B757 Review Questions. Hydraulics and Landing Gear If the normal, alternate, and reserve braking...

B757 Review Questions

Hydraulics and Landing Gear

• If the normal, alternate, and reserve braking systems were not available, and the brake pressure gauge indicated 1,000psi, how many brake applications are available?

• None, the gauge only shows pre-charge.


• Pulling the associated engine fire handle has what consequences on the hydraulic

system?

• Shuts off the engine driven hydraulic pump


• Is the PTU ever inhibited from operating?

• Yes, when the right engine is not operating.


• What braking provides max deceleration?

• RTO


• How do you know the RAT has been deployed?

• Green RAT PRESS light and system pressure light is out


• What does the Brake Source light indicate?

• This indicates that normal and alternate brake system pressure is low.


• Is anti-skid available during alternate brake system use?

• Yes. However anti skid is limited to truck pairs, not individual wheels.


• TRUE / FALSE: alternate landing gear extension uses residual fluid from the left

system and a small electric pump to unlock the up locks.

• True.


• Is anti-skid brakes available for Normal, Alternate, and reserve brakes?

• Yes.


• What would cause the PTU to activate?

• Left engine fails, or the left engine pump pressure is low.


• When does the BRAKE SOURCE light come on?

• Failure of normal and alternate brakes


• How can I check the operation of the PTU?

• Status page indicates normal pressure in the left hydraulic system and the absence of

power transfer unit message.


• What is the standpipe fluid reserved for in the center hydraulic system?

• Operation of Ram Air Turbine


• What is the standpipe fluid reserved for in the right hydraulic system?

• Operation of reserve brakes


• Name the different kinds of brakes on the B757?

• Normal, alternate, reserve, and accumulator


• How is the gear and doors held in the up position?

• Mechanical locks


• Do you need electrical power to lower the landing gear with the alternate system?

• Yes, the small electrical hydraulic pump needs power.


• After using the alternate gear system, does the gear door light remain on?

• Yes it is a disagreement because the gear doors remain open.


• What is the maximum steering angle possible using the rudder pedals?

• 7 degrees


• What is the maximum steering angle possible using the tiller?

• 65 degrees


• When will the BRAKE TEMP light on the forward instrument panel illuminate?

• Any brake temp value above 5


• What is the significance of the standpipe in the left hydraulic system?

• To protect sub-systems of the PTU.


• What are the primary systems of the PTU?

• Flaps/slats, landing gear, steering and HDG if needed


• What are the primary systems of the center hydraulic system?

• Flight controls


• What hydraulic system operates the stabilizer trim?

• Center and right


• What is the minimum airspeed for the RAT to provide hydraulic pressure?

• 130 knots


• What is the significance of the standpipe in the right hydraulic system?

• To protect the normal brake system for reserve brake operation.


• What happens when you select reserve brakes, and how do you know have reserve brakes?

• The right electric hydraulic pump activates regardless of switch position, and the pump is isolated from the other right system components so that the pump pressure is

supplied exclusively to the normal brake system. You will not have a brake source light


• How do you select alternate brakes, and how do you know you have alternate

brakes?

• Alternate brakes are selected automatically with loss of the right system pressure.


• When does the RTO function work during takeoff?

• Above 85 kts.


• When would the RSVR light illuminate?

• Low reservoir quantity or pressure.


• When does the auto brake system immediately disarm without pilot action?

• When an auto brake or normal anti-skid system fault occurs


• If the fluid level in the right reservoir has leaked down to the top of the standpipe

fluid remains available for operation of the

• Reserve Brakes


• Which hydraulic reservoir provides the fluid to the PTU for operation of the flaps,

slats, landing gear, nose wheel steering, and PTU when the Right hydraulic system is providing the drive energy for the PTU.

• Left.


• Elevator feel Stabilizer Trim are powered from which two hydraulic systems?

• Right and Center


• Which center hydraulic pump is normally inhibited when only one electrical source of

power is available?

• #2


• The Yaw Dampers are powered from which two hydraulic systems

• Left and Center


• Which hydraulic system provides fluid for the alternate brakes?

• Left


• The reserve brake switch activates the _______, which draws fluid from the below

standpipe level of the right reservoir and uses it to pressurize the normal brake

system.

• Right hydraulic system electric pump


• The _______ furnishes the hydraulic power for landing gear retraction and extension

including the nose gear steering.

• Left hydraulic system


• For landing, the Auto brake system is activated when _____and the _______.

• Both thrust levers are at idle, the wheels have spun up


• There are several ways to disarm the auto brake system on landing. Among them are:

• Advancing thrust levers, moving speed brake lever down, applying manual braking


• TRUE/FALSE: If both normal and alternate brake systems do not work, the reserve

brake system automatically takes over the system

• FALSE

B757 Review Questions. Hydraulics and Landing Gear If the normal, alternate, and reserve braking...

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