AD/A119/10 - Hydraulic Pipe Interference

The AD embodies a small set of technical and regulatory concepts. These are set out in the AD text itself and in the Agusta Bollettino Tecnico it mandates.

Applicable hardware and parts

• The AD is targeted at two specific original pipe part numbers: 109-0761-64-103 and 109-0761-65-103 (Applicability). It identifies two replacement part numbers as the approved terminating hardware: 109-0763-96-101 and 109-0763-97-101 (Requirement 2).

Two-tier compliance model

• Interim mitigation by inspection: Operators must carry out inspections in accordance with Part I and II of Agusta BT 119-22 and replace pipes "as necessary" until permanent replacement occurs (Requirement 1). The AD prescribes an initial short window (within 50 flight hours) and a maximum recurring interval (100 flight hours) for these inspections (Compliance 1).
• Terminating action by hardware change: Installation of the specified new pipes, and following Part II of Agusta BT 119-22, stops the need for the repetitive inspections. The AD explicitly labels installation of the new pipes as a terminating action for the inspections detailed in Requirement 1 and 2 (Requirement 2).

Prohibition on future installation of old parts

• From 31 July 2008 the AD forbids installation of the older pipe P/Ns (Requirement 3 and Compliance 3). That prohibition converts the AD from a pure inspection/remediation regime into a parts-control rule affecting maintenance, repair and overhaul supply chains and stock management.

Normative procedures external to the AD

• The AD does not itself set out inspection or replacement procedures. It makes those procedures normative by reference to Agusta BT 119-22 Part I and Part II (Requirement 1 and 2). Compliance therefore requires access to and execution of the technical steps contained in that Bollettino.

Safety rationale as stated in the AD

• The causal safety concern is mechanical interference between the hydraulic pipe and the tail rotor control rod assembly, previously observed on Agusta A109E helicopters, and considered to present risk of damage to hydraulic pipes that could lead to loss of hydraulic system No. 1 in flight (Background). The AD extends corrective actions to A119 due to design similarity.

Cross-reference to European authority

• The AD notes EASA AD 2007-0231 dated 23 August 2007 as relevant (Requirement note). The AD thus signals alignment with a European airworthiness action while making the measures mandatory for affected Australian-registered aircraft via CASA’s AD mechanism.

Key operative dates

• The AD becomes effective 25 October 2007. It requires inspections within 50 flight hours after that effective date and mandates replacement by 31 July 2008; prohibition on installing old P/Ns is effective from 31 July 2008 (Compliance section and effective-date line).

The text of the AD identifies a narrow, technically delimited group of actors who must act to satisfy the directive. The primary affected parties are:

Aircraft owners and operators

• Any owner or operator of an Agusta Model A119 helicopter that is fitted with hydraulic pipes P/N 109-0761-64-103 or P/N 109-0761-65-103 falls within the Applicability. Those operators must schedule, execute and document the inspections and eventual replacement required by the AD (Requirements 1-3 and Compliance 1-3).

Aircraft maintenance organisations and engineers

• Maintenance organisations and maintenance personnel who perform inspections, replacements and part installations on A119 helicopters will be responsible for carrying out the procedures set out in Agusta BT 119-22 Part I and Part II as the AD mandates (Requirement 1 and 2). They must be capable of identifying the specific P/Ns, executing the BT procedures, and ensuring correct installation of the new P/Ns to achieve the terminating action.

Parts suppliers, stockists and logistics chains

• Suppliers and stores that stock hydraulic pipes for Agusta A119 helicopters are affected by the installation prohibition that takes effect 31 July 2008 (Requirement 3, Compliance 3). After that date, the older P/Ns cannot lawfully be installed on any A119 (per the AD), which affects inventory management, spares provisioning, and disposal or re-labelling decisions for existing stock. The AD does not itself address sale or possession, only installation; the precise legal effect on sale or stocking is not expressed in the text beyond the installation prohibition.

Regulatory actor

• CASA, represented by its delegate Charles Lenarcic in this instrument, is the issuer and decision-maker for this AD (signature block and effective date). The AD document records the regulator’s imposed technical requirements and the effective date.

Engineers, repair stations and AMOs handling retrofit parts

• Those who carry out retrofit replacement using the new P/Ns must follow Part II of Agusta BT 119-22. Since the AD states installation of the new pipes is the terminating action for inspections, retrofit installers will affect an operator’s ongoing inspection burden.

Adjacent model stakeholders

• Although the immediate applicability is the A119 model, the Background notes that corrective actions were initially prompted by events in the A109E model and extended due to design similarity. Maintenance organisations working across Agusta model types must therefore be aware of the cross-model design relationship referenced in the Background.

Less direct stakeholders

• Insurers and safety managers of operators will be affected in economic and operational terms because the AD sets short inspection intervals and a mandatory replacement deadline. Flight scheduling and aircraft availability are materially affected by the required maintenance actions. The AD text itself does not quantify costs or downtime; it sets the obligation to inspect and replace.

Those not affected

• The AD’s Applicability is narrow; A119 helicopters not fitted with the two older P/Ns are not subject to the inspection/replacement requirements in this AD as written. The AD does not purport to require any action on other Agusta models, though it references A109E as the source of the safety concern (Background).

The AD specifies explicit duties for operators and maintainers in numbered Requirements and Compliance items. The document does not enumerate express legal rights such as appeal or review rights; it sets procedural and technical obligations.

Primary duties (as stated)

• Inspect the listed hydraulic pipes and replace where necessary, in accordance with Part I and Part II of Agusta BT 119-22 (Requirement 1). This is a continuing duty until the terminating action is taken.
• Replace the older pipe P/Ns 109-0761-64-103 and 109-0761-65-103 with new pipes P/N 109-0763-96-101 and P/N 109-0763-97-101 in accordance with Part II of Agusta BT 119-22 (Requirement 2). The AD states installation of the new pipes is the terminating action for the inspections required by the AD.
• Do not install the older hydraulic pipes P/N 109-0761-64-103 and P/N 109-0761-65-103 on any Agusta A119 helicopter (Requirement 3).

Timing and recurring duties (Compliance section)

• Initial inspection: within the next 50 flight hours after the effective date of the AD (Compliance 1). The effective date is 25 October 2007.
• Recurring inspections: thereafter at intervals not to exceed 100 flight hours (Compliance 1) until the terminating action is completed.
• Replacement timetable: no later than 31 July 2008 (Compliance 2). The prohibition on installing the older parts applies from 31 July 2008 (Compliance 3).

Procedural duty to follow a technical document

• The AD requires adherence to the procedures in Agusta BT 119-22 Parts I and II. The AD does not reproduce the technical steps; it makes compliance conditional on following those external documents (Requirement 1 and 2).

Contractual and operational consequences implicit in the AD

• The AD makes the installation of the new pipes the terminating action for inspection obligations. Practically, this creates a right of relief from recurring inspections for owners who complete the replacement, as the AD says the new installation terminates the inspection requirement. That relief is conditional on correct installation "in accordance with Part II".

Prohibitory duty

• From 31 July 2008 operators and maintainers must not install the older P/Ns on any Agusta A119 helicopter (Requirement 3 and Compliance 3). This is a forward-looking prohibitory obligation affecting future maintenance choices.

Rights and omissions in the text

• The AD text does not specify appeals, exemptions, or alternative means of compliance within its body. The AD cross-references Agusta BT and EASA AD for technical detail but does not provide an explicit mechanism in the instrument itself for alternative compliance routes. The AD does state that installation of the new parts is a terminating action; that functions as the prescribed path to cease inspections.

Who decides how to perform the work

• The AD allocates the technical method to Agusta BT 119-22 Part I and Part II. That places the choice of inspection and replacement procedures with the BT author (Agusta) whose instructions the AD makes normative.

Record-keeping and proof

• The AD text does not prescribe a particular format for records or documentation to show compliance. It follows that proof of compliance will rely on standard maintenance records and the execution of the mandated BT procedures, although the AD itself does not set record-keeping obligations in its text.

The text of the AD does not itself specify civil or criminal penalties for non-compliance, nor does it include a detailed enforcement regime. The instrument contains the prescriptive measures and effective dates, but makes no express provision in this printed text about fines, sanction mechanisms, or inspection/enforcement processes.

What the AD does state about enforcement-relevant facts

• The AD becomes effective on 25 October 2007, thereby creating a clear compliance start date for the duties it sets out (effective-date line).
• It prescribes mandatory actions: inspection and replacement procedures to be performed "in accordance with" Agusta BT 119-22 Part I and Part II, and a prohibition on installing the old P/Ns from a specific calendar date (Requirements and Compliance entries). These are framed as mandatory obligations by the language of the AD.

What is absent from the AD text

• There is no provision in this AD text that sets out specific penalties, fines, or criminal liability for failing to comply. There is also no text identifying which agency staff will carry out enforcement inspections, the record-keeping format, or administrative procedures for gaining an exemption or an alternative means of compliance.

Implications for operators and maintainers (drawn from the AD text)

• The AD’s mandatory language and clear effective dates create operational obligations that, operationally, must be carried out by owners, operators and maintenance providers. The AD signals that the installation of the new P/Ns is the prescribed path to satisfy the directive. Because the AD references specific technical procedures (Agusta BT 119-22 Parts I and II), failure to follow those documented procedures would be a failure to comply with the AD as written.

Practical enforcement considerations not specified in the text

• The AD does not set out how compliance will be verified, by whom, or whether documentation must be lodged with the regulator. The document does not set out a process for reporting defects or actions taken to CASA. These procedural enforcement matters are not contained in the printed AD and would typically be addressed in the regulator’s broader regulatory framework or operational practice, which are not reproduced here.

Reference to other authority

• The AD notes EASA AD 2007-0231 and Agusta BT documents but does not specify whether non-compliance with the AD will be treated in a particular way under other instruments. The AD contains the prescriptive obligations but leaves enforcement modalities and penalties unspecified within the text provided.

The AD itself refers to other technical and regulatory instruments and thereby creates points of interaction. The text, however, does not attempt to map broader statutory frameworks; it limits cross-references to the technical Bollettino and to an EASA AD.

Direct cross-references in the AD text

• Agusta Bollettino Tecnico (BT) 119-22 Part I and Part II: The AD makes compliance conditional on performing inspections and replacements "in accordance with Part I and Part II of Agusta Bollettino Tecnico (BT) 119-22" (Requirement 1 and 2). That makes the BTs an integral part of the compliance regime; actions prescribed in the BTs are therefore normative for compliance with this AD.
• EASA AD 2007-0231 dated 23 August 2007: The AD includes a note that this European AD "refers," thereby signalling that the CASA AD is aligned with an EASA instrument addressing a related concern (Requirement note). The AD explicitly states the EASA AD date.

Consequential operational interactions

• Because the AD makes Agusta BT the operative technical standard for inspections and replacements, operators must have access to those BT documents, and the content of those documents will govern specific procedures, tolerances and possibly part dispositions. Any variations in those BTs would therefore materially affect how the AD is executed. The AD itself does not reproduce the technical content of the BT.

Interaction by extension of measures across models

• The Background explains that Agusta issued BTs for the A109E in response to observed interference and that the AD extends the same mandatory corrective actions to A119 because of design similarity (Background). This creates a model-to-model interaction: technical actions developed for one model are made mandatory for another model by CASA’s AD on the basis of design similarity.

Interaction with parts supply and maintenance practice

• The AD’s prohibition on installing older P/Ns from 31 July 2008 interacts with contractual and supply arrangements. Spare parts inventories, stock rotation policies, and supply contracts that reference older P/Ns will need to be reconciled with the AD’s installation prohibition. The AD text does not address sale or possession of parts, only installation, so the precise legal effect on other commercial activities is not spelled out.

Absence of explicit statutory cross-linking

• The AD does not quote or cite provisions of domestic aviation safety statutes, regulations, or enforcement powers. It sets technical directives but does not in this printed text provide the statutory basis for enforcement, remedial powers, or penalties. Those interactions,between this AD and the enabling Civil Aviation legislation or regulations,are not described in the text provided.

Interaction with maintenance records and continuing airworthiness systems

• The AD prescribes actions that will need to be recorded in an operator’s continuing airworthiness records. The AD itself does not specify the format of those records or the authority that will audit them. Therefore, the AD relies on the broader maintenance-records regime that operators already maintain, although the AD text does not enumerate those obligations.

Practical takeaway from the AD’s cross-references

• Compliance with this AD requires an operational connection to the Agusta BT documents and an understanding that the AD aligns with a contemporaneous EASA AD. Operators should obtain and follow the referenced Agusta BT parts and take note of the EASA AD reference, because those documents supply the technical method and context the AD renders mandatory.

The document presented contains no subsequent amendment entries and contains only a single dated instrument. The AD is labelled AD/A119/10 Hydraulic Pipe Interference 11/2007 and records an effective date of 25 October 2007 and an issuer signature dated 6 September 2007. The printed AD itself contains no textual history of prior versions or later amendments.

What the AD text explicitly records

• Issuance details: Signed by Charles Lenarcic, Delegate of the Civil Aviation Safety Authority, dated 6 September 2007 (signature block).
• AD identifier and date: AD/A119/10 Hydraulic Pipe Interference 11/2007 appears as the identifier and edition date (top matter).
• Effective date: The AD states "This Airworthiness Directive becomes effective on 25 October 2007."

What is not present in the text

• The AD does not show any amendments, corrigenda, superseding ADs, or a revocation clause. There is no schedule of amendments nor any note indicating it replaces or supersedes any earlier CASA AD for the A119 model.
• No record of later action, such as extension of compliance deadlines, relaxation of the prohibition, or further technical corrections, is included in the provided text.

Implication for users

• As provided, the AD should be treated as a single, stand-alone instrument issued in late 2007 with the effective date shown. Any actions taken under it would have relied on those dates and the requirements as printed. Users seeking to know whether later amendments, exemptions, or revocations exist will need to consult the regulator’s current AD registry or other official sources because this text contains no amendment history.

Reference documents

• The AD references Agusta BT 119-22 Parts I and II and EASA AD 2007-0231; any updates to those external documents would not be reflected in this AD text unless CASA subsequently issued an amendment. The AD text does not note whether the Agusta BTs themselves have versions or amendment history; it simply mandates compliance with those Parts.

The AD text does not contain any information about litigation, judicial review, appeals, or disputes arising from the AD. There are no case names, decisions, or references to legal challenges in the instrument as provided.

What the absence in the text means

• The printed AD is a technical directive and in this copy it contains only prescriptive technical requirements, dates and cross-references to Agusta BT and EASA AD. It does not provide any record of litigation, nor does it include an administrative appeals mechanism within the text.

Practical note for readers

• If a practitioner needs to know whether the AD was subject to litigation, judicial review, or regulatory challenge, the information is not present in this document. That would require searching tribunal or court records, or the regulator’s public notices, none of which are included in the AD text itself.

This section flags practical traps and implementation frictions that arise directly from the AD text. Each point is rooted in the instrument’s wording.

Narrow applicability defined by part numbers

• The AD applies only to A119 helicopters fitted with P/N 109-0761-64-103 or P/N 109-0761-65-103 (Applicability). Aircraft with different hydraulic pipe P/Ns are not captured by this directive as printed. Operators must verify the exact P/Ns fitted to their aircraft; a misidentification could lead to unnecessary work or regulatory non-compliance.

Procedural compliance depends on an external technical document

• The AD requires inspections and replacement "in accordance with Part I and Part II of Agusta Bollettino Tecnico (BT) 119-22" (Requirement 1 and 2). The AD does not reproduce the technical procedures, so compliance requires access to and correct interpretation of the BT. If an operator does not have the BT or uses a different revision, they risk non-compliance.

Short initial inspection window, frequent intervals

• The AD calls for the first inspection "within the next 50 flight hours after the effective date" and then "thereafter at intervals not to exceed 100 flight hours" until replacement is done (Compliance 1). These are short windows in operational terms. Operators who do not schedule maintenance promptly may miss the initial inspection window.

Calendar deadline plus flight-hour regime

• The AD combines a flight-hour inspection regime with an absolute calendar deadline for mandatory replacement: "No later than 31 July 2008" (Compliance 2). This creates a dual timetable: even if an aircraft accumulates few flight hours, the operator must still effect replacement by the calendar date. Conversely, high-utilisation aircraft face repeated inspections until replacement.

Terminating action is the replacement in accordance with Part II

• The AD states installation of the new pipes P/N 109-0763-96-101 and P/N 109-0763-97-101 "in accordance with Part II of Agusta BT 119-22" is a terminating action for the inspections (Requirement 2). Operators must therefore ensure the replacement is performed exactly as specified in Part II; cosmetic or partial fixes may not satisfy the terminating-action requirement.

Prohibition on re-installation from a set date

• From 31 July 2008, the AD prohibits installing the older P/Ns on any A119 (Requirement 3 and Compliance 3). This affects stock management for maintenance organisations and raises the practical question of what to do with spare parts already in inventory. The AD text does not specify disposal or return procedures for existing stock.

Reference to EASA AD without reproducing its content

• The AD notes EASA AD 2007-0231 dated 23 August 2007 "refers" (Requirement note). The AD does not say how the EASA AD’s corrective measures align or differ in detail from CASA’s AD; operators must consult the EASA AD for the European context or to understand if there are technical variants.

Lack of explicit enforcement and record-keeping provisions

• The AD sets mandatory duties but does not stipulate record-keeping format, submission requirements, or penalties for non-compliance in this printed text. That can be a gap for operators seeking clarity on how to demonstrate compliance to the authority.

Ambiguity over scope of "replace as necessary"

• Requirement 1 uses the phrase "Inspect and replace as necessary, the hydraulic pipes ... in accordance with Part I and Part II of Agusta BT 119-22." The AD requires judgment about whether replacement is "necessary" based on the BT procedures. That creates potential for different judgments by different maintenance providers; precise criteria are located in the BT and not in the AD text.

Supply-side constraints

• The AD mandates replacement with specific new P/Ns. If those parts are in limited supply, operators may face procurement lead times that could impact compliance with the 31 July 2008 deadline or inspections frequency. The AD text does not address alternatives or temporary repairs.

No mechanism for alternative compliance in the AD text

• The AD prescribes a single compliance route (inspect per BT and install new P/Ns) and does not provide an alternative means of compliance within its text. Operators seeking alternative engineering solutions must look outside the AD for exemption or alternative approvals.

This section translates the AD’s prescriptive statements into an operational checklist based strictly on the AD text and referenced documents. Do not treat this as legal advice; it is a practical read of the AD’s required steps as printed.

1. Confirm applicability

• Identify Agusta Model A119 helicopters in your fleet and verify whether each is fitted with hydraulic pipes P/N 109-0761-64-103 or P/N 109-0761-65-103. The AD applies only to A119 helicopters fitted with those two P/Ns (Applicability).

2. Obtain the referenced technical documents

• Acquire Agusta Bollettino Tecnico (BT) 119-22 Parts I and II before performing any required inspections or replacements because the AD mandates compliance "in accordance with" those Parts (Requirement 1 and 2). Also obtain or review EASA AD 2007-0231 (noted in the AD) for context.

3. Schedule initial inspection within 50 flight hours

• The AD requires the first inspection "within the next 50 flight hours after the effective date of this AD" (Compliance 1). The effective date is 25 October 2007. Calculate each helicopter’s flight-hour usage and schedule the inspection to occur within that initial 50 flight-hour window.

4. Perform inspection per Agusta BT Part I/II

• Conduct the inspection following the procedures, acceptance criteria, and any machining or removal instructions set out in Agusta BT 119-22 Part I and Part II (Requirement 1). Where the BT identifies defects or interference, proceed according to the BT and the AD’s next steps.

5. Replace pipes if indicated or as mandatory

• Where the BT or inspection indicates replacement is necessary, replace the older P/Ns 109-0761-64-103 and 109-0761-65-103 with the new P/Ns 109-0763-96-101 and 109-0763-97-101, following Part II of Agusta BT 119-22 (Requirement 2). The AD states installation in accordance with Part II constitutes terminating action for ongoing inspections.

6. Maintain inspection cadence if replacement not yet done

• If the new pipes have not been installed, repeat inspections at intervals not to exceed 100 flight hours (Compliance 1). Maintain documented evidence that inspections were performed at the required flight-hour intervals.

7. Complete mandatory replacement by 31 July 2008

• Even if inspections show no immediate need to replace, ensure that replacement with the new P/Ns is completed no later than 31 July 2008 (Compliance 2). Replace before that date to avoid the transition to the prohibition regime and to obtain the terminating-action benefit earlier.

8. From 31 July 2008, do not install the old P/Ns

• After 31 July 2008, do not install hydraulic pipes P/N 109-0761-64-103 or P/N 109-0761-65-103 on any Agusta A119 helicopter (Requirement 3 and Compliance 3). Update maintenance procedures and parts ordering systems to prevent inadvertent installation.

9. Record and retain evidence of compliance

• While the AD text does not prescribe a specific record format, retain maintenance records showing P/N identification, inspection dates and findings (including flight hours at inspection), the BT procedures used, and details of any replacement including part numbers of newly installed pipes and reference to Part II of Agusta BT 119-22. Those documents will be the primary proof that the AD’s requirements were met.

10. Coordinate with parts suppliers and maintenance planning

• Order the specified replacement parts (P/N 109-0763-96-101 and 109-0763-97-101) in time to meet the 31 July 2008 calendar deadline and to avoid gaps in aircraft availability. Modify stock-control and procurement instructions to ensure the old P/Ns are not installed after the prohibition date.

11. Follow Agusta BT for technical details and terminating action validation

• Ensure that replacement installations are performed "in accordance with Part II of Agusta BT 119-22" because the AD ties the terminating-action status to compliance with that Part. Any deviation from Part II could mean the inspections are not terminated under the AD.

12. Consult the EASA AD if needed

• The AD notes EASA AD 2007-0231 (Requirement note). For operators who operate internationally or who need the European regulator’s technical advice, consult that EASA AD for further context and any additional technical detail or recommended practices.

13. Seek regulatory guidance for uncertainties

• The AD text does not set out alternative means of compliance, exemptions or enforcement protocols. If a situation arises (for example, inability to procure parts in time), engage the regulator or follow the regulator’s existing processes for relief or alternative compliance outside the AD text; the AD itself contains no exemption mechanism.

14. Treat the AD’s safety rationale as the operational trigger

• The Background states the risk: interference could damage hydraulic pipes and lead to loss of hydraulic system No. 1 in flight. Operators should treat this operational risk as the basis for prompt scheduling and thorough adherence to the Agusta BT procedures required by the AD.

Following these steps will align an operator’s actions with the AD requirements as printed. Keep copies of Agusta BT 119-22 Part I and Part II and any contemporaneous correspondence or parts procurement records that show when and how replacement work was completed.