Lycoming
(https://lycoming.com) 📸 Data Snapshot: May 31, 2026
Semantic Coherence — The Lens
Pull the main entities out of the H1, then check whether they actually recur through the body. A page that announces one thing and then talks about another drifts. Headings with no real sentences underneath read as pseudo-substance.
Semantic Coherence
Homepage promise vs. Sub-page reality.
19
Impact Weight: 20 / 100
95% Reputation
There is virtually zero semantic drift between the homepage signal and sub-page substance. The homepage H6 headings list the LYCOMING ENGINE PORTFOLIO (235 Series, 360 Series, etc.), and the Engine Finder sub-page delivers exact specifications for those series, including HP ratings and voltage. The promise of LEGENDARY RELIABILITY is supported by a live, recently updated Technical Publications database featuring documentation from May 2026.
Semantic Coherence is read from the heading hierarchy first: what each page announces in its H1 and headings, then whether the body actually delivers on it. Below is the structure the engine mapped, followed by the clean text to check for drift between promise and reality.
🏗️ Semantic Structure — heading hierarchy & page identity (the promise the page makes)
HOMEPAGE Homepage | Lycoming (https://lycoming.com)
Title
Homepage | Lycoming
H1 THE BRAIN POWER BEHIND GENERAL AVIATION
H2 Utility
H2 User account menu
H2 Main navigation
H2 Main navigation
H2 Utility
H2 User account menu
H2 Footer
H2 Follow Us
H2 Dependable power wherever you fly.
H2 LEGENDARY RELIABILITY SINCE 1929
H2 Building every engine as if we will fly it ourselves.
H2 MEET JIM WRIGHT
H2 Footer menu
H2 Follow Us
H2 Footer Utility
H4 REBUILT ENGINES
H4 OVERHAULED ENGINES
H4 Product Support Network
H4 ADVANCED TECHNOLOGY
H4 Exceptional quality goes beyond our engines.
H4 Be the first to know what's new, in the air and on the ground. Sign-up for the Lycoming Flyer E-Newsletter.
H5 You are flying with the greatest
H5 PISTON ENGINE INNOVATOR
H5 GENERAL AVIATION LEADER
H5 AWARD-WINNING MANUFACTURER
H6 LYCOMING ENGINE PORTFOLIO
H6 235 Series
H6 320 Series
H6 360 Series
H6 390 Series
H6 540 Series
H6 580 Series
H6 720 Series
NAV_HEADER_HEADING_REPEATED_BODY Engine Finder | Lycoming (https://lycoming.com/engine-finder-search/)
Title
Engine Finder | Lycoming
H1 Engine Finder
H2 Utility
H2 User account menu
H2 Main navigation
H2 Main navigation
H2 Utility
H2 User account menu
H2 Footer
H2 Follow Us
H2 Footer menu
H2 Follow Us
H2 Footer Utility
H4 O-360-A1D
H4 O-360-A4M
H4 IO-540-K1G5
H4 TIO-540-AK1A
H4 TIO-540-AJ1A
H4 IO-540-D4B5
H4 O-360-A4M
H4 TIO-540-AK1A
H4 TIO-540-AJ1A
H4 O-360-A1D
H4 AEIO-540-L1D5
H4 TIO-540-J2B
H4 Pagination
H5 Part # 8313
H5 Part # 9451
H5 Part # 8426
H5 Part # 10439
H5 Part # 10658
H5 Part # 10394
H5 Part # 8928
H5 Part # 10385
H5 Part # 10539
H5 Part # 8939
H5 Part # 10088
H5 Part # 8945
NAV_HEADER_HEADING_REPEATED Technical Publications | Lycoming (https://lycoming.com/contact/knowledge-base/publications/)
Title
Technical Publications | Lycoming
H1 Technical Publications
H2 Utility
H2 User account menu
H2 Main navigation
H2 Main navigation
H2 Utility
H2 User account menu
H2 Footer
H2 Follow Us
H2 Utility
H2 Footer menu
H2 Follow Us
H2 Footer Utility
H4 Pagination
H5 Service Instruction No. 1154 AA
H5 Service Bulletin No. 668
H5 CC363i/CC363i-FP Illustrated Parts Catalog Rev. 1
H5 TEO-540-C1A Engine Illustrated Parts Catalog Rev. 7
H5 Service Instruction No. 1125 E
H5 Service Instruction No. 1595
H5 Service Letter No. 303 A
H5 Service Instruction No. 1597
H5 Service Bulletin No. 640
H5 IO-360-B4A Illustrated Parts Catalog Rev. 1
H5 TIO-540-AK1A Illustrated Parts Catalog Rev. 1
H5 Service Bulletin No. 667 A
H5 Service Instruction No. 1575 A
H5 Service Instruction No. 1366 B
H5 Service Instruction No. 1014 P
H5 Service Bulletin No. 665
H5 Service Bulletin No. 533 D
H5 Service Instruction No. 1042 AI
H5 iE2 Series EECS Engine Wiring Harness Inspection and Repair Manual
H5 TEO-540-C1A Engine Installation & Operations Manual Rev 5
NAV_HEADER_HEADING_REPEATED_BODY Distributors | Lycoming (https://lycoming.com/distributors/)
Title
Distributors | Lycoming
H1 Find a Distributor
H2 Utility
H2 User account menu
H2 Main navigation
H2 Main navigation
H2 Utility
H2 User account menu
H2 Footer
H2 Follow Us
H2 Footer menu
H2 Follow Us
H2 Footer Utility
📝 The Narrative — clean text per page (homepage promise vs. sub-page reality)
HOMEPAGE (https://lycoming.com) Homepage | Lycoming
[H1] THE BRAIN POWER BEHIND GENERAL AVIATION [IMG: hero] [H6] LYCOMING ENGINE PORTFOLIO [IMG: 235 Engine] View Engine [H6] 235 Series [IMG: 320 Engine] View Engine [H6] 320 Series [IMG: 360 Series Engine] View Engine [H6] 360 Series [IMG: 390 Series Engine] View Engine [H6] 390 Series [IMG: 540 Series Engine] View Engine [H6] 540 Series [IMG: 580 Series Engine] View Engine [H6] 580 Series [IMG: 720 Series Engine] View Engine [H6] 720 Series [H5] You are flying with the greatest Find Your Engine [H2] Dependable power wherever you fly. [IMG: rebuilt_engine] [H4] REBUILT ENGINES FAA-certified to zero-time status. [IMG: overhauled_engine] [H4] OVERHAULED ENGINES Restored to factory standards. [IMG: Product Support] [H4] Product Support Network Global customer support and care. [IMG: advanced_tech] [H4] ADVANCED TECHNOLOGY Innovating new flying experiences. [H2] LEGENDARY RELIABILITY SINCE 1929 Learn About Our History [IMG: Black and white photo of a man working on an engine] [H5] PISTON ENGINE INNOVATOR 90+ Years [H5] GENERAL AVIATION LEADER 1 MIL FLIGHT HOURS MONTHLY [H5] AWARD-WINNING MANUFACTURER 200K ACTIVE ENGINES [IMG: Jim Wright] [H2] Building every engine as if we will fly it ourselves. [H2] MEET JIM WRIGHT Read Their Story [H4] Exceptional quality goes beyond our engines. Find a Distributor Support [H4] Be the first to know what's new, in the air and on the ground. Sign-up for the Lycoming Flyer E-Newsletter.
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SUB-PAGE (https://lycoming.com/engine-finder-search/) Engine Finder | Lycoming
[H1] Engine Finder [H4] O-360-A1D [H5] Part # 8313 A/C ModelM-20 SERIESA/C TypeA/C mfgMOONEYHP180Voltage12view [H4] O-360-A4M [H5] Part # 9451 A/C ModelA/C TypeCONVERSIONA/C mfgPENN YANHP180Voltage12view [H4] IO-540-K1G5 [H5] Part # 8426 A/C ModelA/C TypeA/C mfgPIPERHP300Voltage12view [H4] TIO-540-AK1A [H5] Part # 10439 A/C ModelT-182A/C TypeA/C mfgCESSNAHP235Voltage24view [H4] TIO-540-AJ1A [H5] Part # 10658 A/C ModelT-206A/C TypeSTATIONAIR, TURBOA/C mfgCESSNAHP310Voltage24view [H4] IO-540-D4B5 [H5] Part # 10394 A/C Model182A/C TypeA/C mfgCESSNAHP250Voltage24view [H4] O-360-A4M [H5] Part # 8928 A/C ModelA/C TypeCONVERSIONA/C mfgPENN YANHP180Voltageview [H4] TIO-540-AK1A [H5] Part # 10385 A/C ModelT-182A/C TypeA/C mfgCESSNAHP235Voltage24view [H4] TIO-540-AJ1A [H5] Part # 10539 A/C ModelT-206A/C TypeSTATIONAIR, TURBOA/C mfgCESSNAHP310Voltage24view [H4] O-360-A1D [H5] Part # 8939 A/C ModelPA-23A/C TypeA/C mfgPIPERHP180Voltageview [H4] AEIO-540-L1D5 [H5] Part # 10088 A/C ModelCAPA/C TypeAPEX AircraftA/C mfgCESSNAHP300Voltage12view [H4] TIO-540-J2B [H5] Part # 8945 A/C ModelPA-31-350A/C TypeT-1020A/C mfgPIPERHP350Voltage24view
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SUB-PAGE (https://lycoming.com/contact/knowledge-base/publications/) Technical Publications | Lycoming
[H1] Technical Publications Sign up to receive an email notification when Lycoming publishes a technical publication on our website. Service Instructions | 05.18.26 [H5] Service Instruction No. 1154 AA FAA-Approved Starters and Alternators Service Bulletins | 05.18.26 [H5] Service Bulletin No. 668 Parts Catalog | 05.14.26 [H5] CC363i/CC363i-FP Illustrated Parts Catalog Rev. 1 Parts Catalog | 05.14.26 [H5] TEO-540-C1A Engine Illustrated Parts Catalog Rev. 7 Service Instructions | 05.14.26 [H5] Service Instruction No. 1125 E Service Instructions | 05.14.26 [H5] Service Instruction No. 1595 Service Letters | 05.14.26 [H5] Service Letter No. 303 A Service Instructions | 05.14.26 [H5] Service Instruction No. 1597 Service Bulletins | 05.14.26 [H5] Service Bulletin No. 640 Starter Wire Contact with Fuel Servo Parts Catalog | 03.18.26 [H5] IO-360-B4A Illustrated Parts Catalog Rev. 1 PC-IO-360-B4A Parts Catalog | 03.18.26 [H5] TIO-540-AK1A Illustrated Parts Catalog Rev. 1 PC-TIO-540-AK1A Service Bulletins | 03.12.26 [H5] Service Bulletin No. 667 A Service Instructions | 02.10.26 [H5] Service Instruction No. 1575 A New Connecting Rod Bushing Service Instructions | 02.10.26 [H5] Service Instruction No. 1366 B Repair Procedure for Worn Rocker Shaft Bushing Hole Service Instructions | 02.10.26 [H5] Service Instruction No. 1014 P Lubricating Oil Recommendations Service Bulletins | 02.10.26 [H5] Service Bulletin No. 665 Heat Shield Removal Service Bulletins | 02.10.26 [H5] Service Bulletin No. 533 D Recommended Action for Sudden Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller/Rotor Blade or Tip Service Instructions | 01.28.26 [H5] Service Instruction No. 1042 AI APPROVED SPARK PLUGS Maintenance Manuals | 01.15.26 [H5] iE2 Series EECS Engine Wiring Harness Inspection and Repair Manual Lycoming Part Number: IRM-iE2 Installation & Operator Manuals | 01.15.26 [H5] TEO-540-C1A Engine Installation & Operations Manual Rev 5 DOCUMENT PART NO. IOM-TEO-540-C1A REV 5
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SUB-PAGE · THIN (https://lycoming.com/distributors/) Distributors | Lycoming
[H1] Find a Distributor FIND AN AUTHORIZED LYCOMING DISTRIBUTOR NEAR YOU Through our worldwide network of knowledgeable Lycoming Distributors, you’ll receive the Lycoming-approved attention you deserve. Contact distributors at your earliest interest for purchase, delivery, and installation support.
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Explore the other reputation pillars for Lycoming
Analysis Disclosure & Source Attribution
This page presents a snapshot of public data from Lycoming, captured on May 31, 2026, to show how machine logic reads Semantic Coherence signals into an AI reputation evaluation.
Purpose: This data is presented under “Fair Use” for the purpose of independent signal analysis, allowing readers to see the raw signals behind the reputation score.
Notice to Lycoming: This analysis is part of a non-adversarial audit conducted by 1 Euro SEO. The results are intended as professional feedback to help improve any website’s machine-readability and authority signals. The evaluation is free, and any company can request a fresh audit at any time.
Any company can use the insights for free and improve its voice. When a company has updated its content, it can always submit a new audit request, which will be reflected in a new current score.
To all users: You are encouraged to visit the live site at https://lycoming.com to view the most current version of its content and see directly what this company is about and what it offers.