Brakes

Question 1

Looking at the triple indicator (TPI), what does the top indicator display?

Answer 1

Brake accumulator pressure in the YELLOW hydraulic system

Question 2

Which hydraulic system is used to apply the brakes when the parking brake is set?

Answer 2

The YELLOW hydraulic system

Question 3

If the parking brake is set and the TPI indicates the accumulator pressures low, how do you charge it?

Answer 3

Obtain ground clearance

Turn off PTU switch

Turn on YELLOW pump

When accumulator is charged, turn off YELLOW pump

Turn PTU back on

Question 4

When taxing out with both engines running, when you step on the brakes, what indication do you expect to see on the bottom pressure indication of the TPI?

Answer 4

The indicators should read zero. The TPI only shows YELLOW pressure applied to the brakes. With both engines running, the GREEN system should be should be pressurized and normal brakes should be working.

Question 5

Taxing out you step on the brakes and nothing happens, what do you do?

Answer 5

Immediately release the brake peddles

Turn off the A/SKID NW STRG switch

Reapply brakes 1000 psi max

If still no braking, use parking brake

If still no braking, use reverse thrust

Question 6

After performing immediate action items for brake failure, which brake system will you be using?

Answer 6

The alternate brake system YELLOW hydraulic

Question 7

If using the alternate brake system, will anti-skid still work?

Answer 7

It may or may not. If YELLOW is fully operational you still have anti-skid. If you only have accumulator pressure, you do not have anti-skid

Question 8

What parameters cause the BSCU to apply MED auto brakes on landing?

Answer 8

Two seconds after ground deployment if deceleration from thrust reversers are not adequate

Question 9

What does the DECEL light tell you if it is on?

Answer 9

Actual aircraft deceleration corresponds to 80% of the selected rate. Measured by ADRs

Question 10

If the DECEL light is on, does that mean the brakes are being applied?

Answer 10

NO

Question 11

What systems need to be working for auto brakes to work?

Answer 11

A/S NW STRG switch on

BSCU working

Normal GREEN system brakes

Anti-skid

At least one ADR

Question 12

MAX brakes selected, will you get auto brakes if you execute a low speed abort?

Answer 12

Not if the abort is made below 72 kts. Because automatic spoiler extension extension will not occur below that speed.

Question 13

After landing, what brake temperature requires a log book write up?

Answer 13

If temperature difference on brakes of the same gear are greater than 150 C

Temp on brakes grater than 600 C

Temps on brakes less than 60C