Study Guide: Air Systems Flashcards
757: The ISOLATION VALVE light is illuminated. What does this indicate?
The isolation valve is not in the commanded position
757: The right DUCT LEAK light is illuminated. What does this indicate?
A high temperature bleed air leak is detected
757: The right engine BLEED AIR OFF light is illuminated. What is the position of the right engine bleed air valve?
Closed
757: The right engine BLEED light is illuminated. What does this indicate?
The right engine bleed air temperature is excessive
757: The APU BLEED AIR VALVE light is illuminated and EICAS advisory message APU BLEED VAL is displayed. What does this indicate?
The APU bleed air valve is not in the commanded position
767: The right engine bleed air overheat (OVHT) light is illuminated. What does this indicate?
An engine bleed air overheat
757/767: The engine bleed air valves (pressure regulating and shut off valve [PRSOV]) are __________________.
Electrically controlled and pressure actuated
757: The left engine HI STAGE light is illuminated. What does this indicate?
The left engine bleed system pressure is excessive and the engine high pressure bleed air valve is automatically locked closed
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?
Control is automatically switched to the AUTO 1 controller
757/767: On the ground, when does the pressurization system begin pressurizing the aircraft?
When the throttles are advanced for the takeoff
757/767: The AUTO INOP light is illuminated. According to the graphic, what could cause this?
Both AUTO controllers have failed
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.
500, 300
757/767: What will occur if the selected (AUTO 1 or AUTO 2) pressurization controller
fails?
Control is automatically switched to the other controller
757/767: If a return to the departure airport is necessary, how must the crew set the pressurization system?
The landing altitude must be reset for return to the departure airport
757/767: On the cabin altitude control panel, the AUTO INOP light is illuminated. What can cause this?
MODE SELECT switch is in MAN
The aircraft is divided into ___ temperature zones.
4
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:
An electric heater in the duct downstream of the fan
757/767: The FWD CAB compartment temperature INOP light is illuminated. What is a
possible cause for it’s illumination?
Fault or overheat in the zone temperature controller
757/767: If there were to be excessive pack outlet temperature, which light would illuminate?
INOP only
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?
Pressing the EQUIP COOLING switch to the ALTN position
767: The EICAS advisory message FWD EQPT SMOKE displays and ________ if smoke is sensed in the forward equipment cooling exhaust duct.
The SMOKE light illuminates
767: The equipment cooling system VALVE light is illuminated. What is a possible cause for it’s illumination?
One or more forward equipment cooling supply or exhaust valves are not in their commanded position after engines are started
767: The equipment cooling system OVHT light is illuminated. What caused it’s illumination?
There is low airflow or high temperature sensed
767: The equipment cooling system NO COOLING light is illuminated. What position must the EQUIP COOLING selector switch be in?
OVRD
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?
Yes, the INOP and PACK OFF lights should be illuminated
757/767: If you position one of the compartment temperature control knobs to the OFF position, what will happen?
The associated compartment INOP light will illuminate
757/767: If the pack automatic control system were to fail, what would be indicated?
The INOP light only
757/767: The high flow schedule is automatically activated to provide higher-than-normal air flow when:
One pack is inoperative
757/767: On the ground, what would cause the high flow schedule to be automatically activated for both packs during single-engine taxi?
APU supplying air to both packs
757: High flow to the opposite pack is inhibited when:
The RPM of either engine falls below a preset value
757/767: What will the pack do when both the INOP and PACK OFF lights illuminate?
Shut down
