Hydraulics

Question 1

Which systems are on the left Hydraulic system?

Answer 1

TIE:

T- Thrust Reverser (Left)
I- Inboard Flight Spoilers
E- Elevator Augmentation

Question 2

Which systems are on the right Hydraulic system?

Answer 2

GATOR:

G- Gear
A- Aft Stairway
T- Thrust Reverser (Right)
O- Outboard Flight Spoilers
R- Rudder

Question 3

3 major elements of the Hydraulic system?

Answer 3

1. ) Left Hyd System
2. ) Right Hyd System
3. ) Transfer Pump

Question 3

Which systems are on both Hydraulic systems?

Answer 3

FANGS:

F- Flaps
A- Anti skid brakes
N- Nose wheel steering
G- Ground spoilers
S- Slats

Question 5

How does pulling the Fire Handle affect hydraulic operations?

Answer 5

It shuts off flow to the engine driven hydraulic pump by closing the Fire Shut Off valve

Question 6

What pressure do the EDPs put out in HI and LOW?

Answer 6

HIGH= 2800-3100 psi

LOW= 1300-1700 psi

Question 7

Where is the Aux Hydraulic Pump located and how is it powered?

Answer 7

In the right wheel well and is powered by the left Gen Bus

Question 8

When will you see a L/R HYD PRESS LOW annunciator light?

Answer 8

When the system pressure drops below 1000 psi

Question 9

At what pressure will the pressure relief valves activate?

Answer 9

Above 3600 psi

Question 10

What order do we turn ON/OFF the hydraulic pumps?

Answer 10

ATM:

Aux Pump
Transfer Pump
Motor Pumps

Question 11

What happens when you pull the fire handle?

Answer 11

• silences the fire bell
• arms fire bottle squibs
• GCR Tripped (opens)
• Pneumatic X-feed valve closed
• Hyd shutoff valve closes
• Fuel Shut off valve closes

Question 12

How many accumulators are there on the hydraulic system, where are they?

Answer 12

6 total-BEARR

Brakes- 3-5 cycles (2 accumulators)

Elevator Augmentation- 2 pushes (1)

Aft Stairs- mostly for lowering (1)

Rudder- buffers landing gear transients

Reverse Thrust (2)

Question 13

What indications will you get with the Spoiler Shutoff valve in OFF/ON/SYSTEM BYPASS?

Answer 13

ON (normal)= “L/R HYD PRESS LOW” not illuminated
Good pressure indication

OFF (depowers OFS)= “L/R HYD PRESS LOW” illuminated
Good pressure indication

SYSTEM BYPASS (Depowers System)= "L/R HYD PRESS LOW" illuminated
No pressure indication

Question 14

How is the nose steering affected when operating on one hydraulic system?

Answer 14

Steering to the opposite direction of the inop system will be reduced, max 55*
Ex. Right hydraulic system inop= reduced steering to the left

Question 15

In a complete AC loss situation what happens to the hydraulic pumps?

Answer 15

EDPs= Fail to the ON/HI

PTU= Failed to last position

Aux Pump= Failed to OFF position

Question 16

What would a L/R HYD TEMP annunciator mean?

Answer 16

High fluid temp in the hydraulic reservoir

Question 17

What protections does the Aux Hyd pump have?

Answer 17

It will automatically shutdown if it overheats

Can be overridden in the OVRD position (emergency situation for short term use Ex. putting the gear down)

Question 18

What powers the motor for the Transfer Pump valve?

Answer 18

Right DC Bus

Question 19

When will the amber HYD QTY light illuminate?

Answer 19

Engines running- Below 4 qts

Engines shutdown= Below 8 qts on the right engine
Below 7 qts on the left engine

Question 20

How are the hydraulic pumps powered?

Answer 20

EDPs= Respective DC Bus

Transfer Pump= Right DC Bus

Aux Pump= Left Generator Bus