Environmental Control System

Question 1

What does the environmental control system (ECS) do?

Answer 1

Provides automatic temperature and pressurization control

Question 2

What is the air source for heating and pressurization?

Answer 2

Conditioned engine bleed air

Question 3

What type of system provides cockpit cooling?

Answer 3

Vapor cycle system which uses an engine-driven compressor

Question 4

Where are the environmental controls located?

Answer 4

A full set of environmental controls is located in the front cockpit, right side console

Question 5

What is engine bleed air used for on the T-6B?

Answer 5

Canopy Pressurization seal, anti-G system, cockpit heating and defogging, pressurization, and on-board oxygen generation system (OBOGS).

Question 6

Where is the bleed air tapped from on the engine?

Answer 6

The engine compressor section at the left and right P3 ports

Question 7

What does bleed air pass through before being distributed to the different systems?

Answer 7

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

Question 8

How is cooling air provided to the heat exchanger?

Answer 8

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.

Question 9

What is bleed air from the left side P3 port used for, and how is it controlled?

Answer 9

OBOGS. It is controlled with the supply lever on the oxygen regulator in each cockpit

Question 10

What is bleed air from the right side P3 port used for?

Answer 10

canopy seal, anti-G, heating/defogging, and pressurization.

Question 11

How would you prevent bleed air from the right P3 port from entering the cockpit?

Answer 11

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.

Question 12

What are the three settings for bleed air inflow?

Answer 12

OFF: both solenoids de-energized, valve closed NORM: one solenoid energized, valve partially open HI: second solenoid energized and airflow increases

Question 13

What does turning DEFOG on do to the inflow valve?

Answer 13

Fully opens the inflow valve

Question 14

When is the inflow valve automatically closed regardless of the BLEED AIR INFLOW switch position?

Answer 14

Below 7,500 ft MSL

Question 15

What bleed air duct temperature will trip the DUCT TEMP caution?

Answer 15

300 F

Question 16

How is the firewall bleed air shutoff valve closed?

Answer 16

By pulling the FIREWALL SHUTOFF handle. You will also shutoff fuel and hydraulics at the firewall.

Question 17

How is bleed air metered to the pilot’s anti-G suit?

Answer 17

Each anti-G valve has a weighted rod with an orifice which is displaced toward full open by gravity during positive G acceleration.

Question 18

What protects anti-G valves from contamination?

Answer 18

water seperator

Question 19

What protects the anti-G system from over-pressure?

Answer 19

A safety valve automatically provides pressure relief if the pressure exceeds 7 psig

Question 20

Does bleed air for the heating and defogging system flow through the heat exchanger?

Answer 20

The bleed air may continue through or bypass the heat exchanger