Identify applicability precisely: Step one is to determine whether each EC 120B helicopter in your fleet is fitted with engine‑to‑MGB coupling tube P/N C631A1101101 and/or an engine mount comprising the parts detailed in paragraph 1.A. of Eurocopter EC120 ASB No. 04A005 (Applicability). Verify serial numbers to classify each helicopter as prior to serial number 1170 or serial number 1170 and higher, and determine whether Eurocopter SB 71.003 and/or SB 71.005 have been incorporated. Accurate records of past modifications, part fitment and part provenance are essential.
Map each aircraft to the correct Requirement: Using the classification variables (serial number; SB 71.003 modification status; SB 71.005 modification status), select the applicable Requirement(s):
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If not modified per SB 71.003, prior to serial 1170, and not modified per SB 71.005: follow Requirement 1 (visual inspection per ASB 05A003 para 2.B; remove cracked assemblies; remove coupling tubes in certain cases; compliance timing: prior to further flight and thereafter at intervals not exceeding 5 flight hours; removal prior to 1,000 hours TIS).
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If prior to serial 1170 and not incorporating an engine mount modified per SB 71.003: follow Requirement 2 (remove specified engine mount components detailed in ASB 04A005; timing per Amdt 3, prior to 30 June 2004).
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If serial number 1170 and higher or incorporates SB 71.003 but not SB 71.005: follow Requirement 3 (visual inspection per ASB 05A003 para 2.B; remove cracked assemblies; removal prior to 20,000 hours TIS; initial inspection within 25 flight hours and thereafter at intervals not exceeding 25 flight hours).
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If helicopter has been modified per SB 71.005: follow Requirement 4 (remove all P/N C631A1101101 assemblies; compliance prior to exceeding 20,000 hours TIS).
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For spares: follow Requirement 5 (dye‑penetrant inspection per SB 71.005 para 2.B, before fitment to helicopters modified per SB 71.005 where the coupling tube was previously fitted to an unmodified helicopter).
Obtain and follow the referenced Eurocopter documents: The inspections and removal actions are framed "in accordance with" specific paragraphs of Eurocopter ASB No. 05A003 (Paragraph 2.B), ASB No. 04A005 (Paragraph 1.A), and SB No. 71.005 (paragraph 2.B). Practically, you must obtain those ASB/SB paragraphs and carry out inspections and removal procedures in strict conformity with the manufacturer's instructions as referenced in the AD.
Schedule and resource inspections in line with compliance timing: For Requirements that are "prior to further flight" or that establish short re‑inspection intervals (5 flight hours, daily checks), schedule immediate inspections and adjust operational planning to allow for grounding where necessary. For Requirements that require inspection "within 25 flight hours" and thereafter at 25‑flight‑hour intervals, build an inspection schedule and allocate maintenance slots accordingly. For life‑limit removals (1,000 or 20,000 hours TIS), plan for part replacement well before the TIS threshold is reached.
Address removal from service and part replacement: Where the AD requires parts to be removed from service (e.g., cracked assemblies, all P/N C631A1101101 assemblies for SB 71.005‑modified helicopters), arrange for removal, disposal or quarantine, and replacement with approved parts. Check Eurocopter guidance for approved replacement parts and consider lead times for sourcing parts.
Manage spares and traceability: For parts held as spares (Requirement 5), perform the dye‑penetrant inspection per SB 71.005 para 2.B before fitment to the specified helicopters. Maintain traceability records showing the part's history (e.g., if the coupling tube was previously fitted to a helicopter not modified per SB 71.005). Ensure stores and logistics processes can provide the provenance information required to determine whether the spare requires inspection before fitment.
Train and document pilot inspection authority: If using pilots to perform and certify the visual inspections in Requirements 1(a) and 3(a), ensure pilots complete an "approved training program" and that the training approval is documented. The AD does not detail who approves the training, so operators should engage with CASA or follow established training approval channels to ensure the pilot's qualification is acceptable. Keep training records and pilot certification on file to support audited compliance.
Record and retain maintenance actions: Although the AD does not set out record‑keeping language, maintain contemporaneous records of inspections, findings (especially any cracks and removal action), parts removed from service, parts installed, TIS at removal, and any pilot training and certification used to perform inspections. These records will be necessary evidence of compliance during CASA audits or airworthiness reviews.
Consider SB 71.005 adoption for terminating action: The Background and Requirement 4 indicate that incorporation of Eurocopter SB 71.005 provides terminating action for the required inspections, but removal of the specified coupling tube P/N C631A1101101 assemblies is mandated. Evaluate the total cost‑benefit and logistics of adopting SB 71.005: immediate cost to adopt and replace parts versus ongoing recurring inspection burden if SB 71.005 is not adopted.
Coordinate with certified maintenance organisations and Eurocopter: Because the inspections and removals reference specific Eurocopter ASB/SB procedures, co‑ordinate with Eurocopter or its authorised service centres for correct procedures, approved replacement parts and any clarifications about the paragraph references (Paragraph 2.B, Paragraph 1.A, etc.). Ensure maintenance organisations will apply the manufacturer procedures exactly as referenced in the AD.
Verify compliance deadlines historically: Requirement 2 retains a deadline "prior to 30 June 2004" as detailed in Amendment 3. If historical compliance is in question (e.g., for aircraft acquired after that date), verify records to show that Requirement 2 actions were completed where applicable.
Plan for operational disruption and cost: The AD's "before further flight" and short interval inspection obligations will cause aircraft downtime and increased maintenance labour. Budget for inspection labour, possible part replacement costs, and scheduling impacts. Where entire assemblies must be removed for SB 71.005‑modified aircraft, plan for procurement and fitment of new coupling tubes and any related parts.
Check cross‑referenced ADs and technical material: Review DGAC AD F‑2003‑325 R1 as it "refers" and read Eurocopter ASB No. 04A005, ASB No. 05A003 and SB No. 71.005 to ensure a complete technical understanding and to apply the referenced inspection and removal methods precisely.
Where uncertainty exists, seek CASA clarification: If there is ambiguity (for example, over what constitutes an "approved training program" for pilot inspection certification, or about acceptable replacement parts), seek clarification from CASA or rely on Eurocopter authorised service centres to ensure the adopted procedures are consistent with the AD's requirements and with CASA expectations.
Keep evidence ready for audits and certification: Maintain copies of the AD, the referenced ASBs/SBs used to perform inspections or removals, pilot training approvals, maintenance records showing dates and TIS at inspection/removal, and proof of parts disposal or quarantine when removed. These documents will be the primary evidence used by CASA or other authorities to verify compliance.