ECS (CSG)

Question 1

ECS

During normal flight operations, the bleed air source for ECS is _______.

Answer 1

P2.5

AOH Vol 2, Section 12

Question 2

ECS

What will happen if the 40 psi over pressure switch senses a higher pressure?

Answer 2

ECS Primary Shutoff Valve will close or remain closed

AOH Vol 2, Section 12

Question 3

ECS

What happens when you pull the ECS Firewall Shutoff Valve handle in the cockpit?

Answer 3

ECS firewall emergency shutoff valve closes, air scoop opens; (ECS primary shutoff valve closes as well)

AOH Vol 2, Section 12

Question 4

ECS

On a cold winter night, how would you activate warm airflow near your feet?

Answer 4

Push down on the foot lever located on sidewall to open the foot outlet

AOH Vol 2, Section 12

Question 5

ECS

When would you use MANUAL mode and what is the associated CAUTION?

Answer 5

Only when auto rheostat fails; be careful not to set system beyond cold or hot limits

AOH Vol 2, Section 12

Question 6

ECS

What is the power source for the underfloor heater and how do you turn it on?

Answer 6

Gen 2; automatically turned on with ECS switch in AUTO or
MANUAL

AOH Vol 2, Section 12

Question 7

ECS

What is the power source for the cabin heater and how do you turn it on?

Answer 7

Gen 1; CABIN HEATER switch on overhead panel

AOH Vol 2, Section 12

Question 8

ECS

(T/F) Both the cabin heater and the underfloor heater can be operated by selecting
the CABIN switch to ON when the aircraft is connected to 28 VDC external power.

Answer 8

True

AOH Vol 2, Section 12

Question 9

ECS

Will the cabin heater work if VCCS is operating?

Answer 9

No

AOH Vol 2, Section 12

Question 10

ECS

With the VCCS compressor operating, GEN 1 Amps may increase by as much as
_____ Amps

Answer 10

100

AOH Vol 2, Section 12

Question 11

ECS

(T/F) The VCCS is automatically shed with failure or shedding of the Non-Essential
bus.

Answer 11

True

AOH Vol 1, Chapter 3

Question 12

ECS

(T/F) When the VCCS compressor is operating, it gets priority over the hydraulic
pump via the hydraulic interlock relay.

Answer 12

False

AOH Vol 2, Section 12

Question 13

ECS

What are some possible causes of ECS failure?

Answer 13

Over temp, Over pressure, Firewall shutoff valve closed, ECS switch turned OFF, Engine Starter operating

AOH Vol 2, Section 12

Question 14

ECS

After an ECS failure, if the system will not reset, place ECS switch to ______ and
pull the ___________.

Answer 14

OFF, ECS Firewall Shutoff Handle

AOH Vol 1, Chapter 3

Question 15

ECS

How do you adjust ECS temperature using the manual mode?

Answer 15

Use rocker switch in increments toward COLD or HOT

AOH Vol 2, Section 12

Question 16

ECS

To properly set the cabin pressurization system during the BEFORE TAXI checklist,
set the cabin altitude selector to _____ ft above the planned aircraft cruise altitude.

Answer 16

500

AOH Vol 1, Normal Procedures

Question 17

ECS

What is the maximum pressure differential during normal operations?

Answer 17

5.75 psi

AOH Vol 2, Section 12

Question 18

ECS

When the aircraft is on the ground with weight on wheels switches closed, is it
possible to pressurize the aircraft?

Answer 18

Yes, by moving condition lever to FLIGHT IDLE

AOH Vol 2, Section 12

Question 19

ECS

The cabin rate control knob can be used to set rate of climb in the range ______ to
______ FPM.

Answer 19

100, 2000

AOH Vol 2, Section 12

Question 20

ECS

What happens when the CABIN PRESS DUMP switch is placed to DUMP?

Answer 20

Safety valve opens and aircraft depressurizes

AOH Vol 2, Section 12

Question 21

ECS

If you forget to set the cabin altitude selector correctly and leave it at sea level, what
will happen if you climb to FL250?

Answer 21

Aircraft will exceed max normal differential pressure limit and the safety and outflow valves will open at approximately 6.35 psi to keep differential pressure below 6.5 psi.

AOH Vol 2, Section 12

Question 22

ECS

When will the CAWS CAB PRESS Warning light illuminate?

Answer 22

If cabin altitude exceeds 10, 500 ft (+/-200 ft) or differential pressure exceeds 6.35 psi

AOH Vol 2, Section 12

Question 23

ECS

What is the first step in the CABIN FIRE/SMOKE or FUMES EVACUATION checklist?

Answer 23

Pilot Oxygen Masks….ON/100%

AOH Vol 2, Section 12