Hydraulics

Question 1

HOW MANY HYD SYS WE HAVE ON THE B777?

Answer 1

3 THE L,C,R

Question 2

WHICH SYSTEMS ARE POWERED BY THE HYD?

Answer 2

FLT CONTROLS,
BRAKES,
ALTN BRAKES
LANDING GEAR ACTUATION
NOSE AND MAIN WHEEL STEERING
LE SLATS
TE FLAPS
THRUST REVERSER

Question 3

HOW MANY HYD SYS ARE REQUIRED TO MAINTAIN AN ADEQUATE AIRPLANE CONTROLLABILITY?

Answer 3

1 SYSTEM CAN PROVIDE AN ADEQUATE AIRPLANE CONTROLLABILITY

Question 4

WHICH SYSTEMS ARE HYDRAULICALLY POWERED BY THE L SYS?

Answer 4

FLIGHT CONTROL AND LEFT ENGINE TRUST REVERSER

Question 5

WHICH SYSTEMS ARE POWERED BY THE R HYD?

Answer 5

FLT CONTROLS, R REVERSER AND NORMAL BRAKES

Question 6

WHICH SYS IF FAILS LEAD TO NO AUTOLAND?

Answer 6

L HYD

Question 7

HOW MANY PUMPS HAVE THE L AND R HYD?

Answer 7

TWO EACH , ONE PRIMARY AND ONE ON DEMAND

Question 8

WHAT IS THE PURPOSE OF DEMAND HYDRAULIC PUMPS?

Answer 8

THE DEMAND HYD PUMPS ARE ELEC MOTOR DRIVEN PUMPS, ABLE TO PROVIDE A BACKUP HYD POWER SOURCE FOR THE PRIMARY ENGINE DRIVEN PUMPS,

AND PROVIDE AS WELL A SUPPLEMENTARY HYD POWER IN PERIOD OF HIGH DEMAND

Question 9

WHICH DEMAND PUMP RUN CONTINUOSLY ON GRD WITH THE SWITCH IN AUTO?

Answer 9

THE RIGHT DEMAND PUMP

Question 10

WHEN THEY OPERATE THE DEMAND PUMPS?

Answer 10

DURING TAKE OFF AND LANDING, AND WHEN THE SYS OR PRIMARY PUMP PRESSURE IS LOW

Question 11

WHICH SYS POWER THE CENTER HYD?

Answer 11

FLT CONTROLS,
ALTN BRAKES
LE SLATS
TE FLAPS
NOSE WHEEL AND MAIN WHEEL STEERING
LANDING GEAR ACTUATION

Question 12

TO WHICH SYS THE RAT CAN PROVIDE HYD POWER?

Answer 12

TO THE CENTER HYD FOR THE PURPOSE OF POWERING THE PRIMARY FLT CONTROLS COMPONENTS ONLY

Question 13

HOW MANY PUMPS HAS THE CENTER HYD?

Answer 13

2 PRIMARY AND 2 DEMAND

Question 14

IF ON GRD AND ONLY ONCE SOURCE AVAILABLE INCLUDING THE APU, WHICH PUMPS WILL WORK?

Answer 14

C2 PUMP WILL NOT RUN IF C1 IS SELECTED, UNLESS: ONE ENGINE IS RUNNING,or PRIMARY AND SECONDARY EXT PWR ARE OPERATING,or APU + PRIMARY EXT PWR ARE OPERATING

Question 15

IN FLT WHEN THE C2 PUMP MAY BE LOADSHED?

Answer 15

ALL OTHER ELECTRIC PUMPS ARE WORKING,
SINGLE SOURCE OF ELECTRIC PWR,
GEN CAPACITY IS EXCEEDED

Question 16

IF “ON” IS SELECTED THE DEMAND C1 AND C2 CAN OPERATE TOGETHER?

Answer 16

NO THEY CANNOT

Question 17

IF ON GRD AND SPEED ABOVE 60 KTS AND THE CENTER HYD QTY IS LOW WHAT WILL HAPPEN?

Answer 17

ALTN BRAKES ARE ISOLATED FROM THE SYS AND CONTINUE TO OPERATE USING RESERVE FLUID
NOSE GEAR STEERING ISOLATE AND IS UNUSABLE
SLAT ISOLATED AND NOT OPERABLE IN PRIMARY MODE HYD

Question 18

WHEN THE LE SLATS ARE CONNECTED BACK TO PRIMARY MODE FOLLOWING A CENTER HYD LOW QTY?

Answer 18

FLUID RECOVER NORMAL FOR 5 SECONDS AND SYS DETECT THAT ENGINES HAVE BEEN RUNNING FOR MORE THAN 30 SECONDS

Question 19

WHEN THE NOSE GEAR STEERING IS RECONNECTED FOLLOWING A DISCONNECTION DUE TO LOW HYD QTY?

Answer 19

SPEED DECREASE BELOW 60 KTS
HYD PRESSURE C IS LOW
LDG GEAR DOWN SELECTED , BOTH ENGINES ARE NORMAL AND ENGINE DRIVEN PUMP ARE PROVIDING PRESSURE

Question 20

WHEN RAT WILL DEPLOY?

Answer 20

BOTH ENGINE HAVE FAILED
BOTH AC TRANSFER BUS UNPOWERED
ALL 3 HYD SYS PRESS IS LOW