Hydraulics

Question 1

Which hyd malfunctions would require closing of the applicable HYD SOV?

Answer 1

HYD overtemp or HYD leak

Question 2

What is the RAT precharge accumulator pressure?

Answer 2

1000psi

Question 3

Which HYD system is powered by the RAT?

Answer 3

HYD system 3

Question 4

What type of HYD fluid is used in the GLEX?

Answer 4

SKYDROL

Question 5

What is the normal HYD operating pressure?

Answer 5

3000psi

Question 6

What are the AC power sources for the ACMPs?

Answer 6

1B - AC Bus 3 2B - AC Bus 2 3A - AC Bus 4 3B - AC Bus 1

Question 7

Which HYD systems are powered by the EDPs?

Answer 7

HYD systems 1 and 2

Question 8

How many HYD systems provide the aircraft with HYD power?

Answer 8

Three

Question 9

During a single generator operation, which ACMPs remain available?

Answer 9

ACMPs 3A and 3B

Question 10

Why does ACMP 1 or 2 remain operating for a minimum of 5 mins once activated due to system low pressure?

Answer 10

To prevent overheating of the ACMP due to on/off cycling

Question 11

When will an ACMP start with the HYD switches in AUTO?

Answer 11

Either slats/flaps not IN/Oº position or when system low pressure detected

Question 12

What is the purpose of the RAT accumulator?

Answer 12

Provides up to 44 secs of positive reservoir pressure to force fluid pressure into the RAT delivery line

Question 13

What is the precharge pressure of the brake accumulators?

Answer 13

500psi

Question 14

How many HYD pumps are required for normal system operation?

Answer 14

One HYD pump for each system

Question 15

How is HYD case drain fluid cooled prior to returning to the applicable reservoir?

Answer 15

Heat exchangers in the left and right wing fuel tanks: left wing - systems 1 and 3, right wing - system 2

Question 16

Why is there a 2-second delay between ACMP starts when multiple pumps are commanded on?

Answer 16

To prevent an AC electrical overload