Hydraulics

Question 1

What is on the Left Hydraulic System?

Answer 1

Rudder Ratio

Flight Controls

Question 2

What is on the Right Hydraulic System?

Answer 2

Pitch Enhancement System
Flight Controls
Normal Brakes

Question 3

What is on the Center Hydraulic System?

Answer 3

Flight Controls
Flaps & Slats
Tail Skid
HDG
Alternate Brakes
Nosewheel Steering
Gear

Question 4

Tell me about the engine driven pump on the left hydraulic system.

Answer 4

The engine-driven pump is the primary pump of the left hydraulic system.
The pump controls are the engine pump switch and the respective engine fire switch on the fire control panel.

Question 5

What are the Primary Pumps?

Answer 5

Left Engine, No 1 & 2 Center Electric, Right Engine

Question 6

What are the Secondary Pumps?

Answer 6

Left Electric Demand, Air Demand, Right Electric Demand Pumps

Question 7

When is the Engine Driven Pump in the left depressurized?

Answer 7

The pump is depressurized when the pump switch is off or when the fire switch is pulled.

Question 8

Hydraulic OVHT light means what?

Answer 8

if the engine-driven pump casing temperature is too high

Question 9

What does the ON switch do on the L ENG Primary?

Answer 9

The ON position activates the electric pump for continuous operation.
ON is not selected for normal operations.

Question 10

What does the AUTO Selector do when engine starting?

Answer 10

For the left system, the demand condition occurs when the left engine driven pump output pressure is low.
The AUTO position is normally selected before engine start. This action makes the demand pump available throughout the flight.

Question 11

What are the Four Pumps on the Center Hydraulic System?

Answer 11

2 Electric Driven Pumps - Pressurize the Center System
1 Air Driven Pump-
1 RAT

Question 12

Tell me about the Air Dewmand Pump. (ADP)

Answer 12

Driven by bleed air and operates on demand only.
Failure of both electrical systems, ADP will provide pressure to the Center System. Must be in AUTO.

The Air Driven Pump provides an additional source of pressure to the Center system.
It is a high capacity pump that is driven by bleed air pressure from the center manifold of the pneumatic system.

Works when heavy loads are selected
Works when both center engine pumps have low pressure.

ADP has enough power to operate the HDG and the 11 essential components.

Question 13

RAT

Answer 13

Can Pressurize Center System to get Flight Controls only when dual engine failure.
Can be manually deployed by pressing switch.

UNLKD: It has been deployed
PRESS: Adequate pressure is being created to power flight controls
-Must be above 130 kts for adequate pressure

Arms at 80 knots on takeoff
Has A/G logic to prevent deployment on Ground of Main Gear Tilt

Question 14

What does QTY light mean

Answer 14

It has a QTY light to indicate low fluid level.

Question 15

Tell me about the Center 2 Primary Electric Hydraulic pumps

Answer 15

The two electric hydraulic pumps provide the primary power for the center hydraulic system.
Two switches labeled ELEC 1 and ELEC 2 are used to control the pumps.
When the aircraft is parked, these pump switches are normally OFF.
Both of these switches are normally switched ON before engine start.

Question 16

Why do I have just one Center Primary Electric Hydraulic light on

Answer 16

When only one electrical power source is available and both Center motor pumps are selected ON, the number 2 pump is inhibited to reduce the electrical load.
Therefore, with both pump switches selected to ON, the number 2 pump will show a PRESS light until a second electrical power source is made available.

Question 17

What happens with the standpipe?

Answer 17

C1 pump receives fluid from below the standpipe level of the center reservoir. Alternate brakes are in the center system. If quantity is sensed low in the center system reservoir, an isolation valve automatically closes to direct the C1 pump to only pressurize the Alternate Brake components and Nosewheel steering.
This automatic isolation provides RESERVE brake operation through the alternate brakes on the 767.

Question 18

When ADP is used to power HDG-what happens with the flaps?

Answer 18

The speed of retraction and extension is reduced.

Question 19

When do you get a green PRESS light in the RAT switch?

Answer 19

When the RAT delivers adequate hydraulic pressure.

Question 20

When is automatic RAT deployment inhibited?

Answer 20

automatic RAT deployment is inhibited below 80 kts., at taxi speeds and below, in order to keep the RAT from deploying after engine shutdown at the gate.

Question 21

Hydraulic Quantity Display;

At or below ____ a QTY indication is presented

Answer 21

.50

Question 22

Hydraulic Quantity Display;

A QTY above ____ is required for dispatch?

Answer 22

RF

RF Is Approx 75%

Question 23

Hydraulic Quantity Display;

1.22 or more show _____ for _____and requires MX action.

Answer 23

OF- overfill

Question 24

Overheat message for the Center system primary pumps is_______

Answer 24

C HYD 1 OVHT and C HYD 2 OVHT for the #1 and #2 primary electric pumps respectively.

Question 25

Low Pressure of Center System Primary Pumps

Answer 25

C HYD PRIM 1 and C HYD PRIM 2 for the number 1 and 2 pumps respectively.

Question 26

The EICAS message for low pressure of the Center ADP

Answer 26

C HYD DEM PUMP

Question 27

When does the RAT Activate?

Answer 27

Loss of Both Engines

Question 28

Which pump on the Center system can provide pressure for Reserve Brakes and Steering?

Answer 28

C1 -Remember the standpipe