{"id":"F2007L03993","name":"AD/A119/10 - Hydraulic Pipe Interference","slug":"ad-a119-10-hydraulic-pipe-interference","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":160787,"registerId":"commonwealth-F2007L03993-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Agusta A119 Series Helicopters","sectionType":"division","heading":"Agusta A119 Series Helicopters","content":"### Agusta A119 Series Helicopters\n\n| AD/A119/10 | Hydraulic Pipe Interference | 11/2007 |\n| ---------- | --------------------------- | ------- |\n\n| Applicability: | Agusta Model A119 helicopters fitted with hydraulic pipes Part Number (P/N)109-0761-64-103 or P/N 109-0761-65-103.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Inspect and replace as necessary, the hydraulic pipes detailed in the applicability section of this AD, in accordance with Part I and Part II of Agusta Bollettino Tecnico (BT) 119-22.2. Replace hydraulic pipes, P/N 109-0761-64-103, and P/N 109-0761-65-103 with new pipes P/N 109-0763-96-101 and P/N 109-0763-97-101 in accordance with Part II of Agusta BT 119-22.Installation of new pipes P/N 109-0763-96-101 and P/N 109-0763-97-101 is a terminating action for the inspections detailed in Requirement 1 and 2 of this AD.3. Do not install hydraulic pipes with P/N 109-0761-64-103 and P/N109-0761-65-103 on any Agusta A119 helicopter.Note: EASA AD 2007-0231dated 23 August 2007 refers. |\n| Compliance:    | 1. Within the next 50 flight hours after the effective date of this AD, and thereafter at intervals not to exceed 100 flight hours.2. No later than 31 July 2008.3. From 31 July 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 25 October 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n\n| Background: | Some cases of interference between the hydraulic pipe and the tail rotor control rod assembly have been detected on A109E helicopters, Agusta issued the “Bollettino Tecnico” 109EP-73 and 119-22, in order to provide instructions to check for possible interference in the affected area and also to introduce two new pipes P/N109-0763-96-101 and P/N 109-0763-97-101, that coupled with a new fixing method allow increasing the clearance between pipes and the tail rotor control rod assembly. The interference, if not corrected, could damage the hydraulic pipes and lead to the loss of the hydraulic system N° 1 in flight. This AD is issued to extend the same mandatory corrective actions to A119 model due to its design similarity with A109E. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n6 September 2007","sortOrder":0},{"sectionNumber":"AD/A119/10","sectionType":"part","heading":"AD/A119/10","content":"## AD/A119/10","sortOrder":1},{"sectionNumber":"Hydraulic Pipe Interference","sectionType":"part","heading":"Hydraulic Pipe Interference","content":"## Hydraulic Pipe Interference","sortOrder":2},{"sectionNumber":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical interference issue on a single helicopter model. The directive explicitly states it extends existing corrective actions from the similar A109E model to the A119 due to design similarity, which is consistent with standard aviation safety practice rather than scope creep."},"complexity_factors":["Short, single-purpose directive with only 3 requirements","Clear applicability criteria based on specific part numbers","Straightforward compliance timeline with 3 distinct deadlines","Minimal cross-referencing (only to Agusta Bollettino Tecnico 119-22 and EASA AD 2007-0231)","No nested exceptions or conditional logic — requirements apply uniformly to all affected aircraft","Only 2 defined part numbers in the applicability section"],"plain_english_summary":"This AD requires owners/operators of Agusta A119 helicopters fitted with hydraulic pipes P/N 109-0761-64-103 or 109-0761-65-103 to inspect and ultimately replace those pipes with improved parts, with the old pipes banned after 31 July 2008.  \n\nIt addresses pipe chafing against the tail-rotor control rod that can lead to complete main hydraulic failure in flight — a critical safety risk already resolved on similar A109E helicopters."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The measure extends corrective actions previously issued for A109E helicopters to the A119 model because of design similarity (Background). The AD, however, is limited to A119 helicopters fitted with the two specific old pipe part numbers and also prohibits future installation of those P/Ns (Applicability; Requirement 3)."},"complexity_factors":["Narrow applicability tied to specific part numbers (P/N 109-0761-64-103 and P/N 109-0761-65-103)","Multiple compliance timings: an initial 50-flight-hour window, recurring 100-flight-hour inspections, and an absolute replacement deadline (no later than 31 July 2008)","Terminology of 'terminating action' — installing specified new P/Ns ends recurring inspections","Dependence on Agusta Bollettino Tecnico 119-22.2 (Parts I & II) for inspection and replacement procedures","Prohibition on reinstalling old pipe P/Ns (affirmative installation ban)","Safety-critical failure mode (hydraulic system No.1 loss) increases operational urgency","Recordkeeping and scheduling burden for operators to meet intervals and replacement deadline"],"plain_english_summary":"This directive requires operators of Agusta A119 helicopters fitted with hydraulic pipes P/N 109-0761-64-103 or P/N 109-0761-65-103 to inspect and, if needed, replace those pipes following Agusta Bollettino Tecnico 119-22.2, and to fit new pipes P/N 109-0763-96-101 and P/N 109-0763-97-101 (fitting the new pipes ends the inspection requirement). It responds to detected pipe/tail-rotor control-rod interference that could damage hydraulic lines and risk loss of hydraulic system No.1; operators pay the inspection and replacement costs and must schedule compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a119-10-hydraulic-pipe-interference","history":"/api/acts/ad-a119-10-hydraulic-pipe-interference/history","analysis":"/api/acts/ad-a119-10-hydraulic-pipe-interference/analysis","conflicts":"/api/acts/ad-a119-10-hydraulic-pipe-interference/conflicts","importantCases":"/api/acts/ad-a119-10-hydraulic-pipe-interference/important-cases","documents":"/api/acts/ad-a119-10-hydraulic-pipe-interference/documents"}}