B763 Air / Pneumatic

Conditioned air is attached to the aircraft. Before connecting it: both packs should be selected off. the left pack should be selected off so that all the conditioned air feeds the passenger cabin. both packs should be selected on. both packs should be selected to STANDBY NORMAL.

Which is true of the Recirculation Fans? (Passenger Aircraft). Switching a recirculation fan off reduces fuel consumption slightly. Both recirculation fans can be switched OFF in flight if a more rapid exchange of air is desired. The recirculation fans maintain the desired level of cabin ventilation, while maximising the use of bleed air. Both (b) and (c) are correct.

Which of the following statements is NOT true of the Air Conditioning sytem?. The flight deck receives fresh conditioned air from the left pack only, at a slightly higher pressure than the passenger cabin. A pack INOP light means the pack has automatically shut down, due to an automatic control fault or a pack overheat. The pack valve remains OPEN. A pack INOP light means the pack has automatically shut down, due to an automatic control fault or a pack overheat. The pack valve is CLOSED. A pack OFF light means the pack valve is CLOSED. The pack has either tripped OFF, been selected OFF or there is no air to the pack.

One or more recirculation fans may be inhibited: when FWD EQPT SMOKE detected. when either Cargo Fire extinguisher ARM switches is pressed. during electrical equipment load-shedding. Any of the above.

How many ground pneumatic air supply connectors are there?. 1. 2. 3. 4.

In the Forward Equipment Cooling system, if the operating supply fan fails: The alternate fan must be selected by pushing the ALTN EQUIP COOLING Switch. the alternate fan starts automatically. the Overboard Exhaust Valve opens automatically. the alternate fan starts automatically after 5 minutes.

The Overboard Exhaust Valve in the Forward Equipment Cooling system opens: after landing to depressurise the aircraft. when the differential pressure is more than 2.0 psi. if the Right Recirculation Fan is selected OFF in flight. when smoke is detected in the Forward Equipment Cooling System.

Aneroid switches will automatically close the outflow valve if cabin pressure exceeds: 8,500 ft. 10,000 ft. 11,000 ft. 14,000 ft.

APU bleed air is available up to approximately: 10.000ft. 17.000ft. 20.000ft. Maximum Operating Altitude.

When are the Left and Right Isolation valves normally closed?. Before Take off. Before Engine start. After Take off. After Engine start.

The Air Driven Hydraulic Pump and the Aft Cargo compartment use bleed air delivered through the Center Pneumatic Duct. TRUE. FALSE.

What does it mean when the Isolation valve light come ON?. Valve and switch are not in position. The valve is Open. The valve is Closed.

During low thrust setting, the High Pressure HP valve is closed. TRUE. FALSE.

What wil cause the automatic closure of the APU bleed air valve?. Turning the Center Isolation switch OFF. Turning an engine bleed air switch OFF. Starting an engine.

The ground connectors on the left side of the aircraft permit: 1 Pack operation or engine start. 2 Pack operation or engine start. Engine start only.

When will the Left DUCT LEAK fo out if it is illuminated?. When maintenance resets the bleed air valve. When the temperature along the pneumatic duct cools down. When the bleed air swtich is recycled.

Bleed Air valves are used for pressure control and are (electrically commanded, pressure actuated) closed during period of Low air demand. TRUE. FALSE.

What is indicated if a Left or Right DUCT LEAK light is ON?. A Pneumatic duct leak. High wing anti-ice bleed air temperature. High bleed air temperature in the pneumatic duct.

What causes a Center DUCT LEAK light to illuminate?. High temperature around the FWD Cargo compartment. High temperature in the Center Pneumatic Duct. Center Pneumatic duct leak.

Which of these systems become Inoperative when bleed air is prevented from entering in the Center Pneumatic Duct?. L & R hydraulic system reservoirs. FWD & AFT Cargo heat. ADP & AFT Cargo heat.

Which system is degraded without Center Duct Air?. Center hydraulic reservoir. FWD Cargo heat. Wing Anti Ice. Left Hydraulic reservoir.

What indication do you see if there is a Bleed air leak in the manifold?. DUCT OVHT light. BLEED OVHT light on. L or R DUCT LEAK light on.

If a OVHT light comes ON, what action must be taken to return the bleed air system to normal operation?. Push the bleed air switch OFF then ON. Decrease thrust setting. Increase thrust setting.

What Isolation valve must be open to allow the flow of APU bleed air into the manifold?. R ISLN. L ISLN. C ISLN.

What does the BLEED light indicates?. Engine bleed air overtemperature. Engine low pressure valve open. Engine high pressure valve open.

Which valves must be open to start the Left engine using a ground air cart?. L ISLN + starter. Starter only. L ISLN + C ISLN + starter.

L + R ISLN switches should be ON for: Engine starting. Air conditioning pack or engine starting. Air conditioning pack.

The pressure read on the Pneumatic Duct pressure indicator should be approximately equal. TRUE. FALSE.

What is indicated if either the Left or Right DUCT LEAK light stays on after the duct leak procedural steps have been completed?. A leak in the crossover manifold. Overtemperature in the crossover manifold. Overpressure in the crossover manifold.

Which of the following valves isolate the Left and Right Pneumatic system?. Left & Right isolation valves, the associated check valves & the Center Isolation valve. Left & Right isolation valves. Left & Right isolation valves & the associated check valves.

At 32.000ft ENG Bleed valves fail. Can the APU be selected as the air source?. YES. NO.

What occurs after a cabin zone temperature is turned off?. The packs produce maximum cooling. Zone trim air is lost & the INOP light stays ON. Zone trim air is lost & the INOP lights goes out.

Under which of the following conditions is the pack high flow operation inhibited in flight?. During engine anti ice operation. All statements are correct. During wing anti ice operation and only when one engine is supplying bleed air. When the equipment cooling system is configured to evacuate smoke.

Following a cargo compartment overheat, what indicates that the compartment has cooled to an acceptable temperature?. The OVHT light and FWD Cargo OVHT EICAS advisory message disappear. The ON light in the affected Cargo Heat switch comes back ON. Pressing the FWD Cargo OVHT switch resets the system and if it has cooled, the indication will not be displayed again.

CABIN ALTITUDE EICAS warning message appears during flght, what has happened?. Cabin altitude is now the proper corresponding auto-schedule. Cabin differential pressure is too high. Cabin altitude has exceeded 10.000ft. Cabin differential pressure is too low.

What is the indication of a successful pack reset?. EICAS messages removed. Pack lights go out. EICAS messages remain. Pack lights go out. EICAS messages removed. Pack lights remain ON. EICAS messages remain. Pack lights remain ON.

During walkaround you hear a steady horn up in the nose gear well. What might be the problem?. The GND Crew call horn gets activated by an E/E cooling system OVHT light or by the IRUs drooping to ON DC on the ground (AC power removed). The GND Crew call horn gets activated by a cooling system OVHT light (overtemp protection closes the Eng BLEED valve). The GND Crew call horn gets activated by an E/E cooling system OVHT light.

What do AUTO 1 and AUTO 2 mode have in common?. Both share the same pressurization unit. Both are powered from the same AC bus. Both operate identically.

A Pack trip cannot be reset in STBY, What should you do?. Turn off the PACK. Switch to STBY W and reset. Open the R ISLN valve.

What does the TRIM AIR OFF Light indicate?. A fault in the master trim air valve. The Trim air switch is off. An overheat in the trim air system.

Why is recirculated air used for air conditioning? (Passenger aircraft). To provide warmer air in some zones. To increase flow from the packs. To reduce bleed air requirements.

The Right pack INOP and PACK OFF lights are ON. The Right pack is tripped. What are the indications of a successful pack reset?. The INOP & PACK OFF light remain ON. The INOP & PACK OFF light go out. The INOP light remains ON & PACK OFF light goes out.

What is possible cause for a PACK OFF indication?. No bleed air pressure to the Left PACK. The LEFT temperature controller has an internal fault. The LEFT pack has tripped off due to overheat.

The Master TRIM AIR switch is OFF. What cabin temperature do the PACKS attempt to maintain?. 24C / 75F. Variable depending zone requirements. 18C / 65F.

When all Zone Temperature INOP lights are ON, What cabin temperature will the packs maintain?. A temperature to satisfy the zone requiring the coolest air. No bleed air pressure to the Left pack. A temperature to satisfy the flight deck.

Where is the bleed air from the Cargo Heat system discharged for Cargo compartment Heating?. into the cargo compartment. under the floor of the cargo compartment. along the outside wall of the compartment.

What is the position of the outflow valve after failure of both Auto Controllers?. It drives full open. It drives full closed. It remains in the last signaled position.

Cooling air circulation for the E/E components & cockpit instrument panels is produced by: Thermal circulation. A duct from the left pack. A supply and exhaust fan.

Where ist the smoke detector located for the FWD Equipment Cooling System?. Exhaust ducting. FWD E/E compartment. Supply ducting.

Pack High flow schedule is selected automatically if One pack off or inoperative in flight. TRUE. FALSE.

What is the "Scheduled" cabin altitude based on?. Take off field elevation vs landing elevation. A constant temperature differential. A constant pressure differential. Airplane flight altitude.

Which Equipment Cooling mode must be selected to arm the NO COOLING light. OVRD. STBY. AUTO.

Cabin ALT AUTO 2 status message appears in flight. What has occured?. Manual control of the outflow valve was established. Both automatic pressure controllers failed. Automatic control pressure 1 failed. Automatic control pressure 2 failed.

The Left pack INOP light comes on because the pack outlet temperature is too high. What happens to pack operation?. The Left pack is shut down. Left pack is set for maximum cooling. Right pack produces hi flow.

How do you recognize that the Equipment Cooling Bypass shutoff valve failed closed?. On the ground with OAT below 7.2C or both engines running , VALVE amber light illuminates and EICAS FWD EQPT VAL advisory message appears. On the ground with OAT below 7.2C or both engines running , VALVE amber light illuminates. EICAS FWD EQPT VAL advisory message appears. On the ground with OAT below 7.2C, VALVE amber light illuminates and EICAS FWD EQPT VAL advisory message appears.

What illuminates the PACK OFF light?. High air flow. ACM fan inoperative. Pack valve closed.

What cabin altitude initates a close signal to the outflow valve?. 14.000ft. 10.000ft. 9.500 ft. 11.000ft.

The purpose of recirculating cabin air is to maintain the desired level of passenger cabin ventilation while minimizing the use of bleed air (passenger aircraft). TRUE. FALSE.

The CABIN ALTITUDE light illuminates, to extinguish it, you must. Raise cabin altitude above 10.000ft. Reduce cabin altitude below 8.500ft. Reduce cabin altitude below 9.400ft.

Maximum allowable cabin pressure differential for T/O and Landing is: 350 ft below airport pressure / .125 psi. 500 ft below airport pressure / .175 psi. 350 ft above airport pressure / .125 psi. 236 ft below airport pressure / .125 psi.

What is the source of the filtered air for the recirculation fans? (passenger version acft). Forward cargo compartment. Passenger cabin and cockpit discharge air. Outside air.

What is the purpose of TRIM AIR?. Cools conditioned air to meet the zone temperature requirements. Heats conditioned air to meet the zone temperature requirements. Controls pack temperature.

What could produce an all 3 zone temperature INOP lights. Turning off the TRIM AIR. A trim air controller fault. Turning off the TRIM AIR or a TRIM AIR controller fault. A L pack + trim air controller fault.

If the PACKs are turned OFF for Take off, what produces circulation of air in the airplane?. Ram air pressure. No circulation is available. Recirculation fans.

Where is the reset function for a pack located?. Reset is automatic. Pack overheat does not require a reset. in the Pack off/INOP light. in the Pack mode selector switch.

During automatic temperature control, which temperature zone controls the output of the Air conditioning packs?. the zone requiring the coolest air. the zone with the warmest section. the zone requiring the warmest air.

What type of power is used for outflow valve actuation during auto control?. DC and AC. DC. AC.

What can cause a compartment temperature INOP light to come ON?. Excessive pack outlet temperature or controller fault. Excessive internal pack temp loss of air pressure. Excessive duct temp or control system fault of passenger temperature control switch OFF or Trim air switch OFF.

What condition turns the equipment cooling VALVE light ON?. Equipment cooling valve incorrectly positioned. No airflow in the equipment cooling system. Overheat in the equipment cooling system.

When the Auto Rate is positioned at the index, what limit is set for Cabin rate of descent?. 100 fpm. 300 fpm. 500 fpm. 600 fpm.

What does the Automatic controller compare when Cruise mode is established?. Selected cruise altitude and selected landing altitude. Take off altitude and selected landing altitude. Scheduled cabin altitude and selected landing altitude.

EICAS indicates CABIN ALTITUDE red warning message + CABIN ALTITUDE red light. What happens to the outflow valve under these conditions?. It remains in position and a positive relief valve opens to discharge cabin air overboard. It opens and locks in position until the cabin altitude has climbed to 14.500ft. It remains locked in position until manual control is established. It closes and locks in position until the cabin altitude has descended below 9.500ft.

Differential pressure is 9.1 psi. How does the pressurization system respond?. It opens both negtive pressure relief valves inward to allow air into the pressurized compartments. It closes both positive pressure relief valves to increase the cabin pressure. It closes the outflow valve until manual control is established. It opens both positive pressure relief valves outward to discharge cabin air overboard.

When is the Alternate Auto Controller self-tested?. After landing. After engine start. During cruise.

What AUTO RATE limit is set for climb and descent when the knob is set at the index mark?. Climb 300 fpm and descent 500 fpm. Climb 300 fpm and descent 300 fpm. Climb 500 fpm and descent 300 fpm. Climb 500 fpm and descent 500 fpm.

What is the cabin altitude rate of change based on?. True airspeed. Landing altitude. Proportional to rate of climb. Selected cruise altitude.

What is the minimum Main deck cargo compartment temperature if the selector is set to perishable?. 2C / 35F. 5C / 41F. 7C / 45F.

What is the minimum Main deck cargo compartment temperature if the selector is set to Animal/Normal?. 15C / 59F. 18C / 65F. 20C / 68F.

Forward Cargo compartment temperature is displayed on status page. TRUE. FALSE.

Which statement best describes the Automatic Pressurization System?. A single automatic system controls a single outflow valve powered by one AC motor. A single automatic system controls a single outflow valve powered by two AC motors. Two independent automatic systems control a single outflow valve powered by two AC motors. Two independent automatic systems control two outflow valves powered by Two AC motors.

The average normal operating differential pressure is. 7.8 psi. 8.6 psi. 9.1 psi. 8.0 psi.

In the equipment cooling OVRD mode, what is the source of cooling air for the cockpit instrument and panels?. Ambient cockpit/electronics compartment air. Outside air. Skin heat exchanger.

In flight, How does the STBY position affect the equipment coling system?. Changes source of air to outside supply. Shuts off the airplane skin heat exchanger. Uses the supply fan instead of the exhaust fan.

Approximately, at what altitude is the maximum normal differential pressure of 8.6 psi reached?. 43.100 ft. 38.000 ft. 35.000 ft. 30.000 ft.

Altitude setting should be made on LDG ALT during cockpit preparation, What altitude do you set on the instrument?. Destination airport elevation. Cabin altitude as determined from placard. 200ft below take off airport elevation. Destination airport elevation minus 100 ft.

Automatic pressurization control for a flight requires selection of AUTO 1 or 2, desired AUTO RATE and setting of LDG ALT. TRUE. FALSE.

Can the APU bleed air be used for Cargo heat?. YES. NO.

During cruise, how much can the airplane climb before the cabin altitude begins to climb (enters in climb mode)?. 500 ft. 1000 ft. 800 ft. 300 ft.

The B767 has 3 Isolation valves to always provide a protected air source to the ADP (Air driven pump). TRUE. FALSE.

If cabin altitude exceeds 11.000ft the outflow valve will be closed by the: MANUAL system signal only. AUTO system signal only. Signals from both manual and auto are available.

Why are the L and R isolation valves normally closed during a flight?. To prevent a back flow of engine bleed air to the APU. To prevent a duct leak at the crossover manifold. To prevent a cross flow of bleed air between engines resulting from a difference in thrust.

Which valves isolate L pneumatic system from the R pneumatic system?. Left and Right isolation valves. Left and Right isolation valves and corresponding check valves. Left and Right isolation valves, corresponding check valves and the center isolation valve.

Which system will become inoperative if bleed air is not supplied to the center pneumatic duct?. Wing anti ice and fwd cargo heat. Pressurization to the Left and Right hydraulic reservoirs and potable water tank. ADP, Aft/bulk cargo heat and pressurization to the center hydraulic reservoir.

An engine bleed air OVHT light is illuminated, Which of the following is correct?. The bleed air will continue flowing until the engine bleed air switch is turned off. The engine bleed air valve (PRSOV) and HPSOV will automatically close, but the PRV will remain open for the engine anti ice and reverser system. The PRSOV, HPSOV and PRV automatically close.

Which statement below is INCORRECT when an engine BLEED light is illuminated?. The pressure of the engine bleed air is too low. The HPSOV is open when commanded to be closed. The PRV is open when commanded to be closed.

During automatic pack operation, the left pack INOP light is illuminated due to high pack outlet temperature. What will happen in he pack control system?. The left pack will be shut down. The left pack will continue to operate in a maximum cooling mode. The right pack will operate in a high flow mode.

How is the pack outlet temperature controlled when the pack control selector is in STBY N?. It is regulated to a constant and moderate temperature. It varies based on the demand from each zone. It is set to full cold operation.

What is the purpose of trim air?. To control the pack outlet temperature. To warm the conditioned air to provide the demanded zone temperature. To cool the conditioned air to provide the demanded zone temperature.

Which of the following will illuminate the compartment temperature INOP light?. An internal pack overheat or loss of air pressure. A pack outlet overheat or pack controller fault. Trim air switch OFF, compartment temperature control is OFF or Fault in temp zone controller.

If both automatic cabin pressure controllers (AUTO 1 and 2) become inoperative, what happens to the outflow valve?. Moves to fully open. It freezes in the last commanded position. Moves to fully closed.

The cabin altitude AUTO INOP light illuminates while using AUTO1, How can the AUTO INOP light be extinguished?. The light cannot be extinguished. By selecting MAN. By selecting AUTO2.

When a Duct leak occurs the QRH procedure command the wing anti ice to be switched off, why?. To prevent further escape of hot air. Because wing anti Ice is inoperative. To prevent asymmetrical ice buildup on the wings.

During cruise that airplane altitude change causes the pressurization system to re enter in climb mode?. More than 300’. More than 500’. More than 1000’.

When returning to the departure airport after take off, what should you set on the LDG ALT window?. Departure airport elevation. No action is required because the system has not entered in cruise mode. Departure airport elevation minus 100’.

What is the cooling air source for the equipment cooling system in its OVRD mode?. Outside air (Ram air). Skin heat exchanger. Conditioned air.

What will happen if the IFR raft takes off with the equipment cooling valve light illuminated (FWD EQPT VAL on EICAS)?. The skin heat exchanger becomes inoperative as all the associated valves will be closed. The aircraft may not be pressurized. Nothing happens because this is normal.

APU bleed air cannot be used for the cargo heat system. TRUE. FALSE.

How does the bulk cargo heat VENT mode operate (BDSF)?. It maintains the bulk compartment above 7*C using conditioned air. It maintains the bulk compartment at 7*C. It maintains the bulk compartment above 18*C using bleed air and activates a vent fan.