AD/ECUREUIL/70 Amdt 1 - Main Servocontrol Rods

The Directive uses a small set of operational concepts to translate a safety defect into enforceable obligations. Applicability is narrowly defined by airframe model and by part numbers and serial numbers of servocontrols. The tables list specific part numbers and serial numbers; Table 1 isolates TRW-SAMM Main Servocontrols part numbers SC 5083 and SC 5084 with a limited set of serial numbers, while Table 2 lists multiple main and tail servocontrol part numbers (SC5081-1, SC5082-1, SC5083, SC5084, SC5071-1, SC5072) with an extensive list of serial numbers and ranges (Applicability, Table 1, Table 2).

The Directive distinguishes checked or reconditioned servocontrols by a visible marking, the letter V engraved to the right of the part number on the identification plate (Note 1). The tables explicitly apply to part numbers without the suffix V, so identification depends on plate markings. The Requirement structure uses discrete mandatory steps: inspect, replace, and prohibit future installation (Requirement 1 to 4). The Compliance section ties these actions to safety-critical timing: "before further flight" for immediate risks, a quantified interval (550 flight hours or 24 months) for lower-immediacy replacements, and an immediate installation ban from the effective date for prevention of recurrence (Compliance).

The Directive also contains a cross-reference to a foreign airworthiness directive, DGAC AD 2003-099(A), indicating that the measure follows or is coordinated with regulatory action by the French authority (Note 2). The Background statement identifies the causal mechanism of concern: a manufacturing defect in a batch of rods of the main servocontrol, and sets out the risk outcome, that rod failure would lead to loss of control of the helicopter (Background).

Operationally relevant concepts for implementers include precise part/serial number identification, differentiation between standard and reconditioned parts via the V engraving, the obligation to source and fit servocontrols that are not listed in either table, and the defined compliance windows. The Directive does not, in itself, specify acceptable replacement parts beyond the negative formulation "not listed in Table 1 or Table 2" (Requirement 2 and 3), so compliance requires positive confirmation that candidate replacement parts do not appear in the tables and, where relevant, that their identification plates carry the V suffix if they are TRW-SAMM reconditioned units.

The Directive targets owners, operators, maintainers and component suppliers involved with Eurocopter AS 350 series helicopters that have the specified servocontrol part numbers and serial numbers installed. The Applicability section expressly states the airframes covered: "All AS 350 helicopters, versions B, BA, B1, B2, B3, BB and D, fitted with servocontrols listed in Table 1 and Table 2 of this Directive." An immediate practical implication is that any operator of those AS 350 variants must ascertain whether their aircraft are fitted with servocontrols listed in the tables; if so, they must undertake the mandated checks and, where required, replacement actions (Applicability; Requirement 1 to 3).

Maintenance organisations and licensed engineers will be the parties that perform the physical checks and replacements, and they must use identification plates to match part numbers and serial numbers, including the presence or absence of the "V" engraving described at Note 1. Suppliers who provide servocontrols to AS 350 operators are affected by the installation prohibition: from the effective date, parts listed in Table 1 and Table 2 must not be installed on the aircraft (Requirement 4). That may require suppliers to segregate stock and ensure that serial numbers on parts supplied are not on the banned lists.

Regulatory decision-makers within CASA are the issuers and enforcers: the AD is issued by the CASA delegate under subregulation 39.1(1) of CASR 1998 and signed by the delegate (front matter; signature). The Directive also references DGAC AD 2003-099(A), which may affect operators or maintainers who rely on common parts supply chains or who operate under multiple authorities.

Financially, the Directive imposes replacement costs on the operators or owners of affected helicopters because it mandates removal and replacement of listed servocontrols with parts not listed in the tables (Requirement 2 and 3). The Directive does not state whether costs will be compensated by manufacturers, suppliers or insurers; it simply imposes the obligation to check and replace. The timelines allocate cost pressure unevenly: immediate removal of Table 1 items before further flight creates an urgent capital requirement for any operator with those parts installed; Table 2 parts have a longer compliance window (550 flight hours or 24 months), distributing replacement costs across time (Compliance).

Finally, airworthiness and operational availability are affected. Where replacement is required before further flight, aircraft downtime and scheduling must accommodate inspections and parts swaps; for Table 2 items, operators have a defined window to plan replacements. The Directive is explicit that the unsafe condition is rod failure leading to loss of control; the safety imperative underlies the regulatory imposition (Background).

The Directive imposes mandatory duties on operators, maintainers and suppliers, and it creates limited negative rights (such as a prohibition on installation). The primary duties are set out as four numbered Requirements.

Duty to inspect: Requirement 1 requires that, unless previously accomplished, operators check whether any servocontrols listed in Table 1 and Table 2 are installed on the "aeroplane". The Directive applies to helicopters but the requirement text uses the term "aeroplane"; the document supplies no clarification or amendment of that terminology (Requirement 1). The duty is immediate in force for those who have not already completed the check, and Compliance requires the check to be done "before further flight" (Compliance item 1).

Duty to replace Table 1 servocontrols: Requirement 2 mandates replacement of any servocontrols listed in Table 1 with servocontrols not listed in Table 1 or Table 2. The action must be completed before further flight (Compliance item 2).

Duty to replace Table 2 servocontrols: Requirement 3 mandates replacement of servocontrols listed in Table 2 with servocontrols not listed in Table 1 or Table 2 within 550 flight hours or 24 months, whichever occurs first, after the effective date of the Directive (Compliance item 3).

Duty not to install listed servocontrols: Requirement 4 establishes a prohibition from the effective date: "Do not install any servocontrols listed in Table 1 or Table 2 of this Directive" (Requirement 4; Compliance item 4).

Identification duty: Note 1 creates a practical duty to inspect identification plates for the V engraving because the tables only list parts without the suffix V. Operators must therefore interpret identification plates correctly to determine whether a component is subject to the Directive (Note 1).

Rights and limits: The Directive does not create affirmative entitlements such as compensation, deferrals or alternative compliance pathways within its text. It does not specify acceptable replacement part numbers or approved repair stations; it only requires replacements be with servocontrols not listed in the tables. The document does not grant discretion to individual operators to delay required action beyond the specified compliance windows. The only discretion evident in the text is to exclude parts that are already known to be reconditioned and marked with the V suffix, because those are not listed in the tables (Note 1). No variance or special approval process is described in the AD itself.

Authority and issuance: The AD is issued by the CASA delegate under subregulation 39.1(1) of CASR 1998 and signed by the delegate, indicating the regulatory source of the duties (front matter; signature). The Directive also cross-references a DGAC AD (Note 2), but it does not in itself create rights that arise from that cross-reference.

Recordkeeping and proof of compliance: While the AD requires checks and replacements with fixed deadlines, it does not include express instructions for how to document compliance or produce certificates; those practical obligations are implicit in the nature of an airworthiness directive but are not spelled out in the document.

The Directive states that it is issued under subregulation 39.1(1) of CASR 1998 (front matter), indicating the statutory basis for the AD. The instrument itself mandates inspection, removal, replacement and prohibition measures and sets compliance deadlines; it does not, within the text provided, specify particular monetary penalties, enforcement procedures, or sanctions for non‑compliance.

Because the AD is issued under CASR 1998 subregulation 39.1(1), enforcement mechanisms and penalties, if any, would flow from the regulatory framework in CASR 1998 and related enforcement provisions, but those provisions are not reproduced in this Directive. The Directive therefore creates mandatory obligations but does not itself identify the sanctions that attend breach of those obligations. The AD is signed by the CASA delegate and notified in the Commonwealth of Australia Gazette on 9 May 2003 (signature; Gazette notification), which signals formal regulatory effect, but the instrument is silent about the enforcement process, inspection authority, or the means by which CASA would verify or compel compliance.

Operationally, the Directive prescribes time‑bound actions that, if not followed, would leave the aircraft in breach of the AD. The Compliance section attaches precise timing to each requirement: checks and replacement of Table 1 servocontrols before further flight, replacement of Table 2 servocontrols within 550 flight hours or 24 months, and the installation prohibition effective immediately (Compliance items 1-4). Non‑compliance with these time limits would constitute non‑observance of the Directive as issued, but the AD does not itself set out the administrative or enforcement route. The reference to DGAC AD 2003-099(A) (Note 2) shows coordination with another authority but does not add enforcement terms.

In short, this Directive creates mandatory duties enforceable under the statutory head cited, with specific timing and content obligations, but it does not include within its text any enumerated penalties or enforcement procedures. To determine precise sanctions, remedial powers or inspection regimes, a reader must consult the CASR 1998 provisions and CASA enforcement policy, neither of which is contained in the provided text.

The AD explicitly situates itself within the CASR 1998 regulatory framework by stating it is issued under subregulation 39.1(1) of CASR 1998 (front matter). That is the only domestic statutory reference included in the text. The Directive also refers to DGAC AD 2003-099(A) (Note 2), indicating a cross‑reference to the French Directorate General for Civil Aviation's airworthiness action. Beyond these two references, the AD contains no other statutory cross‑references, transitional provisions, exemptions, or instructions that link its requirements to other specific legislation or regulations.

In practice, the AD imposes obligations that intersect with maintenance standards, airworthiness certification and operational rules that sit elsewhere in the regulatory framework, but those instruments are not reproduced here. The AD defines the safety action required for particular parts on specified helicopters, leaving implementation details such as recordkeeping, release to service after replacement, and documentation of compliance to be handled under usual maintenance and certification processes. The AD does not itself set out how compliance must be recorded, nor does it identify the forms or approvals required for fitting replacement parts. It also does not identify whether the replacement parts must be new, approved overhauled or from a particular supplier; it simply requires replacements not listed in the tables (Requirement 2 and 3).

The reference to DGAC AD 2003-099(A) shows regulatory coordination between CASA and the French authority; the Directive does not state whether compliance with the DGAC AD alone satisfies this Directive or whether the requirements are identical. The AD makes no claim that compliance with foreign directives is a defence to non‑compliance with CASR 1998. The text is silent on interactions with warranty law, product liability, supplier obligations, or insurance coverage for replacement costs. The AD does not provide remedies, indemnities or compensation mechanisms that would modify commercial relationships between operators and manufacturers or suppliers.

Where parts bear the V suffix indicating reconditioning by TRW-SAMM, the AD excludes such parts from the tables because tables list part numbers without the suffix V (Note 1). That creates an interaction between the AD and industry repair/reconditioning practice: a reconditioned unit that carries the V engraving is not listed and therefore not captured by the tables in this Directive. The AD does not elaborate further on acceptable reconditioning standards or any necessary approvals for reconditioned parts.

Overall, the Directive creates a discrete safety obligation that must be implemented alongside other airworthiness, maintenance and operational regulatory requirements; it references the statutory power used to issue the AD and a DGAC AD, but it leaves specific interactions with the broader legal and regulatory framework to be resolved by reference to those external instruments, which are not reproduced in the provided text.

The document before you is Amendment 1 to AD/ECUREUIL/70. The Amendment is dated and signed on 6 May 2003 and the Amendment specifies that it becomes effective on 9 May 2003 (signature; "This Amendment becomes effective on 9 May 2003"). The text states that the original issue of this Directive became effective on 3 December 2001 (Background). The Amendment is prompted by detection of additional defects in servocontrols with additional part numbers and serial numbers; that is the stated reason for the amendment (Background).

Key points in the contained amendment history are:

• Original AD/ECUREUIL/70 first became effective 3 December 2001. The provided text does not reproduce the original AD in full but notes that the original issue had that effective date (Background).

• Amendment 1 revises the list of affected servocontrol part numbers and serial numbers by adding further entries in Table 1 and Table 2. The front matter states that the delegate revokes AD/ECUREUIL/70 and issues the following AD as amended, indicating that Amendment 1 replaces the prior AD text (front matter).

• The Amendment’s effective date is expressly stated as 9 May 2003 (effective date clause).

• The Amendment is signed by the CASA delegate Jim Coyne on 6 May 2003 and is notified in the Commonwealth of Australia Gazette on 9 May 2003 (signature; Gazette notification).

The Amendment explains its cause: initial issuance followed detection of a manufacturing defect in a batch of rods of the main servocontrol, and Amendment 1 responds to further defects discovered in servocontrols with additional part numbers and serial numbers (Background). The document does not provide a running history of prior serial numbers added or removed, nor does it include an annex showing redline changes versus the earlier AD text. It records only the effective dates and the reason for the amendment.

No subsequent amendments or revisions beyond Amdt 1 are contained in the provided text. The Directive also cross-references DGAC AD 2003-099(A) but does not state whether that AD post-dates the original or the amendment or whether the DGAC action prompted Amendment 1; the only linkage is a reference (Note 2). The document does not include transitional arrangements beyond the stated compliance windows nor any grandfathering for actions previously taken, except that Requirements begin "Unless previously accomplished", meaning that operators who already carried out the checks and replacements prior to the amendment are not required to repeat them (Requirement 1, 2 and 3 language).

The Directive as provided does not include any litigation history. It contains no references to judicial decisions, challenges, appeals or reviews related to the AD or to disputes arising from its implementation. The document is a standalone airworthiness directive: it records the issuance, the technical particulars (tables of part numbers and serial numbers), the requirements and compliance times, the signature of the CASA delegate and the effective dates, but it does not recount any litigation, nor does it cite precedents or complaints.

Because the text does not include any legal challenge record, there are no named court cases, administrative appeals, or results to summarise from this source. The document does, however, include a cross-reference to DGAC AD 2003-099(A) (Note 2), which may be relevant to any cross-jurisdictional actions, but the AD itself does not disclose whether that foreign action has been the subject of litigation.

Practically, the absence of litigation history in the document means that a reader seeking to know whether the Directive has been contested, varied, or the subject of judicial review must consult external records, court databases, CASA enforcement records and, if relevant, records of DGAC, none of which are contained in this document. The Directive does not provide an administrative appeals mechanism within its text nor indicate whether operators who believe a requirement is inapplicable have a defined internal CASA process for seeking relief. The only procedural language in the AD is the "Unless previously accomplished" qualifier in the Requirements, and explicit compliance timeframes; the AD does not set out dispute resolution or appeal pathways.

In short, the AD supplied contains no litigation or dispute history. For any litigation details, a reader must look beyond this instrument to jurisdictional administrative or judicial records, which are not reproduced here.

The Directive contains a number of technical and drafting features that create handling risks for implementers.

1. Terminology mismatch: The Applicability and title refer to helicopters, specifically Eurocopter AS 350 (Ecureuil) Series Helicopters, while Requirement 1 uses the term "aeroplane" ("check whether any of the servocontrols ... are installed on the aeroplane") (Applicability; Requirement 1). The Directive does not reconcile this terminology. Operators should note that the AD is aimed at AS 350 helicopters despite the single use of "aeroplane" in Requirement 1.

2. Dependence on identification plate markings: Note 1 makes the exclusion of reconditioned units contingent on the presence of a V engraved to the right of the part number on the identification plate. The tables list part numbers "without the suffix 'V' " (Note 1; Table headings). Consequently, two servocontrols with identical part numbers and serial numbers could be treated differently depending on whether a V is present on the plate. Operators must rely on accurate visual inspection of identification plates.

3. Negative formulation of replacement: Requirements 2 and 3 require replacement "with servocontrols not listed in Table 1 or Table 2." The AD does not specify acceptable replacement part numbers or give positive guidance about approved alternatives. It is therefore incumbent on operators and maintainers to ensure candidate replacement parts do not appear in either table and to document that fact. The AD gives no direction on whether reconditioned (V) parts are acceptable as replacements; given Note 1, they would not be listed in the tables if they carry the V engraving, but the AD is silent on the Standards those reconditioned parts must meet.

4. Serial number formats and potential for misreadings: The serial numbers in Table 2 include leading zeros (for example "045"), alphanumeric suffixes "M" in many entries, comma-separated individual numbers, ranges with "to", inclusive language for some ranges and large spans (e.g. "1291 to 1499"). Misinterpretation of formatting, failure to match leading zeros, or failure to recognise the meaning of "M" could lead to incorrect conclusions about applicability. The tables also mix upper and lower bounds and discrete entries; strict, plate-level matching is required.

5. Installation prohibition timing: Requirement 4 provides a flat prohibition: "Do not install any servocontrols listed in Table 1 or Table 2 of this Directive." Compliance item 4 states this prohibition is effective "From the effective date of this Directive." The AD does not explicitly address whether an operator may temporarily install a servocontrol that is later removed, or whether installation on non-AS350 types is implicated. The plain wording prohibits installation on the aircraft to which the AD applies from the effective date.

6. Differentiated compliance windows: Table 1 replacements and the initial inspection must be performed before further flight (Compliance items 1 and 2), whereas Table 2 replacements have a longer compliance window (550 flight hours or 24 months) (Compliance item 3). That tiering creates immediate grounding risk for aircraft with Table 1 parts, but gives planning time for Table 2 parts. Operators must ensure they apply the correct compliance timeframe to each part installed.

7. No specification of documentary proof or forms: The AD does not state how to certify or document compliance. Operators should not assume that particular forms or logbook entries are mandated by the AD itself; common practice would be to record the check and replacement in maintenance records, but the AD does not prescribe the format.

8. Cross-reference without guidance: Note 2 refers to DGAC AD 2003-099(A). The Directive provides no detail on whether compliance with that DGAC AD is sufficient, identical, or supplementary; users must consult the DGAC AD independently to understand overlap.

9. Revocation language: The front matter states the CASA delegate revokes AD/ECUREUIL/70 and issues the following AD. The text does not reproduce the prior AD in full, so operators must be careful to rely on this Amendment as the operative instrument effective 9 May 2003.

10. Replacement part provenance: Because the AD does not require a specific manufacturer's approval, overhaul approval, or part number for replacement parts, operators will need procedures to verify that replacement servocontrols are acceptable and not listed in the tables. The AD’s negative framing leaves open the question of whether parts of the same part number but with V engraving are acceptable as replacements; the text suggests they are not listed and therefore not captured by the table lists, but it does not state explicitly that those parts are compliant replacements.

These features produce concrete operational risks: misidentification of parts, failure to comply within the correct timeframe, inadvertent installation of banned parts, and uncertainty about acceptable replacements. The Directive’s phrasing places the onus on operators and maintainers to interpret identification plates and serial number formatting accurately and to document actions to demonstrate compliance.

The Directive sets out concrete actions and deadlines; compliance requires operational steps tied to parts identification, removal and replacement, recordkeeping and scheduling.

1. Identify affected airframes: Confirm whether the operator has one of the specified airframe types listed in Applicability: AS 350 versions B, BA, B1, B2, B3, BB and D. If an aircraft is one of these types, proceed to the component-level check (Applicability).

2. Inspect identification plates: For each helicopter of the applicable type, inspect the servocontrol identification plate(s) to capture the part number and serial number. The tables list part numbers without the suffix V; Note 1 states servocontrols reconditioned by TRW-SAMM are identified by a V engraved to the right of the part number. Treat any servocontrol whose identification plate shows a V suffix as not listed in the tables for the purpose of matching (Note 1; Table headings).

3. Match serial numbers exactly: Compare part numbers and serial numbers to the entries in Table 1 and Table 2. Pay careful attention to formatting: leading zeros (for example "045"), alphanumeric suffixes such as "M", individual number listings and inclusive ranges (Table 1; Table 2). Use plate data rather than maintenance records alone where records are ambiguous.

4. Timing actions: If any servocontrol listed in Table 1 or Table 2 is installed, act as follows:

   • For any servocontrol listed in Table 1: replace it with a servocontrol not listed in Table 1 or Table 2 before further flight (Requirement 2; Compliance item 2).
   • For any servocontrol listed in Table 2: replace it with a servocontrol not listed in Table 1 or Table 2 within 550 flight hours or 24 months, whichever occurs first, after the effective date of the Directive (Requirement 3; Compliance item 3).
   • Regardless of category, if the initial inspection has not yet been done, perform it before further flight (Requirement 1; Compliance item 1).

5. Prohibit installation of listed parts: From the effective date of the Directive, do not install any servocontrols listed in Table 1 or Table 2 on the aircraft covered by the AD (Requirement 4; Compliance item 4). Ensure parts procurement, storeroom control and supplier communications prevent inadvertent supply or fitting of listed parts.

6. Select replacement parts carefully: Replace affected servocontrols only with parts that are not listed in Table 1 or Table 2. Because the AD does not specify approved replacement part numbers, ensure replacement units are positively identified and documented as not appearing in the tables. Where a candidate replacement is reconditioned by TRW-SAMM and carries the V engraving, it will not be listed in the tables per Note 1, but the AD does not address the quality standard for such reconditioned parts; maintainers should ensure any replacement parts meet applicable airworthiness standards and approvals under usual maintenance practices.

7. Document compliance: Although the AD does not prescribe a record format, maintain contemporaneous maintenance records showing the inspection results, part identification plate readings, serial numbers matched against the tables, replacement actions (part numbers, serial numbers, dates, approval and release to service), and compliance with the time limits set in the AD. These records will be necessary to demonstrate that the obligations "before further flight" and within the specified hours or months were met.

8. Coordinate with suppliers and maintenance providers: Notify parts suppliers, overhaul providers and maintenance organisations that parts listed in Table 1 and Table 2 must not be fitted from the effective date, and segregate inventory where necessary. If parts are received with uncertain identification plates, do not fit them until identity is verified.

9. Reference DGAC AD as needed: The Directive refers to DGAC AD 2003-099(A) (Note 2). Consult that foreign AD where relevant to understand any parallel or complementary requirements, particularly if parts or maintenance work originate from jurisdictions affected by the DGAC AD.

10. Plan scheduling and costs: For servocontrols requiring replacement before further flight, arrange immediate maintenance slots and parts procurement. For Table 2 parts, plan replacements within the 550 flight hours or 24 months window to avoid last-minute capacity constraints. Budget for parts and labour since the AD requires replacement but does not address cost allocation.

11. Apply the "Unless previously accomplished" qualifier: If the check and replacements were already completed prior to the effective date, that work satisfies the "Unless previously accomplished" qualifier contained in the Requirements (Requirement 1-3 language). Ensure records demonstrate prior completion to rely on that qualifier.

12. Verify legal status and enforcement practice: The AD is issued under CASR 1998 subregulation 39.1(1) (front matter). For clarity on enforcement, sanctions, or any procedures to seek relief or alternative actions, consult CASA or the statutory instrument, since this AD does not specify enforcement mechanisms.

Following these concrete steps will implement the mandatory elements of the Directive: identification, timely replacement, prohibition on installation of listed parts and documentation of compliance in maintenance records, noting that the AD’s negative framing of acceptable replacements requires particular care in verifying that substitute parts do not appear in Table 1 or Table 2.