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35 Cards in this Set

  • Front
  • Back

DC SERVICE SWITCH

Powers the DC Service Bus from the APU Battery Direct Bus

BATTERY MASTER SWITCH

Connects the main battery and APU battery to the Battery Bus via the Main Battery Direct Bus and the APU Battery Direct Bus

EXTERNAL DC POWER SWITCH. AVAIL/IN USE

AVAIL = DC power is connected and is operating within limits (Voltage and Polarity). IN USE = External DC power is supplying power to the APU and Main Battery Direct Bus

EXTERNAL AC POWER SWITCH. AVAIL/IN USE

AVAIL = AC power source is connected and within limits (Voltage, Phase, and Frequency). IN USE = External AC power source is powering the electrical system

IDG DISCONNECT SWITCH. FAULT/DISC

FAULT = High oil temperature or low oil pressure. DISC = Will automatically disconnect for Over temp or Over torque.

AC ESS XFER SWITCH

Illuminated when AC Essential Bus is not being powered by AC bus 1. It can auto or manual transfer to AC Bus 2

GENERATOR SWITCH

Connects the generator to the associated AC bus

APU GENERATOR SWITCH

Connects the APU generator to the AC busses

AC BUS AUTOMATIC TRANSFER SWITCH. FAIL/OFF

FAIL = A Bus fault or generator overcurrent. The associated AC Bus cannot be powered by the APU or offside generator. OFF = Manually disables the priority/auto transfer system.

BUS TIE SWITCHES 1 & 2

TIE 1 illuminates when DC bus 1 is not being powered by its normal source. The TRU 2 or Service TRU powers DC bus 1. TIE 2 illuminates when DC bus 2 is not being powered from its normal source. TRU1 or Service TRU powers DC bus 2

ESS BUS TIE SWITCH

MANUAL ONLY! Ties the Service TRU to the DC Essential and Battery Bus during an Essential TRU 2 failure.

ENGINE FIRE DETECTION SWITCH

A drop in electrical resistance in loop A and B will trigger a fire warning

JETPIPE/PYLON OVERHEAT SWITCH

A drop in electrical resistance in loop A and B will trigger an overheat warning.

APU FIRE DETECTION SWITCH

A drop in electrical resistance in loop A and B will trigger a fire warning

FIRE DETECTION TEST SWITCH. WARN/FAIL

WARN: Simulates a fire or overheat in the APU and Engines. Tests Fire Bell, and APU/ENGINE FIRE, JETPIPE OVERHEAT & JETPIPE OVERHEAT AURAL WARNING. Associated switch lights and fire bottles illuminate. FAIL: Simulates a short on the the loops.

BOOST PUMP SWITCH. PUSH IN/ON/INOP

PUSH IN: 1. During engine start, both boost pumps operate 2. Both engines running, pumps are off and will automatically operate when low pressure is detected in either engine fuel feed line. ON: Illuminates when the associated pump is operating. INOP: A low pressure condition has been detected in the engine feed line, and the respective boost pump has not been armed, or has failed.

GRAVITY CROSSFLOW SWITCH. PUSH IN/PUSH OUT/FAIL

PUSH IN: Opens the gravity balance shutoff valve. The OPEN light illuminates. RELEASE OUT: Closes the balance line shutoff valve. FAIL: The balance line shutoff valve is not in the commanded position.

L/R XFLOW SWITCH. PUSH IN/PUSH OUT/FAIL

PUSH IN: 1. Opens the respective XFLOW shutoff valve (must have XFLOW AUTO OVERRIDE switch selected to manual mode for valve to operate.) 2. The ON light illuminates 3. The XFLOW/APU pump operates. PUSH OUT: 1. Closes the respective crossflow shutoff valve 2. The ON light extinguishes 3. The XFLOW/APU pump stops. FAIL: The respective XFLOW shutoff valve is not in the commanded position or the XFLOW/APU pump fails to operate when the left or right XFLOW shutoff valve opens.

XFLOW AUTO OVERRIDE SWITCH. PUSH IN/PUSH OUT

PUSH IN: Arms the XFLOW/APU pump for manual XFLOW operation. Automatic operation is disabled. The MAN light illuminates. PUSH OUT: Arms the XFLOW/APU pump for automatic crossflow operation. Manual operation is disabled.

DUCT MONITOR SELECTOR SWITCH. TEST/NORM/LOOP A/LOOP B

TEST: Simulates a duct failure to test the 10th and 14th stage loops. NORM: Leak detection and warning is provided in all pneumatic ducting in the fuselage, pylon, and wing areas. LOOP A: Tests the 10th stage loop A for continuity. LOOP B: Tests the 10th stage loop B for continuity.

14th STAGE SWITCH. PUSH IN/PUSH OUT/DUCT FAIL

PUSH IN: Associated bleed air shutoff valve opens. PUSH OUT: The associated bleed air shutoff valve closes. DUCT FAIL: Illuminates to indicate a failure in the associated 14th stage duct. The light extinguishes when the failure is isolated and the duct cools below a predetermined value.

14th STAGE ISOLATION VALVE SWITCH. PUSH IN/PUSH OUT

PUSH IN: Opens the 14th stage bleed air isolation valve. PUSH OUT: Closes the 14th stage bleed air isolation valve

10th STAGE SWITCH. PUSH IN/PUSH OUT/DUCT FAIL

PUSH IN: Associated bleed air shutoff valve opens. PUSH OUT: The associated bleed air shutoff valve closes. DUCT FAIL: Illuminates to indicate a failure in the associated 10th stage duct. The light extinguishes when the failure is isolated and the duct cools below a predetermined value.

10TH STAGE ISOLATION VALVE SWITCH. PUSH IN/PUSH OUT

PUSH IN: Opens the 10th stage bleed air isolation valve. PUSH OUT: Closes the 10th stage bleed air isolation vlave.

APU LOAD CONTROL SWITCH. PUSH IN/PUSH OUT/FAIL

PUSH IN: Connects the APU pneumatic duct to the 10th stage bleed air manifold. PUSH OUT: Closes the APU load control valve and isolates the APU pneumatic duct from the 10th stage bleed air manifold. FAIL: Illuminates to indicate that the APU load control valve is not in the commanded position.

APU START SWITCH. PUSH IN/PUSH OUT/AVAIL

PUSH IN: 1. Energizes the starter motor, and the start light illuminates. 2. At 50% RPM, the START light extinguishes 3. Four seconds after the APU RPM reaches 95% RPM, the AVAIL light illuminates. PUSH OUT: Closes the Fuel Control Unit shutoff valve. The APU shuts down and the AVAIL light extinguishes.  AVAIL: Pneumatics are available for use.

APU PWR/FUEL SWITCH. PUSH IN/PUSH OUT/PUMP FAIL/SOV FAIL

PUSH IN- Initiates the ECU start up procedure and energizes the START/STOP switch.  PUSH OUT- Initiates the power down sequence of the ECU.  PUMP FAIL- Indicates failure of the APU/XFLO pump. SOV FAIL- indicates SOV valve not in the commanded position.

HYDRAULIC SWITCHES 1 & 2.  ON/OFF/AUTO

ON- Selected pumps are energized.  OFF- selected pumps are de-energized.  AUTO: With flaps greater than 0º and cross-side IDG operating, pumps are energized.  Flaps 0º, de-energized.

PRESS CONT. PUSH IN/MAN/FAULT

PUSH IN: Switches pressurization controller to manual mode and activates MAN ALT UP/DOWN switch.  PUSH IN (second time): changes pressurization controller to the standby AUTO controller.  MAN: Indicates manual pressurization control.  FAULT: Indicates failure of both automatic pressurization controllers.

L/R PACK SWITCHLIGHTS.  PUSH IN/FAULT/OFF

PUSH IN: Allows pack to open provided there is sufficient pressure.  FAULT:  Indicates pack fault condition.  OFF:  Pack is commanded closed

L/R MANUAL PACK SWITCHLIGHTS. MAN

MAN:  Activates manual control of pack output temperature using the associated HOT/COLD toggle switch.

CARGO FAN SWITCH.  OFF/FAN/COND AIR

OFF:  De-energizes the FAN and heater; closes the cargo inlet and outflow valves and COND AIR valve.  FAN: Opens the cargo inlet and outflow valves and energizes the fan and heater.  COND AIR:  Opens the cargo inlet and outflow valves and energizes the fan and heater.  Draws cabin exhaust air through the cargo compartment.

WING ANTI-ICE SWITCH.  STBY/OFF/NORM

STBY: Opens and closes the wing anti-ice valves to maintain a cooler temperature than NORM.  OFF:  Closes wing anti-ice valves.  NORM:  Modulates the wing anti-ice valves to maintain optimum temperature for anti-icing.

WING ANTI-ICE TEST SWITCHLIGHT.  TEST/OVHT/DUCT FAIL

TEST: Performs a test of the overheat detection system.  OVHT: Indicates an overheat condition in a bleed air duct.  DUCT FAIL:  Indicates a bleed air leak in the anti-ice ducting.

EMER LTS.  ON/OFF/ARM

ON:  Illuminates all emrgency lights.  OFF:  Disarms all emergency lights.  AUTO:  Arms the automatic illumination of emergency lights based on gear and flap position.