AD/JETSTREAM/94 Amdt 2 - Frame 199 Wing Spigot Post Assembly Bolts

The AD rests on a small set of explicit technical and regulatory concepts set out in the short document. These are the controlling ideas that translate a manufacturer's maintenance instruction into a legally binding obligation.

• Applicability: The directive applies uniformly to "All Jetstream Series 3100 and 3200 aircraft" (Applicability). That is the scope: every airframe in those series covered by CASA regulation is subject to the directive.

• Normative technical document: The AD specifies a single normative means of compliance, the BAE Systems Service Bulletin 57-JA020740 Revision 2, or "later EASA approved revision" (Requirement). The service bulletin is therefore the technical specification for inspection methods, torque values, part numbers and replacement procedures. The AD does not itself list torque figures, part numbers or inspection intervals; it delegates technical detail to the service bulletin.

• Compliance timeline: There is a mandatory initial compliance deadline , "Before 31 March 2006, unless already accomplished" , followed by periodic inspections "as specified in the Requirement document" (Compliance). The AD has a formal effective date, "This Amendment becomes effective on 6 March 2006."

• Failure mechanism and safety consequence: The documented failure modes are fatigue resulting from either incorrect bolts or insufficient bolt tightening torque, and, per Amendment 2, incorrect washer installation that causes fretting and fatigue crack initiation leading to bolt bending and failure. The safety consequence is explicitly stated: "Failure of these bolts severely compromises the structural integrity of the wing to fuselage attachment" (Background). The AD therefore targets prevention of structural failure by addressing hardware, installation technique and torque application.

• Inter-regulatory linkage: The AD cross-references a UK Civil Aviation Authority airworthiness directive, "UK CAA AD G-2006-0003," and requires any later revision of the service bulletin to be "EASA approved." This establishes an explicit link between CASA's mandatory action, the manufacturer’s documentation, oversight by the European safety regulator and UK CAA findings.

• Amendment mechanics: The AD is an amendment (Amdt 2). The text summarises what Amendment 1 changed , addition of an alternative bolt part number, compliance note, and exclusion of run-down torque from torque figures , and explains why Amendment 2 is issued (the need to check washer installation per Revision 2 of the service bulletin). Thus the AD establishes a hierarchy: CASA AD mandates compliance with the service bulletin; amendments reflect updated technical understanding and cross-jurisdictional findings.

In short, the main concepts are scope (all Jetstream 3100/3200), mandatory compliance with a named service bulletin (or later EASA-approved revision), an initial compliance window and continuing inspection regime, and technical focus on correct bolt and washer installation and correct torque application to prevent fatigue and fretting that could compromise wing-fuselage attachment.

The AD explicitly identifies the fleet affected and, by implication, the parties who will incur obligations and operational impacts.

• Aircraft operators and owners: The Applicability clause is clear: "All Jetstream Series 3100 and 3200 aircraft" (Applicability). Operators or owners of any such airframe registered under CASA jurisdiction must ensure compliance. That responsibility typically resides with the operator, operator’s authorised person, or the aircraft owner depending on commercial arrangements.

• Maintenance organisations and certificated engineers: The Requirement delegates the specific inspection and corrective actions to the manufacturer service bulletin. Those procedures will be executed by licensed maintenance organisations and certificated maintenance personnel who must apply the specified torque procedures, install correct washers and bolts, and perform the inspections "as specified in the Requirement document" (Compliance). Because Amendment 1 excluded run-down torque in torque figures, technicians must follow the torque application method set out in the service bulletin, not informal run-down methods.

• Parts suppliers and logistics chains: The AD notes that Amendment 1 "added an alternative bolt part number." That change has direct implications for parts procurement and inventory management , suppliers and logistics managers will need to identify and supply the approved part numbers and possibly the alternative P/N introduced in Amendment 1.

• Regulatory and oversight bodies: CASA (through its delegate, David Punshon) issued the AD; the document references "UK CAA AD G-2006-0003" and requires that any later service bulletin revision be "EASA approved." Operators working across jurisdictions, or whose maintenance actions must also satisfy UK or EASA oversight, must be aware of the cross-reference.

• Safety and quality assurance functions within operators: Given that the background connects failures to incorrect bolts, low torque and incorrect washer installation, internal quality control, engineering, and airworthiness review functions will be directly involved in verifying compliance and in evaluating continued airworthiness implications.

• Potentially affected flight schedules and commercial activities: The Compliance timing , initial actions "Before 31 March 2006" and inspections thereafter per the service bulletin , introduces direct operational requirements for scheduling maintenance, which in practice will affect aircraft availability for carriers and charter operators that use Jetstream 3100/3200 aircraft.

The AD does not identify any exemptions or carve-outs. It also does not specify who pays for the work. Based solely on the text, the duty to act falls on the persons responsible for continuing airworthiness of the applicable aircraft (implicitly the operator/owner and authorised maintenance organisations), and the technical instructions for how to act are supplied by the referenced BAE Systems Service Bulletin 57-JA020740 Revision 2, or later EASA approved revision (Requirement).

This AD articulates a concise set of duties and a narrow procedural right regarding acceptable documentation.

Duties

• Comply with the service bulletin: The primary duty is to "Action in accordance with BAE Systems Service Bulletin 57-JA020740 Revision 2, or later EASA approved revision" (Requirement). The AD does not itself provide technical instructions; operators must follow the procedures, torque figures, part numbers and inspection intervals contained in that service bulletin or an EASA-approved later revision.

• Meet the initial compliance deadline: The AD requires completion of the specified action "Before 31 March 2006, unless already accomplished" (Compliance). That initial compliance obligation is time-limited and mandatory as of the AD’s effective period.

• Conduct ongoing inspections: After the initial action, there is an ongoing inspection duty: "Inspect thereafter as specified in the Requirement document" (Compliance). The AD therefore creates a continuing maintenance obligation, the specifics of which are located in the service bulletin.

• Address washer installation per Revision 2: Amendment 2 draws attention to the need in Revision 2 of the requirement document to "check for correct washer installation" because incorrect installation "could lead to fretting and fatigue crack initiation" (Background). Checking washer installation is therefore an explicit duty where Revision 2 is the operative document.

• Apply correct bolt part numbers and torque methods: Amendment 1 (summarised in the Background) "added an alternative bolt part number and a compliance note, and excluded run-down torque in the torque figures." That means the operative torque figures exclude run-down torque and that specific part numbers (including the alternative P/N) are the required parts; operators must install approved part numbers and apply torque consistent with the service bulletin's method.

Rights and procedural latitude

• Use of later EASA-approved revisions: The AD expressly allows an operator to comply with a later revision of the service bulletin, but only if that later revision is "EASA approved" (Requirement). This gives operators and maintainers limited procedural latitude to use updated technical procedures so long as those updates carry the requisite EASA approval.

• No explicit waivers or exemptions stated: The AD does not set out any right to seek a CASA exemption or alternative method of compliance within the text provided. The only procedural right recorded is the ability to use a later EASA-approved revision of the service bulletin.

Decision authority and administrative facts

• Issuing authority and effective date: The AD is issued by CASA and signed by a delegate, "David Punshon, Delegate of the Civil Aviation Safety Authority," with the document dated 3 March 2006 and the amendment effective 6 March 2006. That administrative detail establishes who issued the duty and when the legal obligation entered effect (Background; signature lines).

In sum, the AD imposes mandatory duties: perform the service bulletin tasks before 31 March 2006 unless already done, and follow the ongoing inspection schedule in the service bulletin. It narrowly recognises the right to rely on later EASA-approved revisions of the service bulletin, but does not itself confer additional rights or list enforcement or relief mechanisms within the text.

The text of the AD prescribes mandatory maintenance action and specifies compliance timing and the effective date, but it does not itself state civil or criminal penalties, nor does it set out an enforcement process in statutory terms. The document structure is that of a regulatory airworthiness directive issued by CASA; however, the AD contains only these enforcement-relevant facts within the supplied text:

• Mandatory compliance requirement: The AD sets enforceable technical duties: perform the actions "in accordance with BAE Systems Service Bulletin 57-JA020740 Revision 2, or later EASA approved revision" and complete the initial action "Before 31 March 2006, unless already accomplished" (Requirement; Compliance). By converting the service bulletin into an AD, CASA creates a duty with regulatory force.

• Effective date: "This Amendment becomes effective on 6 March 2006." The effective date indicates when the regulatory obligation must be recognised as binding in CASA’s administrative framework.

• Issuing authority: The AD is issued by CASA and signed by its delegate, "David Punshon" (signature block). The identification of the regulatory delegate is relevant to the locus of authority for enforcement actions within CASA.

What the AD does not specify

• No explicit penalties: The AD text provided does not include any explicit penalties for non-compliance, such as fines, suspension of certificates, or criminal sanctions. The document also does not identify the process for administrative enforcement, nor does it articulate appeal, relief, or alternative means of compliance in the text provided.

• No administrative enforcement steps set out: There are no procedural provisions in the given text describing monitoring requirements, reporting back to CASA, or required certification of compliance. The AD does not itself state whether operators must submit compliance reports to CASA or how CASA intends to verify compliance.

Cross-reference to other regulators

• The AD refers to the UK CAA AD G-2006-0003 and requires EASA approval for later revisions of the service bulletin. These cross-references indicate the AD is part of a network of oversight obligations across regulators; however, the AD itself does not spell out how CASA will coordinate enforcement with the UK CAA or EASA in the text provided.

Implications for enforcement practice (grounded in the document)

• The mandatory language and effective date indicate that CASA expects operators to complete the actions within the time window. Because the AD elevates the service bulletin to a regulatory instrument, failure to follow the specified actions would be non-compliance with the AD as drafted, though the AD text does not itself specify the sanctions that CASA might apply. The absence of explicit penalty language in this document means that any enforcement consequences would be determined by CASA’s broader regulatory framework and enforcement policies outside the text of this AD.

In short, the AD creates mandatory duties and an effective date and identifies the issuing authority, but it does not list penalties or enforcement procedures within the document itself. Any sanctions or enforcement pathways would rest with CASA’s broader statutory powers and practices, which are not set out in this AD text.

The AD explicitly links CASA’s mandatory direction to international and manufacturer documents, creating cross-jurisdictional and normative interactions.

• Reference to UK CAA AD: The document notes "Note: UK CAA AD G-2006-0003 refers" (Requirement). Amendment 2 is described as "issued in response to a new UK CAA AD." That cross-reference means CASA’s AD is not developing in isolation; it is responding to determinations made by another national regulator. For operators and maintainers, that linkage can require coordination to ensure actions satisfy both CASA’s AD and any UK CAA directives where relevant.

• Dependence on EASA approval: The Requirement allows compliance with "later EASA approved revision[s]" of the service bulletin. That creates a legal interface with EASA as the approvals authority for subsequent service bulletin revisions. If an operator wishes to rely on a later revision of BAE’s service bulletin, that revision must have EASA approval to be an acceptable means of compliance under this AD. Therefore CASA’s obligations and operator choices are constrained by EASA’s approval decisions.

• Normative delegation to manufacturer documentation: The AD makes the manufacturer’s service bulletin the operative technical standard. Where the AD delegates technical specifics to the service bulletin, legal compliance depends both on satisfying CASA’s directive and on properly reading and implementing the service bulletin. Any differences between the AD text and the service bulletin are resolved by following the AD’s instruction to comply with the service bulletin; the AD does not itself provide alternative technical prescriptions.

• Interaction with continuing airworthiness requirements: Although the AD does not set out continuing airworthiness law in the text, it creates a continuing inspection obligation "as specified in the Requirement document" (Compliance). That interacts with the operators' existing continuing airworthiness obligations under the Civil Aviation legislation framework (not detailed in this AD). The AD thus supplements or specifies particular actions within that broader legal obligation to maintain airworthiness.

• No stated conflicts or hierarchies beyond the references: The AD does not describe mechanisms for resolving conflicts between CASA and foreign airworthiness directives, nor does it set out how to seek an alternative means of compliance within the document. The AD’s instruction to use EASA-approved revisions if later implies that the CASA AD defers technical validation to EASA for later technical revisions while keeping the CASA AD as the mandatory instrument for CASA-regulated operators.

Operational implication of cross-references

• Where an operator’s fleet or maintenance is subject to multiple regulators, the AD’s references to UK CAA AD G-2006-0003 and EASA approvals mean obliged parties should ensure their compliance actions are compatible with those other regulators’ directions. The AD ties the technical means of compliance to manufacturer documentation and to EASA approval; it ties CASA’s regulatory action to contemporaneous action by the UK CAA. The text does not spell out dispute resolution, mutual recognition, or how to proceed when service bulletin revisions lack EASA approval, so operators must interpret the AD in the context of the applicable regulatory environment and possibly seek guidance from CASA where necessary.

In summary, the AD interacts with other laws and regulatory instruments by (1) responding to a UK CAA AD; (2) delegating technical prescription to a manufacturer’s service bulletin; and (3) requiring that later service bulletin revisions be EASA approved before they are acceptable as means of compliance under this CASA AD.

The AD text itself records an abridged amendment history and the reasons for the changes. The document is Amendment 2 to AD/JETSTREAM/94 and includes summary points about Amendment 1 and the current Amendment 2.

• Original AD base: The instrument is titled "AD/JETSTREAM/94" with the present text being "Amdt 2" (header). The supplied text does not include the full text of the original AD/JETSTREAM/94; it contains the amendment summary material relevant to Amendment 2.

• Amendment 1 (as summarised in the Background): Amendment 1 "added an alternative bolt part number and a compliance note, and excluded run-down torque in the torque figures." Those are the discrete technical changes recorded in the AD’s background narrative. The addition of an alternative bolt part number suggests the original parts list was expanded, the compliance note likely clarified how compliance should be demonstrated or timed, and the explicit exclusion of "run-down torque" from torque figures indicates a clarification or correction to torque application procedures.

• Amendment 2 (this document): Amendment 2 is "issued in response to a new UK CAA AD" and is specifically driven by Revision 2 of the BAE Systems service bulletin. The AD states that Revision 2 introduces the need "to check for correct washer installation." The AD explains the safety rationale for that change: "Incorrect installation could lead to fretting and fatigue crack initiation in the fitting followed by failure or bending loads in the bolt leading to failure of the affected bolts." Amendment 2 therefore adds washer installation checks to the mandated actions.

• Effective and signing dates: This Amendment is dated and signed: the document is signed by David Punshon, Delegate of CASA, on 3 March 2006, and the AD states "This Amendment becomes effective on 6 March 2006." The compliance initial deadline is "Before 31 March 2006," which establishes the practical implementation timeline of the amendment.

• Relationship to service bulletin revisions: The AD explicitly ties its operative requirement to "BAE Systems Service Bulletin 57-JA020740 Revision 2, or later EASA approved revision" (Requirement). The amendment history therefore includes the adoption of the service bulletin’s Revision 2 content into the AD by reference; any later service bulletin revisions are acceptable only if they are EASA-approved, which sets a gate for future changes to the mandated procedure.

• Cross-jurisdictional driver: Amendment 2 is recorded as responsive to a UK CAA AD (G-2006-0003). The AD’s amendment history thus reflects cross-jurisdictional regulatory feedback driving changes.

What the document does not provide about amendment history

• The AD summarises only the changes it deems material for this amendment. It does not supply the verbatim text of Amendment 1 or the original AD, nor does it provide a complete chronological log of each text change. For full traceability, one would need to consult the prior AD/JETSTREAM/94 text and Amendment 1 documents and the referenced service bulletin revision history.

In short, the amendment history recorded in the AD shows a progressive technical refinement: initial AD requirements were modified in Amendment 1 to add an alternative P/N, clarify compliance, and exclude run-down torque; Amendment 2 incorporates a washer-installation check driven by findings in the UK CAA AD and Revision 2 of the service bulletin.

The supplied AD document does not mention litigation, judicial review, or any case law. It contains no references to legal proceedings, appeals, or judicial determinations concerning AD/JETSTREAM/94 or its amendments. The Background, Requirement and Compliance sections set out technical and procedural obligations, and the signature block shows administrative issuance, but there is no record within this document of litigation history or contested enforcement proceedings.

Specifically:

• No cases named: The text contains no court decisions or citations to judicial authority. The document references only regulatory authorities (CASA, UK CAA, EASA) and the manufacturer (BAE Systems).

• No mention of disputes or challenges: There is no wording indicating that any party has challenged the AD, nor is there any indication of a prior or pending legal contest over the content, the necessity, or the impact of the mandate.

• Administrative issuance only: The AD is issued by a CASA delegate and dated; it is presented as an administrative airworthiness directive rather than a matter currently before courts.

For those seeking a record of litigation or legal challenges to this AD, the document provides no material. Any litigation history would need to be obtained from external sources such as court records, regulator enforcement records, or legal databases; nothing of that nature is contained within the AD text provided.

The AD’s brevity and its reliance on an external service bulletin create several practical and interpretive pitfalls that operators and maintenance organisations should note. The following items are directly grounded in the AD text.

• Normative delegation to the service bulletin: The AD requires action "in accordance with BAE Systems Service Bulletin 57-JA020740 Revision 2, or later EASA approved revision." The AD itself does not reproduce the technical details, torque figures, or inspection intervals. The practical consequence is that compliance requires careful reading of the service bulletin and confirmation that the correct revision (Revision 2, or an EASA-approved later revision) is being followed. Using an incorrect revision would risk non-compliance.

• Tight initial compliance window: The AD became effective on 6 March 2006 and imposes an initial compliance deadline "Before 31 March 2006." That leaves a limited window in which to source parts, schedule maintenance slots and perform inspections. The AD does not provide grace periods or staged compliance in the text provided.

• Run-down torque exclusion: Amendment 1 "excluded run-down torque in the torque figures." Technicians familiar with run-down torque methods must note that the AD explicitly disallows run-down torque when applying the specified torque figures. Misinterpretation of torque application method could lead to improper tightening and failure to address the fatigue risk.

• Washer installation requirement added in Revision 2: Amendment 2 highlights the need to "check for correct washer installation" because incorrect installation "could lead to fretting and fatigue crack initiation" and eventual bolt or fitting failure. A seemingly minor assembly detail , washer orientation or seating , is elevated to a safety-critical check. Reliance on visual or cursory checks could be insufficient if the service bulletin specifies particular checks or measurements.

• Alternative part number introduced in Amendment 1: Amendment 1 "added an alternative bolt part number." While that can ease parts shortages, it also creates a potential inventory and traceability issue: maintainers must ensure the installed bolts match the permitted P/Ns in the applicable revision of the service bulletin. Installing a non-approved bolt P/N would be a compliance failure.

• Cross-jurisdictional references: The AD refers to UK CAA AD G-2006-0003 and limits acceptable later service bulletin revisions to those that are "EASA approved." Where an operator’s aircraft operate in multiple jurisdictions or where review bodies interpret approvals differently, there is a potential for confusion about which technical revision is acceptable. The AD does not provide a mechanism for resolving such jurisdictional divergence.

• No enforcement specifics in the AD text: The AD imposes mandatory duties but does not describe reporting, approval of alternative methods, or penalties in the text provided. Parties who are uncertain about whether a proposed alternative method of compliance is acceptable must seek clarification from CASA; the AD itself contains no process for such relief.

• Impact on aircraft availability: While the AD does not itself say so, the requirement to inspect, tighten or replace bolts and washers before the compliance date may require removal from service. Operators should not assume the work is trivial or can be performed between flights without scheduling consequences; the AD’s wording ("Action in accordance with ... Service Bulletin") implies the work must meet the service bulletin’s instructions, which may call for specific facilities or stand-alone maintenance events.

• Subsequent revisions require EASA approval: If BAE issues further revisions, those later revisions will not automatically be acceptable for compliance unless EASA approves them. That gating mechanism can slow adoption of a newer maintenance technique if EASA approval is pending.

Each of these "gotchas" flows directly from text in the AD: the delegation to the service bulletin, the explicit exclusion of run-down torque, the added washer check in Revision 2, the alternative P/N, the cross-reference to UK CAA AD G-2006-0003, and the requirement for EASA approval for later service bulletin revisions. Operators and maintainers should treat those items as concrete constraints on how the AD is implemented.

The AD prescribes a narrowly framed compliance pathway. The document’s operative instruction is to carry out the actions set out in the BAE Systems Service Bulletin 57-JA020740 Revision 2, or a later revision only if it is "EASA approved" (Requirement). The AD sets an initial deadline and establishes a continuing inspection obligation. The following steps state what the AD requires and the practical actions the AD text directly supports.

1. Identify applicability: Confirm whether the aircraft is within the scope: "All Jetstream Series 3100 and 3200 aircraft" are covered (Applicability). If the aircraft is in that series, the AD applies.

2. Obtain the operative service bulletin: Acquire BAE Systems Service Bulletin 57-JA020740 Revision 2. If a later revision exists, ensure it has EASA approval before relying on it as the means of compliance (Requirement).

3. Carry out the initial action before the deadline: Complete the action(s) specified in the service bulletin "Before 31 March 2006, unless already accomplished" (Compliance). The AD places this initial obligation on operators responsible for the applicable aircraft.

4. Particular tasks to confirm per the service bulletin and AD summaries:

   • Verify bolt part numbers: Amendment 1 added "an alternative bolt part number"; ensure the installed bolts are among the approved P/Ns in the operative revision of the service bulletin (Background).
   • Apply specified torque correctly: The AD notes Amendment 1 "excluded run-down torque in the torque figures." Therefore apply torque in the manner the service bulletin specifies and do not rely on run-down torque methods that the amendment excluded.
   • Check washer installation: Revision 2 requires checking for "correct washer installation" because incorrect installation can cause fretting and fatigue crack initiation leading to bolt or fitting failure (Background). Ensure washer orientation, seating, and any specified washers are installed per the service bulletin’s instructions.

5. Implement any required replacements or corrective actions: If inspections reveal incorrect bolts, incorrect washers, or incorrect torque, perform the corrective actions described in the service bulletin, which may include replacing bolts with approved P/Ns, replacing washers, and applying correct torque.

6. Implement ongoing inspections as specified: After the initial action, "Inspect thereafter as specified in the Requirement document" (Compliance). Follow the inspection intervals and techniques specified in the service bulletin for continued compliance.

7. Coordinate approvals where needed: If you intend to use a later revision of the service bulletin, confirm EASA approval of that revision before relying on it for compliance. Also take account of any related UK CAA directives referenced in the AD: "Note: UK CAA AD G-2006-0003 refers" (Requirement).

8. Document completion: While the AD text itself does not specify reporting or record submission procedures, compliance requires that the action be demonstrably performed before the deadline and that ongoing inspections take place as specified. Operators should ensure that the maintenance performed is recorded and that any airworthiness records required by applicable civil aviation regulations are updated in accordance with prevailing regulatory record-keeping requirements (the AD’s instruction to "action in accordance with the Service Bulletin" implies following the service bulletin’s procedural steps).

9. Seek clarification from CASA if ambiguous: The AD does not set out processes for alternative means of compliance or waivers within the text supplied. If an operator anticipates needing an alternative method or relief, they should seek formal guidance from CASA.

10. Monitor for further regulatory updates: The AD is itself an amendment (Amdt 2). Manufacturers or regulators may issue further revisions; operators should monitor for additional CASA ADs or for EASA-approved revisions to the service bulletin.

These steps are drawn directly from the AD’s Requirement, Compliance and Background sections. They are not an exhaustive maintenance manual; the specific technical procedures, torque figures, part numbers and inspection intervals are found in BAE Systems Service Bulletin 57-JA020740 Revision 2 and any later EASA-approved revision used for compliance. The AD makes compliance with that document mandatory and fixes a firm initial compliance date and the requirement for continuing inspections as specified in the service bulletin.