AD/EMB-145/2 - Vent and Pilot Valve Electrical Wiring Conduits

The AD rests on three core technical and regulatory concepts drawn directly from its text: (1) hazard elimination by substitution of materials, (2) prescriptive compliance via manufacturer service bulletins subject to regulator approval, and (3) a clearly stated compliance window measured in flight hours or calendar time.

1. Hazard elimination by substitution of materials. The Background explains the problem identified by ANAC: "there is a possibility of sparks being generated due to internal contact between the wires of the vent and pilot valves of the pressure refuelling system inside the wing fuel tanks and the metallic tubes that enclose them, which may lead to a possible ignition source in the vicinity of the fuel tanks." The AD responds by requiring replacement of metallic tubes with "non-conductive hoses (Teflon)" (Requirement, Background). That is a substitution remedy intended to remove metallic contact paths inside fuel tanks.

2. Prescriptive compliance via Embraer Service Bulletins subject to ANAC approval. The AD does not itself set detailed step-by-step procedures; instead it mandates compliance "in accordance with the detailed instructions and procedures described in Embraer Service Bulletin (SB) 145-28-0023 Rev. 04 or SB145LEG-28-0018 Rev. 01, or further revisions approved by the Brazilian Agência Nacional de Aviação Civil (ANAC)" (Requirement). This delegates the technical method to the manufacturer’s SBs but conditions acceptability on ANAC approval of any further SB revisions. The AD also cross-refers to an ANAC AD (Note 2), indicating coordination between national regulators.

3. Time/usage-based compliance window. The directive sets a dual trigger for compliance: "within the next 5,000 hours time in service or 4 calendar years, whichever occurs first, after 28 June 2006 (the effective date of ANAC AD 2006-06-02)" (Compliance). The AD thus combines utilisation-based (hours) and chronological (years) limits, counted from a specified anchor date rather than from the AD's own effective date.

Other technical points: applicability is stated as "EMB-145( ) model aircraft" (Applicability), and the AD contains a short caveat "Unless already accomplished" (Requirement). Note 1 expressly limits the "145LEG" service bulletin series to Legacy executive jets, which identifies the need for model-specific SB selection. The AD is presented as an operational airworthiness corrective measure, not as a one-off advisory: it "requires the replacement" (Background/Requirement) and becomes an effective regulatory instrument from 23 June 2008 (Compliance). The CASA delegate signature indicates the issuing authority (signature block).

The primary parties directly affected by the AD are operators and owners of Embraer EMB-145 series aircraft described in the document's Applicability line, which reads "EMB-145( ) model aircraft" (Applicability). The AD’s phrasing "Unless already accomplished" (Requirement) indicates that any aircraft on which the conduit-to-hose replacement has already been performed in line with the required parts and instructions are outside the directive’s mandatory scope for further action.

Maintenance organisations, engineers and technicians performing the replacement are affected insofar as the AD prescribes the procedures and part numbers to be used. The AD specifies that the replacement must follow details in Embraer Service Bulletin 145-28-0023 Rev. 04 or SB145LEG-28-0018 Rev. 01, or subsequent revisions approved by ANAC (Requirement). Therefore, maintenance providers must source and follow the relevant SB revision and ensure conformity with ANAC-approved revisions if later versions are used.

Regulatory authorities are also implicated. The AD explicitly cross-references ANAC (the Brazilian civil aviation regulator), both by requiring ANAC approval for any further SB revisions and by referring to ANAC AD 2006-06-02 (Notes, Requirement). CASA, the Australian Civil Aviation Safety Authority, is the issuer in this document , evidenced by the signature block: "James Coyne, Delegate of the Civil Aviation Safety Authority" dated 16 June 2008. CASA is the decision-maker for this AD’s application within Australian jurisdiction. The interplay shows a chain of decision rights: Embraer issues SBs; ANAC approves SB revisions; CASA enacts the AD for domestic regulatory effect.

Suppliers of the specific replacement parts identified (P/N AE717816-03, AE717816-04, AE717816-05) are materially affected because operators must procure those parts "as applicable" (Requirement). The AD does not specify logistics or supply arrangements, but identifying P/Ns places a procurement obligation on operators/maintenance organisations.

Finally, indirectly affected parties include insurers, auditors and continuing airworthiness managers who must ensure the AD is tracked and complied with within the specified "5,000 hours time in service or 4 calendar years" window measured from 28 June 2006 (Compliance). The document does not list penalties, deferral mechanisms, or temporary operational restrictions in the text provided; therefore affected parties must rely on the AD requirement and compliance timeline as printed.

Key duties are set out in plain terms in the AD text. The principal duty imposed on operators/owners is to ensure that, "unless already accomplished," the metallic tubes enclosing the vent and pilot valve electrical wires in both left and right wing fuel tanks are replaced with specified non-conductive Teflon hoses, P/N AE717816-03, AE717816-04 or AE717816-05 as applicable (Requirement). The operator must perform the replacement "in accordance with the detailed instructions and procedures described in Embraer Service Bulletin (SB) 145-28-0023 Rev. 04 or SB145LEG-28-0018 Rev. 01, or further revisions approved by the Brazilian Agência Nacional de Aviação Civil (ANAC)" (Requirement). That language imposes a duty not merely to change parts but to do the work in conformity with the referenced SB instructions, or any later SB revisions provided those revisions are ANAC-approved.

The AD specifies the compliance window as a duty on the operator to complete the work "within the next 5,000 hours time in service or 4 calendar years, whichever occurs first, after 28 June 2006 (the effective date of ANAC AD 2006-06-02)" (Compliance). That is a hard scheduling parameter imposed by the AD itself. The AD does not, in the text supplied, provide for alternative means of compliance (AMOC), an extension mechanism, or an interim operational limitation; it also does not state whether the aircraft are prohibited from operation beyond the compliance interval until the work is done. The AD’s own wording "Unless already accomplished" creates a right (or relief) for aircraft that have already had the replacement performed prior to the AD becoming effective.

The AD grants a conditional delegation of technical acceptance to ANAC: any further revisions of the specified Embraer SBs are only acceptable for compliance if approved by ANAC (Requirement). That creates a procedural right for operators to rely on later SB revisions once they have the necessary regulator endorsement.

Rights implicit in the AD text are limited. The document does not articulate a review, appeal, or objection procedure within the AD itself; it simply records the directive and the effective date. The only explicit procedural control over variation of the technical method is the ANAC approval requirement for SB revisions. CASA's delegate signature indicates the issuing authority within Australia, but the AD does not include specific administrative appeal rights or compliance-crediting processes in the text supplied.

Finally, the technical notes narrow duties by model: Note 1 clarifies that "The '145LEG' series of Embraer Service Bulletins only applies to Legacy executive jets" so operators must choose the correct SB series depending on whether the aircraft is a Legacy executive variant (Notes). Note 2 cross-references ANAC AD 2006-06-02 (Notes). The AD imposes duties on operators to identify the aircraft variant, source the correct SB, procure the correct P/N Teflon hoses "as applicable," and complete the replacement within the prescribed hours/years interval from 28 June 2006.

The AD text supplied does not set out express penalties, monetary fines, or administrative sanctions within its own wording. It records an issuing authority and effective date and prescribes mandatory maintenance action, but it does not include a catalogue of enforcement responses or procedural steps for non‑compliance in the document provided.

What the AD does provide that is relevant to enforcement is (i) the named issuing authority and signature block, and (ii) the mandatory nature of the technical requirement and compliance window. The AD bears the signature block "James Coyne, Delegate of the Civil Aviation Safety Authority" dated 16 June 2008, and states that it "becomes effective on 23 June 2008" (signature block, Compliance). That establishes CASA as the issuer of this AD in the Australian context and provides the formal imposition of the requirement from the stated effective date.

Because the AD prescribes a mandatory corrective action ("This Directive requires the replacement" , Background/Requirement) and specifies a compliance deadline ("within the next 5,000 hours time in service or 4 calendar years, whichever occurs first, after 28 June 2006" , Compliance), the AD creates an enforceable regulatory obligation through its issuance. However, the supplied text contains no operative section spelling out CASA’s enforcement tools, penalties for failure to comply, or administrative processes (such as notices of non-compliance, grounding orders, or steps for seeking relief or extensions). The AD also does not set out whether compliance must be recorded in specific logbooks, how CASA is to be notified, or what evidence constitutes acceptable proof of compliance.

The document does indicate a supervisory relationship with ANAC for acceptance of SB revisions: "or further revisions approved by the Brazilian Agência Nacional de Aviação Civil (ANAC)" (Requirement). This inter-regulatory approval mechanism may affect enforcement in practice because an operator relying on a later SB revision must ensure it has ANAC approval for that revision; absence of such approval could lead to a technical non-compliance with the AD.

In summary, the AD imposes a clear mandatory technical obligation and a fixed compliance window and identifies CASA as the issuing authority, but it does not itself list penalties or an enforcement regime in the supplied text. Parties seeking to understand enforcement consequences or to pursue relief (such as extensions or alternative compliance methods) will need to consult CASA’s broader administrative framework for AD enforcement or any accompanying regulatory guidance, neither of which is included in the document provided.

The AD explicitly interacts with at least one foreign regulator’s directive and with Embraer’s technical publications. Note 2 refers to "ANAC AD 2006-06-02" and the Requirement ties acceptability of further service bulletin revisions to approval by ANAC: "or further revisions approved by the Brazilian Agência Nacional de Aviação Civil (ANAC)" (Requirement, Notes). Thus the AD, as published by CASA, references and relies on ANAC’s prior action and approvals for the underlying safety concern and the technical path for compliance.

Functionally, this means that the AD’s technical acceptability is conditioned on alignment with ANAC-approved service documentation. Operators wishing to use any later Embraer SB revision as the means of compliance must secure ANAC approval of that revision; the AD makes ANAC approval a gating requirement. The AD also anchors its compliance timeline to the effective date of an ANAC AD: the compliance window is "after 28 June 2006 (the effective date of ANAC AD 2006-06-02)" (Compliance). That demonstrates a direct temporal and procedural link to the ANAC instrument.

The AD also incorporates manufacturer service bulletins by reference (SB 145-28-0023 Rev. 04 and SB145LEG-28-0018 Rev. 01). Implementing the AD therefore requires following Embraer’s technical material. The AD’s instruction to perform the work "in accordance with the detailed instructions and procedures described in Embraer Service Bulletin" (Requirement) embeds manufacturer guidance within the regulatory duty.

The document does not purport to amend, supersede or nullify other domestic regulations within its text; it is presented as an operative AD for the specified aircraft. The supplied text lacks any express statement of interaction with domestic aviation legislation, enforcement statutes, or administrative procedures beyond the CASA signature block. It likewise contains no express transitional provisions that would allocate compliance responsibility across jurisdictions.

To summarise interactions expressly stated in the AD text: (1) the AD is coordinated with and temporally based upon ANAC AD 2006-06-02, (2) the AD mandates compliance via specific Embraer Service Bulletins, and (3) any later SB revisions are acceptable only with ANAC approval. The AD does not, in the text provided, articulate how conflicts between regulatory instruments would be resolved or how the AD interfaces procedurally with CASA’s own enforcement or certification statutes; such interaction would need to be inferred from CASA’s broader regulatory framework which is not included in this document.

The AD cites specific revisions of manufacturer Service Bulletins and refers to an earlier ANAC AD, but the document itself does not set out a multi-stage amendment record for the AD text in this extract. The elements of revision history that appear within the AD are:

• The Embraer Service Bulletin records: SB 145-28-0023 Rev. 04 and SB145LEG-28-0018 Rev. 01 are the specific SB revisions referenced as the instructions required for compliance (Requirement). Referencing precise SB revision numbers anchors the AD to particular technical instructions.

• The AD references ANAC AD 2006-06-02 as the antecedent ANAC measure and uses its effective date (28 June 2006) as the compliance window anchor (Compliance, Notes). This ties the AD to an earlier regulatory action by ANAC, which the AD implies was the original findings’ effective date.

• The AD allows for "further revisions approved by the Brazilian Agência Nacional de Aviação Civil (ANAC)" to be used as means of compliance (Requirement). That language creates a rolling path for amendments to the manufacturer instruction set to be brought into conformity with the AD, but only when ANAC approves them.

The AD itself became effective on 23 June 2008 (Compliance). It was signed by James Coyne, Delegate of the Civil Aviation Safety Authority, on 16 June 2008 (signature block). The document contains no explicit textual record of prior versions of this Australian AD, amendment dates to the AD text itself, or later amendments to the AD; the only items of revision history recorded are the referenced SB revisions and the link to ANAC AD 2006-06-02.

Any substantive amendment to the AD after 23 June 2008 would typically be recorded in a formal amending instrument or revised AD text. Such amendments are not present in the provided material. The AD’s allowance for later SB revisions to be ANAC-approved provides a procedural route for the technical instructions to be updated without necessarily amending the AD language, provided ANAC endorses those service bulletin revisions. The AD, however, does not itself record a sequence of amendments beyond the embedding of SB revision numbers and the ANAC cross-reference.

The AD text supplied contains no information about litigation, legal challenges, judicial review, or administrative appeals relating to AD/EMB-145/2. There are no case names, citations, or references to litigation in the document. The only legal-authority pointer in the text is the issuing signature block identifying the Civil Aviation Safety Authority’s delegate as the signatory and the cross-reference to ANAC AD 2006-06-02.

Therefore, based solely on the supplied instrument, there is no recorded litigation history to report. The AD does not, within this extract, describe any disputes, appeals, or adjudications arising from its issuance or application. If a reader requires information about whether this AD has been the subject of litigation, judicial review, or administrative challenges, they will need to consult external case databases, CASA administrative records or court records; none of that material is included or referenced in the AD text provided.

Several concrete points in the AD text merit careful attention because they can generate operational or compliance traps if overlooked.

1. Applicability wording is terse and potentially ambiguous. The Applicability line reads "EMB-145( ) model aircraft." That parenthetical formatting may confuse identification of which specific subvariants of the EMB-145 family are intended. Operators must not assume universal applicability or exclusion; instead, they must confirm applicability against their aircraft type designation and the manufacturer SBs. The AD’s own acceptance route (SB vs SB145LEG) recognises variant differences (Notes, Requirement).

2. Compliance deadline anchors to an ANAC effective date, not the AD’s Australian effective date. The compliance window is stated as "within the next 5,000 hours time in service or 4 calendar years, whichever occurs first, after 28 June 2006 (the effective date of ANAC AD 2006-06-02)" even though the AD itself "becomes effective on 23 June 2008" (Compliance). That means the counting period for the compliance window starts from 28 June 2006, potentially shortening the remaining time available to comply for many operators by the time CASA’s AD became effective in June 2008. Operators must ensure they calculate the window from the ANAC date, not the CASA effective date.

3. "Unless already accomplished" is crucial. The Requirement begins with "Unless already accomplished, replace..." That creates a negative obligation exempting aircraft for which the work was already performed. Operators who believe they have already completed equivalent work must ensure their work precisely matches the AD’s required P/Ns and SB procedures or is demonstrably equivalent, because the AD does not itself state the criteria for recognizing prior accomplishment beyond the language "Unless already accomplished" (Requirement). Documentation proving prior compliance is therefore essential.

4. Parts must be the specified P/Ns "as applicable". The AD specifies P/N AE717816-03, AE717816-04 or AE717816-05 "as applicable" (Requirement). Operators must ensure correct part selection for left/right tanks and for particular airframe variants; mis-matching P/Ns could be a source of non‑compliance.

5. Reliance on ANAC approval for later SB revisions. The AD allows later SB revisions only if they are "approved by the Brazilian Agência Nacional de Aviação Civil (ANAC)" (Requirement). Operators cannot rely on a later Embraer SB revision alone; they must check ANAC approval. That approval requirement may create delays if an operator wishes to use an in‑progress or newly issued SB revision before ANAC has processed an approval.

6. No explicit operational restriction set out in the AD. The AD does not state whether aircraft are permitted to operate beyond the compliance window pending the replacement. Absence of such direction in the AD text does not mean unrestricted operation is permitted in practice; however, the document itself provides no interim operational limitation language. Operators should be cautious and seek clarification where operational status is a concern.

7. The AD is silent on alternative means of compliance (AMOC), record-keeping format, or notice procedures to CASA. The document requires specific actions but does not set out documentary evidence or submission steps. That omission can be a procedural pitfall if operators assume particular reporting pathways that the AD does not mandate.

8. The AD ties its technical path to Embraer SBs; if an operator has performed functionally equivalent modifications not following those SBs, the AD does not expressly accept them unless they fit within "already accomplished" scope or receive regulator approval. Proof of equivalence will be expected, but the AD does not state the criteria.

Operators and maintenance organisations should manage these concrete "gotchas" by carefully reviewing aircraft variant applicability, documenting prior work, confirming part numbers, calculating the compliance interval from 28 June 2006, checking for ANAC approvals of any SB revisions relied upon, and seeking formal clarification from CASA or ANAC where ambiguity affects airworthiness or operations.

The AD delineates a clear, three-part compliance pathway: confirm applicability, follow the specified SB and parts, and meet the timetable anchored to 28 June 2006.

1. Confirm applicability. Verify whether the aircraft in your fleet is within the AD’s scope: the Applicability line states "EMB-145( ) model aircraft." Given this terse phrasing, confirm your specific EMB-145 subvariant and whether it is covered, taking into account the AD’s Note that the SB145LEG series "only applies to Legacy executive jets" (Notes). If the aircraft is a Legacy executive model, plan to use SB145LEG-28-0018 Rev. 01 (or ANAC-approved later revisions) as the procedural document; otherwise plan to use SB 145-28-0023 Rev. 04 (Requirement, Notes).

2. Determine whether the work has "already [been] accomplished." The Requirement begins "Unless already accomplished, replace..." If the replacement of metallic conduits with non-conductive hoses has already been performed on a given aircraft, gather and file the documentary evidence that the work was done to the required standard, using the specified P/Ns and following the SB procedures, or evidence of equivalence if performed before the AD. The AD does not itself list how compliance proof should be lodged with CASA, but accurate maintenance records should be retained.

3. Follow the service bulletin instructions. The AD requires the replacement "in accordance with the detailed instructions and procedures described in Embraer Service Bulletin (SB) 145-28-0023 Rev. 04 or SB145LEG-28-0018 Rev. 01" (Requirement). Obtain the referenced SB for the correct revision (Rev. 04 for the general SB, Rev. 01 for the Legacy SB). If a later Embraer SB revision is to be used, confirm that it has been approved by ANAC; the AD explicitly conditions acceptability on ANAC approval ("or further revisions approved by the Brazilian Agência Nacional de Aviação Civil (ANAC)"). Use the SB to identify exact tasks, tooling, special instructions, and any post‑work checks.

4. Procure the specified parts. The AD lists acceptable replacement part numbers: AE717816-03, AE717816-04 or AE717816-05 "as applicable" (Requirement). Obtain the correct P/Ns for the aircraft and tank side as required by the SB. The AD does not provide alternative part options.

5. Schedule and accomplish work within the compliance window. Complete the replacement "within the next 5,000 hours time in service or 4 calendar years, whichever occurs first, after 28 June 2006 (the effective date of ANAC AD 2006-06-02)" (Compliance). Calculate the aircraft's hours-in-service since 28 June 2006 to determine the urgent deadline for action. Do not compute the interval from the AD’s Australian effective date (23 June 2008); the AD explicitly uses the ANAC effective date as the start point.

6. Document and retain evidence. While the AD text supplied does not describe the format for evidence submission, compliance will require contemporaneous maintenance entries showing the replacement, referenced SB revision, parts installed (P/Ns), sign-off by authorised personnel, and dates/hours-in-service at the time of work. Maintain these records in your continuing airworthiness documentation.

7. Seek regulator confirmation where needed. If there is ambiguity,variant applicability, proof of prior accomplishment, use of later SB revisions not yet ANAC-approved, or operational questions about flying beyond the compliance deadline,contact the relevant regulatory authority. For use of later SB revisions, confirm ANAC approval; for operational or enforcement questions within Australia, CASA is the issuing authority (signature block).

8. For Legacy executive jets use SB145LEG. Note 1 specifies "The '145LEG' series of Embraer Service Bulletins only applies to Legacy executive jets." If your aircraft is a Legacy executive jet, comply specifically with SB145LEG-28-0018 Rev. 01 or subsequent ANAC-approved revisions as the technical method.

9. Cross-reference ANAC AD 2006-06-02. Note 2 indicates that ANAC AD 2006-06-02 is relevant; consult that ANAC AD for additional context, dates, or technical background that the Embraer SBs and CASA AD reference.

By following these steps,confirm applicability, verify prior accomplishment, use the correct SB and P/Ns, complete the work within the stated hours/years window measured from 28 June 2006, document appropriately and confirm any ANAC approvals,operators will align with the AD’s required path as set out in the document. The AD itself does not specify submission or notification mechanics to CASA; operators should use established CASA reporting channels for AD compliance evidence if such channels are required under CASA’s broader continuing airworthiness rules.