Study Guide: Air Systems

Question 1

757: The ISOLATION VALVE light is illuminated. What does this indicate?

Answer 1

The isolation valve is not in the commanded position

Question 2

757: The right DUCT LEAK light is illuminated. What does this indicate?

Answer 2

A high temperature bleed air leak is detected

Question 3

757: The right engine BLEED AIR OFF light is illuminated. What is the position of the right engine bleed air valve?

Answer 3

Closed

Question 4

757: The right engine BLEED light is illuminated. What does this indicate?

Answer 4

The right engine bleed air temperature is excessive

Question 5

757: The APU BLEED AIR VALVE light is illuminated and EICAS advisory message APU BLEED VAL is displayed. What does this indicate?

Answer 5

The APU bleed air valve is not in the commanded position

Question 6

767: The right engine bleed air overheat (OVHT) light is illuminated. What does this indicate?

Answer 6

An engine bleed air overheat

Question 7

757/767: The engine bleed air valves (pressure regulating and shut off valve [PRSOV]) are __________________.

Answer 7

Electrically controlled and pressure actuated

Question 8

757: The left engine HI STAGE light is illuminated. What does this indicate?

Answer 8

The left engine bleed system pressure is excessive and the engine high pressure bleed air valve is automatically locked closed

Question 9

757/767: The pressurization system is in the automatic mode when the cabin altitude mode selector is set to AUTO 1 or AUTO 2. According to the graphic, what would the
pressurization system do if the AUTO 2 controller were to fail?

Answer 9

Control is automatically switched to the AUTO 1 controller

Question 10

757/767: On the ground, when does the pressurization system begin pressurizing the aircraft?

Answer 10

When the throttles are advanced for the takeoff

Question 11

757/767: The AUTO INOP light is illuminated. According to the graphic, what could cause this?

Answer 11

Both AUTO controllers have failed

Question 12

757/767: The AUTO RATE knob sets limit for cabin altitude rate of climb or descent when mode selector is in AUTO 1 and AUTO 2 modes. Index mark establishes approximately ___ FPM climb and ___ FPM descent limits.

Answer 12

500, 300

Question 13

757/767: What will occur if the selected (AUTO 1 or AUTO 2) pressurization controller
fails?

Answer 13

Control is automatically switched to the other controller

Question 14

757/767: If a return to the departure airport is necessary, how must the crew set the pressurization system?

Answer 14

The landing altitude must be reset for return to the departure airport

Question 15

757/767: On the cabin altitude control panel, the AUTO INOP light is illuminated. What can cause this?

Answer 15

MODE SELECT switch is in MAN

Question 16

The aircraft is divided into ___ temperature zones.

Answer 16

4

Question 17

757: The two cargo compartments are heated by discharge air that flows along the outside walls of the compartment. When supplemental heating of the aft cargo compartment is required, it is accomplished by:

Answer 17

An electric heater in the duct downstream of the fan

Question 18

757/767: The FWD CAB compartment temperature INOP light is illuminated. What is a
possible cause for it’s illumination?

Answer 18

Fault or overheat in the zone temperature controller

Question 19

757/767: If there were to be excessive pack outlet temperature, which light would illuminate?

Answer 19

INOP only

Question 20

757: Air is circulated through the forward E/E racks by one of two supply fans. If the operating fan fails, what starts the alternate fan?

Answer 20

Pressing the EQUIP COOLING switch to the ALTN position

Question 21

767: The EICAS advisory message FWD EQPT SMOKE displays and ________ if smoke is sensed in the forward equipment cooling exhaust duct.

Answer 21

The SMOKE light illuminates

Question 22

767: The equipment cooling system VALVE light is illuminated. What is a possible cause for it’s illumination?

Answer 22

One or more forward equipment cooling supply or exhaust valves are not in their commanded position after engines are started

Question 23

767: The equipment cooling system OVHT light is illuminated. What caused it’s illumination?

Answer 23

There is low airflow or high temperature sensed

Question 24

767: The equipment cooling system NO COOLING light is illuminated. What position must the EQUIP COOLING selector switch be in?

Answer 24

OVRD

Question 25

757/767: The R PACK has shut down due to compressor temperature exceedance. Both the pack INOP and PACK OFF lights are illuminated. Is that the correct indication?

Answer 25

Yes, the INOP and PACK OFF lights should be illuminated

Question 26

757/767: If you position one of the compartment temperature control knobs to the OFF position, what will happen?

Answer 26

The associated compartment INOP light will illuminate

Question 27

757/767: If the pack automatic control system were to fail, what would be indicated?

Answer 27

The INOP light only

Question 28

757/767: The high flow schedule is automatically activated to provide higher-than-normal air flow when:

Answer 28

One pack is inoperative

Question 29

757/767: On the ground, what would cause the high flow schedule to be automatically activated for both packs during single-engine taxi?

Answer 29

APU supplying air to both packs

Question 30

757: High flow to the opposite pack is inhibited when:

Answer 30

The RPM of either engine falls below a preset value

Question 31

757/767: What will the pack do when both the INOP and PACK OFF lights illuminate?

Answer 31

Shut down