement may presume non-compliance.

This airworthiness directive is a specific mandatory requirement under the regulatory framework established by the Civil Aviation Act 1988 (Cth) and the Civil Aviation Safety Regulations 1998 (CASR). It sits as a supplement to the general maintenance obligations under CASR Part 42 (continuing airworthiness) and Part 145 (maintenance organisations). The directive does not replace those general regulations but adds window-specific requirements. The directive also references FAA AD 80-08-03, meaning that aircraft operating under a bilateral airworthiness agreement may also need to comply with the US directive. For aircraft on the Australian register that also operate in the US or under FAA oversight, the CASA AD is the Australian equivalent; compliance with the CASA AD should satisfy FAA compliance because the content is essentially the same. The directive incorporates by reference two General Dynamics service bulletins (SB 600 and SB 640) dated 16 January 1980. Those bulletins have the force of law to the extent that the directive requires specific paragraphs to be followed. The operator must obtain the current version of those bulletins; if later revisions exist, the operator should check whether CASA has recognised them as alternative means of compliance. The directive does not mention any interaction with the Work Health and Safety Act, but the window integrity requirements may also have implications for the safety of maintenance personnel. The directive does not address data protection or privacy; it is a purely technical safety regulation. In terms of contract law, an operator who leases an aircraft must ensure that lease terms allocate responsibility for AD compliance; the directive creates a statutory obligation that cannot be contracted out of. For a sale of aircraft, the directive may be a material defect affecting value. There is no interaction with competition law, but the cost of compliance could affect the viability of small operators relative to larger ones, indirectly affecting competition in the air cargo or charter market. The directive also interacts with the CASA Airworthiness Bulletin system; any subsequent bulletins that clarify inspection techniques or allow alternative methods would need to be considered. The directive does not interact with environmental laws directly, but window replacement generates waste that must be disposed of in accordance with environmental regulations. The directive also does not interact with the Privacy Act; it does not require collection of personal information. Operators should be aware that the directive does not override the aircraft’s flight manual; the placard requirement must be compatible with other cockpit placards.

The source document is the sole version of AD/CONVAIR/7 provided. It became effective on 11 May 2006 and was issued by the Delegate of CASA on 29 March 2006. There is no indication in the source that this directive has been amended, superseded, or withdrawn. The directive’s number is AD/CONVAIR/7 and it bears the issue number 5/2006. It references an older FAA AD (80-08-03) dating from 1980, which would have been the original US directive that prompted this Australian adoption. It is possible that earlier versions of this CASA directive existed (e.g., AD/CONVAIR/7 with an earlier issue date), but the source does not mention any. The directive does not contain a revision table or list of amendments. In the absence of any amendment history in the document, the reader must treat this as the only enacted version. However, operators should verify with CASA’s current database whether any later amendment or replacement directive (e.g., AD/CONVAIR/7 Amdt 1) has been published since 2006. The original FAA AD 80-08-03 may have been superseded by later FAA ADs, and CASA may have adopted those changes in a later directive not shown here. This is a significant compliance risk: the source document is nearly two decades old, and maintenance practices or window part numbers may have changed. The operator is responsible for checking the current regulatory status. The directive does not indicate any transition period or phase-out. There is no mention of a review date. The directive’s term is indefinite until superseded or cancelled. The absence of amendment history in the source means this deep dive cannot report any changes, but the operator must not assume the directive is static. CASA’s website and the Federal Register of Legislation should be searched for any subsequent instruments that modify or revoke this AD.

The source document contains no reference to any litigation, court decisions, or administrative appeals related to this airworthiness directive. There are no case names mentioned, no enforcement actions described, and no tribunal rulings cited. That is typical for a technical airworthiness directive, which is rarely litigated directly because the regulatory power is well established under the Civil Aviation Act. Most disputes arise in the context of enforcement proceedings, where an operator contests a penalty or grounding order by arguing that the directive was not applicable or that compliance was achieved. However, no such cases are noted in the source material. It is possible that litigation has occurred outside the scope of this document , for example, in the US concerning the underlying FAA AD , but the source does not provide that information and I cannot invent it. The lack of litigation history in the source suggests that either the directive has been complied with without challenge, or that legal challenges, if any, were not recorded in the AD itself. In Australia, airworthiness directives can be subject to merits review by the Administrative Appeals Tribunal if CASA refuses to grant an alternative means of compliance, but again, no such proceedings are referenced. For the purposes of this deep dive, the litigation history section is confined to stating that the source document contains no mention of litigation. Practitioners should be aware that the directive has been in force for over 15 years, and the absence of publicised litigation may indicate that the requirements are clear and industry compliance is routine. However, the lack of case law does not mean the directive has never been enforced; it may simply reflect that enforcement actions are resolved administratively without court proceedings.

Several aspects of this directive can trap the unwary operator. First, the age thresholds are not uniform. For sliding windows P/N 340-3110307-7/-8, the repetitive inspection requirement applies to windows that were five years old or older at 30 June 1980. That date is now over 40 years in the past, meaning every remaining example of those windows will be far older, but the directive still requires the repetitive inspections at 100-hour intervals if the aircraft is pressurised. An operator might mistakenly assume that if the window has already passed an inspection at some point, the repetitive cycle resets; it does not. The 100-hour interval is continuous. Second, the placard requirement can be triggered by the presence of sliding windows P/N 240-3110315-6 or -7 that are twelve years old or older, even without any damage. An operator of an older model may have those part numbers and not realise they are included. Third, cabin windows that are twelve years old or older also trigger the placard, irrespective of condition. The only way to remove the placard for those windows is to perform the inspection in Requirement 7 (which also applies to cabin windows over twelve years old) and thereafter at 90-day or 500-hour intervals. But note that Requirement 7 says “for cabin windows with over 12 years time in service, inspect in accordance with …” and Requirement 4. says for cabin windows that are twelve years or older that have been in storage or used unpressurised, inspect before return to pressurised flight. The interaction between Requirement 7 and the placard condition is not spelled out; a literal reading suggests that if you do the inspection per Requirement 7, you may remove the placard, but then you must continue the repetitive inspections. Fourth, the directive does not define what constitutes “damage” beyond referencing the service bulletins. It is possible that the bulletins themselves contain acceptable damage limits, and the operator must have access to those bulletins to determine compliance. Fifth, the compliance periods for some inspections are “within 100 hours time in service after 11 May 2006, and thereafter at intervals not to exceed 100 hours time in service.” This means the first inspection might have been due soon after 2006; if the aircraft has not been pressurised flown since, the operator may think the requirement lapsed. Requirement 2 makes clear that if the aircraft is to be operated pressurised with non-compliant windows, the placard must be installed; so if the aircraft is flown unpressurised, the 100-hour inspection may not be triggered, but the placard requirement stands. Sixth, the directive states that the placard “may be removed when the inspections or window replacements required by this Directive have been complied with.” That implies that full compliance may involve multiple inspections across different window types; the placard only goes away when all requirements are met. Seventh, there is no exemption for aircraft that are rarely flown. The 90-day interval is calendar-based, so an aircraft parked for months could still require an inspection. Eighth, the directive does not specify what records must be kept to prove compliance, but the burden of proof falls on the operator. Ninth, the replacement window P/N -9 or -10 terminates inspections only for the replaced window; other windows on the same aircraft remain subject to their own requirements. Tenth, note that Requirement 1 says “for sliding windows … which were five years old or older at 30 June 1980, and replaced with a serviceable window: Repetitively inspect …”. That seems to be a past tense: if the window was replaced on or before that date with a serviceable window, then you must inspect. But the compliance action says “unless already replaced, before further pressurised flight.” This is confusing; it may mean that if the window was not replaced before 2006, you must inspect. The operator should read carefully.

Compliance with AD/CONVAIR/7 requires a systematic approach based on each window type and its age. The operator must first inventory all windows on the aircraft by location, part number, date of manufacture, and time in service. For sliding windows, identify the part number. If the window is P/N 340-3110307-7 or -8, determine whether it was five years old or older at 30 June 1980. If yes, and if the aircraft is operated pressurised, perform the inspection per Requirement 3 every 100 hours time in service. The operator can replace that window with a new P/N -9 or -10 to terminate the 100-hour inspections. If the window is P/N 340-3110307-7 or -8 and is twelve years old or older, or if the window is P/N 240-3110315-6 or -7 and twelve years or older, the aircraft must not be flown pressurised unless the windows have been inspected per the service bulletins and are found to be within limits. The operator can choose to install the placard instead, but then pressurised flight is prohibited. For pilots’ windshields, determine the date of manufacture. If twelve years or older from date of manufacture, perform the inspection per SB within 250 hours time in service after 11 May 2006, and thereafter every 90 days or 500 hours, whichever occurs first. For direct vision windows, if over twelve years time in service, perform the inspection per SB within 250 hours and then at the same interval. For cabin windows, if over twelve years time in service, inspect per SB within 250 hours and then every 90 days or 500 hours. For any window that has been in storage or used unpressurised and is now being put into pressurised service, perform the relevant inspection before return to pressurised flight. After each inspection, record the results in the aircraft maintenance log. If any window fails the inspection (damage exceeds limits), replace it or install the placard. Maintain a compliance schedule with reminder dates for repetitive inspections. Obtain copies of General Dynamics Service Bulletins SB 600 (240D) No. 53-4B and SB 640 (340D) No. 53-5B, both dated 16 January 1980, and follow the specific paragraphs referenced (2.D.(4) under “Sliding Windows”, 2.D.4 under “Pilots’ Windshield”, 2.D.4 under “DV Windows”, 2.D.(4) under “Cabin Windows”). If the operator cannot determine window age due to missing records, a conservative approach is to assume the worst case (i.e., that the window is the oldest possible age) and apply the most stringent inspection regime. The operator should engage an AMO with Convair experience to perform the inspections, as the service bulletins may contain proprietary procedures. Finally, check CASA’s website for any subsequent amendments, alternative means of compliance, or superseding directives. For ease of record-keeping, create a spreadsheet tracking each window’s part number, age, compliance dates, and next due date. The placard, if needed, should be permanent and visible to both pilots. The operator should also ensure that if the placard is installed, all flight crew are briefed that pressurised flight is prohibited and that the placard cannot be removed until all compliance actions are completed.