OpenAirDocs.org

Lycoming IO-540-K1A5

Open the Markdown

Engine model · Reciprocating · 300 hp · registry code 41663

Manufacturer (registry)
LYCOMING
Model
IO-540-K1A5
Registry code
41663
Installed in
44 registered aircraft
Type
Reciprocating
Power
300 hp
Data sheet
TCDS1E4
Holder
Lycoming Engines

Model codes come from the FAA registry’s reference file.

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
Query with SQL
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 ('41663'))
  ORDER BY coalesce(d.effective_date, d.publication_date, d.issue_date) DESC, d.ad_number 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.

Information bulletins that may apply · 6

Historical bulletins · 1
SAIB NE-08-32Propeller Governor Set ScrewIssued Jul 3, 2008
Query with SQL
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 ('41663'))
  GROUP BY s.saib_number ORDER BY issue_date 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.

Registered aircraft · 44

N104DPMajul Enterprises Inc · Saint Petersburg, FLS/N 3340N1064GAnding Jay B · Bryan, TXBuilt 1979 · S/N 5007N143DWCardinal Aviation LLC · Towson, MDBuilt 1974 · S/N 32-7440164
See all 44 registered aircraft
Query with SQL
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 ('41663')
  ORDER BY n_number"

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.

NTSB investigations · 8

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 6 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 ANC25LA021Accident · Minor injuriesClass 3 · LimitedFinal reportGippsland GA-8 · Lihue, HIThe failure of the right landing gear leg due to a fatigue crack, which resulted in its separation from the airplane during taxi. Contributing to the accident, was the mechanic’s inadequate inspection of the landing gear leg during the last maintenance…Feb 28, 2025 · N699AV · Substantial damageNTSB WPR22LA204Accident · No injuriesClass 3 · LimitedFinal reportPiper PA-32-300 · Snohomish, WAThe total loss of engine power during takeoff due to fuel starvation and the pilot’s improper fuel tank selection and inadequate preflight inspection.Jun 4, 2022 · N561PK · Substantial damageNTSB GAA19CA239Accident · No injuriesData collectionFinal reportGippsland GA8 · Bethel, AKThe pilot's failure to maintain adequate clearance from a shipping container while taxiing.May 2, 2019 · N524AV · Substantial damageNTSB GAA18CA368Accident · No injuriesData collectionFinal reportPiper PA 32-300 · Columbia, SCThe pilot's failure to maintain directional control during landing.Jun 18, 2018 · N41AL · Substantial damageNTSB CEN14LA504Accident · 2 fatalLimited investigationFinal reportSaccio Thomas A Seawind 3000 · Bloomington, INAn in-flight fire for reasons that could not be determined because the examination of the airplane did not reveal the source of the fire.Sep 18, 2014 · N516SW · DestroyedNTSB CEN12LA543Accident · Serious injuriesLimited investigationFinal reportCross David L Glasair III · Westcliffe, COThe loss of oil pressure due to the failure of an oil filter gasket, which resulted in a total loss of engine power.Aug 7, 2012 · N71AJ · Substantial damageNTSB MIA94LA017Accident · No injuriesLimited investigationFinal reportPiper PA-32-300 · Plymouth, FLTotal failure of the crankshaft due to fatigue resulting in a forced landing and subsequent hard landing.Nov 7, 1993 · N9000M · Substantial damageNTSB MKC76DTK10Accident · No injuriesClosedPiper PA-32 · Flandreau, SDOct 14, 1975 · N5216S · Substantial damage
Query with SQL
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 ('41663')
  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 · 18

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

Incident 20260228001549IGippsland GA-8 · Bethel, AKThe aircraft cargo door unlatched and opened in cruise flight. A passenger attempted to close the door but was unable to. The flight continued at cruise speed and the door separated from the aircraft after the center rail bent up to allow the door to slide…Feb 28, 2026 · N578GV · Minor damageIncident 20250608009419IPiper PA-32-300 · Pierre, SDOn June 8, 2025, at 12:00 a PA-32-300, [privacy data omitted], was involved in an incident during takeoff rotation when the aircraft returned to the ground and struck serval runway lights. Strong and gusting winds prevailed, and VFR flight plan was filed. The…Jun 8, 2025 · N5216S · Minor damageAccident 20250228002379AGippsland GA-8 · Lihue, HIAircraft completed flight and landed on runway 21R before turning onto taxiway where it's RH main landing gear collapsed. Aircraft was shutdown and evacuated before being moved to company hangar with NTSB permission. Investigation into the root cause of…Feb 28, 2025 · N699AV · Substantial damage
See all 18 incident reports
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 ('41663')
  ORDER BY event_date DESC, report_number 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.

Service difficulty reports · 167

SDR 1SMA20260615001Brake · burnedDURING TAXI FOLLOWING CONSECUTIVE REJECTED TAKEOFFS, THE AIRCRAFT EXPERIENCED A LANDING GEAR BRAKE FIRE. INVESTIGATION REVEALED THAT THE HEAT GENERATED BY THE CONSECUTIVE ABORTS CAUSED THE CALIPER HYDRAULIC SEAL (P/N: MS28775-222 O-RING) TO MELT AND FAIL. THISJun 15, 2026 · N4599X · Piper PA32300 · Landing Gear Brake SystemSDR 2026FA0000157Dowel Pin · shearedTHE MAGNETO IMPULSE COUPLER LOCKED UP AND BROKE THE GEARS INSIDE THE BACK OF THE ENGINE. THIS SHEARED THE DOWEL PIN IN THE BACK OF THE CRANKSHAFT CAUSING ENGINE STOPPAGE.Mar 4, 2026 · N4181W · Piper PA32300 · Magneto/DistributorSDR 2025FA0000541Oil Filter · out of alignmentTEMPEST OIL FILTER FOUND DEFECTIVE AT INSPECTION. NEW OIL FILTER HAS A MANUFACTURING DEFECT. THE MOUNT THREADS ARE NOT TRUE TO CENTERLINE OF THE FILTER. THIS IS A SPIN ON OIL FILTER. WHEN INSTALLING IT IS EASY TO SEE THAT IT IS NOT TRUE SO IT WOBBLES WHILEAug 11, 2025 · Gippld GA8 · Reciprocating Engine Oil System
See all 167 difficulty reports
Query with SQL
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 = 'IO540K1A5'
  ORDER BY difficulty_date 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.

STCs that may be installed · 45

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 45 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 ('41663')
    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"

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.

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-K1A5'])) > 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.