Spey 555

Turbofan · Rolls-Royce

Reaction Turbines

Maximum Takeoff Thrust

44 kN

Bypass Ratio

Overall Pressure Ratio

15.9

Fuel Flow Take Off

0.735 kg/s

NOx Unitaryto CAEP8

118.8 % of limit

Architecture

Fan	Fan Stages —	Fan Blades —	Fan Technology —	Fan Pressure Ratio —
Gearbox	Geared Fan No	Gear —	Reduction Ratio —
LP compressor	Low-Pressure Compressor Stages —	Low-Pressure Compressor Technology —	BP Compressor Pressure Ratio —
IP compressor	Intermediary-Pressure Compressor Stages —	Intermediary-Pressure Compressor Technology —	IP Compressor Pressure Ratio —
HP compressor	High-Pressure Compressor Stages —	High-Pressure Compressor Technology —	HP Compressor Pressure Ratio —
Combustor	Combustion Chamber Transply IIF
HP turbine	High Pressure Compressor Stages —	High-Pressure Turbine Technology —
IP turbine	Intermediary-Pressure Turbine Stages —	Intermediary-Pressure Turbine Technology —
LP turbine	Low-Pressure Turbine Stages —	Low-Pressure Turbine Technology —
Whole engine	Streams 2	Bypass Ratio 1	Overall Pressure Ratio 15.9	Afterburner No

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Name	Aircraft Engine Manufacturer	Maximum Takeoff Thrust (kN)	Bypass Ratio	Overall Pressure Ratio
SPEY Mk555	Rolls-Royce	44	1	15.9	Compare
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All data (59 fields)

Name: Spey 555
EASA ID: 4RR035
Aircraft Engine Manufacturer: Rolls-Royce
Aircraft Engine Type: Turbofan
Fuel: AVTUR
Geared Fan: No
Combustion Chamber: Transply IIF
Afterburner: No
Streams: 2
Bypass Ratio: 1
Overall Pressure Ratio: 15.9
Maximum Takeoff Thrust (kN): 44
Hydrocarbon Take Off (g/kg fuel): 0.15
Hydrocarbon Climb Out (g/kg fuel): 0.22
Hydrocarbon Approach (g/kg fuel): 0.33
Hydrocarbon Idle (g/kg fuel): 3.41
Hydrocarbon Unitary Average (g/kN): 12.54
Hydrocarbon Unitary Range (g/kN): 10.4-15.9
Hydrocarbon Unitary Characteristic (g/kN): 19.3
Hydrocarbon Unitary Characteristicto Regulatory (% of limit): 98.5
Hydrocarbon LTO (g): 552
Carbon Monoxide Take Off (g/kg fuel): 1.54
Carbon Monoxide Climb Out (g/kg fuel): 2.08
Carbon Monoxide Approach (g/kg fuel): 5.78
Carbon Monoxide Idle (g/kg fuel): 31.16
Carbon Monoxide Unitary Average (g/kN): 118.08
Carbon Monoxide Unitary Range (g/kN): 116.5-120
Carbon Monoxide Unitary Characteristic (g/kN): 144.9
Carbon Monoxide Unitary Characteristicto Regulatory (% of limit): 122.8
NOx Take Off (g/kg fuel): 17.33
NOx Climb Out (g/kg fuel): 13.06
NOx Approach (g/kg fuel): 5.05
NOx Idle (g/kg fuel): 2.23
NOx Unitary Average (g/kN): 49.02
NOx Unitary Range (g/kN): 46.7-52.8
NOx Unitary Characteristic (g/kN): 56.8
NOx Unitaryto Standard (% of limit): 79.1
NOx Unitaryto CAEP2 (% of limit): 98.9
NOx Unitaryto CAEP4 (% of limit): 105.5
NOx Unitaryto CAEP6 (% of limit): 108.5
NOx Unitaryto CAEP8 (% of limit): 118.8
NOx LTO (g): 2160
Smoke Take Off (SN): 27.97
Smoke Climb Out (SN): 26.4
Smoke Approach (SN): 24.39
Smoke Idle (SN): 8.09
Smoke Max (SN): 27.97
Smoke Range (SN): 26.9-28.8
Smoke Characteristic (SN): 36
Smoke Characteristicto Regulatory (% of limit): 121.5
Fuel Flow Take Off (kg/s): 0.735
Fuel Flow Climbout (kg/s): 0.593
Fuel Flow Approach (kg/s): 0.221
Fuel Flow Idle (kg/s): 0.0964
Fuel LTO (kg): 313
Fuel Venting Compliant: No
Carbon Monoxide LTO (g): 5203
Emissions Data Status: C
Engine Status: Out of production