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Lycoming TIO-540-U2A

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Engine model · Reciprocating · 350 hp · registry code 41990

Manufacturer (registry)
LYCOMING
Model
TIO-540-U2A
Registry code
41990
Installed in
3 registered aircraft
Type
Reciprocating
Power
350 hp
Data sheet
TCDSE14EA
Holder
Lycoming Engines

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

On this page

Airworthiness directives that may apply · 16

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

1983In forceSuperseded2026
See all 30 ADs
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  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 ('41990'))
  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 · 5

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 ('41990'))
  GROUP BY s.saib_number ORDER BY issue_date DESC"

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Registered aircraft · 3

N201WFSky West Aviation Inc Trustee · Albuquerque, NMBuilt 1984 · S/N 608423010N696MEBgdr LLC · Wilmington, DES/N 61P-0209-020N824MZMaritz Paul · Mercer Island, WABuilt 1981 · S/N 61P08518163449
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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 ('41990')
  ORDER BY n_number"

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NTSB investigations

No NTSB investigations matched to aircraft with this engine modelMatched through the registry by N-number, so foreign aircraft and some older cases aren’t counted.

FAA incident reports · 1

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

Incident 20170416006379IPiper Aerostar 601P · Everett, WAOn 4/16/2017 around 1500 local N824MZ took off from bfi. Shortly after take off the pilot noticed his auto pilot failed, and the rest of his avionics continued to fail. The pilot was able to make it to pae, but failed to attempt to put his lading gear down.…Apr 16, 2017 · N824MZ · Minor damage
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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 ('41990')
  ORDER BY event_date DESC, report_number DESC"

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Service difficulty reports · 8

SDR 2012FA0000302Valve Spring · brokenNOTICED MANIFOLD PRESSURE SPLITS ON LEFT ENGINE, AND A COLD RUNNING NR 3 CYLINDER, INSPECTED AND FOUND INNER AND OUTER EXHAUST VALVE SPRINGS BROKEN. REPLACED BOTH SPRINGS. SUBSEQUENT FLIGHT, LT ENGINE OK, BUT NOTICED AN OCCASIONALLY MISS AND COOLER RUNNING NMar 27, 2012 · N6077T · Piper PA60601P · Reciprocating Engine Cylinder SectionSDR 2012FA0000303Valve Spring · brokenLT ENGINE, AFTER NOTICING MANIFOLD PRESSURE SPLITS, AND A COLD RUNING NR 3 CYLINDER, INSPECTED AND FOUND INNER AND OUTER EXHAUST VALVE SPRINGS BROKEN. REPLACED BOTH SPRINGS. SUBSEQUENT FLIGHT, LT ENGINE OK, BUT NOTICED AN OCCASIONALLY MISS AND COOLER RUNNINGMar 27, 2012 · N6077T · Piper PA60601P · Reciprocating Engine Cylinder SectionSDR CA101122016Bellows · detached(CAN) DURING CRUISE FLIGHT, RT ENGINE LOST POWER. PILOT ELECTED TO RETURN TO AIRPORT OF DEPARTURE (WINDSOR AIRPORT). PILOT CONDUCTED A POST FLIGHT RUN UP AND ONLY ACHIEVED 33 IN MAP. THE INTAKE, TURBO CHARGER AND TURBO CONTROL SYSTEM WAS INSPECTED FOR OBVIONov 18, 2010 · Piper PA60601P · Engine Air Intake SystemSDR 2005FA0001295Valve Guide · burnedDURING ANNUAL INSPECTION, IT WAS DISCOVERED DURING A DIFFERENTIAL COMPRESSION CHECK THAT NR 1CYLINDER ON THIS ENGINE HAD ALMOST NO COMPRESSION. THE CYLINDER WAS REMOVED AND SENT, IT WAS DISCOVERED THAT THE EXHAUST VALVE GUIDE WAS BAD. THE GUIDE WAS REPLACED ALSep 9, 2005 · Piper PA60602P · Reciprocating Engine Cylinder SectionSDR 2005FA0001296Valve Guide · burnedDURING ANNUAL INSPECTION, IT WAS DISCOVERED DURING A DIFFERENTIAL COMPRESSION CHECK THAT THE NR 1 CYLINDER ON THIS ENGINE HAD ALMOST NO COMPRESSION. THE CYLINDER WAS REMOVED AND SENT AND WAS DISCOVERED THAT THE EXHAUST VALVE GUIDE WAS BAD. THE GUIDE WAS REPLACSep 9, 2005 · N700WG · Piper PA60602P · Reciprocating Engine Cylinder SectionSDR 021081Crankcase · crackedON 28 DEC 2002, AEROSTAR N6902T LANDED AT OAJ WITH NR 2 (RT) ENGINE SHUTDOWN AND PROPELLERS FEATHERED. THE PILOT STATED THAT DURING FLIGHT, HE NOTICED A DROP IN OIL PRESSURE AND SHUTDOWN THE ENGINE. PRIOR TO SHUTDOWN, THE PILOT STATED THAT ALL OTHER INDICATIJan 9, 2003 · N6902T · Piper PA60602P · Reciprocating Engine Power SectionSDR 97ZZZX3789Washer · wornDURING C/W SB 600-131, SUBSTANTIATED BOTH SCAVANGE OIL PUMPS WERE DUE IMMINENT FAILURE. REPLACED PARTS REQUIRED.May 15, 1997 · N858CH · Piper PA60602P · Reciprocating Engine Oil SystemSDR 95ZZZX774Turbocharger · oil leakDURING ANNUAL INSPECTION, CENTER SECTION OF TURBO LEAKING OIL. REMOVED FITTINGS, FOUND SEVERAL CHUNKS OF METAL INSIDE CENTER SECTION. NO EVIDENCE OF METAL CONTAMINATION IN OIL FILTER OR ENGINE SCAVENGE PUMP. TURBO REPLACED. NOTE: OIL WAS LEAKING INTO INDUFeb 8, 1995 · N6067Y · Piper PA60601P · Exhaust Turbocharger
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  WHERE engine_model_key = 'TIO540U2A'
  ORDER BY difficulty_date DESC"

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STCs that may be installed · 29

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 29 STCs
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  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 ('41990')
    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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