AD/EMB-120/29 Amdt 4 - Elevator Trim System

The document embeds several core regulatory concepts: applicability, external incorporation, procedural amendment of the AFM, placarding, and staged amendment history.

• Applicability: the AD applies to "All Model EMB-120 aircraft" (Applicability). That single-line applicability is the gate for who must comply.

• Incorporation by reference and external authority: the AD requires action "in accordance with the instructions contained in Brazil ANAC AD2001-06-01 R4 Amdt 39-1193" (Requirement). The CASA instrument therefore implements via incorporation by reference an ANAC directive rather than reproducing the technical content in full. The AD also references Embraer service bulletins and permits later ANAC-approved revisions to those documents to satisfy the AD's note (Note).

• AFM amendment: the AD requires a flight manual amendment to be incorporated into the Aircraft Flight Manual at Revision 67, dated 5 June 2001 (Requirement). The AD includes a procedural detail that once the Flight Manual has been amended to include this revision, the copy of the ANAC AD that ANAC requires to be inserted into the Flight Manual may be removed (Requirement). That creates a two-step compliance path for operators: a temporary insertion of the ANAC AD into the AFM until the AFM itself is updated.

• Placarding: amendment history shows placarding requirements on the cockpit main instrument panel glareshield were imposed by Amendment 1, then text-modified by Amendment 2 (Background). The instrument therefore treats placarding as an interim mitigant prior to more substantive system modification.

• System modification: Amendment 4 "is issued in response to a revision of the related ANAC AD, which requires modification of the elevator trim system" (Background). The current amendment therefore reflects a shift from procedural/operational mitigations (placards and AFM changes) towards a hardware or system modification mandated by ANAC.

• Compliance statement and effective date: the AD states compliance is "as specified in the Requirement document" (Compliance) and becomes effective 27 September 2007 (Compliance). These items set the binding timeline and the normative documents that specify the detailed steps.

Taken together, the AD uses a familiar safety-regulatory pattern: identify affected fleet, adopt an overseas authority's technical directive by reference, mandate a flight manual amendment and interim cockpit placards, and then require or follow a hardware modification once mandated by the certifying authority. The AD's text confines itself to cross-reference and high-level administrative obligations rather than reproducing the technical remedy.

The AD's explicit applicability is "All Model EMB-120 aircraft" (Applicability). That language identifies the affected population narrowly by aircraft type rather than by registration, operator or role. In practical terms the direct operational actors who must implement the AD are the holders of the affected aircraft: owners, operators, maintenance organisations and pilots who rely on the AFM for procedures.

The AD does not name a specific category as financially liable, but the requirement language and customary aviation regulatory practice impose the operative obligations on those responsible for continued airworthiness of the aeroplane. The document requires changes to the Aircraft Flight Manual and references modification and placarding tasks; those actions are performed by maintenance organisations or operators authorised to amend AFMs in accordance with national procedures. The AD further cross-references Brazil ANAC AD2001-06-01 R4 Amdt 39-1193 and Embraer service bulletins (120-25-0262, 120-27-0095, 120-27-0096), which typically specify technical instructions for field maintenance and modification; therefore the technicians and engineers who execute those service bulletins are also implicated.

Pilots are affected in that the AD requires an AFM amendment and, at least historically in prior amendments, placards on the cockpit main instrument panel glareshield (Background). Placards and AFM revisions change pilot procedures and warnings; the AD expressly requires the AFM revision at Revision 67, dated 5 June 2001 (Requirement). Until the AFM is updated, a copy of the ANAC AD is to be inserted in the AFM , a document pilots reference , and eventually may be removed once the AFM is amended (Requirement).

Regulatory authorities are indirectly affected: CASA is the issuing authority here and is implementing ANAC's technical direction domestically by reference. The AD reflects inter-authority reliance: CASA adopts ANAC's remedy for the EMB-120 fleet. Embraer as the design authority is referenced via its service bulletins; those documents and any ANAC-approved revisions are the technical locus for modification work (Note).

The AD does not state which party pays for the required work, nor does it quantify downtime, parts or labour. That absence leaves owners/operators exposed to bearing any direct costs, and to scheduling maintenance to meet the effective date, although the AD itself does not allocate cost responsibility.

Key duties in the AD are narrowly framed but operationally significant.

• Follow ANAC instructions: the principal duty is to "Action in accordance with the instructions contained in Brazil ANAC AD2001-06-01 R4 Amdt 39-1193" (Requirement). That phrase delegates the procedural and technical specifics to the ANAC document. The duty therefore requires operators to obtain and follow that ANAC AD and any referenced, ANAC-approved revisions of Embraer service bulletins.

• AFM amendment: operators must incorporate the flight manual amendment required by the Directive into the Aircraft Flight Manual at Revision 67, dated 5 June 2001 (Requirement). This is an explicit duty affecting documentation and operational procedures.

• Temporary AFM insertion: the AD requires a copy of the ANAC AD to be inserted into the AFM until the AFM has been amended to include the relevant requirements; after amendment, that copy "may be removed" (Requirement). That gives operators an explicit administrative pathway: an interim duty (insert ANAC AD) followed by a one-time action (incorporate the AFM revision) which then terminates the interim duty to carry the AD copy.

• Referenced service bulletins: the AD's Note references Embraer Service Bulletins 120-25-0262, 120-27-0095, and 120-27-0096, original issues or later ANAC-approved revisions (Note). While the AD's operative sentence is to follow ANAC AD2001-06-01 R4, the Note makes clear that the Embraer service bulletins are the technical avenues by which compliance is expected to be effected.

Rights and limitations in the text are limited:

• Removal of the ANAC AD from the AFM is a permissive right, not an obligation, once the AFM incorporates the required revision (Requirement): "the copy of the AD ... may be removed." That is an expressly granted administrative relief.

• The AD does not create explicit exemptions, deferrals, or alternative means of compliance in the text provided. It also does not state an appeal route or specify rights of operators to seek equivalent safety measures. The AD simply cross-references ANAC and the Embraer bulletins as the required path.

• The AD does not itself specify maintenance standards or who may perform the work; those details will be governed by the ANAC AD and service bulletins to which the AD refers, and by domestic licensing and continuing airworthiness rules external to the text provided.

Taken together, the duties are: obtain and follow the ANAC AD and specified Embraer service bulletins, incorporate the AFM Revision 67 amendment, and insert the ANAC AD into the AFM until the AFM is appropriately updated. The single explicitly stated permissive right is removal of the inserted copy after the AFM revision is in place.

The AD text provided does not specify any penalty regime, sanctions, or enforcement mechanisms. The document states compliance is "As specified in the Requirement document" (Compliance) but does not reproduce enforcement provisions from ANAC AD2001-06-01 R4 Amdt 39-1193, nor does it set administrative penalties, certificate actions, or criminal offences in the text presented.

Because the AD operates by cross-reference to ANAC instructions, any enforcement measures that may apply in Australia would rely on the domestic regulatory framework for mandatory ADs and continuing airworthiness obligations, which are not detailed in the provided text. The instrument is signed by a CASA delegate, indicating domestic adoption, but the AD as presented does not itself set out enforcement processes, inspection rights, or oversight steps.

The AD does record an effective date: "This Amendment becomes effective on 27 September 2007" (Compliance). Effective date establishes when the required actions must be completed in accordance with the referenced documents, but no timing, grace period or staged compliance schedule is included in the text supplied beyond that date and the instruction to comply with the Requirement document.

Where enforcement and penalties are material to an operator, they must be sought in the authoritative CASR or related instruments administered by CASA and in the ANAC AD referenced. The CASA AD as supplied here provides the mandatory directive and its technical linkage to ANAC and Embraer documents, but it does not itself stipulate sanctions for non‑compliance within the extract provided.

The AD explicitly interacts with foreign and domestic aviation safety documents and with the AFM as an operational legal document.

• Inter-authority interplay: the AD adopts by reference a Brazilian authority directive: "Action in accordance with the instructions contained in Brazil ANAC AD2001-06-01 R4 Amdt 39-1193" (Requirement). That shows a direct regulatory interaction where CASA enforces an ANAC technical requirement domestically for the EMB-120 fleet. The AD thus creates dependence of Australian continuing airworthiness obligations on a foreign authority's normative technical content.

• Interaction with manufacturer service information: the AD's Note cross-references Embraer Service Bulletins 120-25-0262, 120-27-0095, and 120-27-0096 (Note). Those documents typically contain the technical procedures to implement modifications or inspections. The AD therefore situates those service bulletins as supporting or incorporated documents for compliance, subject to "original issues, or later ANAC approved revisions" (Note). The interaction means that implementation must be aligned to manufacturer instructions as approved by ANAC.

• Interaction with the Aircraft Flight Manual (AFM): the AD requires incorporation of a specific AFM revision (Revision 67, dated 5 June 2001) and prescribes insertion of the ANAC AD into the AFM until the AFM amendment is completed (Requirement). The AFM is a legal operational document; mandating its amendment changes pilot procedures and limitations in a way that interacts with operational safety obligations.

• Administrative procedure: the AD’s instruction that the copy of the ANAC AD may be removed once the AFM includes the revision creates a specific administrative interaction between temporary documentation (inserted AD) and permanent documentation (AFM revision). The AD therefore creates an administrative sequencing obligation.

• Lack of stated interaction with civil penalties or operators' rights: the AD text does not reference other statutes, regulations, or enforcement mechanisms in the material provided. The AD’s legal force will therefore be read in conjunction with domestic aviation statutes and continuing airworthiness rules, which are not reproduced here.

In sum, the AD is a domestic instrument that relies on a foreign technical directive and manufacturer service information to define the substantive requirements and that modifies the AFM, thereby intersecting operational legal documentation. The precise legal consequences beyond these interactions are not specified in the AD extract provided.

The AD text contains an explicit amendment narrative recording four incremental changes and their purposes.

• Original issuance and Amendment 1: the background notes that an initial measure required the installation of placards on the cockpit main instrument panel glareshield "in addition to the current requirements" (Background). The AD does not reproduce the placard text here but records that placards were an early mitigant.

• Amendment 2: this modified the text of the placards on the cockpit main instrument panel glareshield (Background). The AD indicates the placard wording was changed, signalling an evolution in the operational warning communicated to flight crews.

• Amendment 3: this was issued to allow the copy of the Brazilian AD which the AD requires to be inserted into the Flight Manual to be removed from the Flight Manual once the Flight Manual has been amended to include the relevant requirements (Background). That amendment introduced a specific administrative relief and a sequencing convenience for operators, shifting the interim requirement into a temporary step.

• Amendment 4: the AD as presented is Amendment 4. The text says "Amendment 4 is issued in response to a revision of the related ANAC AD, which requires modification of the elevator trim system" (Background). That identifies Amendment 4 as reactive to the ANAC AD being revised to require a hardware or system modification (the AD here does not reproduce the modification steps, but indicates that the ANAC AD revision compels modification).

The AD includes the effective date for the Amendment 4 instrument: "This Amendment becomes effective on 27 September 2007" (Compliance). The AD is signed and dated 17 August 2007 by a CASA delegate (Charles Lenarcic).

The Note identifies cross-reference service bulletins and allows later ANAC-approved revisions to them to be acceptable for compliance: "Embraer Service Bulletins 120-25-0262, 120-27-0095, and 120-27-0096, all original issues, or later ANAC approved revisions, refer" (Note). That mechanism allows the amendment regime to accommodate manufacturer updates subject to ANAC approval.

The amendment history recorded in the AD therefore shows a progression from interim operational mitigations (placards and AFM changes) toward a required modification of the elevator trim system as the certifying authority (ANAC) tightened the technical fix. The AD provides administrative sequencing and cross-reference flexibility to implement those technical changes domestically.

The document provided contains no litigation history. It does not reference any judicial decisions, challenges, litigation outcomes, or administrative appeals related to this AD, its predecessors or to ANAC AD2001-06-01. The text lists only administrative amendments, technical references and the signature of the CASA delegate.

Given the absence of any litigation material in the provided source, there is no record here of court interpretation of the AD, of legal disputes over the scope or effect of the mandated steps, nor of challenges to the underlying ANAC directive within the supplied text. Any analysis of judicial responses, enforcement litigation or precedent would require consultation of court records, administrative appeals and additional regulatory files which are not part of the source supplied.

Practitioners who need to know whether this AD has been the subject of litigation, or whether there are interpretive rulings affecting its implementation or enforcement, must seek those materials outside the document provided. The AD itself is an administrative instrument with an effective date and an explicitly stated technical reference; it does not in the extract cite cases, appeals, or judicial outcomes.

The AD's brevity hides a number of operational and administrative pitfalls that arise from its structure and cross-references.

• Incorporation by reference: the AD requires action "in accordance with the instructions contained in Brazil ANAC AD2001-06-01 R4 Amdt 39-1193" (Requirement). Because the technical content is not reproduced in the text, an operator who fails to obtain the exact ANAC AD and any ANAC-approved revisions of the Embraer service bulletins risks non-compliance. The AD’s Note permits reliance on "original issues, or later ANAC approved revisions" of the Embraer service bulletins; operators must therefore ensure they work with the ANAC-approved revision set, not merely the original manufacturer revision (Note).

• AFM revision specificity: the AD requires incorporation of the AFM amendment at "Revision 67, dated 5 June 2001" (Requirement). That precise revision identifier matters; inserting the wrong AFM revision or an AFM that does not exactly match the stated revision may leave an operator non-compliant. The AD also allows removal of the ANAC AD copy once the AFM is amended to include the revision; without correct record-keeping this administrative relief could be misapplied.

• Placard changes across amendments: Amendment 1 required placards on the cockpit glareshield, and Amendment 2 modified the placard text (Background). Practically, this creates a need to verify which placard text is currently required. Relying on an older placard wording could leave the operator out of step with the then-current requirements. The AD does not paste the placard wording, so implementers must retrieve the text from ANAC ADs or Embraer service documents.

• Timing and effective date: the AD's effective date is 27 September 2007 (Compliance) though the instrument is dated 17 August 2007. Operators must plan to meet the compliance steps by the effective date or follow any timelines specified in the ANAC AD. The AD's text does not recite a compliance window or inspection intervals; those are in the referenced documents.

• Scope of "modification": Amendment 4 is issued "in response to a revision of the related ANAC AD, which requires modification of the elevator trim system" (Background). The AD does not reproduce the modification instructions; implementers must obtain the ANAC AD and the Embraer service bulletins (listed in the Note) to determine whether the modification requires replacement parts, special tools, structural work, or extended grounding. That uncertainty can affect parts provisioning and maintenance scheduling.

• Responsibility and cost: the AD does not allocate costs. The absence of a cost allocation clause means that common operational practice will place the financial burden on the aircraft owner/operator, but the AD does not explicitly say so. This is an administrative “gotcha” for budgeting and contractually shared fleets.

• Administrative sequencing: the AD requires the ANAC AD to be inserted into the AFM until the AFM is amended (Requirement). Operators must ensure that AFM copies in cockpits and in fleet documentation are updated consistently; failing to insert the ANAC AD or failing to update all AFM copies creates inconsistencies during audits or inspections.

• Cross-jurisdictional reliance: because CASA implements a Brazilian AD, operators should verify whether any Australian-specific deviations are required by CASA beyond the ANAC AD’s content. The AD does not specify any CASA-specific departures, but the link to a foreign AD makes it essential to confirm that ANAC-approved revisions are acceptable to CASA for Australian-registered aircraft.

These practical points are implicit in the AD’s structure and cross-references. They highlight the need for careful document control, precise identification of the ANAC and Embraer documents to be used, and prudent operational planning around parts, permissions and AFM administration.

The AD sets a concise compliance pathway by reference; the practical compliance steps that flow from the instrument are as follows, grounded in the AD’s text.

1. Determine applicability: confirm that the aeroplane is an EMB-120 model. The AD applies to "All Model EMB-120 aircraft" (Applicability). If the aircraft is not an EMB-120, the AD is not applicable.

2. Obtain the referenced documents: acquire Brazil ANAC AD2001-06-01 R4 Amdt 39-1193 and the Embraer service bulletins noted (120-25-0262, 120-27-0095, 120-27-0096), ensuring that any later ANAC-approved revisions of those service bulletins are captured, as the AD’s Note permits original issues or later ANAC-approved revisions (Note).

3. Follow the ANAC AD instructions: implement the actions "in accordance with the instructions contained in Brazil ANAC AD2001-06-01 R4 Amdt 39-1193" (Requirement). The CASA AD does not reproduce technical steps; compliance requires strict adherence to the ANAC AD and the Embraer service bulletins authorised by ANAC.

4. Amend the Flight Manual: incorporate the flight manual amendment into the Aircraft Flight Manual at Revision 67, dated 5 June 2001, as required by the Directive (Requirement). That amendment is obligatory and will alter operational procedures.

5. Insert ANAC AD copy into AFM as interim measure: until the AFM has been amended to include Revision 67, insert a copy of ANAC AD2001-06-01 R4 into the AFM as ANAC requires; after the AFM is amended, that inserted copy "may be removed" (Requirement). Keep records of insertion and removal.

6. Install placards where required (if still applicable): prior amendments imposed placards on the cockpit main instrument panel glareshield and altered their text (Background). If the current ANAC AD or Embraer service bulletins continue to require placards, ensure the correct placard wording and location are installed.

7. Implement hardware modification if required: Amendment 4 responds to an ANAC AD revision "which requires modification of the elevator trim system" (Background). If the ANAC AD requires a modification, arrange for maintenance or modifications as specified in the ANAC AD and Embraer service bulletins. Ensure work is performed by appropriately authorised maintenance organisations and that any parts or overhauls conform to the service bulletin and ANAC approvals.

8. Document compliance: maintain records showing when the AFM was amended, when placards were installed or changed, and when any modification work was completed. Record the service bulletin revision used and confirmation that it was ANAC-approved if required by the Note.

9. Verify effective date and any scheduling requirements: the AD becomes effective on 27 September 2007 (Compliance). Confirm that any time-limited actions in the ANAC AD are met by the stated effective date or within the timelines in the ANAC AD.

10. Coordinate with CASA and ANAC approvals where necessary: because the AD cross-references ANAC and allows ANAC-approved revisions of Embraer service bulletins, ensure any deviations, alternative means of compliance, or export/import of parts are cleared with the appropriate authority if required.

These steps are derived from the AD’s explicit requirements and references. The AD’s operative content is limited to incorporation by reference and AFM/placard instructions; therefore strict compliance depends on applying the full content of the referenced ANAC AD and Embraer service bulletins in the operational environment.