AD/DH 60/9 Amdt 1 - Lateral Fuselage Tie Rods - Removal and Replacement

The central concept of AD/DH 60/9 Amdt 1 is lateral fuselage tie rods as a critical structural component linking the fuselage sides on DH 60 (Moth) series aeroplanes (including variants such as the Tiger Moth). Their failure can cause in-flight structural break-up. The AD introduces a defined list of acceptable tie rods comprising four categories: (a) rods manufactured for DHSL (de Havilland Support Ltd), identified by part number H 25487 marked in ink with DHSL engraved and a serial number on one end, and nuts with part number H 25486; (b) original equipment manufacturer (OEM) rods from de Havilland, Morris Motors, or de Havilland (Australia); (c) rods from Bruntons Aero Products Ltd (UK); and (d) rods from HG Aerospace Engineering Ltd (UK). Any rod not falling into these categories, or which is not traceable to an acceptable source, is considered unacceptable. Notably, rods produced by J&R Aerospace (part numbers JRA-776-1 and JRA-776-4) are explicitly not acceptable.

Another key concept is provenance confirmation. The AD requires operators to establish the history of each lateral tie rod fitted. This is not merely a visual inspection; it involves identifying the manufacturer, checking part numbers, and verifying that the rod is from the approved list. Where rods are part-life (i.e., previously removed from another aircraft), the operator must obtain Authorised Release Certificates and details of previous life consumed. This elevates record-keeping to a mandatory condition of continuing airworthiness for the tie-rod system.

The AD introduces a two-stage compliance timeline. Stage one (effective immediately on 28 August 2014) is the suspension of aerobatic flight. Stage two (within 10 flight hours) is the provenance check and any required removal and replacement. The AD does not distinguish between aircraft that have never flown aerobatics and those that have; the suspension applies irrespective of actual usage until acceptable rods are confirmed.

The destruction requirement is a notable concept. Removed unacceptable tie rods and nuts must be physically destroyed. This prevents them from re-entering the supply chain, whether as spares or as core material for reconditioning. The AD thus eliminates any possibility of the J&R Aerospace rods or other unapproved rods being fitted to another aircraft later. This is a stronger remedy than simple removal and storage, imposing a permanent loss of an asset.

Finally, the AD interacts with the existing retirement life concept from earlier directives. Even acceptable rods remain subject to the 2,000-hour or 18-year life limit. The new AD does not change that limit; it only adds an extra condition that the rods must be from an approved source. The AD’s background section notes that the accident rod (JRA-776-1) had accumulated only 1,300 hours when it failed, well within the 2,000-hour limit, highlighting that the manufacturing process (rather than mere age) was a causal factor.

The AD directly applies to any person or entity responsible for the operation, maintenance, or continued airworthiness of a DH 60 (Moth) series aeroplane registered in Australia. This includes private owners, flying schools, warbird operators, museums, aerial work operators, and any business that uses Moth aircraft for hire or reward. Each such operator must comply with the two requirements: cease aerobatic flight and confirm provenance within 10 flight hours.

Aircraft maintenance organisations (AMOs), especially those specialising in vintage or de Havilland types, are affected as they will be called upon to perform the inspection, removal, and replacement work. The AD imposes a duty on the operator, but in practice the compliance tasks will be delegated to licensed aircraft maintenance engineers (LAMEs) or approved maintenance organisations. These entities must understand the provenance documentation requirements and be able to source acceptable replacement rods.

The AD also affects the supply chain for lateral tie rods. Approved manufacturers (DHSL, Bruntons, HG Aerospace) and their distributors may see increased demand. Conversely, J&R Aerospace and any other non-approved manufacturers lose the Australian market for these parts. The destruction requirement may affect businesses that had stocks of J&R Aerospace or unknown-origin rods, as those stocks must now be rendered unusable.

Insurance companies may be affected indirectly. An aircraft operator who fails to comply with the AD and suffers an accident could face denial of coverage or subrogation claims. The AD’s mandatory language raises the standard of care for operators; non-compliance could constitute a breach of airworthiness regulations, potentially voiding liability insurance.

Museums and historic aircraft restorers that operate Moth aircraft in non-aerobatic roles are less affected by the aerobatic suspension, but they must still complete the provenance check and replace any unacceptable rods. These entities often have limited budgets and may rely on donations or volunteer labour; the cost of sourcing approved rods (plus possible specialised labour) could be significant.

Finally, the AD indirectly affects the broader aviation community. The grounding of aerobatic Moth aircraft reduces the pool of vintage aircraft available for airshows, training in tailwheel and aerobatic skills, and recreational flying. This may have cultural and economic impacts on organisations that operate Moth aircraft for public benefit, such as the Australian Tiger Moth Association or similar groups. The AD may also influence the resale value of DH 60 aircraft, as unmodified or non-compliant aircraft become less attractive to potential buyers.

The AD imposes several explicit duties on the operator of any DH 60 series aircraft subject to its applicability.

Duty to suspend aerobatic flight. From the effective date (28 August 2014), the operator must not conduct any aerobatic manoeuvres in the aircraft. This duty is immediate and unconditional; it does not depend on the outcome of the provenance check. Aerobatic flight may only recommence once acceptable lateral tie rods are confirmed fitted. The operator bears the burden of ensuring that the aircraft’s flight manual and operating procedures reflect this prohibition.

Duty to confirm provenance. Within 10 flight hours of the effective date, the operator must determine whether the lateral tie rods fitted are from an acceptable source (as defined in the AD). This involves physical inspection, part number verification, and possibly contacting manufacturers or reviewing maintenance records. If the tie rods were installed by a previous owner or an AMO, the operator must obtain and retain the necessary documentation (e.g., Authorised Release Certificates for part-life rods). This duty is ongoing after the 10-hour deadline, but the initial check must be completed by that time.

Duty to remove and destroy unacceptable rods. If the tie rods and nuts are not acceptable (including those produced by J&R Aerospace or of unknown provenance), the operator must arrange for their removal and physical destruction. The duty is to replace them with acceptable rods using the installation procedure specified in British Aerospace Technical News Sheet CT (Moth) No. 29 Issue 3 (or a later approved revision). The operator must ensure that destruction is witnessed or documented to prove compliance.

Duty to substantiate replacement parts. If using part-life rods (i.e., rods previously removed from another aircraft), the operator must obtain the relevant Authorised Release Certificate and a record of previous life consumed (hours and cycles). This requirement prevents the recycling of rods of unknown history.

Rights of the operator. The AD confers a right to recommence aerobatic flight once acceptable rods are confirmed installed. This right is unconditional on any other regulatory step; simply fitting acceptable rods and recording that fact is sufficient to lift the aerobatic ban. Additionally, the AD does not prevent the operator from continuing non-aerobatic operations while the provenance check is pending, provided the rods are not known to be defective. The operator also retains the right to choose any of the acceptable rod manufacturers or suppliers, subject to availability and cost.

Rights of the regulator. CASA, through this AD, reserves the right to require proof of compliance, to inspect aircraft and records, and to take enforcement action against non-compliant operators. The AD does not explicitly state a right of appeal, but a person affected by the AD may challenge it through administrative review mechanisms under the Civil Aviation Act.

The AD itself does not specify a penalty amount; it is a regulatory instrument issued under the Civil Aviation Act 1988 and Civil Aviation Safety Regulations 1998 (CASR). Non-compliance with an Airworthiness Directive is an offence under the Act, which can lead to civil or criminal penalties. Typical consequences for breaching an AD include: suspension or revocation of the aircraft’s Certificate of Airworthiness and the operator’s Air Operator’s Certificate; fines (up to $5,550 for individuals and $27,750 for bodies corporate for strict liability offences, per CASR); and in serious cases, prosecution for endangering the safety of an aircraft, potentially with higher penalties and imprisonment.

Enforcement is carried out by CASA’s enforcement officers. The AD is mandatory and is not subject to any exemption process stated in the document. The accident that triggered this AD (South Stradbroke Island, December 2013) involved loss of life, so CASA is likely to treat non-compliance with particular seriousness.

The AD’s destruction requirement serves an enforcement purpose: it physically removes non-compliant parts from circulation, making future non-compliance easier to detect (since an aircraft fitted with J&R Aerospace or other unapproved rods must eventually reveal that fact during maintenance or sale). Operators who fail to destroy removed rods may be in breach even if they have performed the removal.

Evidence of compliance will typically be recorded in the aircraft’s maintenance release or logbook, including the part numbers of fitted rods, the date of inspection, and reference to the AD. CASA may request these records during a ramp inspection or audit. Failure to produce records that demonstrate compliance could itself be treated as non-compliance.

The AD’s amendment history notes an administrative problem with tabling the earlier version, which required reissuance. This does not affect penalties for non-compliance with the current AD, but it underscores that earlier versions may have been invalid or not properly gazetted. The current version (Amdt 1) is the operative one from 28 August 2014.

Ultimately, the penalty for ignoring the AD could range from a spot fine up to the grounding of an aircraft or loss of operating authority. For a commercial operator, the cost of non-compliance could exceed the cost of replacement rods by orders of magnitude, especially if an accident occurs.

This AD is issued under the authority of the Civil Aviation Act 1988 and the Civil Aviation Safety Regulations 1998. It forms part of the body of Australian airworthiness law that applies to type-certificated aircraft. The AD does not override primary legislation but rather supplements it by imposing a specific mandatory continuing airworthiness requirement.

The AD explicitly references British Aerospace Technical News Sheet CT (Moth) No. 29 Issue 3 (or later approved revision) for the accomplishment instructions for replacement of tie rods. That document becomes a mandatory compliance method under the AD. The AD does not incorporate other versions of Technical News Sheet CT (Moth) No. 29; only Issue 3 or later. The earlier AD (AD/DH60/4) is also referenced for the retirement life of lateral tie rods (2,000 hours or 18 years). The new AD does not alter that life limit; it adds a separate check on provenance.

There may be interaction with foreign airworthiness regulations. If a DH 60 series aircraft is imported or exported, the AD’s requirements may be recognised by other civil aviation authorities through bilateral agreements. For example, the European Union Aviation Safety Agency (EASA) or the Federal Aviation Administration (FAA) may adopt similar ADs for aircraft on their registers. Australian operators who lease the aircraft overseas must ensure that the foreign regulator accepts compliance with this AD.

The AD also interacts with CASA’s own regulatory framework for maintenance (CASR Part 42, Subpart 42.C and Part 145). The operator must have the work described in the AD performed either by a person authorised under the regulations (e.g., a LAME with appropriate ratings) or by an approved maintenance organisation. The AD itself does not specify who may do the work, but the Civil Aviation Regulations limit such activities. Similarly, the need for Authorised Release Certificates aligns with CASR requirements for release to service.

There is potential interaction with contract law between operators and maintenance providers. If an AMO performs the check and replaces rods, the operator may rely on the AMO’s warranty or indemnity for defective work. The AD does not create contractual rights but may influence the scope of duty owed by the AMO.

The AD’s destruction requirement may intersect with environmental or waste laws if the rods are made of hazardous materials (though unlikely in this case). Not a significant interaction but a theoretical one.

Finally, the AD does not affect state or territory aviation safety laws (which are generally limited) but could be relevant in civil litigation following an accident. A court may consider compliance or non-compliance with this AD as evidence of negligence or due diligence under the Civil Liability Act of a state or territory.

The source document, AD/DH 60/9 Amdt 1, is itself an amendment (Amdt 1) to an earlier AD/DH 60/9. The AD’s endnote states: “This AD is reissued due to an administrative problem with the tabling of the earlier version and to correct an error in the relevant company’s title name.” This suggests that the original AD/DH 60/9 was either not properly tabled in accordance with legislative instrument requirements, or the company name reference (likely DHSL or the UK suppliers) was incorrect. The reissuance under Amdt 1 rectifies those issues without altering the substantive requirements.

No other amendment history is provided in the source. The AD does not reference prior amendments to itself. It does, however, reference another AD (AD/DH60/4) which mandated the retirement life for lateral tie rods. That AD is separate and had its own history.

The administrative problem may have been minor (e.g., a failure to table the instrument in the Federal Register of Legislation within the required timeframe) but carries practical consequences: any enforcement action taken under the original, potentially invalid, instrument could have been challenged. The reissuance ensures the AD is legally effective from 28 August 2014.

The correction of the company’s title name is not elaborated. It could be an error in the spelling or legal name of DHSL or one of the approved manufacturers. This is a minor correction but necessary to give legal certainty about which parts are acceptable.

There is no information on any future amendments. The AD remains current unless superseded or cancelled by a later instrument. The background notes that the AD was prompted by the 2013 accident, so it is likely the regulator sees this as a permanent measure.

The source does not mention any litigation directly related to this Airworthiness Directive. The in-flight break-up off South Stradbroke Island on 16 December 2013 is described as an accident, and the AD is a regulatory response. There is no reference to any court proceedings arising from that accident, nor to any challenge to AD/DH 60/9 Amdt 1 itself.

It is possible that the accident led to a coronial inquest, a safety investigation by the Australian Transport Safety Bureau (ATSB), or compensation claims by the families of the deceased, but none are mentioned in the source. The AD is not the subject of any noted court case.

The absence of litigation history is noteworthy. Airworthiness directives are rarely directly challenged in court due to the high cost and low probability of success; operators typically comply rather than sue. However, the administrative reissuance suggests that there was a legal vulnerability in the original version (perhaps a failure to comply with the Legislation Act 2003 regarding tabling), but that was corrected before any challenge materialised.

If an operator had been prosecuted for non-compliance with the original, improperly tabled AD, such a prosecution might have been defective. The reissuance moots that possibility by starting fresh.

Thus, the litigation history under this section is nil from the source. No cases are named, and no outcomes are recorded. This section necessarily reflects that absence.

Several less obvious aspects of AD/DH 60/9 Amdt 1 could catch operators off-guard.

The aerobatic suspension applies regardless of the tie rod’s condition. Even if the aircraft has documented acceptable rods fitted, the AD requires that they be confirmed. Until that confirmation is recorded (presumably in the aircraft’s logbook), aerobatic flight is banned. An operator who flies aerobatics on day one, even with DHSL rods, is technically in breach if they have not yet completed the formal confirmation step. The AD says aerobatic flight “can only recommence once acceptable lateral tie rods are confirmed to be fitted.” The word “confirmed” suggests a deliberate verification process, not merely a factual state.

The 10-flight-hour window is from the effective date, not from the operator’s date of awareness. Many owners may not read CASA’s AD notifications promptly. If an aircraft flies 10 hours after 28 August without the check, it is non-compliant. The operator could face enforcement action even if the rods are actually acceptable. There is no grace period for unawareness.

Part-life rods require Authorised Release Certificates and previous life details. That means buying a used tie rod from a scrapyard without paperwork is not enough, even if the rod is physically from an approved manufacturer. The AD demands a paper trail. This may be difficult for historic aircraft parts that have passed through many hands. Without the certificate, the rod is legally unacceptable.

Removed rods must be destroyed, not merely stored. An operator who removes a J&R Aerospace rod and keeps it as a souvenir or for potential reconditioning is in breach. The AD requires destruction. This may be an unfamiliar requirement for some, who might think removal suffices.

The definition of acceptable rods is narrow and technology-specific. Only rods from listed manufacturers with specific markings are acceptable. Rods that are visually identical but lack the ink mark or engraving may be rejected. The AD does not allow an engineering assessment as an alternative to the part number check. This creates a hard line: if the part number is not legible, the rod is unacceptable.

There is no provision for temporary relief or exemption. Unlike some ADs that allow for alternative methods of compliance (AMOC) with CASA approval, this AD does not mention any such process. Operators cannot apply for an extension of the 10-hour deadline or a waiver for non-approved rods.

The AD refers to “British Aerospace Technical News Sheet CT (Moth) No. 29 Issue 3 or later approved revision” for replacement instructions, but the AD itself does not provide a reproduction of that document. The operator must obtain it separately. The AD does not say where to get it. This may cause delays if the document is not readily available.

The effective date is 28 August 2014, but the AD was signed on that day. If the AD was not gazetted or published until later, the legal effective date is still 28 August, potentially creating a short period of retrospectivity for flights between the signature date and the publication date. Operators cannot rely on ignorance.

Destroying rods may affect the value of the aircraft if original parts are removed. Collectors may value original components, but the AD forces their destruction, permanently reducing the aircraft’s originality.

To comply with AD/DH 60/9 Amdt 1, an operator of a DH 60 series aircraft should follow this process:

Step 1: Immediately upon the effective date (28 August 2014) or upon acquiring the aircraft after that date, suspend all aerobatic flight. No aerobatic manoeuvres may be conducted until Step 3 is completed. The aircraft may still be flown in non-aerobatic operations.

Step 2: Within 10 flight hours of the effective date, perform a provenance check on each lateral fuselage tie rod (both sides) and their attaching nuts. Locate the part numbers and markings on the rods and nuts. Compare them against the definition of acceptable tie rods in the AD. The categories are: (a) DHSL manufactured rods with part number H 25487, ink mark, DHSL engraving and serial number, with nut part number H 25486; (b) OEM rods from de Havilland, Morris Motors, or de Havilland (Australia); (c) Bruntons Aero Products (UK); (d) HG Aerospace Engineering (UK). If the rod is not from any of these sources, or if it is from J&R Aerospace (part numbers JRA-776-1 or JRA-776-4), it is unacceptable.

Step 3: If the rods are acceptable (and the operator has documentary evidence, such as invoices or logbook entries confirming their provenance), record this fact in the aircraft’s maintenance records with a reference to the AD. Aerobatic flight may then recommence.

Step 4: If the rods are not acceptable (including unknown provenance, missing markings, or from J&R Aerospace), the operator must arrange for an appropriately authorised person (LAME or AMO) to remove the tie rods and nuts and physically destroy them. Obtain a certificate of destruction or similar evidence.

Step 5: Procure replacement tie rods and nuts that are acceptable from the approved manufacturers. If using part-life rods (previously fitted to another aircraft), obtain from the seller a relevant Authorised Release Certificate and a statement of previous life consumed (flight hours and years). The replacement must be performed in accordance with the accomplishment instructions in British Aerospace Technical News Sheet CT (Moth) No. 29 Issue 3 or a later CASA-approved revision. This may require tightening to specific torques and using correct locking devices.

Price and availability are practical considerations. Operators should contact DHSL (for part numbers H 25487 and H 25486), Bruntons Aero Products, or HG Aerospace Engineering. Expect that these are low-volume, made-to-order parts, so lead times could be weeks or longer. The operator may need to ground the aircraft beyond the 10-hour window if replacements are not immediately available; however, the 10-hour limit only applies to the check, not to the replacement. The aircraft may not fly at all if the rods are unacceptable; the 10-hour deadline is for the check, but flying with unacceptable rods is prohibited immediately. In practice, once unacceptable rods are discovered, the aircraft should not be flown again until replacements are fitted. The 10-hour period is only to allow a short grace to fly to a maintenance facility, but the AD’s structure suggests that continued flight beyond the check deadline with unacceptable rods would be a breach.

**Step 6: After replacement, record the work in the aircraft’s logbook, noting the new part numbers, the installation reference, and the compliance with this AD. Retain certificates and life records. Aerobatic flight may recommence immediately.

Step 7: Periodically monitor for any further amendments to AD/DH 60/9 or the referenced technical news sheet. The life limit of 2,000 hours or 18 years still applies, so plan for eventual replacement before that limit is reached.

Cost estimation. From an economic perspective, the direct compliance cost includes: labour (Likely 2-4 hours for inspection; 4-8 hours for replacement), the cost of new rods (likely several hundred to a few thousand Australian dollars per rod, depending on supplier), and the cost of destroying the old rods. Indirect costs include grounding during lead time, lost revenue from aerobatic flights, and potential overhauls of related components. The AD imposes a non-recurring cost that may be significant for small operators. The lack of alternative methods of compliance means there is no cheaper path than buying from the approved suppliers.