Final Exam Review Hyd

Question 1

From the “Heartbrake for 11 families” ppt, what ignited and started the fire when it came into contact with hot brakes?

Answer 1

The 5606 and 83282 fluid mixture leaked onto the hot brakes

Question 2

How do you determine the correct fluid for brake lines?

Answer 2

MIL spec

Question 3

Why were the brakes so hot?

Answer 3

Left brake seized partially during takeoff roll

Question 4

What are some of the symptoms of seized brakes in operation of aircraft

Answer 4

1. Increased power necessary to taxi. 2.Longer or MUCH longer takeoff rolls (possibly longer than available runway.) 3.Hot, burned or seized brake components. Possible fire in the main gear well.
2. Tire failure on takeoff or the next landing. 5.Overheated hydraulic fluid streaming overboard from the vent located near the nosewheel well.

Question 5

What is the flash point of a fluid?

Answer 5

The temp at which the fluid forms vapours enough for it to ignite into flames

Question 6

What was the propair mtce department doing with these two types of fluid?

Answer 6

Mixing the fluids

Question 7

What are the two types of hyd reservoirs?

Answer 7

Bleed air type and Bootstrap type

Question 8

When servicing a reservoir, how should aircraft be config?

Answer 8

All flight controls neutral

Question 9

What should you do before disconnecting and reconnecting a line with both types of reservoirs?

Answer 9

Bleed off header pressure

Question 10

How do you finish servicing an accumulator with nitrogen?

Answer 10

close the accumulator servicing valve and close the regulator valve
close the bottle valve
disconnect the air hose and bleed off any trapped pressure between the bottle and regulator (close the bottle valve, open the regulator valve to bleed, then close the regulator valve)