{"id":"F2005L00193","name":"AD/LYC/110 Amdt 1 - Crane / Lear Romec Rotary Fuel Pump Relief Valve Attachment Screws","slug":"ad-lyc-110-amdt-1-crane-lear-romec-rotary-fuel-pump-relief-valve-attachment-screws","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":33673,"registerId":"commonwealth-F2005L00193-current","compilationNumber":null,"startDate":"2026-04-01","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/110 Amdt 1 | Crane / Lear Romec Rotary Fuel Pump Relief Valve Attachment Screws | 3/2005 |\n| ----------------- | ------------------------------------------------------------------ | ------ |\n\n```html\n

Applicability:

Textron Lycoming IO-320, LIO-320, IO-360, HIO-360, TIO-360, LTIO- 360, GO-435, GO-480, IGO-480-A1B6, IO-540, IGO-540, AEIO-540, HIO- 540, TIO-540, LTIO-540, TIGO-541, IO-720, and TIO-720 reciprocating engines, with Crane/Lear Romec RG9080, RG9570, and RG17980 series \"AN\" rotary fuel pumps listed in the following Table:

Table: Applicable Pump Cross Reference List:

Lear/Romec Series

Textron Lycoming Part Number (P/N)

RG9080F2

68262, 68262-85

RG9080J4A

LW-13909, LW-13909-85

RG9080J6A

LW-14444, LW-14444-85

RG9080J7A

LW-13920, LW-13920-85

RG9080J8A

LW-15740, LW-15740-85

RG9570K1

62E22288

RG9570P/P1

LW-19012

RG17980

74547, 74547-85

RG17980A

76188, 76188-85

RG17980D

76486, 76486-85

RG17980E

77443, 77443-85

RG17980J

78993, 78993-85

RG17980K

LW-11166, LW-11166-85

RG17980P

LW-12534, LW-12534-85

RG17980U

62D21153, 62D21

Note 1: This Airworthiness Directive (AD) is not applicable to modified pumps, series RG 9080, RG 9570 or RG17980 with the “/M” after the part number (P/N). The installation of modified pump constitutes terminating action for the inspection requirements of this AD.

Requirement:

1. Perform initial torque check inspection of pump relief valve attaching screws as per provisions of Lycoming SB 529B. If the torque does not meet the SB specifications, tighten screws to the required torque in accordance with that SB.

2. Perform follow-up torque check inspection of pump relief valve attaching screws as per provisions of Lycoming SB 529B. If the torque does not meet the SB specifications, tighten screws to the required torque in accordance with that SB.

3. Visually inspect the pump for leakage of fuel in the area of relief valve for the evidence of fuel leakage and loose or missing attachment screws.

Note 2: FAA Airworthiness Directive 2003-14-03 refers.

Compliance:

1. Unless accomplished earlier, within 10 hours time-in-service (TIS), or 30 days from the effective date of this AD, whichever occurs first.

2. Repetitively, at 55-hour intervals TIS, or 6 months since the previous torque check inspection, whichever occurs first, until the accumulation of 110 hours TIS since the inspection with the torque remaining within the SB specifications.

3. Repetitively, at 55 hours intervals TIS, after satisfying the requirement 2.

Note 3: Replacement of a rotary fuel pump series RG9080, RG9570, or RG17980, with an unmodified pump (without the \"/M\" after the part number) requires repeating the initial and follow-up inspections in accordance with the requirement 1, 2 and 3 of this Directive.

This Amendment becomes effective on 17 March 2005.

Background:

The amendment 1 is issued in response to a review of an AD application. The application requested an inspection interval of 55 hours or 10% tolerance.

The actions specified by this AD are intended to prevent rotary fuel pump leaks, which could result in an engine failure, engine fire, and damage to or loss of aircraft.

The original issue of this AD is based on FAA AD 2003-14-03 and supersedes CASA AD/FSM/25 Amendment 4.

\n```\n\n| | The original issue of this Directive became effective on 17 February 2005. |\n| --- | -------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n4 February 2005","sortOrder":0},{"sectionNumber":"AD/LYC/110 Amdt 1","sectionType":"part","heading":"AD/LYC/110 Amdt 1","content":"## AD/LYC/110 Amdt 1","sortOrder":1},{"sectionNumber":"Crane / Lear Romec Rotary Fuel Pump Reli","sectionType":"part","heading":"Crane / Lear Romec Rotary Fuel Pump Relief Valve Attachment Screws","content":"## Crane / Lear Romec Rotary Fuel Pump Relief Valve Attachment Screws","sortOrder":2},{"sectionNumber":"3/2005","sectionType":"part","heading":"3/2005","content":"## 3/2005","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The amendment appears to refine inspection intervals (specifically clarifying the 55-hour/6-month cycle and the 10% tolerance issue mentioned in the background) rather than expand the scope beyond the original safety purpose of preventing fuel pump leaks. The applicability remains focused on the same engine and pump models."},"complexity_factors":["Multiple overlapping compliance timelines (10 hours/30 days initial, then 55 hours/6 months recurring)","Conditional termination clause (inspections stop only after two consecutive compliant checks)","Extensive parts cross-reference table with 15 different pump models and their manufacturer part numbers","Nested applicability exclusions (\"/M\" modified pumps exempt, but replacement with unmodified pumps resets the clock)","Reference to external technical document (Lycoming Service Bulletin 529B) for actual torque specifications","Dual-track compliance system (torque checks vs visual inspections with different intervals)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Lycoming aircraft engines to inspect and tighten screws on their fuel pumps to prevent dangerous fuel leaks.\n\n**Who it affects:**\n- Owners of aircraft with **Textron Lycoming piston engines** (models IO-320, IO-360, IO-540, and others listed)\n- Specifically those using **Crane/Lear Romec rotary fuel pumps** from the RG9080, RG9570, or RG17980 series\n\n**What you must do:**\n1. **Initial inspection:** Check the torque (tightness) of the relief valve screws within 10 flight hours or 30 days (whichever comes first)\n2. **Follow-up inspections:** Re-check the screws every 55 flight hours or 6 months until you've done two consecutive checks where the screws stay tight\n3. **Visual checks:** Look for fuel leaks or loose/missing screws around the relief valve area every 55 flight hours\n\n**Why it matters:**\nLoose screws on the fuel pump relief valve can cause fuel leaks, which could lead to **engine failure, engine fire, or loss of the aircraft**. This directive was issued after safety reviews showed the original inspection intervals needed tightening.\n\n**Good news:** If you replace your pump with a modified version (marked with \"/M\" after the part number), you're done — no more inspections needed."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"This amendment is technical and focused: it retains the original safety purpose (preventing fuel leaks from pump relief‑valve screws) and prescribes inspection and corrective action. The main change reported in the Background is an adjustment/clarification of inspection intervals (the 55‑hour interval note) following a review of an AD application. The amendment does not broaden the AD beyond that original, safety‑focused purpose; it refines timing and clarifies that installation of a \"/M\" modified pump is terminating action and that replacement with an unmodified pump re‑triggers inspections (Notes 1 and 3)."},"complexity_factors":["Applicability lists many engine models (multiple IO‑, TIO‑, GO‑, IGO‑, AEIO‑, LTIO‑, TIGO‑, IO‑720 and TIO‑720 variants)","Pump cross‑reference table lists approximately 15 pump model entries with corresponding Lycoming part numbers","External procedural dependency on Lycoming Service Bulletin SB 529B for inspection and torque specifications","Multiple timing conditions: initial deadline (10 hrs TIS or 30 days), recurrent intervals (55 hrs TIS or 6 months), and an 110‑hour conditional accumulation before a change in recurrence","Conditional terminating action (installation of \"/M\" modified pumps) and conditional re‑application on replacement with unmodified pumps","Cross‑reference to FAA AD 2003‑14‑03 (external regulatory material)"],"plain_english_summary":"This AD targets certain Lycoming piston engines fitted with specified Crane/Lear Romec rotary fuel pumps and requires initial and recurring torque checks and visual inspections of the pump relief‑valve screws per Lycoming SB 529B on a short, timed schedule; fitting a “/M” modified pump ends the inspection requirement. It affects aircraft owners/operators and maintenance organisations; intended to prevent relief‑valve fuel leaks that could lead to engine failure or fire, imposing inspection costs or the option to replace pumps to avoid recurring checks."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-lyc-110-amdt-1-crane-lear-romec-rotary-fuel-pump-relief-valve-attachment-screws","history":"/api/acts/ad-lyc-110-amdt-1-crane-lear-romec-rotary-fuel-pump-relief-valve-attachment-screws/history","analysis":"/api/acts/ad-lyc-110-amdt-1-crane-lear-romec-rotary-fuel-pump-relief-valve-attachment-screws/analysis","conflicts":"/api/acts/ad-lyc-110-amdt-1-crane-lear-romec-rotary-fuel-pump-relief-valve-attachment-screws/conflicts","importantCases":"/api/acts/ad-lyc-110-amdt-1-crane-lear-romec-rotary-fuel-pump-relief-valve-attachment-screws/important-cases","documents":"/api/acts/ad-lyc-110-amdt-1-crane-lear-romec-rotary-fuel-pump-relief-valve-attachment-screws/documents"}}