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AST 473 CE 550 Citation II Systems. Fire Protection System. General. 2 separate but identical engine fire detection & extinguishing systems Components: Sensing loops (turbine scn. And acc. Scn.) Control units ENG Fire warning switchlight (ea. Engine) Extinguisher bottles (2 ea.)

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ast 473 ce 550 citation ii systems

AST 473CE 550 Citation II Systems

Fire Protection System

  • 2 separate but identical engine fire detection & extinguishing systems
  • Components:
    • Sensing loops (turbine scn. And acc. Scn.)
    • Control units
    • ENG Fire warning switchlight (ea. Engine)
    • Extinguisher bottles (2 ea.)
    • Fire detection circuit test function
general ctn
General Ctn.

Fire Bottles:

-Located in tail cone (check on preflight)

-Charged to 600 psi @70 degrees (use scale)

-Monobromotriflouromethane, CBrF (3)- not corrosive- no residue

-Discharged by Squibb (explosive cartridge)

-Both bottles available to either engine (30s)

-Filler fuse melts at 210 deg. F; =discharge

  • 1 cable each engine- monitored by a control unit (tail cone) measuring electrical resistance which decreases with temp.
  • At 500 deg. F. the circuit completes causing the red Eng Fire light to illuminate but not tripping the MWL.
  • Powered by main DC power
  • At L or Rt. Eng. Fire light:
    • Verify fire- temp gauges
    • Push Respective Eng. Fire light (lift cover)
      • Illuminates both “bottle armed” lights arming them
      • Closes fuel and hydraulic firewall shutoff valves (fuel press/hyd. Press low lights illuminate)
      • Generator field relay tripped (gen. off light illuminates).
      • Thrust reverser isolation valve circuit disabled
operation ctn
Operation Ctn.
  • Pressing bottle armed switch light discharges the bottle contents into selected engine
  • A second bottle can be fired in 30 sec. if needed.
  • Depressing ENG FIRE switchlight again:
    • Opens firewall shutoff valves
    • Disarms extinguishing system
    • Reverser isolation valve re-enabled
    • (gen. field will be reset upon eng. Start)
portable extinguishers
Portable Extinguishers
  • 2ea. 2.5 lb. Halon extinguishers in interior:
    • 1 under co-pilot’s seat
    • 1 in cabin area
    • Each charged to 125 psi.
  • Engine Compressor Bleed Air provides pressurized air to a pneumatic manifold for distribution to:
    • Left and Rt. Flow control valves for use by the Air Cycle Machine (ACM- AiResearch)
    • Ground Valve- ACM ground ops.
    • Emergency Valve- alt. pressurization source
    • Service Air System Valves (windshield anti-ice, cabin door seal, deice boots, Instr. Air)
  • 1 engine can supply total system needs
  • Airflow control into cabin controlled by the PRESS SOURCE selector (6 pos.) just to the right of the pedestal.
  • Temp. sensors in the system illuminate annunciators on the main panel (Air Duct Overheat, L/R Precool fail)
  • Engine Bleed Air flows to the welded cluster assembly (manifold) to:
    • Pneumatic valves to Windshield Anti-ice
    • Vacuum ejector
    • Pneumatic Distribution Regulator (for boots, instrument air, and door seal)
    • Air from left eng. Cluster flows to the emerg.valve for emerg. Pressurization (direct bleed air to cabin; only in flight- cabin temp. controlled by throttle position)
  • Air from the Right engine is routed through the right pneumatic cluster to the ground valve for use by the ACM during ground ops.- 18 lbs/min.
  • Flow from both clusters is routed through both main pneumatic flow control shutoff valves for use by the ACM (normal ops.)
  • Prior to this, bleed air flows through an air-to-air heat exchanger flow control valve (automatic valve) which directs air through or around a Precooler which lowers the temp. to 500 deg. F. prior to entering tailcone
  • If airflow out of the precooler exceeds 540 deg. F. the PRECOOL FAIL light illuminates.
  • Press Source selector determines:
    • Amount of air entering cabin
    • Source of that air
    • It is a 7 position switch (OFF, GND, LH, NORMAL, BOTH HI, RH, EMER).
  • Closes all environmental bleed-air valves
  • LH and RH flow control valves energized closed by DC
  • EMER valve is energized closed
  • NO air enters pressure vessel from engines (if depressurized ram air from tailcone flows into cabin)
  • Bleed Air still available to: service Air system (door seal, copilot’s ADI, vacuum ejector pump, and deicer boots)
  • For ground use only
  • Allows up to 18 ppm air from RT. Engine into pneumatic manifold
  • Illuminates BLD AIR GND annunciator
  • Need 60% N2 for full 18ppm flow
lh rh position
LH/RH Position
  • Limit pneumatic bleed air input to ACM and Service Air systems
  • LH position isolates the flow from the rt. Eng. And visa-versa- only one valve can be closed at any one time
  • IE. If LH is selected (due to a RH pre-cool failure) and the Left eng. Fails; all air to the ACM is lost unless RH is re-selected
  • De-energizes open the left and right flow control and shutoff valves and allows air from both engines to pass into the manifold; T/O perf. Based on this position
both hi
Both HI
  • Position Energizes left and right flow control valves to a higher position to allow 9ppm air into the ACM
    • Needed for low power settings
    • Illuminates BLEED AIR GND/HI light
    • Prohibited for T/O and lndgs. And high pwr. Settings
    • If main DC lost, valves fail to the 6ppm normal low flow mode
  • Direct Bleed air to cabin
  • In this position (or whenever the valve opens automatically the EMER PRESS ON annunciator illuminates and all other valves energize closed
dc power fail
DC power fail
  • System defaults to the NORMAL setting
  • Ground and Emerg. Press. Valves fail closed
  • Two flow control and shutoff valves fail open to “low flow” mode
  • Pneumatic Distribution valves fail open.