BOMBER BLEED AIR DISTRIBUTION

  1. provides hot, pressurized air for several key features for the aircraft.
    BLEED AIR
  2. Temperature and pressure dependent on
    throttle setting
  3. -is an external source for bleed air. 

    + Ground air cart

    - This is used for engine start
    Used for operational checks and troubleshooting

    +A/C system
    +Bleed Air System
    Dash 60A (-60A)
  4. +One is placed on each strut

    + Strut 2 is primary connection for engine starts and operational checks
    + Struts 1,3, & 4 alternate connection
    Ground Service Receptacle
  5. is in place to insure that air flows in only one direction and prevent reverse airflow.
    Ground Service Receptacle Check Valve
  6. • Strut number 2 (engines 3 and 4)
    -Last stage of compression 16th stage
    -Pressure and temperature depends on the throttle setting
    Internal (Normal) Source of Bleed Air
  7. -Prevents reverse flow
    -One per engine
    Engine Bleed Air Check Valves
  8. What is an Emergency Source of Bleed Air?
    Strut 3 (engine 5 & 6)
  9. • Reduces bleed air temperature
    - Transforms heat from bleed air to ram air
    +Located in strut 2
    - Bleed air SEEKS Ram Air
    Pre-cooler
  10. • Open for engine start
    -Open for operational check of bleed valve
    + Solenoid controlled 28-VDC, air actuated
    * HOT AIR VALVES *
    - Power and air needed to open
    + Failsafe closed
    - Controlled by the manifold valve switch
    Strut Bleed Air Valves 1 & 4
  11. • Located in the left wing manifold

    -Controls flow from strut 2

    +Actuated by 115 vac motor
    -Opens for normal system operation (IN FLT)
    -Opens for engine starts
    -CLOSED for emergencies 
    + Makes sure Strut #3 is closed
    +Controlled by Bleed selector, manifold valve switch, or the cabin pressure master switch
    Body Crossover Manifold Valve
  12. • Actuated by 115 vac motor
    - Normally closed
    + Opened for engine start
    - Opened for EMERGENCY bleed air
    - Closed during Normal Sys. Op. 
    + Controlled by (ALL 4 SW)

    Bleed selector(Emergencies),

    manifold valve switch(Engine Start, Opens Valve),
    or the cabin pressure master switch
    Strut 3
  13. Strictly used for Engine Start & OPS CHECKS.

    + OPEN - ALL VALVES OPEN
    + CLOSE - ALL VALVES CLOSED

    Operates: Strut 1,3,4 & Body Crossover Manifold
    Manifold Valve Switch
  14. • Determines source of bleed air by controlling Strut #3 & body manifold crossover

    Two Position

    Normal:

    -Strut 3 is CLOSED
    -Body crossover manifold valve OPEN

    Emergency:

    -Body crossover manifold valve CLOSED
    -Strut 3 bleed air valve is OPEN
    Bleed Selector Switch
  15. • Used to control A/C system
    Four Position

    Ram
    Off
    7.45 psi (normal)
    4.50 psi (combat)
    Cabin Pressure Master Switch
  16. Monitored to ensure proper operation of the bleed air system

    + Indicated temperature between 20 degrees – 300 degrees Centigrade (-4 to 575 degrees Fahrenheit)

    +Red Lined at 246 degrees centigrade (475 degrees Fahrenheit)
    Manifold Air Temperature Indicator
  17. + Senses bleed air manifold temp
    -Located in the engine bleed air manifold
    -Connected to the temperature indicator
    + Determines POS. of Temp. Indic.
    Sensing Bulb
  18. -Short sections
    -Corrosion resistant steel
    -Convey hot air
    -Support 

    +Single or double hinged swinging gates
    +Allow for pivoting action of the ducting
    + due to IN FLT AIRFRAME MOVEMENT
    Ducting
  19. +Allows doe thermal expansion

    +Compensates for twisting and bending due to normal expansion
    Bellows
  20. + Gasket used to prevent leaks
    • Used on HOT air ducts ONLY
    - Torque bolt
    *All screws&bolts have torque value *
    Bolted Flange (“bolts forged” HOT )
  21. +Used for COLD air ducts
    - Low pressure ducting
    -Torque T bolt
    + Uses a rubber sleeve
    Channel Band Coupling( “C”  Chilli COLD )
  22. +Used for COLD or HOT ducts
    - Torque T bolt
    V-Band Couplings “V” Varies
  23. -Metal foil type
    -Cut down on heat loss
    -Prevents damage to equipment
    -Aids in preventing burns
    Insulation
  24. HOT AIR = Bad ; COLD AIR = Good
    DURING EMERGENCY.
  25. Distribution: One Source coming in & splits it off.
    MANIFOLD
  26. - Strut #3
    - Engine 5&6
    - B/A temperature increases 
    - * Limited RPM 80%
    Engine Source of Bleed Air
  27. SPRING LOADED CLOSED
    HOT AIR VALVE
  28. SPRING LOADED OPEN
    COLD AIR VALVE
Author
carLORENZ0
ID
255370
Card Set
BOMBER BLEED AIR DISTRIBUTION
Description
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Updated