Study Guide: Air Systems FM 6.20

Question 1

1) 757: The ISOLATION VALVE light is illuminated. What does this indicate?
a) The isolation valve has overheated
b) The isolation valve is open
c) The isolation valve is not in the commanded position
d) The isolation valve has sensed an overpressure

Answer 1

c) The isolation valve is not in the commanded position

Question 2

2) 757: The right DUCT LEAK light is illuminated. What does this indicate?
a) The engine bleed system pressure is excessive
b) A high temperature bleed air leak is detected
c) A bleed air leak in the engine anti-ice duct is detected
d) Overpressure is detected in either wing anti-ice duct

Answer 2

b) A high temperature bleed air leak is detected

Question 3

3) 757: The right engine BLEED AIR OFF light is illuminated. What is the position of the
right engine bleed air valve?
a) Closed
b) In transit
c) Open
d) Unable to be determined using the graphic

Answer 3

a) Closed

Question 4

4) 757: The right engine BLEED light is illuminated. What does this indicate?
a) The right engine bleed air valve is failed close
b) The right engine high pressure valve is open at low engine thrust
c) The right engine low pressure valve is closed
d) The right engine bleed air temperature is excessive

Answer 4

d) The right engine bleed air temperature is excessive

Question 5

5) 757: The APU BLEED AIR VALVE light is illuminated and EICAS advisory message APU
BLEED VAL is displayed. What does this indicate?
a) The APU bleed air valve is open
b) The APU bleed air valve is closed
c) The APU bleed air valve is operating normally
d) The APU bleed air valve is not in the commanded position

Answer 5

d) 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?
a) An engine bleed air overheat
b) A high temperature bleed air leak is detected
c) The HPSOV and/or PRV valve has failed in the full open position
d) The engine bleed system pressure is excessive

Answer 6

a) An engine bleed air overheat

Question 7

7) 757/767: The engine bleed air valves (pressure regulating and shut off valve [PRSOV])
are __________________.
a) Electrically controlled and pressure actuated
b) Pressure controlled and pressure actuated
c) Pressure controlled and electrically actuated
d) Electrically controlled and electrically actuated

Answer 7

a) Electrically controlled and pressure actuated

Question 8

8) 757: The left engine HI STAGE light is illuminated. What does this indicate?
a) The left engine bleed system temperature is excessive and the engine high
pressure bleed air valve is automatically locked open
b) The left engine bleed system temperature is excessive and the engine high
pressure bleed air valve is automatically locked closed
c) The left engine bleed system pressure is excessive and the engine high pressure
bleed air valve is automatically locked open
d) The left engine bleed system pressure is excessive and the engine high pressure
bleed air valve is automatically locked closed

Answer 8

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

Question 9

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?
a) The AUTO INOP light illuminates
b) Cabin altitude automatically descends to 4000 feet
c) Control is automatically switched to the MAN controller
d) Control is automatically switched to the AUTO 1 controller

Answer 9

d) Control is automatically switched to the AUTO 1 controller

Question 10

10) 757/767: On the ground, when does the pressurization system begin pressurizing the
aircraft?
a) When the airplane passes 400 feet RA
b) When the airplane passes 50 feet RA
c) When the throttles are advanced for the takeoff
d) At nose strut extension plus 20 seconds or 400 feet RA, whichever occurs first

Answer 10

c) When the throttles are advanced for the takeoff

Question 11

11) 757/767: The AUTO INOP light is illuminated. According to the graphic, what could
cause this?
a) AUTO 2 is inoperative
b) AUTO 1 is inoperative
c) The AUTO RATE knob was moved beyond the index mark
d) Both AUTO controllers have failed

Answer 11

d) Both AUTO controllers have failed

Question 12

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.
a) 1000, 300
b) 800, 300
c) 600, 400
d) 500, 300

Answer 12

d) 500, 300

Question 13

13) 757/767: What will occur if the selected (AUTO 1 or AUTO 2) pressurization controller
fails?
a) Control is automatically switched to the other controller
b) Cabin altitude automatically descends to 4000 feet
c) Control is automatically switched to the MAN controller
d) The AUTO INOP light illuminates

Answer 13

a) Control is automatically switched to the other controller

Question 14

14) 757/767: If a return to the departure airport is necessary, how must the crew set the
pressurization system?
a) The MAN position must be selected on the controller and manual operation used
for landing
b) The opposite AUTO position used for takeoff must be selected
c) The AUTO RATE knob must be moved to the index position for landing
d) The landing altitude must be reset for return to the departure airport

Answer 14

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

Question 15

15) 757/767: On the cabin altitude control panel, the AUTO INOP light is illuminated. What
can cause this?
a) The AUTO RATE knob is moved beyond the index mark
b) AUTO 1 is inoperative
c) MODE SELECT switch is in MAN
d) AUTO 2 is inoperative

Answer 15

c) MODE SELECT switch is in MAN

Question 16

16) 753/767: The aircraft is divided into ___ temperature zones.
a) 4
b) 2
c) 3
d) 5

Answer 16

a) 4

Question 17

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:
a) An electric heater in the duct downstream of the fan
b) Air from the FWD cargo compartment
c) A pneumatic heat fan
d) Discharge air from the FWD equipment

Answer 17

a) An electric heater in the duct downstream of the fan

Question 18

18) 757/767: The FWD CAB compartment temperature INOP light is illuminated. What is a
possible cause for it’s illumination?
a) Fault or overheat in the zone temperature controller
b) The associated accessory panel switch is in the TEST position
c) The left recirculation fan is off or inoperative
d) The right recirculation fan is off or inoperative

Answer 18

a) Fault or overheat in the zone temperature controller

Question 19

19) 757/767: If there were to be excessive pack outlet temperature, which light would
illuminate?
a) INOP only
b) PACK OFF only
c) TRIM AIR
d) PACK OFF and INOP

Answer 19

a) INOP only

Question 20

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?
a) High temperature detected in the forward E/E compartment
b) Low airflow detected in the forward equipment cooling system on the ground
c) Pressing the EQUIP COOLING switch to the ALTN position
d) The overboard exhaust valve opens

Answer 20

c) Pressing the EQUIP COOLING switch to the ALTN position

Question 21

21) 767: The EICAS advisory message FWD EQPT SMOKE displays and ________ if
smoke is sensed in the forward equipment cooling exhaust duct.
a) The SMOKE light illuminates
b) The packs switch to high flow
c) The cooling system automatically reconfigures
d) The overboard exhaust valve opens

Answer 21

a) The SMOKE light illuminates

Question 22

22) 767: The equipment cooling system VALVE light is illuminated. What is a possible cause
for it’s illumination?
a) There is no cooling air in the equipment cooling system
b) Smoke has been detected in the forward equipment cooling ducts
c) There is an overheat in the forward equipment cooling system
d) One or more forward equipment cooling supply or exhaust valves are not in their
commanded position after engines are started

Answer 22

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

Question 23

23) 767: The equipment cooling system OVHT light is illuminated. What caused it’s
illumination?
a) There is low airflow or high temperature sensed
b) There is high air pressure sensed
c) There is high airflow sensed
d) Smoke has been detected

Answer 23

a) There is low airflow or high temperature sensed

Question 24

24) 767: The equipment cooling system NO COOLING light is illuminated. What position
must the EQUIP COOLING selector switch be in?
a) AUTO
b) OVRD
c) STBY
d) Any position

Answer 24

b) OVRD

Question 25

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?
a) No, only the PACK OFF light should be illuminated
b) Yes, but the TRIM AIR OFF light should also be illuminated
c) No, only the pack INOP light should be illuminated
d) Yes, the INOP and PACK OFF lights should be illuminated

Answer 25

d) Yes, the INOP and PACK OFF lights should be illuminated

Question 26

26) 757/767: If you position one of the compartment temperature control knobs to the OFF
position, what will happen?
a) The associated compartment INOP light will illuminate
b) The packs will produce maximum cooling
c) Trim air will be lost to all zones
d) The packs will revert to the STBY mode

Answer 26

a) The associated compartment INOP light will illuminate

Question 27

27) 757/767: If the pack automatic control system were to fail, what would be indicated?
a) PACK OFF and INOP lights
b) A PACK OFF light only
c) The TRIM AIR light
d) The INOP light only

Answer 27

d) The INOP light only

Question 28

28) 757/767: The high flow schedule is automatically activated to provide higher-than-normal
air flow when:
a) The selector is positioned to high flow
b) Trim Air is removed
c) One pack is inoperative
d) External conditioned air is connected

Answer 28

c) One pack is inoperative

Question 29

29) 757/767: On the ground, what would cause the high flow schedule to be automatically
activated for both packs during single-engine taxi?
a) High ambient air temperature
b) Selecting STBY mode
c) APU supplying air to both packs
d) Closing APU bleed air valve

Answer 29

c) APU supplying air to both packs

Question 30

30) 757: High flow to the opposite pack is inhibited when:
a) Ground air is connected
b) The RPM of either engine falls below a preset value
c) The associated recirculation fan is turned off
d) Associated engine bleed air switch is off

Answer 30

b) The RPM of either engine falls below a preset value

Question 31

31) 757/767: What will the pack do when both the INOP and PACK OFF lights illuminate?
a) Shut down
b) Activate high flow schedule
c) Operate in a degraded mode
d) Open the pack valve

Answer 31

a) Shut down