Engine model · Turbo-shaft · 450 hp · registry code 03091

Manufacturer (registry)
ALLISON
Model
250-C20R/1
Registry code
03091
Type
Turbo-shaft
Power
450 hp
Data sheet
TCDSE4CE
Holder
Rolls-Royce Corporation

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

On this page

Airworthiness directives that may apply · 10

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

1977In forceSuperseded2026
ADs by the year they took effect: 13 ADs
19771
19821
19891
19961
19991
20011
20051
20062
20151
20171
20181
20221
Superseded and historical ADs · 4
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 ('03091'))
  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.

Registered aircraft · 3

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 ('03091')
  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

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

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

Service difficulty reports · 13

SDR E7L2010F00000Engine · flamed outACFT HAD NR 2 ENGINE FLAME OUT. INSPECTED ACFT AND FOUND NO DISCREPANCIES. BLEED FUEL SYS. PERFORMED ENG POWER CK AND 20 MINUTE HOVER TEST FLIGHT WITH SATISFACTORY RESULTS.Jun 24, 2010 · N35SK · Agusta A109 · Engine (Turbine/Turboprop)SDR 2009F00026Compressor Wheel · damagedPILOT REPORTED NR 1 ENG LOW WARNING LIGHT AND NR 1 ENG LOW AURAL ACTIVATED WITH CORRESPONDING DECREASE IN ENG SOUND. NR 1 ENG N1 WAS AT 28 PERCENT AND TOT WAS RISING, REACHING APPROX 1000 DEGREES C. PROCEEDED TO PULL NR 1 ENG THROTTLE TO IDLE AND THEN TO OFF. Apr 7, 2009 · N70NM · Agusta A109C · Turbine Engine Compressor SectionSDR CA060214006Washer · missing(CAN) AS ENG NR 2 WAS INCREASED, EXCEEDANCE ON INSTR PANEL, M/R READING HIGH ON TRIPLE TACH, NO INDICATION OF N2 SPEED ON TACH INDICATOR. FOUND N2 GOV GEAR FREEWHEELING, DISENGAGED FROM INTERNAL GB N2 DRV SYS. TEARDOWN OF GB REVEALED BRG RETAINING WASHER WASFeb 10, 2006 · Aerosp AS355* · Turbine Engine Accessory DriveSDR AHE02062Connector · disconnectedNR 1 ENGINE LOW WARNING ILLUMINATED IN FLIGHT. NG DROPPED AND FLICKERED BEFORE BECOMING ZERO. ENGINE RETARDED TO GROUND IDLE, ALL OTHER INDICATIONS NORMAL. AIRCRAFT LANDED NORMALLY ON ONE ENGINE. NR 1 ENGINE NG TACHOMETER ELECTRICAL CONNECTOR FOUND DETACHESep 4, 2002 · N109TW · Agusta A109C · Engine RPM Indicating SystemSDR AU991049Diaphragm · failed(AUS) GAS PRODUCER TURBINE SECOND STAGE NOZZLE DIAPHRAGM FAILED AND RUBBING ON THE FIST AND SECOND STAGE TURBINE WHEELS.Oct 18, 1999 · Hughes 369E · Turbine SectionSDR CA990915038Impeller · cracked(CAN) ENGINE OIL COOLER/BLOWER ASSY DISASSEMBLED AT CUSTOMER'S REQUEST. IMPELLER WAS FOUND CRACKED (1/2) DURING FPI INSPECTION. MANUAL SPECIFIES THAT FPI IS CARRIED OUT EVERY 300 HOURS, HOWEVER, THIS CRACK WAS FOUND IN AN AREA NOT SPECIFIED IN THE BELL MANUAAug 27, 1999 · Bell 206B · Engine Oil CoolerSDR AU990913Actuator · cracked(AUS) HYDRAULIC SERVO ACTUATOR LOCATED ON THE LEFT SIDE OF THE GEARBOX CRACKED ON THE UPPER BODY. LOSS OF NR 2 HYDRAULIC SYSTEM FLUID.Aug 11, 1999 · Agusta A109C · Rotorcraft Servo SystemSDR 99ZZZX2341Nozzle · crackedDIAPHRAGM CRACKED JUST UNDER INNER RIM, JUST OVER 2 INCHES LONG, AND LEFT VANE FILLET CRACKED AND BURNED.May 27, 1999 · Fuel Injector NozzleSDR 99ZZZX2342Nozzle · crackedINNER AND OUTER BAND CRACKS, SADDLE CRACKS, MANY VANE TRAILING EDGE CRACKS, MULTIPLE IN SAME VANE, SOME OVER .3750 INCH LONG.May 27, 1999 · Fuel Injector NozzleSDR 99ZZZX2343Shaft · corrodedPOWER TURBINE OUTER SHAFT HAS SEVERE DEEP CORROSION AT DIMPLES AND CURVIC COUPLING. CORROSION AT DIMPLES 360 DEGREES AROUND AND OVER HALF AS DEEP AS THE DIMPLE. SEVERAL CURVIC CORRODED TOPS, INSIDE AND OUT. PT INNER SHAFT - THE FIRST .25 INCH OF THREAD CORMay 27, 1999 · Turbine SectionSDR 99ZZZX2344Shaft · corrodedPOWER TURBINE OUTER SHAFT HAS SEVERE DEEP CORROSION AT DIMPLES AND CURVIC COUPLING. CORROSION AT DIMPLES 360 DEGREES AROUND AND OVER HALF AS DEEP AS THE DIMPLE. SEVERAL CURVIC CORRODED TOPS, INSIDE AND OUT. PT INNER SHAFT - THE FIRST .25 INCH OF THREAD CORMay 27, 1999 · Turbine SectionSDR 99ZZZX2349Wheel · crackedTURBINE WHEEL RIM CRACKED THROUGH KNIVES.May 27, 1999 · Turbine SectionSDR 99ZZZX2358Bearing · failedPILOT FOUND GOVERNOR SWAGING ABOVE LIMITS FOR SAFE FLIGHT. ENIGNE SURGING 20 PSI TORQUE AND 5 PERCENT N2. UPON REMOVAL OF GOVERNOR, FOUND DRIVE SHAFT LOCKED-UP. COMPONENT P/N ALAA123065123.Feb 1, 1999 · N526FB · Hughes 500N · Turbine Governor
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 = '250C20R1'
  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 · 6

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.

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 ('03091')
    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.