{"id":"F2006L01606","name":"AD/LYC/116 - ECi Connecting Rods","slug":"ad-lyc-116-eci-connecting-rods","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59310,"registerId":"commonwealth-F2006L01606-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Lycoming Piston Engines","sectionType":"division","heading":"Lycoming Piston Engines","content":"### Lycoming Piston Engines\n\n| AD/LYC/116 | ECi Connecting Rods | 7/2006 TX |\n| ---------- | ------------------- | --------- |\n\n```html\n

Applicability:

Lycoming Engines (formerly Textron Lycoming) 360 and 540 series reciprocating engines specified in Table 1 of this AD with Engine Components Incorporated (ECi) connecting rods, part number (P/N) AEL11750 installed, limited to Serial Numbers 54/6 and below and produced between January 2002 and January 2004. They are also identified with forging P/N AEL11488 in raised letters on the web of the beam between the big and small ends of the connecting rod.

If your engine has not been overhauled or had any repair since new, no further action is required by this AD.

Table 1.

Engine models

O-360-A1A, A1AD, A1C, A1D, A1F, A1F6, A1F6D, A1G, A1G6, A1G6D, A1H, A1H6, A1LD, A1P, A2A, A2D, A2E, A2F, A2G, A2H, A3A, A3AD, A3D, A4A, A4AD, A4D, A4G, A4J, A4K, A4M, A4N, A4P, A5AD, B1A, B1B, B2A, B2B, C1A, C1C, C1E, C1F, C1G, C2A, C2B, C2C, C2D, C2E, C4F, C4P, D1A, D2A, D2B, F1A6, G1A6, J2A;

HO-360-A1A, B1A, B1B, C1A;

IO-360-B1A, B1B, B1C, B1D, B1E, B1F, B1F6, B1G6, B2E, B2F, B2F6, B4A, E1A, F1A, L2A;

LO-360-A1G6D, A1H6;

HIO-360-A1A, A1B, B1A, B1B;

AEIO-360-B1B, B1D, B1F, B1F6, B1G6, B2F, B2F6, B4A, H1A, H1B;

O-540-A1A, A1A5, A1B5, A1C5, A1D, A1D5, A2B, A3D5, A4A5, A4B5, A4C5, A4D5, B1A5, B1B5, B1D5, B2A5, B2B5, B2C5, B4A5, B4B5, D1A5, E4A5, E4B5, E4C5, F1A5, F1B5, G1A5, G2A5, H1A5, H1A5D, H1B5D, H2A5, H2A5D, H2B5D;

AEIO-540-D4A5, D4B5, D4C5, D4D5;

IO-540-A1A5, B1A5, B1B5, B1C5, C1B5, C1C5, C2C, C4B5, C4C5, C4D5, C4D5D, D4A5, D4B5, D4C5, E1A5, E1B5, E1C5, G1A5, G1B5, G1C5, G1D5, G1E5, G1F5, J4A5, N1A5, P1A5, R1A5, T4A5D, T4B5, T4B5D, T4C5D, V4A5, V4A5D;

LTIO-540-K1AD;

TIO-540-C1A, E1A, G1A, H1A, K1AD, AA1AD, AB1AD, AB1BD, AF1A, AF1B, AG1A.

\n```\n\n| Requirement: | 1. If the engine was overhauled or repaired since new, inspect the maintenance records and engine logbook to determine if the overhaul or repair facility used ECi connecting rods, P/N AEL11750.If the connecting rods are not ECi, P/N AEL11750, no further action is required.If the connecting rods are ECi, P/N AEL11750, and if the serial number is 54/7 or higher, no further action is required.Note 1: 54 is the lot number and 7 is the serial number of the ECi connecting rod.2. If the connecting rods are ECi, P/N AEL11750, having forging P/N AEL11488 in raised letters on the web of the beam, and if the serial number is 54/6 or lower, do the following:(a) If the connecting rod has 2,000 or more hours time-in- service (TIS), replace the connecting rod with a connecting rod that has a lot number 55 or higher, or that has a P/N not specified in this AD.(b) If the connecting rod has fewer than 2,000 hours TIS, replace the connecting rod with a connecting rod that has a lot number 55 or higher, or that has a P/N not specified in this AD.3. Do not install any ECi connecting rod, P/N AEL11750, that has SN 54/6 or lower into any engine.Note 2: FAA AD 2006-10-21 Amdt 39-14604 dated 12 May 2006 refers. |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | 1. Before further flight, after the effective date of this AD.2. (a) Within 50 hours TIS after the effective date of this AD.2. (b) At the next engine overhaul, or next accessibility of the connecting rod, but no later than 2,000 hours TIS on the connecting rod.For the purpose of this AD, connecting rod accessibility is defined as any maintenance action in which a cylinder assembly is removed for maintenance.3. After the effective date of this AD. |\n| | This Airworthiness Directive becomes effective on 31 May 2006. |\n\n| Background: | The Airmotive Engineering Corp, Division of Engine Components Incorporated (ECi), holds the Parts Manufacturer Approval (PMA) for the affected parts, and markets the parts as ECi parts. This AD requires replacing certain lot and serial numbered connecting rods, P/N AEL11750, having forging part number AEL11488. This AD would also prohibit installing certain ECi connecting rods, P/N AEL11750, into any Lycoming 360 or 540 series reciprocating engines. This AD results from reports of connecting rods with excessive variation in circularity of the journal bores. The intent of this AD is to prevent fatigue failure of the connecting rod and a possible uncommanded shutdown of the engine. |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n24 May 2006","sortOrder":0},{"sectionNumber":"AD/LYC/116","sectionType":"part","heading":"AD/LYC/116","content":"## AD/LYC/116","sortOrder":1},{"sectionNumber":"ECi Connecting Rods","sectionType":"part","heading":"ECi Connecting Rods","content":"## ECi Connecting Rods","sortOrder":2},{"sectionNumber":"7/2006 TX","sectionType":"part","heading":"7/2006 TX","content":"## 7/2006 TX","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive's scope matches its stated safety purpose in the Background: it targets ECi connecting rods P/N AEL11750 with forging P/N AEL11488 and lot/serial 54/6 or lower, mandates replacement or prohibition of installation, and sets compliance deadlines to prevent fatigue failure (Background; Requirement; Compliance). No expansion or narrowing beyond that described intent is evident in the text."},"complexity_factors":["Detailed applicability to many engine models (Table 1) increases lookup burden for operators.","Parts identified by two numbers: ECi P/N AEL11750 and forging P/N AEL11488 (Applicability; Requirement).","Lot/serial threshold (lot 54, serial ≤6 triggers action; Requirement) requires owners to interpret serial-format information.","Different compliance triggers: immediate (before further flight), short-term (within 50 hours TIS), or deferred (at next overhaul or ≤2,000 hours TIS) (Compliance; Requirement 2(a)-(b)).","Record-checking obligation when engine was overhauled or repaired (inspect maintenance records and logbook) creates administrative burden (Requirement 1).","Replacement mandate specifies acceptable replacements (lot ≥55 or different P/N), constraining parts sourcing and affecting costs (Requirement 2(a)-(b)).","Absolute installation prohibition for affected rods (Requirement 3) imposes ongoing parts-control obligations.","Cross-reference to FAA AD adds an external regulatory source to consider (Note 2)."],"plain_english_summary":"**What this does.** This Airworthiness Directive requires owners/operators of Lycoming 360 and 540 series engines to identify ECi connecting rods P/N AEL11750 (forging P/N AEL11488) with lot/serial 54/6 or lower and replace them on the timetable set out in the Requirement and Compliance sections. It also forbids installing those specific rods into any engine. \n\n**Who pays and why it matters.** Owners/operators pay for inspections and replacements; compliance times range from before next flight to within 2,000 hours or at overhaul (Requirement 2(a)-(b); Compliance)."},"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":4,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive addressing a specific manufacturing defect in a specific part. The scope remains tightly focused on ECi connecting rods P/N AEL11750 with identified serial numbers. No scope creep is evident."},"complexity_factors":["Multiple conditional pathways based on maintenance history (overhauled vs. never serviced)","Nested serial number logic (lot 54/6 or below vs. 54/7 or higher)","Dual thresholds for replacement timing (hours-based vs. event-based accessibility)","Cross-reference to US FAA AD 2006-10-21 for additional context","Extensive tabular data listing 100+ specific engine model variants","Technical aviation terminology requiring specialised knowledge (TIS, PMA, forging P/N, journal bores)"],"plain_english_summary":"This CASA Airworthiness Directive targets Lycoming 360/540 engines that contain ECi connecting rods (AEL11750, certain serials) manufactured Jan 2002–Jan 2004. Defective journal bores can cause metal fatigue and sudden engine failure.\n\nOwners/operators of engines that have been opened/repaired since new must check records and remove affected rods before unsafe hours are reached; do not install these specific rods in any engine."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lyc-116-eci-connecting-rods","history":"/api/acts/ad-lyc-116-eci-connecting-rods/history","analysis":"/api/acts/ad-lyc-116-eci-connecting-rods/analysis","conflicts":"/api/acts/ad-lyc-116-eci-connecting-rods/conflicts","importantCases":"/api/acts/ad-lyc-116-eci-connecting-rods/important-cases","documents":"/api/acts/ad-lyc-116-eci-connecting-rods/documents"}}