Air Systems Flashcards
When does equipment cooling system configure for flight?
One or more engines on each wing operating
On the ground, when is warm equipment cooling air ducted overboard?
-Engines not operating
-Equip cooling selector in NORM
-Ambient temp moderate or high
Equipment cooling provides cooling air for what compartment and systems?
-Flight deck equipment
-Electrical and equipment racks (E&E)
How can you manually configure the equipment cooling system for flight?
Selector - STBY
What is the function of the LOWER LOBE CONDITIONED AIR FLOW RATE selector?
Provides fwd and aft cargo lobe conditioned air
What happens if a pack temperature controller (PTC) detects a fault in a pack channel?
Control of pack switches to other PTC
How many pack temperature controllers (PTC) are provided?
Two, A & B
On the -8 with Main Deck and FWD/AFT lower lobe temperature selector in the OFF position, what is the temp zone target?
68F / 20C
747-8, Nitrogen Generation System converts bleed air to nitrogen enriched air for what purpose?
Reduce flammability of CWT fuel
On the -8, what does the alternate ventilation system provide with pack 1+2+3 shutdown and the airplane depressurized?
outside air to the flight deck
On the -8, what position are the MAIN DECK FWD and AFT TEMP selectors normally place in during preflight?
OFF
On the -8, what position is the LOWER LOBE AFT CARGO HT selectors normally placed in during preflight?
Low
On the -8, the TEMP DEV CGO advisory message HI or LO respectively indicate?
HI: 9F / 5C higher than selected temp
LOW: “”-“” lower than selected temp
On the -8 Lower Lobe Aft Cargo Heat Selector regulates temperature control valve to maintain at least:
____F/____C in LOW
&
____F/____C in HIGH
40F / 4C LOW
50F / 10C HIGH
The -8 ECS Left and Right trim air is providced to which temperature zones?
Left Trim Air:
-Flt Deck
-Upper Deck
-Crew Rest
-Aft Main Deck
Right Trim Air:
-Fwd Main deck
-Fwd Lower Lobe
-Aft Lower lobe
When in the descent mode, will the cabin altitude controllers program a positive or negative pressurization at touchdown?
Small positive pressurization at touchdown
What action would allow manual operation of the pressurization system?
Turn both outflow manual switches to ON
All automatic cabin altitude control functions are bypassed
When does the cabin altitude controller switch controllers?
-Automatically selects A or B on alternate flights
-Automatically switches if other fails
How many cabin altitude controllers are provided?
Two, A and B, both control both outflow valves
How can you gain manual control of the landing altitude?
By pushing the (LDG ALT) switch
Set by rotating Landing Alt Selector
MAN displayed on primary EICAS
EICAS advisory message LANDING ALTITUDE displayed
What does the Zone System (SYS) Fault Light indicate?
1)Temp Zone Duct Overheat or ZTC fault has occurred
2)Master trim air valve failed closed
3)Master trim air valve closed and pack air continues to flow
Under what conditions would High Pressure (HP) air be used?
Descent
Other low power setting operations
How would you isolate a bleed air duct secetion in the event a bleed duct leak is detected?
-Close respective isolation valve
-Close engine bleed air valves
What does a bleed duct isolation (ISLN) VALVE light indicate?
Isolation valve position disagrees with switch position
When bleed air pressure is available the Engine Bleed Air Switches control which valves by system logic?
PRV
HP Bleed Valve
Engine Bleed Air Valve
Describe the general function of pressure regulating valve (PRV)
Prevents damage to ducting and equipment downstream by limiting bleed air pressure
Under what conditions would intermediate pressure (IP) be used?
High power setting operations
With a right duct isolated, how will this affect hydraulic systems
-Hydraulic demand pump 4 off
-No hydraulic system 3 and 4 reservoir pressure
With ECAS message STARTER CUTOUT 1,2,3,4 shown, will NAI be available for the related engine?
NO
With a right duct isolated, how will the affected leading edge flaps extend?
Right wing LEF electronically in secondary mode, expect EICAS - FLAPS PRIMARY
