SY208/209 Environmental 1&2 Flashcards
Cockpit air conditioning and avionics cooling is supplied by an _______-_______ _______ ________ system.
engine-driven vapor cycle system.
(This is a separate system that does not use engine bleed air. It draws in cockpit air, cools it, and discharges it back into the cockpit.)
The engine supplies bleed air for (5):
Left Port: OBOGS
Right Port: Heat, Defog, Pressurization, Anti-G
Electrical power for the environmental control panel is provided through a circuit breaker labeled CKPT TEMP on the ________ bus.
generator
What activates the blower on the ground?
weight-on-wheels switch
The RAM AIR FLOW switch is overridden and the fresh air valve is closed when the aircraft reaches an altitude of about _____ MSL and the pressurization system begins to operate
8000’
The position of the inflow valve determines how much bleed air is supplied to the environmental system and is controlled by a _____ _____ _____ switch on the environmental control panel.
BLEED AIR INFLOW
The TEMP CONTROL switch operates the motor-driven _____ ______ _____ valve.
heat exchanger bypass
The environmental system automatically controls cockpit temperature between ___º and ___º F using inputs from the TEMP CONTROL switch and temperature sensors.
If the duct temperature exceeds ____º at any time, the heat exchanger bypass valve is closed and maximum bleed air is forced through the heat exchanger.
60-90º F
165º F
The temperature switch in the duct near the firewall shutoff valve and the switch at the aft defog control valve will light the DUCT TEMP annunciator if the inflow air temerature exceeds ____º F
300º
Electrical power for the inflow system is provided by a circuit breaker labeled INFLOW SYS on the front cockpit ________ bus
battery
What is the bi-level flow control bypass valve and how is it activated?
Also known as the defog valve, it provides a higher volume of bleed air flow to the system.
What is the heating system ejector?
A venturi device the draws in ambient cockpit air. It enables the bleed air to be ventilated to the defog ducts at a higher volume.
The air conditioning blowers will produce airflow at up to _____ cubic feet per min at the HI setting.
350
Power for the air conditioning system is provided through a circuit breaker labeled AIR COND on the _____ bus
generator
A panel in the _______ side of the fuselage allows access for Mx personnel to recharge the system refrigerant when necessary.
forward right
Which switch controls the position of the fresh air valve?
RAM AIR FLOW
A ______ _______ regulator in the aft pressure bulkhead monitors the cockpit pressure and automatically adjusts the position of the _________ _________ valve
control valve regulator
pressurization control valve
The cockpit differential pressure is monitored by a ______ __ regulator also located in the aft pressure bulkhead.
If the differential pressure exceeds 4.0 psi, the regulator sends a signal to the _______ valve.
delta P
safety valve
The DUMP position on the PRESSURIZATION switch on the environmental control panel terminates electrical power to the _____ _______ which allows the pressurization control valve to open and depressurize the cockpit.
dump solenoid
What does the RAM/DUMP switch do?
Terminates power to the dump solenoid to depressurize the cockpit and
Allows ram air into the cockpit
A safety valve in the flow line of the ANTI-G VALVE automatically relieves system pressure if it exceeds ___ psi.
7 psi
What is the purpose of the anti-suffocation valve?
Allows the pilot to continue breathing ambient cockpit air if OBOGS should fail
What causes the red OBOGS FAIL annunciator to illuminate?
When the low pressure switch is closed
What causes the amber OBOGS TEMP annunciator to illuminate?
OBOGS ducting temperature exceeds 200º F
Approximately 3 minutes after OBOGS is activated, the ______ annunciator will light if there is a system failure during the system self test.
OBOGS FAIL
