AST 473AST 473CE 550 Citation II SystemsCE 550 Citation II Systems

Fire Protection SystemFire Protection System

GeneralGeneral

• 2 separate but identical engine fire 2 separate but identical engine fire detection & extinguishing systemsdetection & extinguishing systems

• Components:Components:– Sensing loops (turbine scn. And acc. Scn.)Sensing loops (turbine scn. And acc. Scn.)– Control unitsControl units– ENG Fire warning switchlight (ea. Engine)ENG Fire warning switchlight (ea. Engine)– Extinguisher bottles (2 ea.)Extinguisher bottles (2 ea.)– Fire detection circuit test functionFire detection circuit test function

General Ctn.General Ctn.

Fire Bottles:Fire Bottles:

-Located in tail cone (check on preflight)-Located in tail cone (check on preflight)

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

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

-Discharged by Squibb (explosive cartridge)-Discharged by Squibb (explosive cartridge)

-Both bottles available to either engine (30s)-Both bottles available to either engine (30s)

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

OperationOperation

• 1 cable each engine- monitored by a 1 cable each engine- monitored by a control unit (tail cone) measuring control unit (tail cone) measuring electrical resistance which decreases electrical resistance which decreases with temp.with temp.

• At 500 deg. F. the circuit completes At 500 deg. F. the circuit completes causing the red Eng Fire light to causing the red Eng Fire light to illuminate but not tripping the MWL.illuminate but not tripping the MWL.

• Powered by main DC powerPowered by main DC power

OperationOperation

• At L or Rt. Eng. Fire light:At L or Rt. Eng. Fire light:– Verify fire- temp gaugesVerify fire- temp gauges– Push Respective Eng. Fire light (lift cover)Push Respective Eng. Fire light (lift cover)

• Illuminates both “bottle armed” lights arming Illuminates both “bottle armed” lights arming themthem

•Closes fuel and hydraulic firewall shutoff valves Closes fuel and hydraulic firewall shutoff valves (fuel press/hyd. Press low lights illuminate)(fuel press/hyd. Press low lights illuminate)

•Generator field relay tripped (gen. off light Generator field relay tripped (gen. off light illuminates).illuminates).

•Thrust reverser isolation valve circuit disabledThrust reverser isolation valve circuit disabled

Operation Ctn.Operation Ctn.

• Pressing bottle armed switch light Pressing bottle armed switch light discharges the bottle contents into discharges the bottle contents into selected engineselected engine

• A second bottle can be fired in 30 sec. if A second bottle can be fired in 30 sec. if needed.needed.

• Depressing ENG FIRE switchlight again:Depressing ENG FIRE switchlight again:– Opens firewall shutoff valvesOpens firewall shutoff valves– Disarms extinguishing systemDisarms extinguishing system– Reverser isolation valve re-enabledReverser isolation valve re-enabled– (gen. field will be reset upon eng. Start)(gen. field will be reset upon eng. Start)

Portable ExtinguishersPortable Extinguishers

• 2ea. 2.5 lb. Halon extinguishers in 2ea. 2.5 lb. Halon extinguishers in interior:interior:– 1 under co-pilot’s seat1 under co-pilot’s seat– 1 in cabin area1 in cabin area

– Each charged to 125 psi.Each charged to 125 psi.

AST 473AST 473CE-550 Citation II SystemsCE-550 Citation II Systems

PneumaticsPneumatics

GeneralGeneral

• Engine Compressor Bleed Air provides Engine Compressor Bleed Air provides pressurized air to a pneumatic manifold pressurized air to a pneumatic manifold for distribution to:for distribution to:– Left and Rt. Flow control valves for use by Left and Rt. Flow control valves for use by

the Air Cycle Machine (ACM- AiResearch)the Air Cycle Machine (ACM- AiResearch)– Ground Valve- ACM ground ops.Ground Valve- ACM ground ops.– Emergency Valve- alt. pressurization sourceEmergency Valve- alt. pressurization source– Service Air System Valves (windshield anti-Service Air System Valves (windshield anti-

ice, cabin door seal, deice boots, Instr. Air)ice, cabin door seal, deice boots, Instr. Air)

GeneralGeneral

• 1 engine can supply total system needs1 engine can supply total system needs

• Airflow control into cabin controlled by Airflow control into cabin controlled by the PRESS SOURCE selector (6 pos.) just the PRESS SOURCE selector (6 pos.) just to the right of the pedestal.to the right of the pedestal.

• Temp. sensors in the system illuminate Temp. sensors in the system illuminate annunciators on the main panel (Air annunciators on the main panel (Air Duct Overheat, L/R Precool fail)Duct Overheat, L/R Precool fail)

OperationOperation

• Engine Bleed Air flows to the welded Engine Bleed Air flows to the welded cluster assembly (manifold) to:cluster assembly (manifold) to:– Pneumatic valves to Windshield Anti-icePneumatic valves to Windshield Anti-ice– Vacuum ejectorVacuum ejector– Pneumatic Distribution Regulator (for boots, Pneumatic Distribution Regulator (for boots,

instrument air, and door seal)instrument air, and door seal)– Air from left eng. Cluster flows to the Air from left eng. Cluster flows to the

emerg.valve for emerg. Pressurization emerg.valve for emerg. Pressurization (direct bleed air to cabin; only in flight- (direct bleed air to cabin; only in flight- cabin temp. controlled by throttle position)cabin temp. controlled by throttle position)

OperationOperation

• Air from the Right engine is routed Air from the Right engine is routed through the right pneumatic cluster through the right pneumatic cluster to the ground valve for use by the to the ground valve for use by the ACM during ground ops.- 18 lbs/min.ACM during ground ops.- 18 lbs/min.

• Flow from both clusters is routed Flow from both clusters is routed through both main pneumatic flow through both main pneumatic flow control shutoff valves for use by the control shutoff valves for use by the ACM (normal ops.)ACM (normal ops.)

OperationOperation

• Prior to this, bleed air flows through Prior to this, bleed air flows through an air-to-air heat exchanger flow an air-to-air heat exchanger flow control valve (automatic valve) which control valve (automatic valve) which directs air through or around a directs air through or around a Precooler which lowers the temp. to Precooler which lowers the temp. to 500 deg. F. prior to entering tailcone500 deg. F. prior to entering tailcone

• If airflow out of the precooler If airflow out of the precooler exceeds 540 deg. F. the PRECOOL exceeds 540 deg. F. the PRECOOL FAIL light illuminates.FAIL light illuminates.

ControlControl

• Press Source selector determines:Press Source selector determines:– Amount of air entering cabinAmount of air entering cabin– Source of that airSource of that air

– It is a 7 position switch (OFF, GND, LH, It is a 7 position switch (OFF, GND, LH, NORMAL, BOTH HI, RH, EMER).NORMAL, BOTH HI, RH, EMER).

OFFOFF

• Closes all environmental bleed-air valvesCloses all environmental bleed-air valves• LH and RH flow control valves energized LH and RH flow control valves energized

closed by DCclosed by DC• EMER valve is energized closedEMER valve is energized closed• NO air enters pressure vessel from NO air enters pressure vessel from

engines (if depressurized ram air from engines (if depressurized ram air from tailcone flows into cabin)tailcone flows into cabin)

• Bleed Air still available to: service Air Bleed Air still available to: service Air system (door seal, copilot’s ADI, vacuum system (door seal, copilot’s ADI, vacuum ejector pump, and deicer boots)ejector pump, and deicer boots)

GroundGround

• For ground use onlyFor ground use only

• Allows up to 18 ppm air from RT. Allows up to 18 ppm air from RT. Engine into pneumatic manifoldEngine into pneumatic manifold

• Illuminates BLD AIR GND annunciatorIlluminates BLD AIR GND annunciator

• Need 60% N2 for full 18ppm flowNeed 60% N2 for full 18ppm flow

LH/RH PositionLH/RH Position

• Limit pneumatic bleed air input to ACM Limit pneumatic bleed air input to ACM and Service Air systemsand Service Air systems

• LH position isolates the flow from the rt. LH position isolates the flow from the rt. Eng. And visa-versa- only one valve can Eng. And visa-versa- only one valve can be closed at any one timebe closed at any one time

• IE. If LH is selected (due to a RH pre-cool IE. If LH is selected (due to a RH pre-cool failure) and the Left eng. Fails; all air to failure) and the Left eng. Fails; all air to the ACM is lost unless RH is re-selectedthe ACM is lost unless RH is re-selected

NormalNormal

• De-energizes open the left and right De-energizes open the left and right flow control and shutoff valves and flow control and shutoff valves and allows air from both engines to pass allows air from both engines to pass into the manifold; T/O perf. Based on into the manifold; T/O perf. Based on this positionthis position

Both HIBoth HI

• Position Energizes left and right flow Position Energizes left and right flow control valves to a higher position to control valves to a higher position to allow 9ppm air into the ACMallow 9ppm air into the ACM– Needed for low power settingsNeeded for low power settings– Illuminates BLEED AIR GND/HI lightIlluminates BLEED AIR GND/HI light– Prohibited for T/O and lndgs. And high pwr. Prohibited for T/O and lndgs. And high pwr.

SettingsSettings– If main DC lost, valves fail to the 6ppm If main DC lost, valves fail to the 6ppm

normal low flow modenormal low flow mode

EMEREMER

• Direct Bleed air to cabinDirect Bleed air to cabin

• In this position (or whenever the In this position (or whenever the valve opens automatically the EMER valve opens automatically the EMER PRESS ON annunciator illuminates PRESS ON annunciator illuminates and all other valves energize closedand all other valves energize closed

DC power failDC power fail

• System defaults to the NORMAL System defaults to the NORMAL settingsetting

• Ground and Emerg. Press. Valves fail Ground and Emerg. Press. Valves fail closedclosed

• Two flow control and shutoff valves Two flow control and shutoff valves fail open to “low flow” modefail open to “low flow” mode

• Pneumatic Distribution valves fail Pneumatic Distribution valves fail open.open.