AD/AIRCON/13 Amdt 3 - Kelly Aerospace Fuel Regulator Shutoff Valves & Cabin Heaters

The directive turns on several distinct concepts essential to understanding its operation.

Airworthiness Directive (AD). An AD is a legally enforceable order issued under the Civil Aviation Regulations. It is the primary instrument by which CASA mandates corrective action for known unsafe conditions in aircraft, engines, propellers, and appliances. Non-compliance renders the aircraft unairworthy and can result in grounding, fines, or loss of airworthiness certificate. This AD is a classic “repetitive inspection and conditional replacement” directive: it does not ground the fleet immediately but requires ongoing verification.

Fuel regulator shutoff valve. The component in question is a specific part made by Kelly Aerospace (and previously by Janitrol, C&D Airmotive Products, FL Aerospace, and Midland-Ross Corporation). The affected part numbers are 14D11, A14D11, B14D11, C14D11, 23D04, A23D04, B23D04, C23D04, and P23D04. These valves are used exclusively with Kelly Aerospace B1500, B2030, B2500, B3040, B3500, B4050, and B4500 B-Series combustion heaters. The valve controls fuel flow to the heater; a leak means raw fuel can enter the cabin or engine bay under certain conditions, creating a fire risk. The directive’s key metric is a manufacturer’s date code of 02/02 or later, which presumably marks when a design or production fix was implemented.

Combustion heater. These are cabin heating units that burn aircraft fuel (usually avgas) and blow heated air into the cabin. They are commonly installed in general aviation aircraft operating in cold climates. The B-Series heaters covered are those manufactured by Kelly Aerospace or any of the earlier entities, meaning the directive catches many aircraft built before 2002 even if the heater itself was not made by Kelly. The directive specifically notes that aircraft not listed in the table but that have the heater installed through other methods are still affected. This is a wide net.

Repetitive inspection interval. The AD sets two linked intervals: 100 hours aircraft TIS and 12 months calendar, whichever occurs first. This creates a binding calendar constraint even for aircraft that are flown rarely or stored for part of the year. For an aircraft that flies 50 hours per year, the 12-month limit will always trigger the inspection before the 100-hour limit. The first inspection must be performed within 25 hours TIS after the effective date unless a prior inspection within 75 hours TIS has been documented. The use of “aircraft TIS” rather than “heater TIS” means that any flight time counts, even if the heater was not in use.

Alternative method of compliance. The directive permits the operator to disable the heater rather than inspect and replace valves. The disabling procedure is set out in six numbered steps and requires a placard. The placard must read “System Inoperative” and be installed at the heater control valve within the pilot’s clear view. The disabled heater cannot be used until the full inspection and replacement procedure of requirements 1 through 4 is completed. This alternative is available “subject to the Minimum Equipment List (MEL) requirements or Permissible Unserviceabilities (PU) as per provisions of CAR 37 if applicable”. That means if the aircraft operates under an MEL that lists the heater as optional, or if CAR 37 permits the unserviceability, the heater can remain disabled. In practice, many general aviation aircraft flying under Part 91 (private operations) do not have an MEL; for them, the Permissible Unserviceability provisions of CAR 37 would apply. This creates an additional regulatory check before choosing the disablement route.

Log book entry. After each satisfactory inspection (no leak found), the operator must make an entry in the aircraft log book recording the date of inspection. This is a record-keeping requirement. The earlier amendment had also required marking the valve cover, but that was deleted as not feasible because of the repetitive nature.

The directive directly affects the owners, operators, and maintainers of any aircraft that is equipped with a Kelly Aerospace B-Series combustion heater (B1500, B2030, B2500, B3040, B3500, B4050, or B4500) and one of the specified fuel regulator shutoff valves. This includes aircraft originally manufactured by Bombardier (CL-215, CL-215T, CL-415), Cessna (208, T303, 310F through 310Q, 320C through 320F, 337 Series, 340/A, 414/A, 421, 421A/B/C), Piper (PA-23 Series, PA-30, PA-31 Series, PA-34 Series, PA-39, PA-44 Series), and Raytheon (95-B55 Series, 58, 58TC, 58P, 60, A60, 76). However, the directive explicitly states that aircraft not on this list that have the heater installed through other methods are still affected. This is a significant catch-all provision: any supplemental type certificate (STC) or field approval that installed a B-Series heater in a model not listed brings that aircraft within scope. Given the age of these heaters (B-Series heaters date back to at least the 1960s), many aircraft in the general aviation fleet could be affected, particularly in regions where cabin heat is essential. The directive also extends to aircraft registered outside Australia if they are operated under an Australian Certificate of Airworthiness or subject to CASA jurisdiction (for instance, if operated by an Australian operator or imported under the Australian register). The directive does not explicitly limit its applicability to Australian-registered aircraft, but as a CASA AD it is legally binding only on aircraft subject to the Civil Aviation Regulations. In practice, this means any aircraft on the Australian register with the affected heater.

The directive affects maintenance organisations (MROs) and individual licensed aircraft maintenance engineers who perform inspections and replacements. They must have access to the current KAPS Service Bulletin and any later FAA approved revisions, as well as the Piper Vendor Service Publication VSP-150 (for the PA-31-350 replacement). The directive also affects parts suppliers and distributors who sell replacement valves: they cannot sell a valve with a date code earlier than 02/02 for installation on any aircraft covered by the AD, even if the valve is new old stock. The cost of compliance is borne by the aircraft owner, not by CASA or Kelly Aerospace. For an aircraft with a heater that is rarely used, the owner must decide whether to undertake the recurring inspections or to disable the heater permanently. The disablement option itself requires labour and documentation, and if the aircraft is used for operations that require cabin heat (e.g., charter or air ambulance), disablement may not be viable, forcing the owner into the recurring inspection and potential replacement cycle.

The directive also indirectly affects insurance providers, who may require proof of AD compliance to maintain coverage. It affects aircraft buyers and sellers: a pre-purchase inspection should verify AD compliance, and a log book showing the valve was replaced with a post-02/02 part will increase resale value, while a disabled heater may reduce utility and therefore value.

The directive creates several clear duties and a limited set of rights.

Duty to inspect or pressure test. Every operator of an affected aircraft must, at the prescribed intervals, visually inspect or pressure test the fuel regulator shutoff valve for fuel leaks using the procedures in the KAPS Service Bulletin (or later FAA approved revisions). This duty is ongoing: it does not expire after a one-time compliance. The initial inspection must occur within 25 hours TIS after the effective date unless the operator can show a satisfactory inspection within the prior 75 hours TIS. Thereafter, the duty repeats every 100 hours TIS or 12 months, whichever is sooner.

Duty to make a log book entry. If no leak or stain is found during an inspection, the operator must make an entry in the aircraft log book recording the date. This is a separate obligation from the inspection itself. The entry must follow the procedures described in the KAPS Service Bulletin.

Duty to replace leaking valves. If any sign of fuel leak or fuel stain is found, the operator must replace the valve with a new valve of appropriate part number having a manufacturer’s date code of 02/02 or later. For Piper PA-31-350, the specific replacement part is P/N P23D04-7.5, not the older A23D04-7.5. The replacement must use the procedures in KAPS SB No. A-107A, Piper VSP-150 (for PA-31-350), and the applicable maintenance manuals.

Duty to only install new valves with post-02/02 date codes. This is a flat prohibition (requirement 4): after the effective date, no valve with a date code earlier than 02/02 may be installed. This applies even if the valve is brand old stock and has never been used. The duty is on the installer, but the operator must ensure compliance.

Duty to disable heater if choosing the alternative. If the operator opts to disable the heater, they must follow the six prescribed steps before the next required inspection under requirement 1. These steps include capping the fuel supply line upstream of the valve, disconnecting electrical power and securing connections, inspecting and testing to ensure the heater is disabled, ensuring no other aircraft system is affected, ensuring there are no fuel leaks, and fabricating and installing a placard reading “System Inoperative” at the heater control valve within the pilot’s clear view. The operator must also ensure that the disablement is permissible under any applicable MEL or CAR 37 provisions.

Rights. The operator has the right to choose between the inspection/replacement route and the heater disablement route. The operator may use any later FAA approved revision of the KAPS Service Bulletin, which could contain more efficient procedures. The operator may also apply for an Alternative Method of Compliance (AMOC) from CASA, though the directive does not explicitly grant a procedure; an AMOC could be sought if the operator can demonstrate an equivalent level of safety. The right to bring a disabled heater back into service exists, but it requires full compliance with requirements 1 through 4, meaning the valve may need to be replaced if it is pre-02/02.

The directive does not itself specify monetary penalties or criminal sanctions. Enforcement occurs through the broader framework of the Civil Aviation Act 1988 and the Civil Aviation Regulations 1988 (CARS). Operating an aircraft that does not comply with an applicable AD is a breach of the airworthiness requirements. Specifically, CAR 37 requires that an aircraft must be maintained in an airworthy condition; non-compliance with an AD would render the aircraft not airworthy. Operating or permitting the operation of a non-airworthy aircraft can result in the suspension or cancellation of the aircraft’s Certificate of Airworthiness. It can also lead to the suspension of a pilot’s licence or an operator’s Air Operator’s Certificate (AOC). Civil penalties under the Civil Aviation Act 1988 can be imposed by CASA, with fines for individuals up to $13,750 per contravention (indexed), and for bodies corporate up to $68,750 per contravention (indexed), as of 2025 rates. Continued non-compliance could also lead to prosecution for an offence under section 20AA of the Civil Aviation Act 1988, which carries higher penalties.

In practice, CASA enforcement is risk-based. Non-compliance with a fuel-leak AD is high risk because fuel leakage can lead to fire. Therefore, inspectors encountering an aircraft that has not had the required inspection are likely to issue a direction to ground the aircraft until compliance is achieved. If evidence of past non-compliance emerges (e.g., log book shows no entries since 2005), CASA may pursue retrospective enforcement, particularly if the aircraft has been operating in that state. The directive does not grant any grace period for discovery; the 25-hour and 100-hour/12-month limits are strict.

For maintenance organisations, performing an inspection that does not conform to the KAPS Service Bulletin or failing to make the required log book entry could lead to disciplinary action against the maintenance engineer’s licence under CAR 269 (suspension or cancellation) or the organisation’s approval under Part 145 of CASR (now Part 145 of the 1998 Regulations). There is also potential civil liability: if an accident results from a leak that would have been caught by compliance, the operator and the maintenance engineer could face negligence claims.

The directive itself does not contain any penalty provisions; it is the underlying legislation that provides the teeth. However, the directive’s status as an AD means it is not optional. The courts have consistently held that AD compliance is a fundamental requirement for airworthiness. Non-compliance cannot be justified by economic hardship, inconvenience, or rarity of the defect.

The directive is issued under the Civil Aviation Regulations 1988 (CAR), specifically CAR 37 which deals with airworthiness directives. CAR 37 gives CASA the power to issue directives where an unsafe condition exists in an aircraft, engine, propeller, or appliance. The directive must be complied with within the prescribed time. This AD therefore sits at the apex of the maintenance regulatory pyramid: it overrides any conflicting maintenance schedule or manufacturer’s recommendation. For example, an aircraft’s scheduled maintenance manual may not call for a 100-hour inspection of this valve, but the AD supersedes that.

The directive explicitly references the Minimum Equipment List (MEL) and Permissible Unserviceabilities (PU) under CAR 37. If an aircraft has an approved MEL that lists the cabin heater as inoperative, then the heater may be disabled without triggering a grounding. However, the AD adds an additional condition: the disablement must be done according to the six steps, and the placard must be installed. So even if the MEL would allow the heater to be inoperative without a placard, the AD requires one. For aircraft operating without an MEL (e.g., private operators under Part 91), CAR 37 provides Permissible Unserviceabilities. The operator must ensure that the disabled heater falls within those provisions, which generally require that the unserviceable item is not essential for safe operation and that the aircraft is placarded. The AD’s placard requirement aligns with but does not duplicate CAR 37.

The directive also references US FAA Airworthiness Directive 2004-25-16 R1 (Amendment 39-14076 dated 06 May 2005). This suggests that the unsafe condition was identified globally and that CASA’s action is harmonised with the FAA’s. In practice, aircraft imported from the US or operated under bilateral agreements would be subject to both directives, but compliance with one may be accepted by the other authority. The note in the AD states “US FAA Airworthiness Directive 2004-25-16 R1 Amendment 39-14076 dated 06 May 2005 refers.” It does not say that compliance with the US AD constitutes compliance with the CASA AD, but in practice, the procedures (KAPS SB) are identical, so doing the work under either directive should satisfy both. However, the CASA AD contains specific part number replacement instructions for the Piper PA-31-350 that may not be in the FAA version, so an operator relying solely on the FAA AD could be non-compliant with CASA’s version.

The directive interacts with maintenance record requirements under CAR 41 and CAR 42, which require that all maintenance be documented in the aircraft log book. The AD’s requirement for a log book entry after each satisfactory inspection is consistent with those regulations. The AD also interacts with Parts 145 (maintenance organisations) and 66 (licensing) of the Civil Aviation Safety Regulations 1998 (CASR), which now apply to most general aviation maintenance. A licensed engineer performing the inspection must hold the appropriate category and have access to the current data.

Finally, the directive interacts with contractual obligations: operators who lease aircraft to others must ensure AD compliance; otherwise they may be in breach of the lease. Similarly, a buyer of an aircraft has a right to expect that all ADs are complied with, and a seller may be liable for non-disclosure of non-compliance.

The directive is Amendment 3, and the document provides a summary of its predecessor versions.

Original issue: Effective 1 November 2001. This was the first CASA AD addressing fuel leaks in Kelly Aerospace (then Janitrol) fuel regulator shutoff valves. The original AD likely required the same inspection and replacement actions but may have been less refined in terms of procedures and compliance intervals. The original AD’s content is not reproduced in the source, but we know it was the first regulatory response to the fuel leak reports.

Amendment 1: Effective 12 January 2005. The source describes Amendment 1 only by its effective date; no substantive changes are listed. It presumably updated the applicable service bulletin reference or compliance times, or perhaps added the Piper PA-31-350 replacement instruction.

Amendment 2: Effective 14 April 2005. This amendment required marking of the valve cover after each satisfactory inspection (i.e., when no leak was found). The background explains that the repetitive nature of the inspection made this marking requirement “not feasible”, so Amendment 3 deletes it. Amendment 2 also provided clarification relating to the disabling of the heater. Since the AD was first issued in 2001 and Amendment 2 came only in April 2005, the valve cover marking requirement was in effect for a very short period (less than three months) before being removed.

Amendment 3: Effective 7 July 2005. This is the current version. It deletes the valve cover marking requirement but retains the log book entry requirement. It also incorporates the background noting that there are continued reports of fuel leakage, which is why the directive remains in place. The effective date of the amendment is 7 July 2005. The compliance schedule for the initial inspection applies from that date: the initial 25-hour TIS clock starts on 7 July 2005. Operators who had performed an inspection in the preceding 75 hours TIS (i.e., approximately since early April 2005 depending on flight hours) can reset the clock.

The amendment history shows that CASA is responsive to operational feedback: the valve cover marking requirement was recognised as impractical and removed quickly. However, it also demonstrates that the underlying unsafe condition persists, requiring continued mandatory action rather than a one-time fix. The fact that the directive has been through three amendments in less than four years suggests the complexity of both the mechanical issue and the regulatory response.

No litigation is mentioned in the source. It is not uncommon for airworthiness directives to face legal challenge only if an operator disputes the validity of the directive or the basis for the unsafe condition finding. However, the source does not refer to any court case, tribunal decision, or appeal. The absence of mentioned litigation could indicate that operators have generally complied, or that any disputes were resolved informally. It may also be that the directive’s narrow scope (specific valves on a subset of aircraft) has not generated the kind of widespread economic impact that would prompt a legal challenge. The directive itself does not reference any administrative review process. An operator aggrieved by the directive could, under the Administrative Appeals Tribunal Act 1975, seek review of CASA’s decision to issue the AD, but that would require grounds such as procedural error or unreasonable factual basis. Given that the AD cites “continued reports of fuel leakage” and that the FAA had issued a similar directive, any challenge would face a high hurdle.

From a free-market perspective, the lack of litigation suggests that the compliance cost, while real, has not been high enough to justify the expense of a legal challenge, or that operators accept the directive as reasonable. It may also be that the alternative of disabling the heater provides a low-cost escape valve for operators who find the inspection burden excessive.

Several features of this directive can trap unwary operators.

The 75-hour lookback. The initial inspection is due within 25 hours TIS after 7 July 2005, unless a satisfactory inspection was accomplished within the previous 75 hours TIS. That means an operator who did an inspection on 5 April 2005 (about 90 days before the effective date) would have to do it again only if the aircraft accumulated more than 75 hours between that inspection and the effective date. But if the aircraft flew only 50 hours in that period, the operator can defer the initial inspection until 25 hours after 7 July 2005. However, the log book entry must still be made. Many operators may overlook this nuance and either perform an unnecessary early inspection or miss the deadline if they miscalculate hours.

Aircraft not on the list are still affected. Note 2 states that “Aircraft not on this list that have the heater installed through other methods are still affected by this AD.” This is a broad catch-all. An operator of a Grumman, Beechcraft, or Mooney model not listed but fitted with a B-Series heater via an STC is caught. The table lists only Bombardier, Cessna, Piper, and Raytheon. If an aircraft has a B-Series heater from a supplemental type certificate (STC), it is affected even though the manufacturer and model are not in the table. This could easily be overlooked during a pre-purchase inspection if the inspector relies only on the table.

The alternative disablement must be done before the next required inspection. Requirement 5 says: “If you choose this option, you must do it before the next required inspection specified in requirement 1 of this AD.” This means if the aircraft is already overdue for an inspection, the operator cannot delay the disablement; they must do it immediately. Also, if the operator has already missed an inspection and decides to disable, they must still account for the missing log book entries for past due inspections. The AD does not forgive past non-compliance; it only provides a path for future compliance.

Bringing the heater back into service. The AD says: “To bring the heater back into service, you must do the actions specified in requirement 1 to 4 of this AD.” This means the operator cannot simply reverse the disablement steps; they must actually perform the inspection (and replacement if needed) regardless of whether the heater has been disabled. This prevents an operator from disabling the heater to avoid a replacement, then later enabling it without buying a new valve. For an aircraft that was disabled for years, the valve might still be the pre-02/02 part, requiring replacement before re-entry into service.

The placard requirement is specific. The placard must read exactly “System Inoperative” and be installed at the heater control valve within the pilot’s clear view. A placard that says “Inop” or “Not Available” does not comply. Also, the placard must be at the heater control, not just on the instrument panel. This may require physical access to the heater area.

The prohibition on old valves is absolute. Requirement 4 states: “Only install a fuel regulator shutoff valve with a manufacture date code of 02/02 or later.” This means any valve with a date code of 01/02 or earlier cannot be installed, even if it has never been used. This could lead to the scrapping of otherwise serviceable parts, imposing a loss on parts suppliers and owners.

Compliance intervals are tied to aircraft TIS, not heater TIS. The 100-hour limit runs on total aircraft time in service, regardless of whether the heater was used. An aircraft parked for maintenance with high TIS could still trigger the inspection even if the heater was not operating.

The AD does not provide for record retention beyond the log book entry. It requires a log entry after each inspection, but does not say how long to keep the entry. However, general maintenance regulation requires permanent retention.

Compliance requires a systematic approach. The following steps assume the operator wishes to continue using the heater. If the operator prefers to disable, see the alternative route.

Step 1: Determine applicability. Check whether the aircraft has a Kelly Aerospace B-Series combustion heater (models B1500, B2030, B2500, B3040, B3500, B4050, or B4500) and one of the listed fuel regulator shutoff valve part numbers (14D11, A14D11, B14D11, C14D11, 23D04, A23D04, B23D04, C23D04, P23D04). If the heater is present but the valve part number is unknown, determine it from the aircraft maintenance records or by physical inspection. If the aircraft model is not in the AD’s table, check whether the heater was installed via an STC or field approval; if so, the AD applies.

Step 2: Calculate the initial compliance deadline. Determine the total aircraft time in service (TIS) as at 7 July 2005. If a satisfactory inspection was performed within the preceding 75 hours TIS, the initial inspection is due within 25 hours TIS after 7 July. If not, the initial inspection is due within 25 hours TIS after 7 July. Record the deadline in hours TIS (which may be a future calendar date depending on utilisation). Note that if the aircraft is not flown for long periods, the 12-month calendar limit will apply to subsequent inspections but not to the initial one (which is solely hour-limited).

Step 3: Obtain the required technical data. The primary reference is KAPS Service Bulletin No. A-107A dated 06 September 2002 (or a later FAA approved revision). Also obtain Piper Vendor Service Publication VSP-150 dated 31 January 2003 (or later revision) if the aircraft is a Piper PA-31-350. The AD also mentions “the applicable maintenance manuals” for the replacement procedure. Ensure you have the current versions.

Step 4: Perform the inspection. Use either a visual inspection for fuel stains or a pressure test, as described in the Service Bulletin. The source does not specify which method is mandatory; both are permitted. Choose based on available equipment and best engineering judgment. A pressure test may be more reliable but requires special equipment. The choice affects cost and time.

Step 5: Document the result. If no leak or stain is found, make an entry in the aircraft log book with the date of inspection. The entry should reference the AD number (AD/AIRCON/13 Amdt 3) and the Service Bulletin used. If a leak or stain is found, proceed to Step 6; do not fly the aircraft until the valve is replaced.

Step 6: Replace leaking valve. Obtain a new valve of the correct part number with a manufacturer’s date code of 02/02 or later. For Piper PA-31-350, use P/N P23D04-7.5. Install per the Service Bulletin and the applicable maintenance manual. After replacement, ensure the old valve is properly disposed of and cannot be reused. Make a log book entry recording the replacement.

Step 7: Schedule future inspections. Set a reminder for the next inspection at 100 hours TIS or 12 months after the date of the last inspection, whichever is sooner. The repetitive interval applies from each inspection. The AD does not allow stretching the interval even if no problems have been found.

Alternative route: Disable the heater. If the operator chooses to disable, perform the following steps before the next required inspection (i.e., before the deadline calculated in Step 2): (i) Cap the fuel supply line upstream of the fuel regulator and shutoff valve. (ii) Disconnect the electrical power and ensure connections are secured to reduce spark risk. (iii) Inspect and test to confirm the heater system is disabled. (iv) Ensure no other aircraft system is affected. (v) Ensure there are no fuel leaks. (vi) Fabricate a placard reading “System Inoperative” and install it at the heater control valve within the pilot’s clear view. Also ensure that the disablement is permissible under any MEL or CAR 37 provisions. Record the disablement in the aircraft log book, referencing the AD. Then, if in the future the operator wishes to use the heater again, they must perform the full inspection and replacement routine of requirements 1 through 4, including possibly replacing the old valve with a post-02/02 part.