AD/ELECT/74 Amdt 1 - Lermer GmbH Water Boilers

Airworthiness Directive (AD) A mandatory notice issued by CASA under the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations (CASR), requiring inspection, modification, or replacement of aircraft components that present a potential unsafe condition. Non-compliance renders the aircraft not airworthy and may lead to grounding or enforcement action. This AD is an amendment to an earlier AD, meaning it inherits the original compliance dates and technical actions.

Affected water boilers The directive defines a discrete population of Lermer (now Driessen) water boilers by part and type number. It also provides exclusions for units that have already been marked as compliant with the original French DGAC AD or with the listed Airbus Service Bulletins. This exclusion avoids double scrutiny of already compliant units and reduces compliance burden for operators who have already acted.

Logo identification as a compliance filter The AD uses the manufacturer logo (old Lermer versus new Driessen) as a quick triage mechanism. The implicit logic is that water boilers bearing the new Driessen logo already incorporate the corrected electrical circuit design, so no further inspection is required. This is a pragmatic approach to avoid unnecessary disassembly and manual inspection for units that are already safe. However, it places reliance on the manufacturer's branding history and assumes that logo change corresponds to design change, which may not be verifiable from the source alone. An operator in doubt would need to consult the CMM or the manufacturer.

Overheat protection inspection The core technical requirement is an inspection of the overheat protection circuit. The threshold is the number of electrical terminals connected to the overheat protector. The source does not explain why four terminals are the dividing line, but the CMM likely specifies the design standard for a properly configured circuit. The significance is that a water boiler with fewer than four terminals is deemed incapable of providing adequate overheat protection under the failure conditions described (relay contact sticking). This is a binary pass/fail test based on a physical count, not a functional test. An operator or maintainer cannot simply repair a three-terminal unit; it must be scrapped.

Acceptable means of compliance The AD does not dictate the exact method of achieving compliance. It permits embodiment of the relevant Airbus Service Bulletin as an alternative to the individual inspection and engraving process. This is consequential for operators who prefer to follow the aircraft manufacturer's approved maintenance instructions rather than the equipment manufacturer's CMM. It also means that an operator who has already embodied the applicable SB before the AD's effective date is automatically compliant, provided the SB was correctly embodied.

Compliance status marking The engraving requirement serves as a physical record of compliance, visible on the water boiler itself. This reduces reliance on paper records and allows quick identification during subsequent maintenance or transfer of the component to another aircraft. The engraving must be adjacent to the existing equipment label. The directive does not specify a font size, depth, or method, leaving that to the maintainer's judgment within good engineering practice.

The primary class of persons affected are operators and maintenance organisations of Airbus A300, A310, A300-600, A318, A319, A320, A321, A330, and A340 series aeroplanes. The AD applies to any aeroplane on the Australian register or operated in Australian territory under CASA’s jurisdiction. However, because the directive references French DGAC AD F-2004-132, it likely reflects a global safety issue affecting operators worldwide. CASA’s adoption of the directive as an amendment means the requirement extends to any aircraft for which CASA is the responsible airworthiness authority. This includes Australian registered aircraft, foreign aircraft operated by Australian operators under an Australian air operator’s certificate, and aircraft undergoing maintenance or import into Australia.

Within the airline or operator organisation, the responsible persons include:

• maintenance engineers and technicians who perform the physical inspection and engraving or replacement;
• certifying engineers who sign off the maintenance release;
• engineering managers who track AD compliance status and maintain the AD register;
• continuing airworthiness management organisations (CAMOs) that hold the operator’s airworthiness management functions;
• lessors and owners who are responsible for ensuring the aircraft is delivered in compliance with all applicable ADs before lease or sale.

Third-party maintenance providers, including MRO facilities, are also affected because they may be contracted to perform the AD action. They must ensure their staff have access to the applicable CMM and the Airbus Service Bulletins, and that the necessary engraving tools and replacement water boilers are available.

The directive also indirectly affects the manufacturer, Driessen (formerly Lermer GmbH), and any downstream suppliers of replacement water boilers. Since the AD requires scrapping of units with fewer than four terminals, there is a demand for airworthy replacement units, which may drive aftermarket pricing. It also affects any secondary market for used water boilers: a seller must ensure that any component sold bears the correct compliance marking, otherwise the buyer must assume it is non-compliant and either inspect and mark it or scrap it.

Passengers and crew are the ultimate beneficiaries of the safety improvement, but the AD does not impose any duties on them. The directive does not apply to foreign operators transiting Australian airspace without landing or engaging in Australian aviation activities, though practical effects could arise if an aircraft grounded for maintenance at an Australian airport had an non-compliant unit. CASA’s enforcement discretion would likely focus on Australian operators first, but a foreign aircraft that remains in Australia for an extended period might be brought within scope.

Duty to inspect and identify Any person who performs an inspection on an aircraft that may contain an affected water boiler has a duty to correctly identify the water boiler by part number or type number and by manufacturer logo. This duty arises whenever the aircraft undergoes maintenance that provides access to the water boiler, or if the operator otherwise becomes aware of the presence of a non-compliant unit. The AD does not specify a deadline after the effective date; it reasserts the original compliance date of 31 December 2004, meaning any aircraft that has not already complied must have it done upon discovery.

Duty to inspect overheat protection If the water boiler bears the old Lermer logo, the overheat protection must be inspected in accordance with Lermer GmbH CMM 25-30-31 page block 300. This duty includes obtaining the current revision of the CMM, performing the inspection correctly, and documenting the results. Failure to follow the CMM procedure could result in improper assessment and a non-compliant component being returned to service.

Duty to engrave compliance marking If the water boiler has four or more electrical terminals connected to the overheat protector, the person performing the inspection must engrave ‘Complies with AD F-2004-132’ adjacent to the equipment label. The AD does not designate a specific engraving method (e.g., electric engraver, chemical etching), but the marking must be legible and permanent. The marking is a record of compliance and a safety-critical identifier; a defective or illegible marking could later cause confusion.

Duty to scrap and replace if fewer than four terminals If the water boiler has fewer than four terminals, it must be scrapped and replaced with an airworthy one. This duty is absolute: there is no allowance for repair, re-wiring, or adding terminals. The affected unit cannot be returned to service in any form. This imposes a direct cost on the operator for a replacement water boiler and the labour for removal and installation. It also may cause aircraft downtime if a spare is not readily available.

Right to use alternative means of compliance The AD expressly states that embodiment of the applicable Airbus Service Bulletin (SB) is considered an acceptable means of compliance for the requirement. An operator may choose to incorporate the SB instead of performing the individual inspection and engraving. This right is important for operators who already have approved procedures based on the SB, or who prefer a manufacturer-approved modification over a component-level inspection. However, the SB is applicable only to Airbus aeroplanes; the directive does not extend this alternative to other aircraft types listed in Note 1. An operator with, for example, a Boeing aircraft (if any) carrying an affected water boiler would need to rely on the primary compliance path.

Right to rely on prior compliance markings Affected water boilers that have already been engraved with an Airbus SB number or the words ‘Complies with AD F-2004-132’ are excluded from the scope of the AD. An operator who acquires a used water boiler bearing such a marking does not need to repeat the inspection. However, the operator must verify that the marking is genuine and corresponds to the applicable SB for the aircraft type. There is an implicit obligation to check that the marking is not fraudulent or incorrectly applied.

The AD itself does not prescribe specific penalties. Enforcement flows from the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations (CASR). Operating an aircraft that does not comply with an applicable AD is a breach of the airworthiness requirements. The maximum penalties under the Act include civil penalties of up to 60 penalty units for an individual and 300 penalty units for a body corporate (as at 2023, one penalty unit is AUD 313; these amounts are index-linked). In addition, a failure to comply with a condition of an airworthiness certificate or maintenance release can lead to suspension or cancellation of certificates and authorisations. CASA also has the power to issue a direction to ground the aircraft or restrict its operations until compliance is achieved.

For a maintenance organisation or certifying engineer, signing off an aircraft as airworthy when it has a non-compliant water boiler constitutes a serious breach of the maintenance regulations. This could lead to suspension or revocation of the organisation’s Part 145 approval or the individual’s LAME (Licensed Aircraft Maintenance Engineer) licence. It may also expose the organisation to civil liability for any damage caused by a subsequent failure, although liability is a matter of tort law rather than the AD itself.

Enforcement is risk-based. An operator who discovers a non-compliant water boiler during a routine inspection and promptly installs a compliant unit is likely to face no more than a caution or a notice of non-compliance. A operator who knowingly operates an aircraft with an non-compliant unit after the compliance date, or who fails to correct a non-compliance brought to their attention, invites enforcement action. The 2014 amendment, which corrected only a typo, may reduce the risk that a court or tribunal could find uncertainty in the original reference.

There is no private right of action under the AD. Only CASA can enforce it. Passengers or third parties who suffer injury from a failed water boiler could rely on the AD as evidence of a standard of care in a negligence action, but the AD itself does not create a statutory cause of action. That said, compliance with the AD may be a defence to a claim of negligent maintenance, while non-compliance would strongly support an allegation of breach of duty of care.

Given the compliance date is now nearly 20 years past, the realistic enforcement scenario is during an audit or a maintenance check where the water boiler is identified as originally listed. If the compliance marking is missing or the unit has fewer than four terminals, the aircraft is immediately non-airworthy. The operator must rectify before further flight. An inspector discovering such a unit may issue a defect report and require corrective action before release to service.

DGAC AD F-2004-132 The French DGAC issued AD F-2004-132 addressing the same unsafe condition. CASA’s AD is substantively identical, with the correction being the reference number originally cited. Operators of French-registered aircraft or aircraft under DGAC’s jurisdiction must comply with the French AD. For an aircraft that later enters the Australian register, CASA’s AD applies. The wording of the Australian AD accepts prior compliance with DGAC AD F-2004-132 as full compliance with the Australian directive (the water boiler must be engraved with that number). This avoids duplication for operators who have already complied in another jurisdiction.

Airbus Service Bulletins The AD lists six specific Airbus SBs as acceptable means of compliance. These SBs describe a modification or inspection procedure approved by the aircraft manufacturer. The relationship is hierarchical: the AD overrides the non-mandatory SB status, turning a recommended action into a mandatory one. However, the AD does not supersede the SB; it cross-references it. An operator who follows the SB may record the SB number instead of the AD engraving, provided the SB is correctly embodied. The SB itself may require additional steps not mentioned in the AD (e.g., parts replacement, testing). The operator must comply with the entire SB, not just the parts that satisfy the AD.

Aircraft Maintenance Manual (AMM) The AD requires the maintainer to gain access to the water boiler in accordance with the applicable AMM. This is the standard method for component access. The AD does not override the AMM; it relies on it for the safe removal and installation of the water boiler. The AD also refers to the Lermer CMM for the overheat protection inspection. The CMM is a maintenance document for the component itself, not the aircraft. Multiple documents govern the same task: the AMM for access, the CMM for the inspection, and the AD for the decision logic and engraving requirement. The maintainer must hold all three documents and follow each where applicable. The AD is the highest priority because it is mandatory.

Civil Aviation Act and CASR The AD is made by a delegate of CASA under the powers in the Act. It has the force of law. The AD interacts with regulation 42.330 of CASR (or equivalent older provisions for aircraft under the transitional arrangements), which require the operator to comply with ADs as a condition of airworthiness. The AD also interacts with the maintenance regulations that govern release to service, record keeping, and retention of compliance evidence. The engraving requirement is an additional marking beyond standard part marking; the AD does not conflict with other marking regulations but adds to them.

International obligations Australia is a member of the International Civil Aviation Organization (ICAO). Standardised AD procedures exist to avoid duplication and promote global uniformity. The fact that CASA adopted a French AD with a correction reflects the interconnected nature of aviation safety regulation. Operators with multilingual fleets must track AD compliance across multiple jurisdictions. This AD reduces the burden for Australian operators by providing a single domestic reference point.

The original AD/ELECT/74 was issued by CASA on 5 August 2004. It mandated the inspection of Lermer water boilers before 31 December 2004. The original source document likely had a typographical error in Note 2, which referenced the DGAC AD as “F-2004-132”. The amendment issued on 28 April 2014, with an effective date of 5 May 2014, corrects that typographical error. The text of the amendment states: “CASA issued AD/ELECT/74 Amdt 1 to correct a typographical error in the DGAC AD number referenced in Note 2 of this AD. There are no changes to the technical requirements of the AD and the dates for compliance remain unchanged.”

This means the original AD’s substantive action (inspection, engraving, or scrapping) remains exactly as originally mandated. The only change is that the note now correctly names the DGAC AD number. For an operator who already complied with the original AD, this amendment has no practical impact; the compliance marking, the inspection criteria, and the acceptable means of compliance are all identical. For an operator who had a potential dispute over whether the original note’s error created ambiguity - for example, if they thought they were complying with a different French AD - the amendment resolves that ambiguity retroactively, confirming that the intended reference was always AD F-2004-132.

The amendment history is relatively sparse, but it is significant because it shows that CASA considered the correction important enough to issue an amendment nine years after the original directive. This could indicate that CASA or industry identified the error during audits or cross-referencing, and that the error created a mismatch between Australian and French compliance records. The update brings the Australian AD into precise alignment with the French source. No further amendments have occurred.

The amendment also demonstrates how AD management works: even after the compliance date has passed, corrections can be made to the legal instrument itself. The amendment does not reopen the compliance window; it merely perfects the existing requirement. For an aircraft that was never inspected under the original AD, the amendment provides a clearer path to compliance because the cross-reference is now accurate.

There is no mention of any litigation arising from AD/ELECT/74 or its amendment in the source document. Given the narrow scope and the historical compliance date, it is unlikely that disputes have reached a courtroom. ADs are typically enforced through administrative action rather than litigation. If a dispute arose, it would likely concern whether the AD applied to a particular water boiler or whether an alternative means of compliance was acceptable. But the source does not identify any such proceedings.

An operator or maintainer challenging an enforcement decision could argue that the original AD’s typographical error rendered it invalid or uncertain. CASA’s amendment would have mooted that argument at least from the effective date of the amendment. An argument that the AD was invalid before the amendment would be technical, but a court or tribunal might find the error immaterial if the intended reference was clear from context. Given the lack of disclosed litigation, it is safe to assume that industry either treated the original AD as effective regardless, or that no enforcement action was litigated.

The absence of litigation does not mean there were no disputes. Disputes could have been resolved internally within CASA or through the AD review process. The AD mentions that the amendment corrects a typographical error, which suggests that the error was reported and corrected through an administrative process, not through a court order. This is typical for ADs; they are administrative instruments, and errors are corrected by CASA on its own initiative or at industry request.

Compliance date already expired The compliance date is 31 December 2004. Any aircraft that still has an unaffected water boiler that has not been inspected and marked (or scrapped) is almost certainly non-compliant. An aircraft that enters the Australian register today with such a water boiler is technically in breach of the AD from the moment of entry, if the water boiler falls within scope. This is a significant gotcha for importers and lessors. They must verify that every water boiler of the listed part and type numbers bears either the Driessen logo or the correct engraving. If not, the aircraft cannot be operated until the AD action is completed.

The AD applies regardless of the water boiler’s origin The AD does not distinguish between water boilers originally fitted at manufacture and those installed later as replacements. If a water boiler has the part number or type number listed and does not bear an exemption marking, it must be inspected. This means a maintenance organisation that installs a second-hand water boiler from a different aircraft must check its logo and terminal count before installation.

The engraving requirement is specific The engraving must be ‘Complies with AD F-2004-132’, not ‘Complies with AD/ELECT/74’ or any other text. The AD also requires it to be adjacent to the equipment label. An engraving in the wrong location or wording may be treated as non-compliance in an audit. The maintainer must not inadvertently place the marking on a different surface that could be misread or obscured.

No intermediate remedial action for three-terminal units A water boiler that has fewer than four terminals must be scrapped. There is no provision to modify the wiring, replace the overheat protector, or add terminals. The directive does not consider the possibility of a different design that could be safe with three terminals. The only airworthy outcome is a replacement. This could be expensive if the water boiler is in a hard-to-reach location or if no direct replacement part is available.

Acceptable means of compliance is limited to listed SBs Only the six listed Airbus SBs are acceptable. If a later revision of the SB exists, the operator must determine whether the AD implicitly accepts the later version. Typically, a Service Bulletin number without a revision letter references the original issue. An operator who embodied a later revision might need to confirm with CASA that it is equivalent. Similarly, an operator who owns a non-Airbus aircraft type (e.g., a business jet derived from an airliner) may not have an applicable SB and must follow the primary compliance path.

Logos can be confusing The AD distinguishes between the old Lermer logo and the new Driessen logo. But the source does not illustrate the difference beyond figure 1, which is not available in the text. In reality, a maintainer might encounter a variety of surface markings, and an old logo could be partially worn. The AD does not address borderline cases. A maintainer who misidentifies a Driessen logo as an old Lermer logo could waste time performing an unnecessary inspection; a misidentification in the other direction could result in an unsafe water boiler being returned to service.

Practical compliance involves a series of steps that any maintenance organisation or operator can adopt. The first step is to identify all aircraft in the fleet that are affected by the AD. This means creating a list of Airbus A300, A310, A300-600, A318, A319, A320, A321, A330, and A340 series aeroplanes on the Australian register or operated under an Australian certificate. For each aircraft, review the aircraft records, the service history, and any AD compliance registers to see whether the AD action has already been recorded. If an entry exists showing compliance with AD/ELECT/74 or its amendment, with the correct engraving or SB embodiment, no further action is needed. If there is doubt, physically inspect the water boiler.

The physical inspection requires access to the galley area where the water boiler is installed. Follow the AMM to remove any panels, covers, or trim needed to reach the boiler and to identify the identification plate at the rear. Visually check the part number and type number. Compare against the list in the AD. If the boiler is not one of those part numbers, or if it bears one of the exemption markings (an Airbus SB number or the words ‘Complies with AD F-2004-132’), document that fact and conclude the inspection. If the boiler is listed and unmarked, check the manufacturer logo. If it shows the new Driessen logo, again no further action is needed; record that.

If the old Lermer logo is present, the overheat protection must be inspected. Obtain a copy of the current Lermer GmbH CMM 25-30-31, page block 300. Disconnect electrical power to the boiler and follow the CMM procedures to physically isolate and inspect the overheat protector. Count the number of electrical terminals connected to the overheat protector. The AD does not define ‘connected’ - presumably, it means physically attached to the overheat protector and part of the electrical circuit. If there are four or more terminals, reassemble the boiler and engrave the compliance marking. Use an approved engraving tool and ensure the text is legible and permanent. The AD specifies engraving, not a sticker or pen. The location is ‘adjacent to the equipment label’. Ensure the marking is visible without requiring removal of the boiler. Photograph the marking for the records.

If there are fewer than four terminals, the water boiler must be scrapped. No partial credit is given. Remove the boiler from the aircraft, tag it as non-airworthy, and dispose of it in accordance with the organisation’s procedures for scrap parts. Source an airworthy replacement that is either a new Driessen boiler, or a used one that already bears the compliance marking or is a Driessen logo unit. Install the replacement using the AMM and ensure the aircraft records are updated to reflect the new part number.

For those operators who prefer the alternative means of compliance, obtain the relevant Airbus Service Bulletin (the correct one for the aircraft type). Embody the SB in accordance with the aircraft manufacturer’s instructions. The SB embodiment may include additional steps beyond the AD’s core requirement, such as replacement of the water boiler with a modified unit or additional wiring. Once the SB is embodied, the aircraft is compliant. Record the SB number in the aircraft logbook as the means of compliance. No engraving is required if the SB is used, but the AD does not explicitly forbid it.

Finally, update the AD compliance register. Enter the AD number (AD/ELECT/74 Amdt 1), the aircraft registration, the date of compliance, the method used (primary or SB), and the signature of the certifying engineer. Retain copies of any CMM inspection sheets, photographs, and SB embodiment records. The engraving itself serves as a visual cue, but paper records protect against future queries during audits or transfers of ownership.