Air Systems Flashcards
On the ground an external air source can supply conditioned air directly into…
The left air conditioning manifold.
With the pack control selector in STBY-N the pack produces?
A constant moderate temperature (approx 75ºF/24ºC)
With the pack control selector in STBY-C the pack produces?
A full cold temp (65ºF/18ºC)
With the pack control selector in STBY-W the pack produces?
A full warm temp (85ºF/30ºC)
How are the ram air doors and the exhaust doors affected with the pack control selector in any STBY mode?
They sre fixed in the full open position.
The pack high flow system is automatic and is armed during normal opertation - T/F?
True.
If a pack overheat condition is detected, the respective pack cycles to..?
Max cooling.
If a pack fault condition is detected with the automatic pack control system, the respective pack valve will?
Remain in last controlled position.
A PACK OFF light indicates the pack valve is closed due to?
The selector is in the off position or a pack trip has occurred or loss of air to the pack.
INOP and a PACK OFF light can indicate?
An internal pack overheat.
Where is the overheat reset switch for a pack located?
In the INOP/PACK OFF light switch.
Conditioned air from the mix manifold is distributed to ______ temp controls zones on the B767-300P.
4
Which temp control zone does not have a temp indication on the B767-300?
FLT DK
Instead of a temp indication the FLT DK on the B767-300 has?
A valve position indicator.
Turning off the trim air switch will illuminate OFF in the switch and illuminate how many INOP lights on the B767-300?
4
If the selected automatic pressurization mode fails, what happens?
Alternate mode is automatically switched.
If automatic pressurization switching occurs during a mode failure, how is it displayed to the flight crew?
EICAS status msg.
What does AUTO INOP on the cabin altitude control panel mean?
Both auto controllers have failed, or manual mode has been selected.
What will the index mark on the cabin altitude auro rate control establish?
A climb of 500 FPM or descent of 300 FPM.
Where are the positive pressure relief valves located?
Left fuselage fwd of the wing.
When does the cabin Altitude Warning/Light illuiminate?
10,000’ Cabin Altitude.
The lower cargo area is divided into___ compartments?
3
Which cargo compartment/s utilize the center APU duct to supply warm air?
AFT and BULK
Where is the Bulk Cargo heat selector located?
Accessory panel.
The Bulk Cargo heat selector in vent position supplies warmer air and turns on a fan to improve circulation T/F?
True.
What is the function of the Bulk Cargo heat selector?
Allows a higher temperature to be selected for the Bulk compartment (Approx 65ºF)
The shoulder and foot heaters for each pilot only operate in flight T/F?
True.
When the aircraft is on the ground, circulation of cooling air for E/E components is normally produced by?
A supply and an exhaust fan.
A skin heat ex-changer is sometimes used to remove heat from the equipment cooling air and is controlled automatically, T/F?
True.
The valve light on the equipment cooling panel illuminates on the ground if?
One or more of the equipment cooling valves are not in the commanded position.
The valve light on the equipment cooling panel illuminates in flight if?
Overboard exhaust fuel valve is not closed.
What equipment cooling mode must be selected to arm the NO COOLING light?
OVRD.
If the DUCT LEAK light is illuminated, when will it extinguish?
When the temperature along the pneumatic duct cools.
The airplane is in climb through 20,000’ and pressurization is being controlled automatically, what is the cabin rate of climb based on?
If the max cabin differential pressure is reached, cabin climb rate becomes a function of airplane climb rate, while maintaining the max differential pressure.
The Trim Air switch is off. What cabin temperature do the packs attempt to maintain?
An average temperature of 75ºF (24ºC)
What does the pack INOP light indicate?
Excessive pack outlet temperature or controller fault.
During automatic control, which temperature zone controls the output of the airconditioning packs?
The zone requiring the coolest air.
Automatic pressurization control for flight requires selection of AUTO 1 or 2, desired AUTO RATE and setting of LDG ALT, T/F?
True.
What type of power is used for outflow valve actuation during normal control?
AC
Inflight, how does STBY position affect the equipment cooling air?
Uses the supply fan instead of the exhaust fan.
What does the equipment cooling NO COOLING light indicate?
No cooling airflow through the E/E compartment.
What equipment cooling situation causes the ground crew call horn to sound?
Equipment cooling overheat.
Where is the bleed air from the Cargo Heat system discharged for the cargo compartment heating?
Under the floor of the cargo compartment.
With the Master Trim Air Switch off, are the zone temperature controls regulating temperature?
No.
Why is recirculated air used for air conditioning?
To reduce bleed air requirements.
What is the purpose of trim air?
Heats conditioned air to meet the zone temperature requirements.
What occurs after cabin zone temperature is turned off?
Zone trim air is lost and the INOP light stays on.
When all zone temperature INOP lights are on, what cabin temperature will the packs maintain?
An average temperature of 75ºF (24ºC)
If the packs are turned off for takeoff, what produces circulation of air in the pax airplane?
Recirculation fans.
The CABIN ALTITUDE light illuminates. To extinguish it you must..?
Reduce cabin altitude below 8,500’.
What equipment cooling situation causes the ground crew horn to sound?
Equipment cooling overheat or OVRD is selected on the ground.
What does the automatic controller compare when cruise mode is established?
Scheduled cabin altitude and selected landing altitude
What is max normal operating differential pressure?
8.6psi
The SMOKE light comes on. You have determined the smoke is in the flight deck supply system. How is the smoke removed?
Through the overboard exhaust valve.
Which isolation valve must be open to allow the flow of APU bleed air into the manifold?
C ISLN
When are the L and R isolation valves normally closed?
After engine start.
What does it mean when the isolation valve light comes on?
Valve and switch position are not in agreement.
Which of the following valves isolate the L and R pneumatic system?
L and R isolation valves and associated check valves.
What is indicated if a L or R DUCT LEAK light is on?
A pneumatic duct leak.
What indication do you see if there is a bleed air leak in the manifold?
DUCT LEAK light illuminated.
If the DUCT LEAK light is on, when will it go out?
When the temperature along the pneumatic duct cools.
What is indicated if either the L or R DUCT LEAK light stays on after the duct leak procedural steps have been completed?
A leak in the crossover manifold.
What causes a center DUCT LEAK light to illuminate?
Center pneumatic duct leak.
Which systems become inoperative when bleed air is prevented from entering the center pneumatic duct?
ADP and AFT/BULK cargo heat.
Which valves MUST be open to start the left engine using a ground air cart?
Starter only.
The Air Driven Hydraulic Pump, and the Aft Cargo Compartment use bleed air delivered through the center pneumatic duct, T/F?
True
With the L isolation valve open, what source can supply air to the L pneumatic duct?
Ground supply, APU and both engines.
What does BLEED light indicate? (GE)
High pressure shut off valve and/or pressure regulating valves are open when they should be closed.
What does BLEED light indicate? (PW)
Engine high pressure valve open when it should be closed.
What is the problem with the left DUCT LEAK light illuminated?
Leak in left wing duct.
With the APU operating, and both isolation valves open, which air conditioning pack can be supplied?
Left and right packs.
With the APU operating, what is the position of the APU bleed air valve?
Open.
What must be done if a temperature below 45ºF is desired with the Forward Cargo Air Conditioning System on the 767 freighter?
The Forward Cargo Heat must be selected OFF.
What are the electrical power sources for pressurization control?
Left AC for #1 automatic, Right AC for #2 automatic and standby DC for manual.
How many cabin altitude auto controllers are provided?
Two controllers, AUTO 1 and AUTO 2
