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Lycoming IO-540-K1B5

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Engine model · Reciprocating · 300 hp · registry codes 41665, 42718

Manufacturer (registry)
LYCOMING
Model
IO-540-K1B5
Registry codes
41665, 42718
Installed in
17 registered aircraft
Type
Reciprocating
Power
300 hp
Data sheet
TCDS1E4
Holder
Lycoming Engines

Model codes come from the FAA registry’s reference file. The FAA lists this model under more than one registry code, usually for different spellings of the maker. This page covers them all.

On this page

Airworthiness directives that may apply · 29

ADs whose products match this engine model. Each AD’s applicability may narrow it by serial number, part number or configuration.

1966In forceSuperseded2026
See all 40 ADs
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duckdb -csv -c "SELECT d.ad_number, d.status, d.subject, d.effective_date
  FROM 'https://openairdocs.org/data/latest/faa_directive.parquet' d
  WHERE d.ad_id IN (SELECT ad_id FROM 'https://openairdocs.org/data/latest/faa_engine_model_directive.parquet' WHERE engine_model_code IN ('41665', '42718'))
  ORDER BY coalesce(d.effective_date, d.publication_date, d.issue_date) DESC, d.ad_number DESC"

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Information bulletins that may apply · 6

Historical bulletins · 1
SAIB NE-08-32Propeller Governor Set ScrewIssued Jul 3, 2008
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duckdb -csv -c "SELECT s.saib_number, any_value(s.title) AS title, max(s.issue_date) AS issue_date, any_value(s.status) AS status
  FROM 'https://openairdocs.org/data/latest/faa_saib.parquet' s
  WHERE s.saib_id IN (SELECT saib_id FROM 'https://openairdocs.org/data/latest/faa_engine_model_saib.parquet' WHERE engine_model_code IN ('41665', '42718'))
  GROUP BY s.saib_number ORDER BY issue_date DESC"

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Registered aircraft · 17

N233GNeil Ryan · Bend, ORBuilt 2006 · S/N 00060023N31BPValiair Lc Trustee · Casper, WYBuilt 2006 · S/N 00060021N321VGGemmiti Vincent M Jr · Cabot, ARBuilt 1997 · S/N 16
See all 17 registered aircraft
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duckdb -csv -c "SELECT n_number, serial_number, year_manufactured, status, registrant_name, registrant_city, registrant_state
  FROM 'https://openairdocs.org/data/latest/faa_aircraft_registration.parquet'
  WHERE engine_model_code IN ('41665', '42718')
  ORDER BY n_number"

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NTSB investigations · 4

Aircraft matched to this engine model through the registry, by N-number and event date, checked against the reported serial number, make and model.

Defining event, 2008 on

Of 3 cases NTSB coded with a defining event. All defining events

In the probable cause, 2008 on

Findings NTSB made part of the probable cause. A case can have several. All findings

First occurrence, 1982 to 2007

Of 1 case with NTSB’s older coding, defined in its coding manual.

NTSB ANC26LA090Accident · No injuriesClass 4 · LimitedInvestigation openRepublic RC-3 · Evansville, INAug 24, 2026 · N463RK · Substantial damageNTSB WPR13FA022Accident · 2 fatalField investigationFinal reportBehne Glasair III · Byron, CAThe pilot's failure to maintain control of the airplane while maneuvering, which resulted in a stall and subsequent spin.Oct 23, 2012 · N655DB · DestroyedNTSB ANC10LA025Accident · Serious injuriesLimited investigationFinal reportBritten-Norman BN-2A-21 · Kodiak, AKThe pilot's failure to maintain clearance from rising terrain during takeoff resulting in collision with trees.Mar 15, 2010 · N663SA · Substantial damageNTSB MIA07LA066Accident · No injuriesLimited investigationFinal reportEADS PZL Warsza PZL-104M Wilga · Tampa, FLThe pilot's failure to maintain directional control during the landing roll which resulted in a ground loop and damage to the airplane.Mar 9, 2007 · N424HD · Substantial damage
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duckdb -csv -c "SELECT c.\"ntsbNumber\", c.\"eventDate\", c.\"eventType\", c.\"eventCity\", c.\"eventStateOrRegion\", a.n_number, a.\"aircraftMake\", a.\"aircraftModel\", c.\"highestInjuryLevel\", c.\"totalFatal\", c.\"completionStatus\", c.report_url
  FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c.\"mKey\" = a.case_mkey
  WHERE a.engine_model_code IN ('41665', '42718')
  ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

FAA incident reports · 6

Matched to this engine model through the registry, by N-number and event date, checked against the reported make and model.

Accident 20260824011849ARepublic RC-3 · Evansville, INOn August 24, 2026. At approximately 1056 eastern time, a Republic RC-3 seabee with an experimental research and development airworthiness certificate was performing a landing at Evansville Regional Airport, Indiana. On landing rollout the MLG collapsed and…Aug 24, 2026 · N463RK · Substantial damageIncident 20151206022929IEADS PZL Warszawa-Okecie PZL-104M Wilga 2000 · Rome, NYN923MW a PZL-104M wilga 2000, experienced a blown right main tire upon landing rwy 15 at the griffiss international airport. The aircraft's right wingtip and tail section struck the ground. The aircraft apparently came to rest around taxiway bravo. PIC Dr.…Dec 6, 2015 · N923MW · Minor damageIncident 20140307001309IPilatus Britten-Norman BN2B-20 · Virgin GordaDuring taxi from ramp parking the aircraft struck a fence, incurring minor damage to the right wing tip.Mar 7, 2014 · N530BN · Minor damageAccident 20121023024599ABehne David S Glasair III · Brentwood, CAAn experimental amateur built Glasair III was destroyed by impacted with plowed field. The private pilot owner and his private pilot rated passenger were fatally injured. Aircraft was flying 3 miles south of Funny farm private airport (ACA2). At approximately…Oct 23, 2012 · N655DB · Destroyed · 2 fatalAccident 20100315029589ABritten-Nor BN-2A-21 · Kodiak, AKPilot contacted Kodiak ground control and requested taxi from ramp to intersection of runway 25 and runway 29 at the Kodiak airport (padq). Ground control advised the pilot wind was 290 at 17 gusting 25 knots. Pilot requested from Kodiak tower a departure…Mar 15, 2010 · N663SA · Substantial damageAccident 20070309005739AEadsnv PZL104M2000 · Tampa, FL(-23) On March 9, 2007, at 1711 EST, a wilga PZL-104M, registered to island century media LLC, experienced a ground loop and collapse of its right main landing gear upon landing at the Peter o. Knight airport, Tampa, Florida after a local part 91 flight.…Mar 9, 2007 · N424HD · Substantial damage
Query with SQL
duckdb -csv -c "SELECT report_number, event_date, event_type, city, state, aircraft_make, aircraft_model, aircraft_damage, fatal_injuries, n_number
  FROM 'https://openairdocs.org/data/latest/faa_incident_report.parquet'
  WHERE engine_model_code IN ('41665', '42718')
  ORDER BY event_date DESC, report_number DESC"

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Service difficulty reports · 100

SDR HYIA20260508001Exhaust Pipe · brokenDURING PREFLIGHT THE PILOT NOTED THAT AN EXHAUST PIPE ON THE RIGHT ENGINE WAS CRACKED, WHICH CAUSED DAMAGE TO THE ENGINE COWLING. MAINTENANCE REPLACED THE RIGHT ENGINE CROSSOVER EXHAUST PIPE AND REPAIRED THE ENGINE COWLING WITH NO FURTHER DEFECTS NOTED.May 3, 2026 · N540BN · Bnorm BN2B20 · Engine Collector/Tailpipe/NozzleSDR 2023F00282Wire · brokenRIGHT HAND MAGNETO OFF LIGHT ILLUMINATED ON RIGHT HAND MVP-50P ENGINE INSTRUMENT DISPLAY. PILOT RETURNED TO AIRPORT, LANDED NORMALLY. MAINTENANCE DISCOVERED BROKEN WIRE AT RPM SENSOR AT RIGHT HAND ENGINE RIGHT HAND MAGNETO. (MAGNETO STILL OPERATED NORMALLY)Sep 16, 2023 · N801SA · Bnorm BN2B21 · Ignition System WiringSDR HYIA20211105001None · noneTHE PILOT REPORTED DURING CRUISE THE RIGHT ENGINE RPM AND OIL PRESSURE NOTICEABLE GOING DOWN, WITH THE ENGINE GOING INTO A FEATHER. THE PILOT ELECTED TO SHUT DOWN THE ENGINE, RESULTING IN A SINGLE-ENGINE LANDING. MAINTENANCE INSPECTED AND FOUND THE CRANKSHAFNov 3, 2021 · N510BN · Bnorm BN2B20 · Engine (Turbine/Turboprop)
See all 100 difficulty reports
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duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE engine_model_key = 'IO540K1B5'
  ORDER BY difficulty_date DESC"

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STCs that may be installed · 44

Approved for this engine model: the STC’s model list names it on its data sheet, or a series that includes it. The registry doesn’t record which STCs an aircraft has.

STC SE00825WIInstallation of Specialty Products Spin-on oil filter on Lycoming Engines.B & C Specialty Products Inc.STC SE04349CHInstallation of SureFly electronic ignitionSureFly Partners Ltd.STC SE01954SEInstallation of engine crankcase seal.Ly-Con Rebuilding Company
See all 44 STCs
Query with SQL
duckdb -csv -c "SELECT s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model
  FROM (
    SELECT stc_number, min(matched_model) AS matched_model
    FROM 'https://openairdocs.org/data/latest/faa_engine_model_stc.parquet'
    WHERE engine_model_code IN ('41665', '42718')
    GROUP BY stc_number
  ) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number)
  ORDER BY s.status = 'Current' DESC, s.status_date DESC, s.stc_number"

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PMA parts · 1,000+

Current parts manufacturer approvals (PMA): parts the FAA has approved companies to make as replacements or modifications. Each record lists its models as free text; OpenAirDocs matched them to this engine model on its data sheet, so check the FAA record before relying on it. Newest first.

ES66M19385Clamp, MagnetoHartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 66M19385 · Nov 10, 2025ES10-400567Bearing, BallHartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-400567 · Nov 10, 2025ES10-349249Washer, BowedHartzell Engine Technologies LLC · PMA PQ1383CE · Replaces 10-349249 · Nov 10, 2025
See all 1,000+ PMA parts
Query with SQL
duckdb -csv -c "SELECT drs_guid, part_number, part_name, holder, pma_number, replaces_part, supplement_date, tcds_models
  FROM 'https://openairdocs.org/data/latest/faa_type_certificate_pma.parquet'
  WHERE tcds_number IN ('1E4')
    AND len(list_intersect(tcds_models, ['IO-540-K1B5'])) > 0
  ORDER BY supplement_date DESC, drs_guid DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.