E190 - Landing gear

Question 1

What is the function of the LG override switch ?

Answer 1

It’s a backup for the normal landing gear lever. It also electronically bypasses the PSEM, and extends the landing gear in the same way as the landing gear lever.

Question 2

The LG WRN inhibit button can be used, for example, in case of failure of…. ?

Answer 2

The radio altimeters.

Question 3

After how many seconds after the discrepancy is a red gear disagree indication shown ?

Answer 3

After 20 seconds.

Question 4

If the emergency/PB accumulator pressure indication is shown in amber, it means:

Answer 4

the emergency/PB effectiveness is degraded.

Question 5

Are you allowed to take off with the brake temperature indication in amber ?

Answer 5

No.

Question 6

A red towing light means:(A green light means the opposite)

Answer 6

• external steering disengage switch is in the engaged position, or- parking brake applied, or- main brakes applied.

Question 7

Two … process signals from 6 … proximity sensors to determine if the airplane is on ground or in flight.

Answer 7

PSEM (proximity sensor electronic modules)WOW (weight on wheels).

Question 8

Is it possible to retract a gear if the respective two WOW-sensors of that gear have failed ?

Answer 8

No. This is indicated by the CAS msg:- LG NO DISPATCH (gnd)- LG WOW SYS FAIL (flight)

Question 9

How is the UP/DOWN status of each gear detected ?

Answer 9

By two uplock and two downlock sensors for every gear.

Question 10

What happens if you extend the gear ?

Answer 10

• Hydraulics up-locks are released- Gear is extended- Downlock springs lock the LG.

Question 11

By pulling the alternate gear lever:

Answer 11

• Hydraulic pressure is released.- Uplocks are released.- The landing gear free falls.

Question 12

What is the indication if the gear is selected down, but one of the 2 downlock sensors is in disagreement ?

Answer 12

Gear down. In case of disagreement, the sensor in agreement with the LG lever will be considered valid.

Question 13

What is the indication if the gear is selected up, but one of the 2 uplock sensors is in disagreement ?

Answer 13

Gear up. In case of disagreement, the sensor in agreement with the LG lever will be considered valid.

Question 14

What is the function of the DN LOCK REL button ?

Answer 14

It bypasses the LG down-protection logic for ground-mode.

Question 15

The L/G aural warning “LANDING GEAR” sounds in-flight when the gear is not down and:

Answer 15

S/F lever 0-4:- RA < 700 ft AGL- TLA < 38° (2#) or 57° (1#)S/F lever 5-FULL:- Always

Question 16

Which hydraulic systems power which brakes ?

Answer 16

Hyd system 1 - outboard brakesHyd system 2 - inboard brakes

Question 17

Normal braking is accomplished through which modules ? They are powered by ?

Answer 17

BCM 1 - DC ESS BUS 1BCM 2 - DC ESS BUS 2ABM - DC BUS 2

Question 18

The BCM main functions are protection for:

Answer 18

• locked wheel + antiskid protection- automatic wheel braking- touchdown protection.

Question 19

Locked wheel protection is only available when wheel speed is > … kts. If a wheelspeed is … lower, braking is stopped on this wheel to equalize wheel speeds again.

Answer 19

30 kts33%.

Question 20

Is anti-skid protection available for the emergency/parking brake system ?

Answer 20

No.

Question 21

Touchdown protection (disabling brakes) is de-activated when:

Answer 21

• wheelspeed > 50 kts, or- 3 sec on the ground (WOW)

Question 22

The emergency/parking brake has pressure accumulators, powered by hydraulic systems… . Sufficient pressure should be available for … brake applications.

Answer 22

Systems 1 and 2.6 brake applications.

Question 23

True or false ? As speed decreases, the required deflection of the emergency brake system decreases.

Answer 23

No, it increases to maintain continuous braking.

Question 24

Can the AB system be armed if the normal brake system is not operational ?

Answer 24

No.

Question 25

Wheel speed should be < … to arm the AB (for RTO or landing).

Answer 25

60 kts.

Question 26

RTO AB will be applied if wheel speed is > … kts and if idle or REV is selected.

Answer 26

60 kts.

Question 27

AB for landing: braking will not be applied until the airplane is on ground for > … sec.

Answer 27

2 sec.

Question 28

If thrust lever is more than idle, the AB system (during landing or RTO) will be:

Answer 28

Disarmed.

Question 29

If an AB fault is detected during RTO above 60 kts, will the AB system be disarmed ?

Answer 29

No.

Question 30

True or false ? On the ground (except for RTO) you can get an aural “AUTOBRAKE” alert if AB are disarmed.

Answer 30

True.

Question 31

To engage the NWS system:

Answer 31

• Hyd system 2 pressurised- External disengage switch to engaged- Handweel steering must be pressed

Question 32

Max speeds for handwheel steering:

Answer 32

< 10 kts:76°10 - 26 kts: 20°26 - 100 kts:7°

Question 33

What is the max steering angle using rudder pedals ?

Answer 33

7°.

Question 34

Is it possible to have handwheel and rudder steering enabled at the same time ?

Answer 34

No.

Question 35

Free wheel steering mode is automatically enabled when:

Answer 35

• Failure of the air/ground system occurs- NWS system failure detected- nosewheel angle is > 76%

Question 36

If you press the LG WRN INHIB button, the landing gear warning is inhibited and the white striped bar will illuminate. It will extinguish:

Answer 36

When the landing gear warning is not triggered.

Question 37

Is free wheel steering automatically enabled in case of a air/ground system failure ?

Answer 37

Yes.

Question 38

What is the minimum runway width for a 180° turn ?What requires the most clearance and how much meters ?

Answer 38

22 mThe tail: 21 m