Air Systems Flashcards
When does the Equipment Cooling configure for flight?
With one or more engines on each wing operating.
On the ground, when is warm equipment cooling air ducted overboard? (3 Items)
Engines not Operating,
Equipment Cooling Selector in ‘NORM’, and
Warm ambient temperatures.
Equipment Cooling provides cooling air for what systems? (2 Items).
Flight Deck Instruments, and
Electronics and Equipment Racks.
How can you manually configure the Equipment Cooling system for flight?
Positioning the Equipment Cooling Selector to ‘STBY’.
What is the function of the Lower Lobe Cargo Conditioned Air Flow Rate Selector knob?
To provide airflow and conditioned air to the lower cargo lobes.
What happens when a fault is detected in a Pack Temperature Controller (PTC)?
Control of the respective pack(s) revert to the operational PTC.
How many PTC’s are there?
- A & B.
On the 747-8, with the Main Deck and FWD & AFT lower lobe temperature selectors set to ‘OFF’ what is the temperature zone target?
20 deg C (68 deg F).
On the 747-8, the Nitrogen Generation System (NGS) converts engine Bleed Air to Nitrogen Enriched Air for what purpose?
To reduce the flammability of fuel in the CWT.
On the 747-8, what is the purpose of the Alternate Ventilation system when all packs are off, and the aircraft is depressurized?
To provide ambient airflow to the flight Deck.
On the 747-8, what position are the ‘MAIN DECK FWD & AFT’ temperature selector switches normally placed in during preflight?
OFF.
On the 747-8, unless required, what position is the Lower Lobe Cargo Conditioned Air Flow Rate Selector switch placed in during preflight?
LOW.
On the 747-8, the ‘TEMP DEV CARGO LO (HI)’ EICAS Message indicates what?
Temperature deviations of +/- 5°C (9°F).
On the 747-8, what temperature in the LO and HI position will the Lower Lobe AFT CARGO HEAT maintain?
LO = 4°C (40°F).
HI = 10°C (50°F).
The 747-8 ECS Left & Right Trim Air provides airflow to which zones?
Left = Flight Deck, Upper Deck, Crew Rest, AFT Main Deck.
Right = FWD Main Deck, FWD LL, AFT LL.
In decent mode, upon landing, will the Cabin Altitude Controllers (CAC’s) provide a positive or negative pressure inside the aircraft?
Upon landing, the CAC’s will command a slight positive pressure to ensure doors can be opened in the event of an evacuation.
What action would allow manual operaton of the pressurization system?
Turning both Outflow MAN switches ON
(This bypasses all Cabin Pressurization Protections).
When do the CAC’s switch to the secondary CAC? (2 Items)
Automatically upon touchdown, and
In the event of a CAC failure.
How many CAC’s does the 747 have?
- A & B.
How can you gain manual control of the landing altitude?
By selecting the LANDING ALT switch.
What does the Zone SYS Fault light indicate? (3 Items)
Zone Duct overheat or fault detected, or,
Master Trim Air Valve failed closed, or,
Master Trim Air Valve closed and pack air continues to flow.
When is HP Bleed Air used? (2 Items)
Descent, or,
Other low power setting operations.
How do you isolate a bleed duct section in the event a bleed duct leak is detected?
By following the QRH. It will direct you to close isolation valves, and/or engine Bleed valves.
What does a Bleed Duct ISLN VALVE (Amber) light indicate?
Isolation Valve position doesn’t agree with switch position.
When Bleed Air pressure is available, the ‘ENGINE BLEED’ switches control which valves by system logic? (3 Items)
HP Valve,
Engine Bleed Valve, and
PRV
Describe the basic function of the PRV.
To reduce the pressure of engine bleed air to prevent damage to ducting and equipment downstream.
Under what conditions would Intermediate Pressure (IP) bleed air be used?
During situations requiring high power settings.
With a right duct isolated, how would this affect the hydraulic systems? (2 Items)
Hydraulic Demand Pump 4 turned off (QRH Action), and
No reservoir pressure for Hydraulic systems 3 & 4.
With a right bleed duct isolated, how would the affected Leading Edge flaps extend?
Electrically, in secondary mode.
With the STARTER CUTOUT 1, 2, 3, 4 EICAS Message shown, would NAI be available?
No.
With the STARTER CUTOUT 1, 2, 3, 4 EICAS Message shown, would NAI be available?
No.
