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33 Cards in this Set
- Front
- Back
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What are the two types of Hydraulic pumps on the 757?
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Electric and Engine driven
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On the 757 hydraulic pump switch what are the lights in the switch?
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upper is the ON
lower is the PRESS |
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On the 757 what is the light below the hyd pump switch?
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OVHT
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The HYD systems are powered by which pumps on the 757?
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L system: L eng pump and L electric pump
C system: 2 center electric pumps R system: R eng pump and R electric pump |
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On the 757 what is the PTU?
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A hyd motor pump that operates from pressure from the R hyd sys and pumps fluid from a standpipe reservoir in the L hyd sys to operate the critical components in the L hyd system.
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The PTU will activate for what reasons on the 757?
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low left hyd sys pressure or
left eng failure |
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The PTU will provide pressure to operate what components on the 757?
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flaps
slats landing gear main cargo door steering |
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On the 757 during PTU operation what happens to the left hyd sys pressure light?
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It might remain on or go out.
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When is the PTU inhibited on the 757?
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When the right engine is INOP.
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On the 757 the RAT pressurizes which system?
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Center hyd sys
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On the 757 when does the RAT deploy?
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at the loss of both engines
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On the 757 below what airspeed does the RAT become ineffective?
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130 knots
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On the 757 if the RAT is deployed what do the hyd panel lights do?
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They go out.
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On the 757 RAT, how is fluid provided for it's operation?
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Fluid below a standpipe in the center reservoir is used for the RAT
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HYD Reservoir lights on the hyd panel display what and when?
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RSVR light indicates low quantity or air in sys
SYS PRESS light indicates low pressure |
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Reservoir Quantity is found where and what cautions can you find there?
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Status page gives % full
RF means low level OF means over filled |
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The L and R HYD pumps operate when?
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They are full time.
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Components serviced by the L HYD sys on the 757 are?
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L TR
ALT brakes L Autopilot Spoilers R Aileron Rudder Ration Yaw dampers Flaps & Slats Landing Gear N Wheel Steering Main Cargo Door which also has a hand pump |
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On the 757 the Components lost if fluid goes below the standpipe lever on hyd sys 1are:
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L TR
ALT brakes L A/P servos Spoilers Rudder ratio |
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On the757 Center hyd sys powers these components:
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Center A/P servos
Spoilers R L ailerons Elevators Rudder R yaw damper Elevator feel Stab trim |
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On the 757 the center sys has 2 elec pumps which operate full time except?
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Center pump 2 is inhibited if
Only one generator Only ext power is available |
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On the 757 the RAT does what?
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Provides backup pressure for the center sys.
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On the 757 what provides backup fluid for the RAT?
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A stand pipe in the center hyd sys.
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On the 757 if the center sys is lost you lose these components:
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Center A/P servos
Some spoilers R yaw damper |
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On the 757 the right hyd sys services the following components:
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R T/R
Normal brakes R A/P servos Spoilers L ailerons Elevators Rudder Elevator feel Stab trim PTU |
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On the 757 Fluid below the standpipe disables the following systems:
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Normal brakes
R T/R Some spoilers R A/P servos PTU |
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On the 757 the right standpipe does what?
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Right standpipe reserves fluid for
Reserve brakes |
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On the 757 pushing the Reserve Break Switch accomplishes the following:
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Opens valve to reservoir below standpipe
Closes valve to other components Activates electric pump to pressurize the brakes |
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On the 757 The Park brake light guarantees adequate brake pressure: TRUE or FALSE
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FALSE
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ON the 757 The Park Brake Light indicates what two items?
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The Park Brake Light indicates
the brake is set and the valve is closed. |
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Starting which pump will pressurize the brakes.
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The RIGHT HYD pump
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When only one generator is operating
which one of the center hydraulic pumps is inhibited? |
Center Electric pump 2
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When turning the HYD pumps on why do we start the Center HYD pump 2 first?
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To ensure it works because the #1 pump
will inhibit it when you turn it on. |
