Environmental Systems Flashcards
When can you use the electric heaters?
Only on the ground with a GPU
When can you use wing anti-ice on the ground?
Preflight and landing roll out.
When should you not operate engine anti-ice on the ground except for the preflight test?
OAT/SAT exceeds 10 deg C
When must engine anti-ice be ON for taxi and takeoff?
When in visible moisture at 5 deg C or colder
List three instances when the load shed controller will automatically shut off the VCCS?
1-Engine Start
2-When using windshield deice
3-When using horizontal stabilizer anti-ice/deice
Which VCCS component removes heat from the refrigerant following compression?
Condenser/heat exchanger
Placing the AUX TEMP CONTROL rotary switch to what position applies power to the VCCS?
AUX COOL
How is air temperature controlled with the AUX TEMP CONTROL switch in the ELEC HEAT 1 position?
Air temperature can’t be controlled by the crew when using the electric heat subsystem. The air temperature is automatically maintained at 120-150 deg F at the outlet
In which BLEED AIR switch positions will ACU cooling air be provided to the flight deck?
1-L ENG
2-R ENG
3-NORM
4-HIGH
In which mode switch position will sensors on the flightdeck be used to help maintain a constant flight deck temperature?
AUTO FLDK
Where is the ACU located?
In the forward position of the aft compartment
What are the indications bleed air has switched to emergency?
AIR COND FAIL annunciator illuminates and MASTER CAUTION
Pressing what switch provides additional cooling air into the aft portion of the cabin?
Cabin Outlet Switch
Under normal conditions, how is the T-1A cabin pressurized?
Airflow from the ACU
What does pulling the Cabin Dump T-handle do?
Depressurizes the cabin by bypassing the backup pressure regulator and opening the right outlfow valve.
When will the CABIN PRESSURE HI annunciator illuminate?
11+-1 psid
When does the CABIN PRESSURE LO annunciator illuminate?
cabin altitude exceeds 9500+-500 feet
What is the purpose of the VCCS?
The only source of cooling air when the aircraft’s engines are not operating
Below what temperature will the VCCS automatically not operate?
Below 20 deg F
What provides heating for the engine anti-ice system?
Bleed air
How can you be sure wing anti-ice system has fail?
N2>70% and WG ICE TEMP LO
Do not operate engine anti-ice system on the ground, except for preflight when above what temperature?
10 deg C
What should you do to avoid exceeding ITT limits prior to turning on engine or wing anti-ice?
Momentarily reduce throttles to a max of 90% N1
If ice is present, turn on the ______ switches prior to turning on the systems.
ignition
Do not operate anti-ice/deice systems at a RAT greater than what, unless in actual icing conditions?
10 deg C
If you encounter icing conditions during flight, use no greater than what degree of flaps?
10 degrees, unless in icing conditions for less than 10 minutes, and RAT during each encounter is warmer than -8 deg C or a RAT of +10 deg C is observed during descent, approach, landing.
When is windshield heat required?
When cruising about 18,000 feet
What does using the HIGH setting of windshield heat do?
Cause erratic and unreliable magnetic compass readings at any time, and is prohibited during takeoff and landing due to possible windshield distortion
If the horizontal stab anti-ice and deice fail, you should not use more than how many degrees of flaps?
10 degrees
What does it mean if the green blowout disk on the right side of the nose section is missing?
It means the oxygen cylinder has overpressurized to approximately 2700 psi, and the entire oxygen supply has been vented overboard
What is the recommended throttle setting if you’ve encountered icing?
90 % N1
