skyblue CBT Landing Gear and brakes

Question 1

what components make up each main gear?

Answer 1

2 wheels with tubeless tires and a hydro-pneumatic shock absorber

Question 2

which hydraulic system powers the landing gear?

Answer 2

green

Question 3

what is used to extedn the gear in the event of a hydraulic failure?

Answer 3

gravity gear extension

Question 4

what does the gear position detection and indiaction system provide information to?

Answer 4

the crew and the MFC

Question 5

what manages extension and retraction of landing gear?

Answer 5

MFC

Question 6

what brakes are on each main gear?

Answer 6

2 sets of multi disk carbon brakes equipped with anti skid

Question 7

what 3 things determine how much anti skid is delivered?

Answer 7

• wheel slip
• brake and tire wear
• runway conditions

Question 8

what does the anti skid system deliver

Answer 8

touchdown protection

wheel lock protection

anti skid

Question 9

when will the fusable plugs release tire pressure?

Answer 9

when temperature exceeds 177C

Question 10

what does the pressure relief valve on the wheel do?

Answer 10

protects against overpressuriatstion

Question 11

how are the multi disk carbon brakes operated?

Answer 11

hydraulically powered pistons

Question 12

what is each carbon brake equipped with?

Answer 12

automatic adjuster

overheat detector

wear indicator pin

Question 13

what is max deflection of the NWS?

Answer 13

60 degrees

Question 14

which hydraulic system powers the NWS?

Answer 14

blue

Question 15

when will we get a WHEELS BRK HOT on the EWD with a caution and chime?

Answer 15

when any brake temperature exceeds 150C

Question 16

what are downlock and air ground signals provided by?

Answer 16

proximity sensors

Question 17

what provides uplock signals?

Answer 17

mechanical limit switches

Question 18

what is the primary detection and indication system controlled by?

Answer 18

MFC 1A

Question 19

what is the primary detection and indication system powered by?

Answer 19

DC STBY BUS

Question 20

what is the secondary detection and indication system controlled by?

Answer 20

MFC 2

Question 21

what is the secondary detection and indication system powered by?

Answer 21

DC BUS 2

Question 22

what does the WOW systems supply information to?

Answer 22

• pressurisation
• anti-ice systems
• other systems

Question 23

what controls WOW system 1?

Answer 23

MFC 1B

Question 24

what controls MFC system 2?

Answer 24

MFC 2B

Question 25

what powers WOW system 1?

Answer 25

DC EMER BUS

Question 26

what powers WOW system 2?

Answer 26

DC BUS 2

Question 27

how is landing gear retracted?

Answer 27

MFC electrically controls a landing gear selectro valve in the main left gear fairing the valve supplies green hydraulic pressure to unlock each gear pressure is then delivered to the retraction side of the gear actuators extension side of the actuators is then used to return hydraulic pressure to the resevoir

Question 28

how are the nose gear doors driven?

Answer 28

mechanically

Question 29

what happens when the gear is up?

Answer 29

- locked by an uplock mechanism - hydraulic pressure removed from the retraction side of the actuator

Question 30

how is the landing gear extended?

Answer 30

the MFC will supply green hydraulic pressure to retract the uplock mechanism green hydraulic pressure is then provided to the extend side of the actuators retract side is used to return fluid to the resevoir

Question 31

what keeps the gear in the down position once extended?

Answer 31

dual alignment folding side brace and locking springs

Question 32

what is the drag brace moitored for?

Answer 32

downlock indications

Question 33

what happens to hydraulic pressure once gear is down and locked?

Answer 33

pressure removed from extension side of the actuator

Question 34

what assists emergency gear extension on the main gear?

Answer 34

gas actuator and springs

Question 35

what assists gear extension on the nose gear?

Answer 35

mechanical extension device

Question 36

what locks gear in place when extended?

Answer 36

the braces

Question 37

what powers the NWS?

Answer 37

blue hydraulic system

Question 38

what powers the NWS selection valve?

Answer 38

DC EMER BUS

Question 39

what can the NWS be deflected to in the abscense of blue hydraulic pressure?

Answer 39

91 degrees

Question 40

what does the swivel valve do?

Answer 40

removes hydraulic pressure from the NWS when gear is not down

Question 41

what does the solenoid valve do?

Answer 41

removes hydraulic pressure from the NWS when main gear shock absorbers are not compressed this will also mechanically centre the nose gear

Question 42

what is required for NWS?

Answer 42

all gear shock absorbers to be compressed

Question 43

what happens to the NWS if one shock absorber is released during taxi?

Answer 43

NWS will still be avialble as long as one wheel is still on the ground

Question 44

how is NWS controlled?

Answer 44

NWS switch on captains side. this arms the solenoid valve

Question 45

what are the 2 brake operating modes?

Answer 45

normal mode emergency and parking mode

Question 46

how do braking modes provide pressure to the brakes?

Answer 46

shuttle valves

Question 47

how much pressure is available for emergency braking?

Answer 47

500psi

Question 48

when is additional pressure (more than 500psi) available for the emergency brake?

Answer 48

when below 60 knots

Question 49

how much pressure is available to the park brake?

Answer 49

3000 psi

Question 50

when should the tire be inspected?

Answer 50

if the hndle was used above 20GS to check the condition of the fusable plug

Question 51

when is anti skid available?

Answer 51

gear down and locked at faster than 10 GS

Question 52

what makes up the anti skid system?

Answer 52

- anti skid panel - control box - antiskid module - 4x wheel speed transducers

Question 53

what does the anti skid do?

Answer 53

calculates optimum decel and modulates pressure to the brakes to achieve correct tire speed.

Question 54

what will anti skid system do if skidding is sensed?

Answer 54

reduce hydraulic pressure to the associated wheel

Question 55

when will the anti skid system sense a locked wheel and release brake pressure?

Answer 55

speed differential in excess of 50% detected between inne and outer pair of main wheels

Question 56

when is locked wheel protection available?

Answer 56

above 23GS

Question 57

what powers inboard anti skid?

Answer 57

DC ESS BUS

Question 58

what powers outboard anti skid?

Answer 58

DC EMER BUS

Question 59

when will the touchdown protection prevent the brakes from operating?

Answer 59

- for 5 seconds after touchdown - or as long as wheel speed is below 35 knots

Question 60

when will the red gear handle light illuminate?

Answer 60

1. flaps at 45 degrees 2. flaps 30 degrees below 500RA 3 one power lever FI below 500RA

Question 61

when will the red UNLK display?

Answer 61

gear not down and locked or uplock box not in open position on the ground

Question 62

up to what speed can we use the emergency brake?

Answer 62

V1

Question 63

does anti skid operate when using the emergency brake?

Answer 63

no

Question 64

where is the BRK TEMP test button?

Answer 64

F/O maintenance panel

Question 65

how is a failed anti skid channel identified?

Answer 65

amber F in the EWD message during test or failure

Question 66

when should the anti skid test not be carried out?

Answer 66

without parking brake set and engines running

Question 67

when is anti skid test mode inhibited?

Answer 67

above 17GS

Question 68

when will the park brake accumulator pressure display a failure?

Answer 68

when pressure below 1600psi