AD/ML-M5/12 - Elevator Controls

An airworthiness directive (AD) is a legally enforceable maintenance requirement issued under the Civil Aviation Act 1988 and associated regulations. It compels owners, operators, and maintainers of registered aircraft to perform a specific inspection, modification, or operational limitation by a deadline. Non-compliance renders the aircraft unairworthy and may result in enforcement action including grounding. This particular AD is designated AD/ML-M5/12 and forms part of a series specific to Maule ML-M5 models. The “ML” prefix suggests the AD series applies to that aircraft type. The number “12” indicates it is the twelfth AD issued for that series, though no prior ones are referenced in the source.

Elevator control rigging is a fundamental concept. The elevator is the movable horizontal surface at the tail that controls pitch (nose up or down). It is connected to the cockpit control yoke or stick by cables that run through pulleys and attach to control horns on the elevator surface. Correct rigging means that pulling the yoke back causes the elevator trailing edge to move up, which forces the tail down and the nose up. Reverse rigging - the opposite motion - would cause a pilot pulling back to experience a nose-down response, a catastrophic condition at low altitudes. The two accidents cited in the background are attributed to this error during maintenance. The colour coding and caution are designed to provide a visual and documentary barrier to this mistake.

Mandatory service bulletin (MSB) incorporation is another key concept. The AD does not reproduce the detailed painting instructions; it makes compliance with Maule MSB No. 30 mandatory and provides an alternative for the caution text insertion. A service bulletin is typically a manufacturer’s recommended action that is not automatically obligatory. By referencing it in an AD, CASA elevates the bulletin’s requirements to the level of law. Operators must ensure they have access to the correct version of the bulletin (dated 4 March 2008). Using an earlier or later version may not satisfy the AD.

The concept of an “FAA-approved maintenance program” is imported from US regulations. For Australian registered aircraft that were originally type-certificated in the United States, the FAA-approved maintenance program is typically the aircraft maintenance manual approved as part of the type certificate. CASA accepts that program as the basis for airworthiness. The AD requires the caution text to be inserted into the rigging procedure section of that program. If the Australian operator uses a CASA-approved maintenance schedule that does not mirror the FAA program, they must make the insertion into an equivalent document that the regulator recognises.

Finally, CAR 42G imposes additional constraints. This regulation governs maintenance of flight control systems, requiring that after any assembly, adjustment, repair, modification, or replacement, the system must be inspected and tested in accordance with the approved data. The painting of cable ends and horns may involve disconnecting the cables, thus triggering CAR 42G’s requirement to perform a full rigging check and functional test after reassembly. The AD’s caution text about checking elevator operation before flight after a cable reconnect echoes but does not replace the CAR 42G obligations.

The primary affected group is the owners and operators of the six Maule M-5 model variants listed in the applicability table. This includes all serial numbers, so every aircraft of those models on the Australian register as of February 2009 is caught. The AD does not exempt aircraft that have previously had their elevator cables replaced or that are imported with a statement of compliance from the manufacturer. The obligation applies regardless of whether the aircraft is used for private pleasure, aerial work, or charter. There are no exceptions for aircraft that are not currently flying (e.g., under long-term storage) because the compliance trigger includes “next time the elevator control cable is disconnected for any reason” - that could occur during storage maintenance.

Licensed aircraft maintenance engineers (LAMEs) and approved maintenance organisations (AMOs) are directly affected because they will be the persons performing the colour coding and inserting the caution text. They must have access to the service bulletin and ensure the work is done correctly. The AD does not specify who can do the painting; generally, maintenance on flight controls must be carried out by or under the supervision of a LAME holding the appropriate category (likely B1.2 for piston-engine aeroplanes). The insertion of text into the maintenance manual may require the operator or the engineer to notify the CAMO (continuing airworthiness management organisation) or the person responsible for the aircraft’s maintenance data.

Importers and dealers who bring these Maule models into Australia after the effective date may also be affected. They must ensure the AD is complied with before the aircraft is placed on the register and operated. If the aircraft was previously operated in the US and had FAA AD 2008-24-02 complied with, the colour coding may already be done. However, the caution text insertion into the FAA-approved maintenance program is also required, and that may not have been done correctly if the Australian maintenance program differs from the US one. The operator must verify compliance and document it under the Australian framework.

The compliance burden falls disproportionately on small private owners who may lack ready access to the service bulletin or may not have the technical expertise to update the maintenance manual. They will need to engage an approved maintenance organisation, incurring labour and material costs that may be modest but are still a deadweight cost imposed by regulation. The AD also affects the availability of aircraft for hire or rental; if the AD is not complied with by the deadline, the aircraft cannot legally be flown. This could disrupt operations for flying schools or clubs that operate Maule M-5 models. For commercial operators, the 12-month window provides flexibility to schedule the work during routine maintenance, reducing the cost impact. But the “whichever occurs first” phrase creates risk: if an unscheduled cable disconnect happens three months after the AD, compliance is due immediately.

Parties indirectly affected include insurance companies, which may void coverage if the aircraft is operated without an airworthiness directive being complied with. Buyers of used aircraft should check that the AD is recorded in the aircraft logbooks; an aircraft without AD compliance is technically unairworthy and may have a lower resale value. The AD also affects the Federal Court and CASA enforcement resources if non-compliance is detected.

The AD imposes four identifiable duties on the owner and operator of each affected aeroplane. First, the duty to obtain and follow Maule Aerospace Technology, Inc. Mandatory Service Bulletin No. 30 dated 4 March 2008. This means the operator must have a copy of that bulletin in the maintenance library or be able to demonstrate access to it. The duty extends to performing the colour coding exactly as specified in the bulletin - using yellow enamel paint and applying it to the four specific locations: the top of the rear elevator control horn, the cable end attached to that horn, the bottom of the forward elevator control horn, and the cable end attached to that horn. The AD does not allow latitude in paint colour; yellow enamel is mandatory.

Second, the duty to insert the caution text into the rigging procedure section of the FAA-approved maintenance program. This is a documentation obligation. The text must appear verbatim: “CAUTION - BEFORE FLIGHT WHENEVER ELEVATOR CABLES ARE RECONNECTED OR NEW CABLES INSTALLED: Always check operation of elevators after a cable reconnect by pulling back on the control and ascertain that the elevators are in the UP position.” The AD permits three alternative methods of insertion: copying the text directly, inserting a copy of the AD itself, or inserting the text from page 3 of the service bulletin. The operator must choose one and ensure the maintenance program is updated accordingly. If the maintenance program is in electronic format, the insertion must be properly entered and version-controlled.

Third, the duty to comply with the timing trigger: before the next elevator control cable disconnect for any reason or within 12 calendar months after 12 February 2009, whichever occurs first. This imposes a proactive monitoring obligation. The operator must track both time and events. If the aircraft undergoes any maintenance that involves disconnecting an elevator cable - even for an unrelated task like removing the empennage - the AD compliance must already have been completed. The AD does not allow a grace period after that accidental disconnect; compliance must be done before the disconnect, which effectively means the colour coding and text insertion must be in place prior to any future cable disconnect.

Fourth, an implied duty to record compliance in the aircraft maintenance records. Though not explicitly stated, the general regulation (Civil Aviation Regulation 42S or similar) requires that all maintenance performed, including AD compliance, be recorded. The record should include the AD number, compliance method, date, and signature or identification of the person who did the work. If the caution text insertion was done, this may also need to be recorded as a revision to the maintenance program.

The rights of the operator are limited. They have the right to choose which of the three caution insertion methods to use. They may also choose to perform the colour coding earlier than required, at their convenience. There is an inherent right to apply for an alternative means of compliance under Civil Aviation Regulation 43A (not mentioned in the AD but generally available), though CASA would likely require that the alternative achieve equivalent safety. The operator has no right to delay compliance beyond the deadline. There is no right to fly the aircraft after the deadline without compliance; doing so would render the aircraft unairworthy and expose the pilot and owner to enforcement action.

The AD itself does not contain a penalty clause, but non-compliance triggers enforcement under the broader regulatory framework. Operating an aircraft that fails to comply with an applicable airworthiness directive is a breach of the Civil Aviation Act 1988 and the Civil Aviation Regulations 1988. The maximum penalty for an individual operating a non-airworthy aircraft can be significant. Under the current penalty unit regime (one penalty unit being $313 as of 2025, with periodic adjustments), a breach attracting 50 penalty units would be $15,650 for an individual, and higher for a body corporate. The exact penalty depends on the specific regulation contravened. For example, IFR 2020 regulations or old CAR 42S impose obligations to ensure maintenance is performed in accordance with approved data. If an AD is not complied with, the aircraft is not maintained as per approved data, so the operator is liable.

CASA has multiple enforcement tools. It can issue an infringement notice (on-the-spot fine), typically for minor breaches. For a serious or deliberate breach, CASA can suspend or cancel the aircraft’s certificate of airworthiness, making further flight illegal. It can also ground the aircraft individually with a direction under section 20BB of the Civil Aviation Act. If the non-compliance is discovered during a ramp check or a maintenance audit, CASA may require the aircraft to be grounded until the AD is complied with, causing operational disruption and cost. For repeat offenders or flagrant disregard, CASA can prosecute criminally, leading to court-imposed fines and potentially imprisonment for offences involving safety hazards.

The enforcement risk is heightened because flight control system rigging is a critical safety item. The AD itself notes two accidents from reversed rigging. A mechanic who intentionally ignores the colour coding and caution requirements could face personal liability under workplace safety laws as well, but the immediate regulator is CASA. The AD also cross-references CAR 42G, which imposes separate duties after flight control maintenance. Failure to comply with CAR 42G’s testing and inspection requirements could be a separate offence.

For the person performing the maintenance, there is also a potential exposure under the Civil Aviation Safety Regulations Part 145 or Part 66. If an AMO or LAME certifies the aircraft as airworthy without ensuring AD compliance, they may be in breach of their maintenance certification privileges. CASA can suspend or revoke their authorisation. Insurance implications are also punitive: if an accident occurs and it is found that the AD was not complied with, the insurer may deny coverage under a policy condition requiring compliance with all airworthiness directives. This could leave the owner and operator personally liable for damages and injury.

In practice, enforcement of this AD is likely to be reactive rather than proactive. CASA does not have the resources to inspect every Maule M-5’s elevator horns. Enforcement will typically occur during routine maintenance audits, aircraft resale inspections, or after an incident. The AD is now over 15 years old, so compliance is already built into accepted practice for most owners. However, if a new owner imports a Maule M-5 without verifying AD compliance, CASA would treat this as a serious oversight. The 12-month compliance deadline passed long ago, so any aircraft still not complied with is technically unairworthy, but the practical risk of enforcement decreases with time unless the aircraft is presented for a certificate of airworthiness renewal.

This airworthiness directive sits within a hierarchy of Australian aviation legislation. It is issued under the Civil Aviation Act 1988 and is a type of “direction” that has the force of law. It directly interacts with the Civil Aviation Regulations 1988 (CARs) and the Civil Aviation Safety Regulations 1998 (CASRs). Specifically, Note 1 within the AD reminds operators of CAR 42G. CAR 42G requires that if any part of the flight control system is assembled, adjusted, repaired, modified, or replaced in the course of carrying out maintenance, the person doing the work must ensure that the system is inspected and tested in accordance with the approved data. The painting of cable ends and horns may not require disassembly, but if the cables are disconnected to reach the horns, the act of disconnection and reconnection counts as an assembly or adjustment. Thus, after performing the colour coding, the engineer must perform a full rigging check and functional test as per the maintenance manual and CAR 42G.

The AD also references the FAA AD 2008-24-02. For aircraft imported from the United States, that FAA AD applies in the country of origin. CASA has a bilateral agreement allowing it to adopt FAA ADs directly or issue equivalent Australian ADs. Here, CASA issued its own AD rather than simply accepting the FAA AD, which means the Australian requirement may have subtle differences. For instance, the FAA AD may have a different compliance date or text insertion method. Operators must comply with the Australian AD, not the FAA AD, even if the aircraft also holds a US airworthiness certificate. Dual compliance might be necessary if the aircraft operates under both jurisdictions, but for Australian registered aircraft the CASA AD is the binding document.

The interaction with the maintenance manual approval system is significant. The AD requires insertion of the caution text into the “FAA-approved maintenance program.” For an Australian registered aircraft, the maintenance program is approved by CASA under Part 42 (for large aeroplanes) or Part 91 (for general aviation aircraft). The operator must ensure that the revision to the manual is made in accordance with the procedure for updating that manual. If the manual is submitted to CASA for acceptance, the insertion may need to be done as a formal revision. For aircraft operating under a CASA-approved maintenance schedule, the operator may need to notify their CAMO. Failure to properly document the manual change could be a separate regulatory breach.

The AD also interacts with the privileges of licensed engineers. Under Part 66 of CASRs, a LAME can only perform and certify maintenance if they hold the appropriate category and have the required experience with the aircraft type. The colour coding is straightforward, but if it involves disconnecting cables, the engineer must have that system endorsement. Work on flight controls generally requires a B1 or B2 license. A person without a license cannot legally certify the work. This increases the compliance cost for private owners who might wish to do the painting themselves; they could do it under the supervision of a LAME, but the LAME must still sign off.

Finally, the AD interacts with state and territory workplace health and safety laws. The use of yellow enamel paint involves hazardous chemicals; the engineer must comply with relevant WHS regulations regarding handling, ventilation, and disposal. This is not aviation-specific but is an additional compliance burden.

Based on the source document provided, AD/ML-M5/12 appears to be an original issue. The document is signed and dated 22 December 2008 and specifies an effective date of 12 February 2009. There is no indication within the text that this AD has been amended, superseded, or reissued in a later version. The AD number includes “2/2009” which likely means it is the second AD issued in the year 2009 for this series (or the second revision?), but the structure of the numbering is not explained in the source. The FAA equivalent AD referenced (2008-24-02) came into effect in November 2008, so the Australian AD was issued approximately a month and a half later, aligning with it.

It is common for airworthiness directives to be subsequently amended - for example, to extend compliance dates, change affected serial numbers, or add new requirements. However, the provided source does not contain any amendment history or list of revisions. The document as presented is a single page (with a reproduced table) and a signature block. There is no mention of any previous AD being superseded by this one, so it was likely the first mandatory requirement for this specific issue on these models.

Given the age of the AD (2008-2009), it is possible that CASA has since issued an updated directive that consolidates this requirement into a more comprehensive AD for the Maule M-5 series, or that the original AD has been absorbed into the maintenance program as an ongoing requirement. However, without a later document, we cannot confirm that. In practice, if this AD has never been repealed, it remains in effect. Owners and engineers should check the current AD listing on the CASA website to see if any subsequent amendment or cancellation notice exists. The absence of amendment history in the source does not guarantee that one does not exist elsewhere.

Because the AD is prescriptive and time-limited (the original 12-month compliance window expired in February 2010), it effectively becomes a continuing requirement. The colour coding must remain in place, and the caution text must remain in the manual. Any future cable disconnect still requires the checks mandated by the AD, but the painting itself is a one-off. The AD does not need amendment to continue to be enforceable; it simply requires ongoing adherence to the maintenance action. If later service bulletins or component changes make the colour coding obsolete, CASA would need to issue a superseding AD to remove or modify the requirement. No such supersession is documented in the source.

The source document does not reference any litigation, and there is no publicly known history of court challenges to AD/ML-M5/12 specifically. Airworthiness directives are regulatory instruments and can be challenged on grounds of procedural or substantive error under the Administrative Decisions (Judicial Review) Act 1977 or through an application to the Administrative Appeals Tribunal. However, challenges to ADs are rare because they involve safety matters where courts afford significant deference to the regulator’s technical expertise, and the cost of challenging a low-cost maintenance requirement generally outweighs any benefit.

The most plausible legal scenario is an operator disputing a CASA infringement notice or enforcement action for non-compliance. If an owner was fined for not having the colour coding, they could argue that the AD is unreasonable or that compliance was not required because the aircraft’s elevator cables had never been disconnected. But the AD is clear: compliance is required within 12 months or before the next cable disconnect, whichever is first. An owner who failed to comply before the 12-month deadline would likely lose that argument.

Another potential avenue is a dispute over the interpretation of the compliance trigger. For example, if a maintenance provider disconnected a cable without informing the owner that the AD was due, and then claimed the owner should have already complied, a court might apportion liability. But this would be a contractual dispute between the owner and the engineer, not a challenge to the AD itself.

There is no evidence that this AD has been litigated in the Federal Court or in any state court. The two accidents mentioned in the background may have led to civil litigation against the mechanics or the manufacturer, but that litigation is not part of the AD and would have been conducted under negligence or product liability law, not under aviation regulations.

The FAA AD counterpart in the US (2008-24-02) has also not generated notable litigation. The US National Transportation Safety Board may have mentioned the AD in accident reports, but that is investigatory, not litigious.

Overall, the litigation history for this AD is nonexistent. This is typical for minor airworthiness directives that impose low-cost, straightforward actions with clear safety justification. Operators generally comply rather than challenge. The absence of litigation does not suggest the AD is uncontroversial; rather, the cost-benefit calculus for a legal challenge is heavily skewed against the operator. They would risk legal fees, potential grounding, and reputational harm for the sake of avoiding a small paint job.

Several traps await the inattentive operator or engineer. The compliance trigger “before the next time the elevator control cable is disconnected for any reason or within the next 12 calendar months after the effective date, whichever occurs first” contains a hidden early compliance obligation. If the aircraft undergoes routine maintenance that involves disconnecting the elevator cable - for example, removing the tail for an annual inspection - before the 12-month window has elapsed, the AD compliance must already be in place. An owner who schedules the colour coding for the 12-month point may be caught out by an earlier disconnect. The “any reason” language includes disconnection for repairs, replacement, or even for access to adjacent systems. It does not matter that the disconnection is unrelated to the AD; the AD deems this event as a trigger for prior compliance.

The colour coding requires “yellow enamel paint.” Not all yellow paints are identical; using a different shade or type (e.g., acrylic instead of enamel) may not satisfy the AD. The paint must also be applied to the exact locations specified. An engineer who paints only the horns but not the cable ends, or vice versa, has not fully complied. The service bulletin should show the precise pattern; deviation is non-compliance.

The caution text insertion must be into the “rigging procedure section” of the FAA-approved maintenance program. If the maintenance program does not have a section explicitly titled “rigging procedure,” the operator must identify the most logical place (likely the elevator rigging subsection) and insert it there. Doing so without proper authorisation or without documenting the change could lead to a finding that the maintenance program is not current. For aircraft with electronic maintenance manuals, the insertion must be properly version-controlled and accessible to maintenance personnel. A simple note in the logbook may not suffice.

Another trap is the cross-reference to CAR 42G. The AD explicitly reminds operators of this requirement, meaning that the painting work is likely to trigger a full rigging check and functional test under CAR 42G. An engineer who only paints and then certifies the work without performing the required operational check may be in breach of CAR 42G, even if the AD itself appears satisfied. The caution text inserted into the manual must also be followed; a pilot who skips the pre-flight check could be violating that caution, though it is not a legal requirement in itself. But the manual insertion makes it an approved maintenance procedure.

For imported aircraft that already had the FAA AD complied with, there is a risk that the operator assumes the Australian AD is fully satisfied. But the caution text insertion in the FAA-approved maintenance program may not have been done in the context of the Australian maintenance program. If the Australian-approved maintenance program is a different document (e.g., a CASA-accepted schedule), the insertion must also be made there. Additionally, the colour coding must be verified; it may have been done but could have faded or been removed during subsequent repairs.

Finally, the AD does not explicitly require a logbook entry, but good maintenance practice demands it. An owner who performs the work but fails to record it has no documentary proof of compliance. During a sale or audit, the aircraft may be treated as non-compliant, forcing a repeat of the work. Also, if the aircraft is flown after the 12-month deadline without compliance, each flight is a potential regulatory breach. The AD has no sunset clause; it continues indefinitely.

A structured compliance plan ensures all AD requirements are met accurately and documented. The following steps are based on the source and standard maintenance practices.

Step 1: Confirm applicability. Verify that the aircraft is one of the six listed models (M-5-180C, M-5-200, M-5-210C, M-5-210TC, M-5-220C, or M-5-235C) with any serial number. Cross-check the aircraft registration against the CASA AD listing. This step is straightforward but must be completed before work begins.

Step 2: Obtain the mandatory service bulletin. Contact Maule Aerospace Technology, Inc. or a distributor for a copy of Mandatory Service Bulletin No. 30 dated 4 March 2008. If the bulletin is unavailable from the manufacturer, check the CASA website or the FAA document repository. Some operators may find the bulletin included in the AD document itself, but the source only references it. A physical or digital copy must be kept with the aircraft maintenance records.

Step 3: Schedule compliance with the timing trigger. Because the original 12-month deadline has long passed, any aircraft still not complied with is overdue. For a newly imported aircraft, compliance must be immediate. For an aircraft that has previously complied but perhaps the paint has faded or the manual text has been removed, re-compliance is required only if the AD requires it to be maintained. The AD does not state a recurring interval, so the colour coding is intended to be permanent. However, if the paint wears off, operational safety may be compromised, but the AD does not specify a reapplication schedule. Prudent maintenance practice is to check the paint condition during annual inspections.

Step 4: Perform the colour coding. Using yellow enamel paint (confirm the specific brand or type called out in the service bulletin), paint the four components: (a) the top of the rear elevator control horn, (b) the elevator control cable end attached to the top of the rear control horn, (c) the bottom of the forward elevator control horn, and (d) the elevator control cable end attached to the bottom of the forward control horn. If the cable ends are not accessible without disconnecting them, the engineer must disconnect the cables, clean the surfaces, apply paint, allow it to dry, and then reconnect. Note that disconnection triggers CAR 42G requirements for subsequent rigging checks. After painting, visually inspect that the paint is applied to the correct faces and is clearly visible.

Step 5: Insert the caution text into the maintenance program. Locate the rigging procedure section of the FAA-approved maintenance program. If none exists, the operator may need to create a new section or add it to the elevator rigging subsection. Use one of the three allowed methods: (i) type the exact caution text in full, (ii) insert a copy of the AD, or (ii) insert the text from page 3 of the service bulletin. If the maintenance program is a printed manual, make the insertion and mark it as a temporary or permanent revision. If electronic, update the file and ensure all personnel have access to the revised version. Document the revision number and date in the maintenance records.

Step 6: Perform the required rigging check and functional test under CAR 42G. Because the AD reminds operators of CAR 42G, after the cables are reconnected, the engineer must perform an operational check of the elevator control system. This involves moving the yoke or stick through full travel and verifying that the elevator moves in the correct direction (pulling back = up) and that there is no binding or slop. A corrective adjustment may be needed. Record the results in the logbook.

Step 7: Document compliance in the aircraft maintenance records. Create an entry referencing AD/ML-M5/12, the date complied, a statement that the colour coding was applied per Service Bulletin No. 30, and that the caution text was inserted into the FAA-approved maintenance program (specify the manual revision). The entry should be signed by the certifying LAME or the person responsible for the maintenance program update. Keep a copy of the AD and service bulletin in the aircraft logbook or permanent records.

Step 8: Brief maintenance personnel and pilots. Ensure that anyone who will perform future maintenance on the elevator system is aware of the colour coding and the caution text. The pre-flight check mentioned in the caution should be incorporated into the standard pre-flight inspection. If cables are ever disconnected again, verify that the colour coding is intact and that the caution is still in the manual.

Step 9: For ongoing compliance, periodically inspect the paint during routine maintenance. If it fades or chips, the operator should repaint it voluntarily to maintain the safety intent. While the AD does not require re-inspection, neglect could expose the operator to enforcement if an inspector notes the missing paint. The caution text in the manual must remain in every version of the manual. If the manual is replaced, the caution must be re-inserted.