CASA 136/15 - Approval — alternate means of compliance issued by a foreign State of Design for an airworthiness directive issued by the foreign State of Design

The instrument uses a small number of defined terms to delimit its effect.

• AMOC. The instrument uses the shorthand AMOC for alternate means of compliance (s 2). The approval in s 4 is an approval of a foreign AMOC as an AMOC for an equivalent Australian airworthiness directive.

• Foreign airworthiness directive. Defined in s 2 as an airworthiness directive for a particular kind of aircraft or aeronautical product that was issued, before 1 October 2009, by the NAA of the State of Design for that kind of aircraft or aeronautical product. The date cut-off is a definitional element of the scope.

• Equivalent Australian airworthiness directive. Also defined in s 2, this means an airworthiness directive issued by CASA for the purpose of addressing an unsafe condition in a particular kind of aircraft or aeronautical product that is subject to a foreign airworthiness directive. The term ties the foreign instrument to a CASA-issued directive which must exist for the approval in s 4 to operate.

• NAA. Defined as National Aviation Authority (s 2). The instrument requires the foreign AMOC to be “issued by a foreign NAA” (s 3), so the source authority is the foreign State of Design’s NAA.

Operational mechanics in the provisions:

• Application rule. Section 3 specifies that the approval applies to a foreign AMOC in respect of a foreign airworthiness directive for which CASA has issued an equivalent Australian airworthiness directive.

• Approval rule. Section 4 contains the operative approval: CASA (here the instrument says “I approve”) approves a foreign AMOC, with the corresponding foreign airworthiness directive, as an AMOC with the equivalent Australian airworthiness directive. The approval is subject to s 5 and Schedule 1.

• Temporal limit. Section 5 makes the approval dependent on the foreign AMOC remaining in effect; the CASA approval “will cease to have effect immediately after the foreign AMOC ceases to have effect.”

• Condition. Schedule 1 imposes an evidentiary and procedural condition: a person relying on the approved foreign AMOC must provide, upon request by CASA, a copy of the foreign AMOC and details of the person’s manner of compliance.

The instrument also contains administrative metadata: commencement (s 1), and compilation notes recording preparatory and amending instruments.

These concepts together create a recognition mechanism that is both conditional and time-limited, and that is confined to a specified class of foreign airworthiness directives (pre-1 October 2009 State-of-Design directives) for which CASA has issued an equivalent directive.

The instrument names actors and places obligations or practical effects on them either directly or by necessary implication from its operative provisions.

• CASA. The instrument is an approval made under the Civil Aviation Safety Regulations 1998 and is drafted in the form “I approve” (s 4). CASA is the entity that issues the equivalent Australian airworthiness directive (definition) and is the recipient of the materials that must be produced on request under Schedule 1. The instrument thus affects CASA’s regulatory recognition decisions and information-gathering.

• Foreign National Aviation Authorities. The foreign NAAs that issued the foreign airworthiness directives and foreign AMOCs are central to the instrument. The instrument only applies where the foreign airworthiness directive was issued by the State of Design’s NAA before 1 October 2009 (s 2 definition and s 3). The instrument recognises AMOCs issued by those foreign NAAs, subject to the limits in s 5 and the Schedule 1 condition.

• Holders of the foreign AMOCs and those who rely on them. Schedule 1 conditions apply to “a person who relies on an AMOC approved under section 4,” which captures any person who relies on the CASA approval of a foreign AMOC in order to comply with an equivalent Australian airworthiness directive. That will typically include operators, owners, maintainers, and perhaps repair stations or other maintenance organisations who adopt the foreign AMOC as the means of compliance with the Australian directive. Those persons are obliged, on request, to provide CASA with a copy of the foreign AMOC and details of the manner of compliance.

• Aircraft and aeronautical product kinds to which equivalent Australian airworthiness directives apply. The approval is class-specific: it applies “for a particular kind of aircraft or aeronautical product” (s 4). Persons working on those kinds are affected to the extent they rely on the approved foreign AMOC to meet CASA’s equivalent directive.

• Users of Australian airworthiness directives. The instrument creates a pathway by which a foreign AMOC can satisfy an equivalent Australian airworthiness directive. Therefore parties required to comply with an equivalent Australian airworthiness directive may, in the circumstances set out, rely on the foreign AMOC.

Who bears costs and compliance obligations. The instrument places a documentary obligation on the person who relies on the approved foreign AMOC (Schedule 1). It also places an implicit monitoring obligation on affected persons to track whether the foreign AMOC remains in effect, because the CASA approval ceases immediately when the foreign AMOC ceases to have effect (s 5).

The instrument does not itself create criminal penalties or specify enforcement mechanisms within its text. Any enforcement or consequences for non-compliance with CASA’s requests or with the equivalent Australian airworthiness directive must be situated within CASA’s powers and the Civil Aviation Safety Regulations 1998, which is the enabling framework referenced in the instrument.

The instrument sets out a small number of duties, rights and conditions, with clear textual anchors.

Duties

• Duty on CASA to recognise certain foreign AMOCs. Under s 4, CASA “approves as an AMOC with an equivalent Australian airworthiness directive … a foreign AMOC with the foreign airworthiness directive that corresponds to the equivalent Australian airworthiness directive,” subject to the limits in s 5 and Schedule 1. That is an administrative duty to recognise or treat the foreign AMOC as an approved AMOC in the specified circumstances.

• Duty on persons who rely on the approved foreign AMOC to provide information. Schedule 1 imposes a duty: any person relying on an AMOC approved under s 4 must, upon request, provide CASA (a) a copy of the foreign AMOC; and (b) details of the person’s manner of compliance. This is an enforceable condition of the approval.

• Duty to monitor foreign AMOC status implicitly required by the temporal limit. Section 5 makes the CASA approval coterminous with the foreign AMOC. While not phrased as a duty, users must track the foreign AMOC’s continuing effect if they intend to rely upon it, because the CASA approval ends “immediately after the foreign AMOC ceases to have effect.”

Rights

• Right to rely on CASA approval while foreign AMOC remains in effect. A person who meets Schedule 1’s condition may rely on the CASA approval to treat the foreign AMOC as acceptable against the equivalent Australian airworthiness directive for that particular kind of aircraft or product, for as long as the foreign AMOC remains in effect (s 4 and s 5). That is the core operational right created by the instrument.

• Right to have compliance assessed against the manner of compliance the person uses. Schedule 1 requires the person to provide “details of the person’s manner of compliance.” That implies that CASA’s assessment of the person’s compliance will be grounded in the disclosed manner, rather than an unspecified external standard within this instrument itself.

Limits, preconditions and procedural features

• The instrument’s application is conditional on the foreign airworthiness directive being a pre-1 October 2009 State-of-Design directive and CASA having issued an equivalent Australian airworthiness directive (s 2 definition; s 3). The approval does not arise outside those conditions.

• The approval is strictly conditioned by s 5 to the lifespan of the foreign AMOC. The approval is not open-ended.

• The instrument does not specify procedural timelines for CASA’s requests under Schedule 1, nor does it specify the format or level of detail required for “details of the person’s manner of compliance.” Those matters are left unspecified within the text.

Remedies and enforcement

• The instrument does not itself specify penalties, sanctions or remedies for failure to comply with its Schedule 1 condition. Any remedy or enforcement action would therefore arise from CASA’s regulatory powers under the Civil Aviation Safety Regulations 1998 or other relevant instruments, none of which are detailed within this instrument’s text.

In sum, the principal duties are (1) CASA’s recognition of specified foreign AMOCs as AMOCs for equivalent Australian ADs; and (2) the person’s obligation, when relying on that recognition, to provide documentation and compliance details to CASA upon request. The principal right is reliance on the CASA approval while the foreign AMOC remains in effect and the Schedule 1 condition is satisfied.

The instrument itself does not contain express penalty provisions, infringement notices, or specified enforcement mechanisms. Its text confines itself to approval, extent of approval, and a condition requiring provision of documents upon request (s 4, s 5, Schedule 1). The absence of explicit penalties in this instrument means the document does not, by its own terms, create standalone criminal or civil penalties.

Enforcement and consequences therefore must be read in light of the instrument’s legislative footing. The instrument is made under the Civil Aviation Safety Regulations 1998 (opening header and compilation note referencing paragraph 39.004(3)(a) of those Regulations). That indicates that enforcement and penalty mechanisms for failure to comply with applicable regulatory obligations, or for non-provision of information demanded by CASA, would be exercised under the broader Civil Aviation Safety Regulations 1998 or other CASA enforcement powers, rather than under this instrument itself. The instrument, as compiled, does not recite those enforcement provisions.

Practical enforcement points deducible from the instrument’s text

• CASA’s request power: Schedule 1 explicitly contemplates that CASA can request documentation and details. The text imposes an obligation on the person who relies on the approved AMOC to provide a copy and manner-of-compliance details “upon request.” The instrument does not articulate time frames for response, formats, or penalties for non-response. The mechanism for ensuring compliance with that request therefore depends on CASA’s regulatory powers elsewhere.

• Conditionality of approval. Section 5 renders the CASA approval automatically inoperative when the foreign AMOC ceases to have effect. That means that when a foreign AMOC is withdrawn, rescinded, or otherwise expires, CASA’s approval under this instrument immediately ceases. For operators who continue to rely on a foreign AMOC that has ceased, the consequence is loss of the CASA-recognised AMOC status. The instrument itself does not state the immediate legal consequences of continuing to use the now-unapproved AMOC; those consequences would likewise be governed by the Civil Aviation Safety Regulations 1998 and other applicable CASA instruments or statutory powers.

• Information asymmetry and enforcement discretion. The Schedule 1 condition addresses information asymmetry by enabling CASA to request documentary proof of the foreign AMOC and of the manner of compliance. Enforcement of failure to comply with a request will be a matter for CASA under its broader powers, which are not recited here.

Because the instrument does not itself set out penalties, any enforced consequence,escalation, directions to cease operations, administrative sanctions, or prosecution,must be sourced to CASA’s general regulatory powers in the Civil Aviation Safety Regulations 1998 or other relevant legislation. The instrument therefore operates as a conditional recognition mechanism whose policing depends on CASA’s broader enforcement toolkit.

This instrument is an administrative approval made under the Civil Aviation Safety Regulations 1998, and its operation must be read against that statutory framework. The instrument’s header and compilation notes explicitly state it was made under the Civil Aviation Safety Regulations 1998 and that it is in force under paragraph 39.004(3)(a) of those Regulations (compilation notes). That establishes the instrument’s legal provenance: it is an instrument exercising CASA’s regulatory authority under the CASR regime.

Specific interactions and cross-references suggested by the instrument’s text

• Relationship with CASA-issued airworthiness directives. The instrument’s approval is expressly tied to the existence of an “equivalent Australian airworthiness directive” that CASA has issued (s 2 definition; s 3). The foreign AMOC is approved only as an AMOC with respect to that equivalent Australian airworthiness directive. That creates a direct interaction between foreign NAA directives and CASA’s regulatory instruments: the foreign AMOC is not recognised in a vacuum, but only as a means of compliance with a CASA directive that addresses the same unsafe condition.

• Temporal interaction: foreign AMOC lifecycle and CASA approval. Section 5 connects the legal force of this instrument to the lifecycle of the foreign AMOC. The CASA approval exists only while the foreign AMOC remains in effect. Therefore any changes to the foreign AMOC (withdrawal, amendment, revocation) have immediate legal consequences for the CASA approval. This creates an operational dependency across jurisdictions: domestic compliance footing can hinge on a foreign NAA’s decision.

• Information and compliance reporting. Schedule 1 requires persons who rely on the approved foreign AMOC to provide CASA, on request, with a copy of the foreign AMOC and details of the manner of compliance. That creates an interaction with broader CASA information-gathering and oversight powers; it imports foreign documentation into the Australian regulatory oversight process.

• No conflicting amendment or supersession clauses. The instrument does not contain express clauses that displace, override, or amend other CASA instruments or regulations; rather, it functions as a recognition instrument within CASA’s regulatory toolkit. The compilation notes show that Schedule 1 was amended by CASA 07/16 (Table of amendments). Where other CASA instruments or CASR provisions contain enforcement or penalty powers, the administration and enforcement of this instrument will be coordinated through that framework.

Matters the instrument leaves to other laws or instruments

• Enforcement mechanics. As noted above, the instrument does not set out penalty provisions. Enforcement, sanctions, or remedies for non-compliance with Schedule 1 or for failure to comply with equivalent Australian airworthiness directives would be undertaken under the Civil Aviation Safety Regulations 1998 or other CASA powers.

• Procedural standards for “manner of compliance.” The instrument requires disclosure of “details of the person’s manner of compliance” (Schedule 1) but does not define the substance or standard for such details. How those details are evaluated, and what evidentiary standards CASA will apply in judging adequacy, will be matters for CASA’s processes and possibly other instruments or guidance.

• Interaction with international agreements or bilateral arrangements. The instrument recognises foreign AMOCs in a tightly bounded way but does not itself implement or rely on any specific bilateral safety agreements in text. Any interaction with international obligations or arrangements would be managed through CASA’s broader regulatory policy.

In short, this instrument functions as a limited recognition mechanism embedded within CASA’s regulatory architecture under the Civil Aviation Safety Regulations 1998. Its cross-border dependencies (the foreign AMOC’s continuing validity, pre-2009 date of the foreign AD, and the existence of an equivalent Australian airworthiness directive) create operational touchpoints across foreign NAAs and CASA’s domestic airworthiness oversight.

The compilation notes and tables appended to the instrument record the administrative provenance and amendments up to the compilation date.

• Initial instrument. CASA EX136/15, titled “Approval - alternate means of compliance issued by a foreign State of Design for an airworthiness directive issued by the foreign State of Design,” was registered on 18 September 2015 and commenced on that date (Table of instruments).

• Amendment. CASA EX07/16, an amendment to CASA 136/15, was registered on 22 January 2016 and commenced on 23 January 2016 (Table of instruments). The Table of amendments records that Schedule 1 was amended by CASA 07/16 (Table of amendments row). The compilation header states the instrument is “as amended” and that the compilation was prepared on 22 January 2016 taking into account amendments up to CASA 07/16.

• Compilation. The version provided is the compilation prepared by the Legal Branch, Legal Services Division, Civil Aviation Safety Authority, Canberra, with preparation date 22 January 2016 and noting amendments up to CASA 07/16.

What the amendment history tells the reader

• Schedule 1 was amended by CASA 07/16. The instrument therefore underwent at least one substantive change to the conditional information requirement. The Table of amendments entry identifies Schedule 1 as the provision affected and records “am. CASA 07/16,” indicating amendment. The text of Schedule 1 as presented in the compilation is the post-amendment version; the compilation does not attach the pre-amendment text.

• Administrative lifecycle. The compilation notes situate the instrument within CASA’s administrative practice of making approvals under paragraph 39.004(3)(a) of the Civil Aviation Safety Regulations 1998. The dates of registration and commencement in the Table of instruments provide the precise timeline for the instrument’s administrative lifecycle.

• No further amendments listed. The compilation’s amendment table lists only CASA 07/16 as affecting Schedule 1. The instrument’s compilation statement is limited to amendments up to CASA 07/16. Any reader relying on the instrument should check whether further amendments were made after the compilation date, because the compilation only claims currency to 22 January 2016.

For practitioners, the amendment history is a prompt to examine whether the Schedule 1 obligation has been modified and to confirm that the version being relied upon is the current one. The compilation documents both the original approval instrument and the subsequent amendment instrument by registration and commencement dates.

The instrument’s compilation contains no references to judicial decisions, litigation, or case law. There are no cases cited in the instrument text, nor are there references to appeals, judicial review, or disputes arising from this approval instrument in the compilation notes or tables.

Consequences of the absence of litigation references

• No recorded judicial interpretation. Because the instrument does not reference litigation, there is no body of judicial interpretation embedded in the compilation that would clarify ambiguities in phrases such as “details of the person’s manner of compliance,” or how s 5’s temporal cessation operates in borderline situations. Practitioners must therefore rely on the plain text of the instrument and on CASA guidance or CASA administrative practice when available.

• Governance and administrative discretion remain primary. In the absence of reported cases, resolution of contested issues about the instrument’s operation,such as disputes over whether a particular foreign AMOC is the “corresponding” AMOC to an equivalent Australian airworthiness directive,would be matters for administrative processes at CASA unless litigated. The instrument itself does not govern appeals or dispute resolution procedures.

• Due diligence required. When no litigation precedent exists to guide interpretation, affected parties should be attentive to the text’s definitions and conditions (s 2, s 3, Schedule 1) and should document compliance carefully. Any party contemplating reliance on an approved foreign AMOC should obtain CASA confirmation where possible or be prepared to defend the approach under the broader statutory framework.

In short, the compilation includes no litigation history. Practitioners should treat the instrument as an administrative approval whose interpretation and enforcement are dependent on CASA’s implementation and on the surrounding CASR framework.

The instrument is compact, but its specific textual features create several practical pitfalls and points where parties commonly misread scope or obligations. The following are concrete matters to watch for, grounded in the instrument’s text.

1. Limited universe of foreign airworthiness directives. The term “foreign airworthiness directive” is defined as one issued before 1 October 2009 by the State-of-Design NAA (s 2). That date cut-off excludes directives issued on or after 1 October 2009. Parties who assume any foreign AD can be recognised will be mistaken; only pre-1 October 2009 State-of-Design ADs fall within this instrument’s scope.

2. Needs an “equivalent Australian airworthiness directive.” The approval in s 4 applies only where CASA has issued an equivalent Australian airworthiness directive to address the same unsafe condition (definition of equivalent Australian airworthiness directive and s 3). If CASA has not issued such an equivalent directive, the foreign AMOC is not subject to this instrument’s approval.

3. Approval is coterminous with foreign AMOC. Section 5 states the CASA approval “will cease to have effect immediately after the foreign AMOC ceases to have effect.” Relying parties must track the foreign AMOC’s continuing validity. If the foreign AMOC is withdrawn or varied by the foreign NAA, the CASA approval ends automatically, potentially leaving operators without an approved AMOC for the Australian directive.

4. Disclosure obligation upon request only. Schedule 1 requires that a person relying on the approved foreign AMOC must provide a copy of the foreign AMOC and “details of the person’s manner of compliance” upon request. The obligation is triggered by a CASA request; the instrument does not specify routine filing, nor does it specify response timelines, formats, or the level of detail required. That creates potential uncertainty about CASA’s expectations and response deadlines.

5. Ambiguity about sufficiency of “details of manner of compliance.” The instrument does not define what detail suffices. Practitioners must anticipate that CASA may require technical substantiation, maintenance records, or engineering data, but the instrument itself provides no checklist. The lack of a defined standard may produce differing expectations between CASA and operators.

6. No express penalties in this instrument. The instrument does not specify sanctions for failure to comply with Schedule 1 or for continuing to rely on a foreign AMOC that has ceased. Enforcement mechanisms would be those available to CASA under the Civil Aviation Safety Regulations 1998. Parties should not assume the instrument’s silence means non-enforceability.

7. Scope limited to particular kinds. The approvals are for “a particular kind of aircraft or aeronautical product” (s 4). Users must be careful not to treat the approval as generic across multiple types or models unless the approval and the equivalent Australian airworthiness directive expressly cover them.

8. Amendments and currency risk. Schedule 1 was amended by CASA 07/16 per the Table of amendments. The compilation is current only to the date noted. Parties should confirm that no further amendments have been made since the compilation date.

9. Foreign AMOC must be “with the foreign airworthiness directive that corresponds to the equivalent Australian airworthiness directive.” The instrument requires correspondence between the foreign AD and the CASA AD. A loose or partial correspondence may be contested.

10. Administrative reliance risk. Because the instrument is an administrative approval rather than a statutory exemption with detailed procedural rules, reliance places the onus on the person to maintain records and to respond to CASA. Failure to do so may expose the person to enforcement action under the broader regulatory scheme.

These “gotchas” are textual and procedural consequences of the instrument’s drafting. They reflect narrowness of scope, dependency on foreign regulatory instruments, conditionality, and unspecified procedural detail that practitioners should explicitly manage.

Complying with the instrument entails satisfying its preconditions, meeting the Schedule 1 disclosure requirement when requested, and managing ongoing monitoring obligations. The steps below are a practical, text-grounded checklist to operationalise compliance.

1. Confirm the foreign airworthiness directive is within scope. Verify that the foreign airworthiness directive was issued by the State-of-Design NAA and that it was issued before 1 October 2009 (definition in s 2). If the foreign AD does not meet that date or issuer criterion, CASA 136/15 does not apply.

2. Confirm CASA has issued an equivalent Australian airworthiness directive. Check that CASA has issued an airworthiness directive that CASA describes as addressing the same unsafe condition for the particular kind of aircraft or aeronautical product (definition of equivalent Australian airworthiness directive and s 3). The CASA approval in s 4 requires the existence of such an equivalent directive.

3. Confirm there is a foreign AMOC issued by the foreign NAA that corresponds to the foreign AD. The instrument applies to a foreign AMOC issued by a foreign NAA in respect of the foreign airworthiness directive (s 3 and s 4). Ensure the AMOC you intend to rely on is the foreign NAA’s issued AMOC, and that it explicitly relates to the foreign AD that corresponds to the CASA AD.

4. Maintain a clear copy of the foreign AMOC and supporting material. Schedule 1 obliges a person who relies on the approved AMOC to provide, upon request, a copy of the foreign AMOC (Schedule 1(a)). Keep certified copies or verifiable originals and maintain provenance documentation showing the foreign NAA as issuer.

5. Document and retain details of your manner of compliance. Schedule 1(b) requires details of the person’s manner of compliance. Maintain written procedures, maintenance records, engineering assessments, test data, and any other material evidencing how the AMOC is being applied in practice. Prepare the documentation in a format that allows timely production upon CASA request.

6. Monitor the foreign AMOC’s status continuously. Section 5 makes the CASA approval cease “immediately after the foreign AMOC ceases to have effect.” Establish processes to monitor the foreign NAA’s notices, bulletins, and formal communications so that if the foreign AMOC is revised or revoked you can promptly move to alternative compliance measures or notify CASA.

7. Be prepared to pivot to alternative compliance. Because reliance on the CASA approval ends with the foreign AMOC, maintain contingency plans for compliance with the equivalent Australian airworthiness directive in the event the foreign AMOC ceases, including the capacity to implement the measures specified in the Australian directive or to seek a CASA-approved domestic AMOC.

8. Respond to CASA requests promptly. While the instrument does not state a specific timeframe for responding to a Schedule 1 request, the obligation is triggered “upon request.” Adopt internal service levels to produce the required documentation quickly, and record your responses, including dates and the identities of the CASA officer who made the request.

9. Check the current version of the instrument. The compilation notes show Schedule 1 was amended by CASA 07/16. Ensure you are working from the current instrument and not an outdated version; confirm whether any subsequent amendments have been made after the compilation date. Rely on the official CASA instrument register for current text.

10. Consider proactive engagement with CASA where ambiguity exists. If there is uncertainty whether a particular foreign AMOC corresponds to the equivalent Australian airworthiness directive, or about the sufficiency of the “details of the person’s manner of compliance,” seek clarification from CASA in writing. Where possible, obtain CASA’s written acceptance that the documentation you hold is sufficient to rely on the approval.

11. Recordkeeping and audit readiness. Given the information obligation and the dependency on foreign AMOC status, maintain an auditable trail of decisions, technical evaluations, and communications with CASA and the foreign NAA. Ensure that personnel responsible for compliance know where the foreign AMOC documents, manner-of-compliance records, and monitoring logs are stored.

12. Where appropriate, obtain legal or technical advice. If the foreign AMOC’s scope or the correspondence to the equivalent Australian airworthiness directive is disputed or unclear, obtain advice that identifies the technical mapping between the foreign AMOC and the CASA directive, and that addresses potential gaps.

These steps implement the instrument’s text: they ensure the substantive preconditions are met (s 2, s 3), the CASA approval is correctly relied upon (s 4, s 5), and the Schedule 1 condition is satisfied when CASA requests documentation. The instrument leaves several procedural aspects unspecified, so proactive documentation, monitoring and CASA engagement are essential for practical compliance.