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Allison 250-C20 series

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Engine model · Turbo-prop · 420 hp · registry code 03020

Manufacturer (registry)
ALLISON
Model
250-C20 SER
Registry code
03020
Installed in
530 registered aircraft
Type
Turbo-prop
Power
420 hp
Data sheet
TCDSE4CE
Holder
Rolls-Royce Corporation

The registry names only the engine series, so ADs for every model in the series are matched.

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Airworthiness directives that may apply · 21

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

1972In forceSuperseded2026
See all 26 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 ('03020'))
  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 · 1

Engine · Allison 250-C20 series

SAIB CE-01-10Issued Jan 24, 2001
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 ('03020'))
  GROUP BY s.saib_number ORDER BY issue_date DESC"

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Registered aircraft · 530

N100LMHaddock Flying Service Inc · Salters, SCS/N 1583N101CHTri-State Vegetation Management LLC · Vevay, INS/N 1000829DN101MZBohonis David C · North DeltaNon-citizen corporation, flight hours not reportedBuilt 1980 · S/N 5045
See all 530 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 ('03020')
  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 · 372

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 103 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 239 cases with NTSB’s older coding, defined in its coding manual.

NTSB WPR26LA347Accident · No injuriesClass 3 · LimitedPreliminary reportBell 206B-III · Creswell, NCOn September 18, 2026, at 1018 eastern daylight time, a Bell 206B-III, N50141, was substantially damaged when it was involved in an accident near Creswell, North Carolina. The pilot was not injured. The helicopter was being operated as a Title 14 Code of…Sep 18, 2026 · N50141 · Substantial damageNTSB WPR26LA199Accident · Minor injuriesClass 4 · LimitedFinal reportBell 206-L4 · Cedar City, UTThe flight instructor's failure to maintain helicopter control while manipulating the engine governor reference rpm adjustment during hover operations, which resulted in a loss of control and impact with the ground.May 23, 2026 · N917SU · Substantial damageNTSB CEN24LA377Accident · No injuriesClass 4 · LimitedFinal reportMcdonnell Douglas Helicopter 369E · Manvel, TXThe pilot’s improper recovery from a practice autorotation which resulted in a hard landing. Contributing to the accident was the instructor’s inadequate supervision of the pilot receiving instruction.Sep 30, 2024 · N8372F · Substantial damage
See all 372 investigations
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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 ('03020')
  ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"

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FAA incident reports · 468

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

Accident 20260523009559ABell 206-L4 · Cedar City, UTA helicopter pilot instructor (who was sitting in the right seat) and student flying a Bell 206L-4, with registration number [privacy data omitted], were located at the kcdc (Cedar City) airport, south ramp. Intending to taxi to the helipad via taxiway…May 23, 2026 · N917SU · DestroyedIncident 20250928012199IBell Helicopter Textron 206L-1 · Tusayan, AZOn September 28, 2025, a Bell 206 aircraft, departed on an air tour flight where the left engine couling separated from the aircraft. No other damage occurred. Prior to the flight, the pilot conducted a preflight ispection which included removing the cloth…Sep 28, 2025 · N178PA · Minor damageAccident 20240930015339AMcdonnell Douglas Helicopter 369E · Manvel, TXDuring an evaluation/check-ride flight on 30 September 2024. The pilot under evaluation who was the PIC was at the controls performing a practice autorotation to a grass strip. The crew had performed several practice autorotations prior. The CFI announced…Sep 30, 2024 · N8372F · Substantial damage
See all 468 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 ('03020')
  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 · 945

SDR 2026FA0000472Lock Nut · failedMS20143 NUTS ARE UTILIZED TO SECURE WITHIN THE ENGINE ASSEMBLY THE FOLLOWING ARTICLES COMPRESSOR, TURBINE, FUEL CONTROL, GOVERNOR, FUEL PUMP, TACH GENERATORS, GEARBOX SPLIT LINE, AND HAVE BEEN FOUND NUMEROUS OCCASIONS BACKING OFF. THE MS21043 NUTS HAVE BEEN RMay 28, 2026 · N774CB · Hughes 369E · Engine (Turbine/Turboprop)SDR EVCA07192021Control Unit · malfunctionedRECENTLY INSTALLED SYSTEM TRUE BLUE BATTERY WAS GETTING A RED TEMP HOT CAUTION LIGHT FOR THE AIRCRAFT BATTERY WHEN THE STARTER BUTTON WAS PRESSED. THE BATTERY WOULD NOT PHYSICALLY BE HOT BUT THE TEMP LIGHT WOULD ILLUMINATE ABOVE 3% N1 AND EXTINGUISH BELOW 3% NJul 19, 2021 · N108AE · Bell 206L1 · Battery/Charger SystemSDR QMLA2020052820022Duct · looseDURING CRUISE FLIGHT, CREW AND PATIENT COMPLAINED OF CARBON MONOXIDE POISONING SYMPTOMS INCLUDING LIGHT HEADEDNESS, SLEEPINESS AND HEADACHE. HEATER WAS IN OFF POSITION, BOTH SWITCHES, BUT HEAT AND FUMES WERE COMING FROM HEATER VENT IN AFT COMPARTMENT OF AIRCRAMay 26, 2020 · N911AL · Bell 407 · Heating System
See all 945 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 = '250C20'
  ORDER BY difficulty_date DESC"

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STCs that may be installed · 8

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 SE2352NMModification of turbine engine.Fifty-Ten-Yankee LLC · Lists 250-C20SSTC SE5511NMInstallation of compressor discharge pressue (PC) valve.Bell Helicopter Textron Inc.STC SE769NWInstallation of Soloy Part No. 250-1001-1 fuel line.Siam Hiller Holdings IncSTC SE00014ENInstallation of the Pratt & Whitney Engine Services, Inc. CrossCheck Engine Monitor Kit P/N HUMS-K-071-1, Rev. A on the specified PT6A engine models and kit P/N HUMS-K-071-2 on the specified A250 engine models.Pratt & Whitney Engine Services Inc. · Lists 250-C20BSTC SE00027ENInstallation of Pratt & Whitney Engine Services Inc. Intellistart plus electronic control unit (ECU), P/N DPU-K-010 on the specified 250 engine models.Pratt & Whitney Engine Services Inc.STC SE492GLIncorporation of a fuel flow transducer.Shadin AvionicsSTC ST00037ATUnison igniter plugs, P/N 9044400-1.Unison IndustriesSTC SQ00338ATUnison igniter leads, P/N9048222-101, 102, 103, 104, 105, 106.Unison Industries
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 ('03020')
    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.