Environmental Control System Flashcards
What does the environmental control system (ECS) do?
Provides automatic temperature and pressurization control
What is the air source for heating and pressurization?
Conditioned engine bleed air
What type of system provides cockpit cooling?
Vapor cycle system which uses an engine-driven compressor
Where are the environmental controls located?
A full set of environmental controls is located in the front cockpit, right side console
What is engine bleed air used for on the T-6B?
Canopy Pressurization seal, anti-G system, cockpit heating and defogging, pressurization, and on-board oxygen generation system (OBOGS).
Where is the bleed air tapped from on the engine?
The engine compressor section at the left and right P3 ports
What does bleed air pass through before being distributed to the different systems?
Bleed air passes through a heat exchanger assembly which has two sections: one for anti-G, canopy seal, and OBOGS, and one for all other ECS functions
How is cooling air provided to the heat exchanger?
A blower supplies cooling air while on the ground, and ram air provides cooling air with weight off the landing gear. Uses flappers to divert the air.
What is bleed air from the left side P3 port used for, and how is it controlled?
OBOGS. It is controlled with the supply lever on the oxygen regulator in each cockpit
What is bleed air from the right side P3 port used for?
canopy seal, anti-G, heating/defogging, and pressurization.
How would you prevent bleed air from the right P3 port from entering the cockpit?
Both the BLEED AIR INFLOW switch on the environmental control panel and the DEFOG switch on the center console must be in the OFF position. Located in front cockpit only.
What are the three settings for bleed air inflow?
OFF: both solenoids de-energized, valve closed NORM: one solenoid energized, valve partially open HI: second solenoid energized and airflow increases
What does turning DEFOG on do to the inflow valve?
Fully opens the inflow valve
When is the inflow valve automatically closed regardless of the BLEED AIR INFLOW switch position?
Below 7,500 ft MSL
What bleed air duct temperature will trip the DUCT TEMP caution?
300 F
How is the firewall bleed air shutoff valve closed?
By pulling the FIREWALL SHUTOFF handle. You will also shutoff fuel and hydraulics at the firewall.
How is bleed air metered to the pilot’s anti-G suit?
Each anti-G valve has a weighted rod with an orifice which is displaced toward full open by gravity during positive G acceleration.
What protects anti-G valves from contamination?
water seperator
What protects the anti-G system from over-pressure?
A safety valve automatically provides pressure relief if the pressure exceeds 7 psig
Does bleed air for the heating and defogging system flow through the heat exchanger?
The bleed air may continue through or bypass the heat exchanger
