AD/SWSA226/97 Amdt 1 - Chafing or Arcing Electrical Wiring

The Directive organises the airworthiness response to a hazard,chafing or arcing of electrical wiring that could burn a hole in hydraulic or bleed-air tubing and lead to hydraulic fluid leaks or fire,by deploying standard regulator tools: model-specific applicability, normative service information, inspection mandates, corrective action obligations, compliance windows and recurring inspection intervals, and pathways for credit and equivalence. These are the explicit concepts in the source.

Scope and applicability: The Directive lists precise models and serial-number ranges for SA226 and SA227 types (for example SA226‑AT S/N AT‑001 through AT‑419; SA226‑T S/N T‑201 through T‑248; SA227‑AC, S/N AC‑420 through AC‑539 and others; and others listed in the Applicability table). It also separately lists requirements applicable to "all S/N" for specific models (for example Requirement 3 applies to SA226‑AT, SA226‑T, SA226‑TC, SA227‑AC, SA227‑AT, SA227‑CC and SA227‑DC, all S/N; Requirements 4 and 5 apply to SA227‑BC all S/N).

Service information as normative specification: The Directive mandates particular service bulletins as the means to accomplish the requirements (for example M7 Aerospace SA226 Series SB 226‑24‑019 revised 21 Nov 2008 or Fairchild SB 24‑019 revised 17 May 1983 for Requirement 1 on certain models). Different SBs are prescribed per model group; later revisions of those SBs that the FAA has approved as AMOCs to FAA AD 2009‑11‑06 are explicitly accepted as equivalent for compliance with this Directive.

Conditional, staged compliance logic: The instrument distinguishes between (a) initial mandated inspection/mitigation actions with relatively short lead times (e.g. "within 250 hours TIS after 28 Aug 2008" or after 30 July 2009), (b) immediate corrective actions required "before further flight" when an inspection finds defects (Requirement 6), and (c) a recurring inspection programme (Requirement 3 and 5 repeated at intervals not to exceed 12 months). Requirement 2 is conditional on whether a 0.50‑inch clearance between a bleed air line and battery cable tubing can be achieved following Requirement 1 modification,if not, more invasive rerouting and access panel installation is required "before further flight".

Credit and transition provisions: The Directive explicitly allows credit for inspections performed under the cancelled AD/SWSA226/96 or Amdt 1, stating that an inspection in accordance with the superseded Directive that is equivalent to the inspection required by the current Directive is acceptable and that the 12‑month interval for repetitive inspections should start from the date that initial inspection was accomplished per the superseded Directive. The Directive also declares that it supersedes AD/SWSA226/96 Amdt 1 which will be cancelled.

Safety hazard and causal mechanism: The background states the intended hazard to be addressed: chafing or arcing of wires could expose conductors and cause arcing, leading to burning a hole in hydraulic or bleed-air lines, producing hydraulic fluid leakage and a possible fire in the engine nacelle compartment. The corrective measures (firesleeving, clamps, rerouting, inspection and replacement) directly address the mechanical proximity and abrasion risks and insulation deterioration the background identifies.

Interplay with FAA actions and parts constraints: The Directive records that FAA AD 2008‑12‑16 initiated the FAA requirements and that subsequent FAA AD 2009‑11‑06 corrected omissions and regrouped models. The Directive also records M7 Aerospace notified the FAA of parts‑availability updates and that operators identified model applicability issues. The Directive contemplates later SB revisions approved by FAA as acceptable AMOCs.

Administrative formality: The Directive is dated and signed by a CASA delegate (James Coyne) and is presented as an amendment (Amdt 1) with explicit effective dates. It contains Notes (Note 1 and Note 2) that provide practical flexibility (Note 1 identifies an optional SB that "may be incorporated" and Note 2 explains credit for prior inspections). The Directive contains structured compliance timing for each Requirement.

The Directive affects the registered operators, owners and maintenance organisations responsible for aircraft in the specific SA226 and SA227 model series and serial-number ranges listed. Specifically, the Applicability table names the models and serial numbers subject to Requirement 1, while other Requirements list additional models and "all S/N" ranges. A non‑exhaustive list drawn from the Directive includes aircraft of types:

• SA226‑AT (serial numbers AT‑001 through AT‑419 for Req 1; other S/N subsets for Req 2);
• SA226‑T (S/N T‑201 through T‑248 for Req 1);
• SA226‑TC (S/N TC‑201 through TC‑419 for Req 1; different S/Ns for Req 2);
• SA227‑AC (C‑26A) and SA227‑AT (with specified S/N ranges and some gaps);
• SA227‑BC (C‑26A) (all S/N for Requirements 4 and 5);
• SA227‑CC and SA227‑DC (C‑26B) (covered by Requirement 3 inspections, all S/N).

The text also affects the following categories of actors:

• Licensed maintenance organisations and certifying staff: the Directive requires inspections and repairs in accordance with service information. Those who perform maintenance must follow the referenced service bulletins (M7 Aerospace or Fairchild SBs).
• Continuing airworthiness and compliance personnel within operator organisations: they must schedule initial inspections within the prescribed TIS windows and implement recurring inspections at defined intervals (for example every 12 months where required), maintain records, and manage any follow‑on corrective actions before further flight where defects are found (Requirement 6).
• Parts suppliers and MROs: the Directive references firesleeving, clamps, rerouting work and installation of new access panels. MROs must source appropriate parts and materials and may need to apply SB‑specific parts not readily available (the background notes parts availability led to SB updates).
• Regulators and delegated persons: CASA is the issuer (document is signed by a CASA delegate). The Directive references FAA actions (FAA AD 2008‑12‑16 and FAA AD 2009‑11‑06) and accepts FAA‑approved SB revisions as AMOC where those are approved to the FAA AD.

Those not affected: aircraft outside the listed models/serial number ranges are not targeted by this Directive. Also, Note 1 identifies an optional SB (Swearingen Aviation Corporation SA226 Series SB 57‑010 revised 15 Dec 1975) that may be incorporated but is not required; operators who have not installed the access panel may find the optional SB practically useful.

The Directive also affects flight operations through "before further flight" obligations: where an inspection finds any sign of insulation deterioration, chafing or arcing, Requirement 6 mandates repairs or replacements before further flight. That makes immediate operational availability contingent on maintenance resources and parts.

Duties

• Perform the specific inspections and modifications listed in Requirements 1-6 within the prescribed compliance times. For example, many initial inspections are required "within 250 hours time in service (TIS) after 28 August 2008" or "within 250 hours TIS after 30 July 2009" depending on the Requirement (see the Compliance section of the Directive). Requirement 3 inspections are to be repeated "thereafter at intervals not to exceed 12 months".
• For the S/N subsets in Requirement 1, inspect main battery leads running forward from the battery compartment for deterioration, cover four‑gauge wires leaving the battery box with firesleeving and secure them with a clamp, accomplished using the listed SBs for the model (e.g. M7 SB 226‑24‑019 revised 21 Nov 2008 or Fairchild SB 24‑019 revised 17 May 1983).
• For the S/N subsets in Requirement 2, reroute hydraulic tube assemblies in the right wing leading edge, reroute battery cables and a 22‑gauge wire bundle, and install a new access panel forward of the battery box using the listed SBs. Requirement 2 is triggered where a minimum 0.50‑inch clearance between the bleed air line and battery cable tubing could not be obtained following the Requirement 1 modification; in that scenario Requirement 2 must be accomplished "before further flight".
• Inspect wiring, hydraulic tube assemblies and bleed‑air tube assemblies at the LH/RH inboard wing leading edge/battery box areas, wing stations 51.167 to 81.174 and all feed‑through locations into the inboard keelson for evidence of chafing or arcing (Requirement 3 and 5) using the SBs specific to the model.
• Where any evidence of insulation deterioration, chafing, or arcing is found, clear, repair and/or replace all affected electrical wires and components, hydraulic tube assemblies, and bleed air tube assemblies "before further flight" (Requirement 6).
• Comply with the referenced SBs specified for each Requirement and model group. The Directive lists the exact SB numbers and revision dates for the models concerned.

Rights and transition/limited discretionary allowances

• Credit for prior work: The Directive provides that any inspection accomplished in accordance with the superseded AD/SWSA226/96 or Amdt 1 that is equivalent to any inspection required by this Directive is acceptable for compliance. Where credit is granted, the 12‑month interval for repetitive inspections commences from the date the initial inspection was done under the superseded Directive (Note 2).
• Use of later SB revisions approved by FAA: Later revisions of the referenced SBs, if approved by the United States Federal Aviation Administration as an AMOC to FAA AD 2009‑11‑06, are explicitly declared acceptable for compliance with the equivalent Requirements of this Directive. That provides a path to use updated OEM/parts data if the FAA has approved the later SB as an AMOC.
• Optional incorporation of SB 57‑010: Note 1 explicitly states that incorporation of Swearingen Aviation Corporation SA226 Series SB 57‑010 (revised 15 Dec 1975) may be performed on aeroplanes that have not installed the access panel. It is framed as optional ("may be incorporated"), but the Directive notes practical convenience: installation of the access panel simplifies subsequent SB incorporation and inspections.

Practical obligations implicit in the text

• Maintenance must follow the normative SB procedures for inspection technique, part numbers and repair methods. The Directive does not itself include repair detail beyond mandating the SBs; it requires adherence to the service information cited.
• Records of compliance: while the Directive text does not specify record‑keeping mechanics, operators will need to record timing to demonstrate initial compliance (e.g. "within 250 hours TIS after X date") and to establish the 12‑month recurring inspection cycle, particularly where credit is taken for prior inspections per Note 2.

Constraints and model-specificity

• The Duty to comply is model and serial-number specific. Failing to map your aircraft to the exact S/N ranges listed could lead to non‑compliance risk or unnecessary work; the Directive corrects a previous typographical error regarding an SA226‑TC model, underscoring the importance of precise applicability.

The Directive text itself does not specify penalties, fines or criminal sanctions. It is framed as an airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) and is signed by a CASA delegate (James Coyne), with stated effective dates. The Directive includes compliance specifications (for example, "Within 250 hours TIS after 28 August 2008", "before further flight", and recurring 12‑month intervals) and declares that this Amendment becomes effective on 24 September 2009.

What the source states, and what it does not state:

• The Directive sets out mandatory technical requirements and compliance times (Requirements 1-6 and the Compliance paragraph) but contains no text prescribing civil penalties, suspension procedures or prosecutions. Thus the instrument itself does not detail enforcement mechanisms or penalty quantum.
• The document does not include a regulatory enforcement rubric; it does not, for example, state a fine schedule, enforcement process or administrative sanctions in the text provided.

Implications for practitioners based on the Directive text:

• Because the Directive imposes "before further flight" and timed compliance requirements, failure to carry out required inspections and corrective action within the specified windows will leave an aeroplane non‑compliant with the Directive. Demonstrating compliance will require documentary proof of the inspections and corrective actions using the referenced SBs.
• The Directive accepts later SB revisions approved by the FAA as AMOCs; therefore, relying on an FAA‑approved AMOC can be evidence of compliance with the Directive when such SB revisions exist and are properly documented.

Limits on what can be said from the source:

• The Directive does not state who will be penalised, how CASA will detect non‑compliance, what administrative processes will be used, or the sanctions available. Any further assertions about enforcement powers, monitoring or penalties would require reference to CASA enforcement statutes, regulations or enforcement policy, none of which are included in the provided text.

The Directive explicitly interacts with other airworthiness instruments and service information. The source cites and relies on the following external instruments and mechanisms, and frames those interactions as follows:

Reference to and reliance on FAA ADs

• The Directive records that FAA AD 2008‑12‑16 originally required inspection of wiring and tube assemblies for chafing, arcing and insufficient clearance and that CASA subsequently issued AD/SWSA226/96 to reflect those FAA requirements. The Directive states the FAA later issued AD 2009‑11‑06 which corrected applicability omissions and updated service information; the Directive mirrors those FAA changes while retaining certain compliance date conventions (the original Directive retained the initial inspection compliance of "within 250 hours TIS after 28 August 2008").
• The Directive expressly lists FAA AD 2009‑11‑06 in Note 3 ("FAA AD 2009‑11‑06 Amdt 39‑15916 refers").

Alternate Methods of Compliance (AMOCs) and acceptability

• The Directive states: "Later revisions of the above SBs, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2009‑11‑06 are considered acceptable for compliance with the equivalent Requirements of this Directive." This is an explicit cross‑recognition mechanism: CASA will accept FAA‑approved SB revisions as satisfying equivalent Requirements of this Directive. The interaction here is one of delegated technical acceptability for later SB revisions via FAA AMOC processes.

Supersession and credit for prior requirements

• The Directive supersedes an earlier Australian Directive AD/SWSA226/96 Amdt 1, which the text says will be cancelled. It also gives credit for inspections done under the superseded Directive where they are equivalent to the new inspections, and sets the start date for the recurring 12‑month interval accordingly. That creates a temporal interface between this Directive and the prior Australian Directive.

Service bulletins as the operative technical standard

• The Directive makes the OEM and M7 Aerospace service bulletins normative: each Requirement must be accomplished "using service information as follows" and then lists specific SB numbers and revision dates for the specific models. In doing so it binds compliance to particular technical methods and parts set out in those SBs, subject to the acceptance of later SB revisions if those are FAA‑approved as AMOCs.

Parts availability and SB updates

• The Directive records in the Background that M7 Aerospace notified the FAA of parts availability issues and that operators identified model applicability issues, and that the FAA AD 2009‑11‑06 corrected these deficiencies. This indicates the Directive’s practical interaction with supply‑chain realities and with FAA processes for AMOCs and SB revisions. Practically, operators must look to the SBs and to FAA approvals for appropriate parts and procedures.

Limitations in the source

• The Directive does not set out how CASA will coordinate acceptance of FAA AMOCs beyond the statement that FAA‑approved SB revisions are acceptable. It also does not describe interaction with other Australian laws directly (for example Civil Aviation Regulations, enforcement statutes or civil liability rules) in this text. Any legal or regulatory consequences outside the technical compliance obligations in the Directive itself (for example, licence or certificate actions or civil liability) are not addressed in the document as provided.

For practitioners this means the Directive functions as a technical compliance instrument that references FAA instruments and SBs for method and acceptability, but any legal enforcement, licensing or broader regulatory consequences would be governed by separate instruments and statutes not contained in the Directive text.

The document explicitly describes itself as "AD/SWSA226/97 Amdt 1" and contains a short amendment history and effective dates. From the source text we can extract the following timeline and changes:

• Predecessor: AD/SWSA226/96 (and AD/SWSA226/96 Amdt 1). The Directive states that the original issue of this Directive superseded AD/SWSA226/96 Amdt 1, and that the latter was cancelled. The Directive grants credit for inspections accomplished under the superseded Directive where those inspections are equivalent.

• FAA antecedents: The Background explains that FAA AD 2008‑12‑16 initially required inspections for chafing/arcing and that CASA issued AD/SWSA226/96 reflecting those requirements. After that, M7 Aerospace notified the FAA of issues and the FAA issued AD 2009‑11‑06 which corrected omissions and regrouped aeroplane models. The Australian Directive reflects the FAA changes and retains certain compliance conventions.

• Original issue effective date: The Directive states "The original issue of this Directive became effective on 30 July 2009." Elsewhere the Compliance text references initial inspection timing "after 28 August 2008 (the effective date of AD/SWSA226/96)". That indicates a chain of timing conventions between AD/SWSA226/96 and this Directive's original issue.

• This Amendment effective date: The document states "This Amendment becomes effective on 24 September 2009." The heading itself shows "AD/SWSA226/97 Amdt 1" and the footer is signed 14 August 2009 by a CASA delegate (James Coyne), with the amendment noted as effective 24 September 2009.

• Purpose of the Amendment: The background describes that this Amendment "continues the requirements of the original issue but corrects a typographical error in the Applicability Statement by correctly identifying a SA226‑TC model aeroplane." Thus the Amendment is not introducing new technical measures but correcting the model identification.

• Supersession and credit rules: Note 2 clarifies credit for prior inspections and that the 12‑month interval for repeating inspections should start from the date the initial inspection was accomplished under the superseded Directive.

• Relationship to FAA AD 2009‑11‑06: The Directive states that later revisions of the SBs that are approved by the FAA as an AMOC to FAA AD 2009‑11‑06 are acceptable for compliance with the equivalent Requirements of this Directive. That is an ongoing avenue for technical amendments via SB revisions approved by the FAA.

Practical reading for compliance management: Operators must be attentive to model/appl icability corrections, credit for prior work, and potential subsequent amendments. The Amendment here corrected a typographical identification (SA226‑TC) , an amendment with a targeted administrative fix rather than a substantive change to the technical requirements. The Directive also signals that further technical updates may be handled via SB revisions and FAA AMOCs.

The Directive text contains no litigation history or references to cases, proceedings or contested enforcement actions. It does not cite any judicial decisions or administrative appeals. The document is presented as an administrative airworthiness Directive issued by CASA and signed by a delegate (James Coyne), with effective dates and background explanation. No litigation, judicial review, appeals or enforcement proceedings are described or referenced in the provided text.

Implications for practitioners:

• There is no source material here that documents how courts or tribunals have interpreted this Directive or enforced compliance.
• Any questions about judicial review, challenges to CASA directives, or precedent on compliance obligations, liability for aircraft operators, or the evidentiary sufficiency of inspections and repairs would need to rely on other authorities (cases, enforcement records, or tribunal decisions) that are not included in this Directive.
• If a practitioner needs to assess litigation risk or precedential outcomes from non‑compliance with ADs, they will need to consult external case law, regulatory enforcement records, or administrative review decisions outside this document.

1. Precise serial‑number applicability is critical

• The Directive lists narrowly defined S/N ranges per model for specific Requirements (for example Requirement 1 covers SA226‑AT S/N AT‑001 through AT‑419; SA226‑T S/N T‑201 through T‑248; SA226‑TC S/N TC‑201 through TC‑419; and specific AC/AT blocks for SA227). If an operator misidentifies a serial number (or relies on a generic "SA226" label), they risk either missing required work or performing unnecessary modifications. The Amendment corrected a typographical error regarding SA226‑TC, which shows applicability errors have occurred in past ADs.

2. Different Requirements use different SBs and different compliance windows

• Each Requirement names specific SBs and specific revision dates that must be used to accomplish the work. Using the wrong SB revision could lead to non‑compliance unless it is a later SB revision approved by FAA as an AMOC to FAA AD 2009‑11‑06 (the Directive accepts such FAA‑approved SB revisions). Practically, this requires checking SB revision status and FAA AMOC approvals.

3. Timing nuances and multiple effective dates

• The Directive uses more than one reference date for initial compliance windows: some inspections are to be done "within 250 hours TIS after 28 August 2008 (the effective date of AD/SWSA226/96)", while other Requirements reference "within 250 hours TIS after 30 July 2009 (the effective date of the original issue of this Directive)". Operators must map these dates correctly to their maintenance scheduling and aircraft time in service accounting. Note 2 further complicates scheduling by allowing credit for prior inspections and restarting the 12‑month recurring interval from the date of that prior inspection.

4. Conditional “before further flight” Requirement 2 trigger

• Requirement 2 is conditioned on whether, after the Requirement 1 modification, a minimum 0.50‑inch clearance between the bleed air line and the tubing on the battery cables can be obtained. If the clearance cannot be obtained, the more intrusive rerouting and access-panel installation must be done "before further flight". That means an operator might perform Requirement 1 then discover Requirement 2 is immediately triggered , causing aircraft downtime until rerouting and access panel work is completed. The compliance text says Requirement 2 must be done "Before further flight after the Requirement 1 modification and a minimum 0.50‑inch clearance ... was not able to be obtained."

5. Access panel: optional SB but practical effect

• Note 1 states incorporation of Swearingen SB 57‑010 "may be incorporated" and that installation of the access panel will simplify future SB incorporation and inspections. The SB is optional but can materially affect the ease and cost of complying with other Requirements, so operators without the access panel may face higher labour costs and access constraints.

6. Parts availability and SB updates

• The Background records that M7 Aerospace updated some service information due to parts availability and that operators identified applicability issues. That indicates the possibility of supply chain constraints or part obsolescence, which could delay compliance or require alternative parts where approved. The Directive accepts FAA‑approved SB AMOCs as equivalent, but obtaining FAA AMOC approvals or alternative parts could affect schedule and cost.

7. Recurrence interval and start date ambiguity

• Requirement 3 (and Requirement 5 for SA227‑BC) requires inspections "thereafter at intervals not to exceed 12 months." Note 2 instructs that if credit is taken for prior equivalent inspections under superseded Directives, the 12‑month interval should start from the date of that initial inspection. Operators must document equivalent inspections carefully to establish the correct start date for the recurring inspection interval.

8. Repair standard tied to SBs

• The Directive mandates repair/replace actions "as required following the applicable service information referenced in Requirements 1, 3, 4 and 5." That means repair acceptability depends on conformity with the SB procedures; if an operator proposes an alternate repair method, it will require an AMOC or regulatory acceptance. The Directive does not itself describe alternative repair standards.

9. The Directive does not set out enforcement penalties

• The document does not contain penalty language or enforcement process; however, the "before further flight" language imposes an operational constraint. Operators need to treat "before further flight" as an absolute operational stop for the aircraft until corrective action is documented, even though the Directive text itself does not state enforcement mechanisms.

10. Interplay with FAA ADs and AMOCs

• The Directive accepts FAA‑approved SB revisions as AMOC to FAA AD 2009‑11‑06 for compliance equivalence. Operators relying on FAA approvals must ensure the FAA's AMOC applies to the specific SB revision and to the specific Requirement in this Directive. Cross‑jurisdictional reliance requires careful documentary proof.

This section provides a practical, source‑grounded checklist and operational steps to meet the Directive’s Requirements, using only material present in the Directive text. It does not invent procedures beyond the referenced service bulletins; it sets out the administrative and process steps that the Directive imposes.

1. Identify affected aircraft

• Cross‑check each aircraft’s model and serial number against the Applicability lists in the Directive before deciding which Requirements apply. The Directive splits applicability by model and S/N; do not assume all SA226/SA227 types are covered uniformly. For example, Requirement 1 applies to a defined subset of SA226‑AT, SA226‑T, SA226‑TC, SA227‑AC and SA227‑AT S/N ranges. Requirement 3 covers additional models and all S/N.

2. Obtain and review the service bulletins specified for your model/Requirement

• For each applicable Requirement, obtain the exact SB(s) and revisions referenced in the Directive:
  • For models SA226‑AT, SA226‑T, SA226‑TC (Requirement 1): M7 Aerospace SA226 Series SB 226‑24‑019, revised 21 Nov 2008; or Fairchild SA226 Series SB 24‑019, revised 17 May 1983.
  • For SA227‑AC and SA227‑AT (Requirement 1): M7 SB 227‑24‑001 revised 21 Nov 2008; or Fairchild SA227 Series SB 24‑001 revised 17 May 1983.
  • For Requirement 2 model groups, and for Requirement 3, 4, 5: the Directive lists the applicable SB numbers and revision dates , ensure you use the correct SB for the model and S/N.
• If an operator wants to use later SB revisions, verify that those later SBs have been approved by the FAA as AMOCs to FAA AD 2009‑11‑06; the Directive explicitly accepts FAA‑approved SB revisions as acceptable for compliance with the equivalent Requirements.

3. Schedule initial inspections within the specified compliance windows

• For Requirements that specify "Within 250 hours TIS after 28 August 2008" or "Within 250 hours TIS after 30 July 2009", compute each aeroplane’s TIS and schedule inspections to meet that window. Keep documentation showing the TIS calculation and inspection dates.
• If you have previously accomplished inspections under the superseded AD/SWSA226/96 or Amdt 1 and they are equivalent, document those inspections and apply the credit provision in Note 2 to establish the start date for the 12‑month recurring cycle.

4. Perform the required physical work according to the SBs

• Requirement 1 actions include inspecting the main battery leads forward of the battery compartment, covering four‑gauge wires with firesleeving and securing them with a clamp. Perform these procedures as per the SB instructions for the model.
• Requirement 2 (where triggered) requires rerouting hydraulic tube assemblies in the right wing leading edge, rerouting battery cables and the 22‑gauge wire bundle, and installing a new access panel forward of the battery box. These are more invasive tasks and must be done using the specified SB instructions for the model and S/N.
• Requirement 3 and 5 inspections require visual inspection of wiring, hydraulic and bleed‑air tubing at LH/RH inboard wing leading edge/battery box areas and wing stations 51.167-81.174 and all feed‑through locations into the inboard keelson. Use the SB inspection methods and repair criteria.
• Requirement 6: If any evidence of insulation deterioration, chafing, or arcing is found, clear, repair and/or replace the affected parts "before further flight", following the repair methods and parts guidance in the applicable SB.

5. Understand the conditional trigger for Requirement 2

• After performing Requirement 1 modifications, check clearance between the bleed air line and tubing on the battery cables. If a minimum 0.50‑inch clearance cannot be obtained, Requirement 2 must be completed before the aircraft is released to further flight. That means plan for potential additional work and associated aircraft downtime when scheduling Requirement 1.

6. Recurring inspections and recordkeeping

• For Requirements that require recurring inspections (Requirement 3 and Requirement 5), schedule subsequent inspections at intervals "not to exceed 12 months." Record the date of the applicable initial inspection (or the prior inspection for which credit was taken per Note 2) as the reference date for the recurring 12‑month interval.
• Maintain maintenance records evidencing the inspections, SB references, and any repairs/replacements made in order to demonstrate compliance with the Directive and to establish the correct recurring inspection timeline.

7. Parts, materials and SB updates

• Anticipate the need to source firesleeving, clamps, access panels and tubing or hose parts specified in the SBs. The Background notes parts availability led to SB updates; if parts are not available, check for later SB revisions and FAA‑approved AMOCs that permit alternative parts or procedures.
• If using later SB revisions, ensure they have been approved by the FAA as an AMOC to FAA AD 2009‑11‑06, because the Directive expressly accepts such FAA AMOC approvals as acceptable for compliance.

8. Use of optional SB for access panel

• Note 1 identifies Swearingen SB 57‑010 (revised 15 Dec 1975) as an optional way to install an access panel. Consider installing the access panel where not already fitted to simplify inspections and future SB incorporations. The Directive notes the access panel simplifies the incorporation of SBs and future inspections but does not mandate the SB.

9. Documentation for equivalence and AMOCs

• If you rely on an earlier inspection for credit, document the inspection method, date and equivalence to the current Requirement as stated in Note 2. If you rely on FAA‑approved SB revisions (AMOCs), keep FAA documentation showing the AMOC approval and the equivalence to the Requirement in this Directive.

10. Operational considerations

• Treat any Requirement 6 finding (evidence of insulation deterioration, chafing or arcing) as an immediate grounding condition for that aircraft until affected components have been cleared/repaired/replaced as called for by the SBs; the Directive requires repair "before further flight".
• Build maintenance windows that allow for unexpected Requirement 2 work following Requirement 1 inspections.

11. Compliance proof and regulatory interface

• The Directive does not itself set out an enforcement mechanism in the provided text. However, operators should maintain contemporaneous maintenance records, SB compliance sheets, parts invoices and signed maintenance release documentation indicating that the work was done in accordance with the referenced SBs, along with records showing clearance checks, repairs and the dates and signatures of certifying maintenance personnel.

By following the sequence above , identify applicability, obtain the specified SBs, schedule and perform inspections within the stated windows, complete required repairs before further flight where defects are found, manage recurring inspections annually, document credit and AMOC reliance , operators and maintainers will meet the procedural obligations the Directive sets out.