Engines

Card Set Information

Author:
chzor86
ID:
97693
Filename:
Engines
Updated:
2011-08-20 17:00:12
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  1. 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
  2. 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
  3. Parts and Pieces:
    N1
    • -- N1 is two stage axial compressor / two stage axial turbine
    • -- 104% max continuous RPM
    • -- 106% max transient RPM
  4. Parts and Pieces:
    N2
    • -- N2 is high pressure single stage compressor / single stage high turbine
    • -- 96% max continuous RPM
  5. 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’
  6. Parts and Pieces:
    Exhaust Duct
    --Cold nozzle configuration; bypass flow mixed with core flow for cooler exhaust temperatures
  7. Parts and Pieces:
    Fuel Shutoff Valve
    -- Mechanical device to detect aft movement of N1­ shaft and shutdown engine
  8. Parts and Pieces:
    Stator Vanes
    -- Behind compressors, smooth and direct air flow
  9. 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
  10. Parts and Pieces:
    Compressor Surge Bleed Valve
    --Valve opens to prevent compressor surge during engine acceleration at high AOA
  11. Parts and Pieces:
    Bleed Air
    • -- Cools engine
    • -- ACM
    • -- Hydraulic system (15psi, no bubbles)
    • -- Engine and wing Anti-ice
  12. Parts and Pieces:
    Oil Capacity
    • 2.03 gal
    • 1.84 gallons drainable, synthetic oil only

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