AD/ERJ-170/15 - Pressure Equalisation Valve

The instrument rests on a small set of concrete concepts and technical points stated in the AD text:

• Applicability by serial number. The AD applies only to the Embraer ERJ-170 aircraft with S/Ns explicitly listed: 17000002, 17000004-17000013, and 17000015-17000154 inclusive. Those ranges are explicit and exclude adjacent serial numbers not listed (for example S/N 17000003 and S/N 17000014 are not in the list). The AD’s applicability box is the foundational scope limiter for obligations.

• Component identification. The part at issue is the pressure equalisation valve identified by P/N 120-48865-003. The AD requires verification of presence or installation of that specific P/N; it does not authorise substitute parts in the text.

• Two-step compliance architecture. The AD is structured as a two-step requirement: first, perform a GVI to determine whether the valve(s) are installed; second, if either valve is missing, install the valve(s) in accordance with a specified Embraer Service Bulletin. The two-step structure creates a conditional chain: the installation duty only arises on the factual finding of a missing valve.

• Inspection standard defined. The AD includes a detailed definition of the general visual inspection (GVI). The AD text states: “A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity. This level of inspection is made from within touching distance, unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight or drop-light, and may require removal or opening of access panels or doors. Stands, ladders or platforms may be required to gain proximity to the area being checked.” That definition sets the permitted inspection techniques and the expectation that access may require removal of panels or use of mirrors and lighting.

• Reliance on manufacturer service bulletin and foreign regulator approval. The AD mandates installation “in accordance with Embraer Service Bulletin No. 170-21-0032 original issue, or later revision approved by the ANAC.” That creates two channels of technical authority: the manufacturer’s SB for the means of compliance, and ANAC as the approving authority for any later SB revision.

• Temporal compliance. The AD establishes compliance times in flight hours tied to the AD’s effective date (effective date 8 May 2008); two discrete time horizons are stated: within 500 FH and within 700 FH after that date (the compliance box lists these as items 1 and 2).

• Safety rationale. The AD includes a background statement: the absence of the valve “affect[s] the effectiveness of the fire detection, containment and suppression system.” That is the stated safety rationale that triggers the inspection and installation requirements.

These concepts determine the operational mechanics: which aircraft, what to inspect, how to inspect, what to do if the valve is missing, which technical documentation governs installation, and the time within which to act.

The immediate and required-actor set under the AD is narrow and technically specific:

• Aircraft operators and owners of the named Embraer ERJ-170 airframes. The AD’s applicability section lists specific serial numbers. Those owners/operators must ensure the inspection (GVI) is performed within the stated compliance period and must procure and install the P/N 120-48865-003 valve where missing. The obligation is expressed in terms of the aircraft to which the AD applies, so responsibility attaches to the responsible operator or owner for each relevant airframe.

• Maintenance organisations and maintenance personnel. The AD requires a GVI as defined in the text and, where necessary, installation “in accordance with Embraer Service Bulletin No. 170-21-0032.” Those tasks will fall to certificated maintenance organisations or persons authorised to perform inspections and installations on the relevant airframes. The GVI definition permits opening access panels and other basic maintenance access activities, and the installation requires following the manufacturer’s service bulletin, so maintenance providers must have access to that SB and the approvals (ANAC) if using a later revision.

• Parts suppliers and logistics. Operators who must install missing valves will need to source the specific part number (P/N 120-48865-003). Supply chain actors that stock or distribute that part are indirectly affected by demand created by the AD.

• Regulatory authorities. The Civil Aviation Safety Authority (CASA) issued the AD (signed by the delegate David Punshon) and sets the AD as effective on 8 May 2008. The AD also references ANAC (Brazil) both as the original authority for a related AD and as the body whose approval is required for later revisions of the Embraer service bulletin. The ANAC reference gives a role to a foreign regulator in approving later technical means of compliance.

• Operators of non-listed ERJ-170 serial numbers and other types. Those operators are not directly bound by this AD as written. The narrow S/N list means aircraft adjacent in serial sequence but not listed are outside the AD’s commanded scope.

• Cargo/passenger stakeholders. The AD identifies cargo-compartment blow-out panels and their pressure equalisation valves; freight operators that use affected aircraft are indirectly affected insofar as required maintenance may impose scheduling or minor capability constraints while the AD’s work is done.

The AD does not address alternate compliance paths beyond the SB/ANAC route, does not list exemptions, and does not set out an appeals mechanism in the document itself. The obligations attach to the aircraft listed; maintenance organisations executing the work act on behalf of the operator or owner.

Duties imposed by the AD are explicitly set out in the “Requirement” and “Compliance” boxes. Rights and limits are implied by the AD’s structure and by the conditional nature of the duty.

Duties (explicit)

• Perform the GVI. The primary duty is to “Perform a general visual inspection (GVI) on the left-hand bulkhead blow-out panel on both the forward and aft cargo compartments to check whether the pressure equalization valves part number (P/N) 120-48865-003 are installed.” The GVI is defined in detail in the AD text and is an affirmative, time-bound duty.

• Install missing valves per Embraer SB. If the inspection shows that either valve is missing in either blow-out panel, the AD requires the operator to “install the missing valves P/N 120-48865-003 in accordance with Embraer Service Bulletin No. 170-21-0032 original issue, or later revision approved by the ANAC.” The installation obligation is conditional upon the factual result of the inspection.

• Observe the compliance times. The AD’s compliance box sets two flight-hour-based time limits: item 1 within the next 500 FH after the effective date, and item 2 within the next 700 FH after the effective date. The AD text links those time limits to the requirements in the requirement block; the structure implies the GVI must be done within one of those horizons and any necessary installations within the other. The effective date is 8 May 2008.

Rights and limits (explicit or implied)

• No additional action if valve(s) present. The AD explicitly states “If both pressure equalization valves are installed in their respective blow-out panels, no additional action is required by this AD.” That is an unqualified limitation on the duty; a currently conforming installation ends the AD’s obligations for that airframe (subject to later ADs or other rules).

• Use of later service bulletin revisions only with ANAC approval. The AD permits the use of a later revision of Embraer SB No. 170-21-0032 only if that later revision has been approved by ANAC. That grants operators and maintenance organisations a constrained choice: they may follow the original SB or use a revised SB only once ANAC approves that revision.

• Inspection method as prescribed. The AD prescribes the inspection standard (GVI) and what it entails; the inspection must be performed to that standard rather than an ad hoc or partial check.

Matters not covered in the document

• The AD does not state how compliance is to be documented, who must sign off maintenance records, or what action CASA will take for non-compliance. It does not set out a process for requesting an alternative method of compliance (AMOC) or exemptions within the text provided. Those omissions mean any administration of compliance, record-keeping, or alternative approvals must be sought or determined outside the AD text.

• The AD does not state operational relief (for example temporary operating permission) nor does it explicitly require grounding of aircraft pending compliance. The duty is framed in inspection/installation terms, with flight-hour deadlines, rather than immediate grounding.

In short, the AD creates a directed maintenance inspection and conditional installation duty governed by the specified SB and the ANAC approval process for SB revisions. Operators have the right to do nothing further where both valves are present, and a constrained ability to adopt later SB revisions only upon ANAC approval.

The AD text itself does not specify civil or criminal penalties, administrative sanctions, or enforcement procedures. The document records the effective date (8 May 2008) and bears the signature of David Punshon, a delegate of the Civil Aviation Safety Authority (dated 6 March 2008), but it contains no express provisions setting fines, suspensions, or enforcement steps for failure to comply.

What the AD does provide that is relevant to enforcement in practice (as expressed in the source):

• Mandatory compliance content. The AD states inspection and installation duties and specifies compliance times. That gives a regulator a clear factual standard against which to measure compliance: whether the GVI was completed as defined, whether P/N 120-48865-003 is installed where required, whether installations conform to Embraer SB No. 170-21-0032 or an ANAC-approved later revision, and whether the actions were completed within the stated flight-hour limits from the effective date.

• Inter-reference to other regulatory instruments. The AD references AGÊNCIA NACIONAL DE AVIAÇÃO CIVIL - BRAZIL AD 2007-11-01 (dated 12 December 2007). That cross-reference suggests a common safety concern between regulators and potential reinforcement of the obligation across jurisdictions, but the AD does not itself state whether ANAC or CASA will coordinate enforcement measures.

What the AD does not state

• No enforcement mechanism or sanctions are described. The AD does not set out how CASA will enforce compliance, which administrative processes will be used, or the consequences of failing to comply by the specified FH deadlines.

• No statement on rectification periods or reprieve. The AD presents flight-hour thresholds but does not describe whether an aircraft may be operated pending completion (other than the flight-hour deadlines), nor whether regulators may grant extensions or approve alternative methods of compliance; the only alternative explicitly allowed is use of a later SB revision if ANAC approves it.

Practical inference from the text (limited to the source)

• The AD defines obligations and a compliance timetable that are measurable. Absent specified penalties, enforcement would logically rely on regulator monitoring and the normal safety oversight mechanisms that a regulator exercises, but the AD does not detail those mechanisms. The operator’s exposure to any sanction or administrative action is not described in the document itself; any enforcement action would be founded on broader regulatory powers external to the text provided.

Because the document contains no sanctioning language, parties seeking clarity on enforcement procedures, potential penalties for non-compliance, or processes for alternatives or relief must consult the issuing regulator’s broader enforcement and administrative frameworks outside this AD text.

The AD text itself makes limited but explicit connections to other regulatory instruments and to manufacturer technical material:

• Embraer Service Bulletin No. 170-21-0032 governs the approved method for installing the pressure equalisation valve. The AD requires installation “in accordance with Embraer Service Bulletin No. 170-21-0032 original issue, or later revision approved by the ANAC.” That links the AD’s technical compliance requirement to manufacturer documentation and creates an operational dependency: compliance requires obtaining and following the SB or waiting for ANAC approval of any later SB revision before using it as the installation method.

• Reference to ANAC AD 2007-11-01. The AD notes “AGÊNCIA NACIONAL DE AVIAÇÃO CIVIL - BRAZIL AD 2007-11-01 dated 12 December 2007 refers.” That cross-reference links the CASA AD to a prior ANAC action addressing essentially the same technical issue. The AD therefore operates in a transnational regulatory space where CASA’s measure mirrors or responds to a foreign regulator’s directive. The AD text conditions the use of later SB revisions on ANAC approval, further entrenching that linkage.

• Sourcing and approvals. The AD requires ANAC approval for later SB revisions. That creates a legal interaction in which a foreign regulator’s approval is a necessary precondition for Australian operators to rely on amended manufacturer guidance when complying with this CASA AD.

What the AD does not do (within the text provided)

• The AD does not purport to amend other statutes or regulations, nor does it purport to modify the terms of operator certificates, maintenance approvals, or broader type-certification documents. It does not list or quote any Australian statutory provision authorising the AD; the document is the directive itself.

• The AD does not explicitly address conflicts or precedence between CASA’s AD and ANAC’s AD beyond requiring ANAC approval for later SB revisions.

Operational interaction points to note (derived from the AD’s cross-references)

• Where an operator wishes to use a later revision of the Embraer SB as the basis for installation, the operator must check whether ANAC has approved that revision. The AD makes ANAC approval the gating condition; CASA’s AD does not by itself validate an unapproved revision for compliance.

• The AD’s inclusion of the ANAC AD reference indicates regulators may coordinate, or at least align, on safety corrective actions. For operators whose maintenance programmes or manuals cross jurisdictions, the AD creates a need to track both CASA and ANAC instruments and approvals relevant to the same technical fix.

In sum, the AD interacts with manufacturer technical instructions and a named foreign regulator’s AD. It does not itself outline broader statutory interplay, penalties under other laws, or procedural avenues for alternative compliance; those matters must be resolved through the broader regulatory framework outside the AD text.

The text provided includes a single Airworthiness Directive as issued and does not contain any later amendments, revocations, or consolidations. What the document records that is relevant to amendment history:

• AD identifier and date. The AD is designated AD/ERJ-170/15 and dated 5/2008; it is presented with an effective date of 8 May 2008 and signed by David Punshon, Delegate of the Civil Aviation Safety Authority, on 6 March 2008. Those entries establish the initial issuance and effective date in the record.

• Service bulletin revision gating. The AD permits compliance with “Embarrer Service Bulletin No. 170-21-0032 original issue, or later revision approved by the ANAC.” That language contemplates future revisions to the service bulletin. However, the AD text itself neither incorporates any later revision nor records approval of any later revision by ANAC; it simply sets out the condition under which a later revision would become acceptable for the installation requirement.

• References to prior foreign AD. The AD notes that ANAC’s AD 2007-11-01 dated 12 December 2007 “refers.” That identifies a prior related action by ANAC but is not an amendment to the CASA AD.

No textual amendments, superseding AD numbers, revocations, or subsequent versions are present in the supplied text. The document therefore represents a single issued AD with the effective date specified; any subsequent amendments, revocations, or follow-on ADs are not included in the source and cannot be asserted from it.

Operators needing to be certain of current obligations will need to check the regulator’s AD register or other updated sources outside this document to determine whether later amendments or related ADs have been issued.

The provided AD text contains no references to litigation, court proceedings, appeals, or judicial decisions. There is no mention of disputes, legal challenges, or administrative appeals recorded in the document.

What is in the document that bears on litigation or legal contestability (but does not itself create litigation history):

• It is an administrative directive signed by a named CASA delegate, which is the typical form for an AD as a regulatory instrument. The presence of a named delegate and an effective date indicates an administrative act has been taken.

• The AD refers to a foreign regulator’s AD and to manufacturer service bulletin requirements; those cross-references are administrative and technical, not adjudicative. There is no stated dispute resolution procedure, no notice of rights of appeal, and no record of contested facts or adjudicated findings.

Because the supplied text contains no litigation-related content, there is no litigation history to summarise from the source. Any litigation that may later arise from or relate to this AD is not reflected here and cannot be inferred from the document. Parties looking for cases or administrative proceedings involving this AD must consult external legal databases or regulator records, which are not part of the supplied material.

The AD text contains a number of precise technical and drafting features that can produce pitfalls for operators, maintenance organisations, and procurement teams. The following items are grounded in the exact wording and structure of the AD:

• Narrow serial-number applicability. The AD applies only to S/N 17000002, S/Ns 17000004-17000013, and S/Ns 17000015-17000154 inclusive. The explicit listing means some nearby serial numbers are not covered (for example 17000003 and 17000014 are not listed). Operators must check each airframe’s serial number carefully; assuming all ERJ-170s are covered would be an error.

• Exact part number required. The AD identifies P/N 120-48865-003 as the required pressure equalisation valve. The AD does not authorise a different part number; maintenance and procurement must match that P/N or follow the SB’s instructions where it specifies part ordering information.

• Conditional nature of installation duty. The installation obligation arises only if the GVI shows either valve missing. If both valves are present “no additional action is required by this AD.” Misreading the conditional phrasing could lead to unnecessary installations or to inaction where action is truly required.

• GVI may require removing access panels. The GVI definition expressly allows “removal or opening of access panels or doors.” A superficial or line-of-sight check that does not open panels where necessary may fail to meet the inspection standard. The definition also permits use of mirrors, ladders and lighting; technicians should plan access accordingly.

• Two compliance times; potential ambiguity in mapping duties to times. The compliance box lists two items with two flight-hour limits , 500 FH and 700 FH , but does not label them in the text beyond “1.” and “2.” The logical reading is that item 1 (the GVI) is to be done “within the next 500 FH” and item 2 (installation if missing) “within the next 700 FH.” However, the AD document structure is the only authority for that mapping. Operators should ensure both the inspection and any subsequent installation are completed within the overall timeframes and seek regulator clarification if necessary.

• Use of later SB revision requires ANAC approval. The installation must be “in accordance with Embraer Service Bulletin No. 170-21-0032 original issue, or later revision approved by the ANAC.” Practically, maintenance providers cannot simply adopt a later Embraer SB revision without checking ANAC’s approval status. This is a process constraint that may delay use of revised technical instructions unless ANAC has acted.

• Cross-jurisdiction dependence. The AD explicitly refers to an ANAC AD and requires ANAC approval of later SB revisions. That creates a dependency on a foreign regulator’s approval process for the use of later manufacturer revisions as a compliance method, which can be a coordination risk if ANAC has not acted or if the approval timeline differs from CASA’s expectations.

• No stated enforcement or documentation requirements in the AD. The AD does not state how compliance should be documented or reported. Operators should not assume regulatory guidance on record-keeping is included in the AD; they may need to consult regulator practice or maintenance standards outside the AD.

• Effective and signature dates differ. The document is signed 6 March 2008 but records the AD as effective on 8 May 2008. Where compliance timing is measured from the effective date, operators must anchor the flight-hour clocks to 8 May 2008, not the signature date.

• The stated safety effect is limited to the left-hand bulkhead blow-out panels. The AD targets the left-hand blow-out panels on forward and aft cargo compartments only. It does not state whether other panels or valves are implicated; treating the AD as a blanket cargo-compartment inspection could lead to unnecessary work.

Awareness of these drafting and technical details reduces the risk of misapplication, missed deadlines, improper parts use, or incorrect reliance on unapproved service bulletin revisions.

The AD prescribes a clear sequence and limits the acceptable technical means of compliance to the items stated. The steps below rest strictly on the AD text and provide a practical route to compliance consistent with the wording and timelines in the document:

1. Establish applicability for each airframe. Confirm whether the aircraft’s serial number appears in the AD’s applicability block: S/N 17000002; S/Ns 17000004 through 17000013 inclusive; and S/Ns 17000015 through 17000154 inclusive. Only aircraft with those serial numbers are subject to the AD’s mandatory requirements.

2. Calculate compliance windows from the effective date. The AD lists compliance “within the next 500 Flight Hours (FH) after the effective date of this AD, unless previously accomplished,” and “within the next 700 FH after the effective date of this AD.” The effective date given in the AD is 8 May 2008. Use that effective date to compute the FH deadlines for the inspection and installation tasks.

3. Perform the General Visual Inspection (GVI) on the left-hand bulkhead blow-out panels in both forward and aft cargo compartments, within the stated 500 FH window. The AD defines GVI as: “A visual examination of an interior or exterior area, installation or assembly to detect obvious damage, failure or irregularity. This level of inspection is made from within touching distance, unless otherwise specified. A mirror may be necessary to enhance visual access to all exposed surfaces in the inspection area. This level of inspection is made under normally available lighting conditions such as daylight, hangar lighting, flashlight or drop-light, and may require removal or opening of access panels or doors. Stands, ladders or platforms may be required to gain proximity to the area being checked.” Follow that standard: be prepared to open panels, use mirrors, or use stands/lighting to gain the requisite proximity and visibility.

4. Inspect specifically for pressure equalisation valves P/N 120-48865-003. The GVI must ascertain whether those valves are installed in the left-hand bulkhead blow-out panel on both forward and aft cargo compartments. The AD conditions the next step on whether either valve is missing.

5. If both valves are present in their respective locations, note that “no additional action is required by this AD.” This completes compliance for that airframe per the AD text.

6. If either valve is missing, arrange installation of the missing valve(s) in accordance with Embraer Service Bulletin No. 170-21-0032 original issue, or a later revision only if that later revision has been approved by ANAC. The AD makes adherence to the SB the required installation procedure. Do not substitute another method of installation unless ANAC approval is obtained for an alternative SB revision; the AD text does not authorise any other method.

7. Complete any required installations within the timeframe indicated (the compliance box includes a 700 FH horizon). The AD lists two compliance items with 500 FH and 700 FH; the installation task corresponds to the second item in the AD’s requirement block and so is governed by the 700 FH timing. Ensure the installation(s) are done within the stated 700 FH limit after the effective date if the GVI revealed a missing valve.

8. Use authorised maintenance personnel and follow the Embraer SB. Because the installation must follow the manufacturer’s SB, ensure maintenance personnel are familiar with the SB content and that the parts (P/N 120-48865-003) are correct and sourced appropriately. Employ the SB’s detailed steps for installation, torque values, sealing, or any post-installation checks prescribed by Embraer in that SB.

9. Check ANAC approval status before relying on a later SB revision. If the maintenance programme wishes to use a later revision of Embraer SB No. 170-21-0032 to perform installation, confirm that ANAC has approved that later revision, as the AD explicitly conditions the use of later revisions on ANAC’s approval.

10. Record completion of the inspection and any installations in maintenance records as required by the applicable maintenance regulation or organisational procedure. While the AD itself does not specify documentation format, standard aviation practice is to document conformity; ensure entries record the GVI findings, corrective actions, part numbers installed, and references to Embraer SB No. 170-21-0032 (and any ANAC-approved revision relied upon).

11. Monitor for any subsequent ADs or amendments. The provided AD text contains no amendments, but operators should confirm whether any further directives, superseding ADs, or guidance have been issued after the effective date to ensure ongoing compliance.

Following these steps as stated in the AD text will meet the duties the AD imposes: conduct the GVI to the prescribed standard, verify the presence of P/N 120-48865-003 valves in the specified left-hand blow-out panels, and install missing valves using the Embraer SB or an ANAC-approved later revision within the stated flight-hour limits measured from the AD’s effective date.