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General Specifications
- -- Two pod mounted Pratt & Whitney JT15D-5B turbofan engines
- -- Advantages- Better fuel specs, Shorter Take-off, Efficiency at low altitude, reduced noise
- -- Disadvantages- Reduced efficiency at high altitudes, slower speeds
- -- Engines are monitored in cockpit by N1, ITT, N2, FF, Oil temp, Oil Press and vibration guages
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Thrust
- Flat rated to provide constant thrust throughout various altitudes and temperature ranges
- -- Sea level to 27°C => 2900 lbs. of thrust for 5 minutes
- Divided Flow
- -- Bypass flow (low altitude thrust) driven by N1
- -- Core flow (high altitude thrust) driven by N2
- Take-off Rated Thrust limiting factors-
- -- N1 104%, 700°C, 2900lbs thrust
- Max Continuous Thrust limiting factors- -- N1 104%, 680°C, 2900lbs thrust
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Parts and Pieces:
N1
- -- N1 is two stage axial compressor / two stage axial turbine
- -- 104% max continuous RPM
- -- 106% max transient RPM
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Parts and Pieces:
N2
- -- N2 is high pressure single stage compressor / single stage high turbine
- -- 96% max continuous RPM
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Parts and Pieces:
Combustion Chamber
- -- 12 nozzle housings that atomize fuel and 2 dual spark igniters
- -- Igniters in STBY provide spark at start, anti-ice, stick shaker up to 50,000’
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Parts and Pieces:
Exhaust Duct
--Cold nozzle configuration; bypass flow mixed with core flow for cooler exhaust temperatures
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Parts and Pieces:
Fuel Shutoff Valve
-- Mechanical device to detect aft movement of N1 shaft and shutdown engine
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Parts and Pieces:
Stator Vanes
-- Behind compressors, smooth and direct air flow
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Parts and Pieces:
Accessory Gearbox
- (Driven by N2 shaft)
- --DC starter generator
- -- N2 speed sensor
- -- Oil pump
- -- Fuel pump- increases fuel pressure from 15psi to 580psi max
- -- Hydromechanical Metering Unit (HMU)- sole provider of fuel up to 38%N2
- -- Hydraulic pump
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Parts and Pieces:
Compressor Surge Bleed Valve
--Valve opens to prevent compressor surge during engine acceleration at high AOA
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Parts and Pieces:
Bleed Air
- -- Cools engine
- -- ACM
- -- Hydraulic system (15psi, no bubbles)
- -- Engine and wing Anti-ice
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Parts and Pieces:
Oil Capacity
- 2.03 gal
- 1.84 gallons drainable, synthetic oil only
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