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FT-339C > Landing Gear > Flashcards

Landing Gear Flashcards

1
Q

How many seconds for extension and retraction of landing gear?

A

5 sec

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2
Q

Legs of landing gear are kept in close position by

A

Hydraulic (pressure in the actuator)
Mechanical (locked doors where gear is housed)

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3
Q

Landing gear is kept in open position by

A

Hydraulic
Mechanical detent incorporated in the actuating cylinder

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4
Q

When the red landing gear lever light illuminates?

A

Position of the gear is not consistent with position of the lever
RPM<62% below 10.000ft at speed of 165KIAS or below
Landing gear is moving
Emergency extension

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5
Q

Power for landing gear lights and audio warning signal is supplied by

A

Essential bus

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6
Q

In which cases we are not able to lower the gear with main system?

A

Hydraulic failure
Electrical failure

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7
Q

What happens when I pull emergency gear extension handle?

A

Pressure in the line of speedbrake drops, then it is retracted by aerodynamic effect

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8
Q

When extending the gear with emergency system

A

Gear doors stay open
Red handle light remains illuminated

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9
Q

How long does it take emergency landing gear extension?

A

20 sec

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10
Q

Where does pressure for emergency gear extension come from?

A

Emergency hydraulic accumulator

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11
Q

In case of hydraulic pump failure, with still enough pressure in the main system, what allows braking action?

A

Pressure stored in the main accumulator

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12
Q

Emergency hydraulic system provides pressure for

A

Emergency landing gear extension
Emergency braking

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13
Q

The anti-skid system is inoperative below what speed?

A

15kts

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14
Q

Name and explain the 3 anti-skid protections

A

Touch down protection
Locked wheel protection
Spin up override

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15
Q

Spin up override is used when

A

Airborne/ground microswitch is faulty, and Touch Down protection remains active after landing

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16
Q

In what case (other than malfunction) the anti-skid system is inoperative?

A

In case of emergency brake system

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17
Q

Angle of action of NWS

A

56º

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18
Q

The NWS system is

A

Electrically controlled (button on the stick)
Hydraulically actuated

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19
Q

NWS is active only

A

When on ground

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20
Q

When moving the landing gear control lever, the system energizes the

A

Steering box (but in flight the light must remain off otherwise there is a malunction)
Anti-skid control box

21
Q

When the NWS is not engaged, its hydraulic pressure is used for what?

A

To reduce and prevent nose wheel shimmy

22
Q

Minimum pressure to lower the gear

A

110bar

23
Q

The actuation of emergency lending gear extension excludes what systems?

A

NWS and Anti-skid

24
Q

Micro switch NOSE

A

RATS

RNAV heater
AOA heater
TTS heater
Steering

25
Q

Micro switch LEFT

A

SERACAP

Salvo jettison
Electrovalve hyd circuit separation
Retraction gear on ground (dn lock overr)
Anti-skid
Canopy seal
Anti-ice engine
Pitot annunciators

26
Q

Micro switch right

A

SERA

Salvo jettison
Electrovalve for hyd circuit separation
Retraction of gear on ground (dn lock ov)
Anti-skid

27
Q

Tyre pressure main gear

A

7.5 to 10 bars

28
Q

Nose wheel pressure

A

5 bar

29
Q

Minimum pressure for NWS system

A

70-80 bar

30
Q

Minimum turn radius with NWS

A

8.60 mt

31
Q

The landing gear struct substains sink rate up to

A

720 ft/min

32
Q

Sequence extension of landing gear

A

Handle
Door closed MW
Leg closed MW
Actuators for gear extension
Lights illuminate in the cockpit
Door open MW
Door closed MW
Lights in the cockpit off

During retraction sequence is inverted

33
Q

Emergency hyd system valves for emergency brake and emergency gear extension is located where?

A

In the speedbrake bay

34
Q

What are the valves located in the speedbrake bay and related to emergency hyd system?

A

Emergency brake and parking valve
Selector valve
Pression valve (right priority)

35
Q

When main gear tyre are worn?

A

When you see 2nd canvas overlaying 90º the first 1
(14 canvas total)

36
Q

When nose tyre is considered worn out?

A

When the chined Tyre is smooth for at least 50% of its circumference

37
Q

Max Tyre speed

A

139kts

38
Q

Describe the brake system without anti-skid

A

Hydraulic pressure is sent by applying BEAKES to BRAKE VALVES (mechanically connected to the pedals), goes through COMMAND VALVES (anti-skid) but it is not mitigated. Then to the CHECK VALVES,and so to BRAKE ASSEMBLIES (3 disks 6 brake pads)

39
Q

Maximum allowed for WORN OUT INDICATOR of brakes

A

1mm out

40
Q

In case of simultaneous braking from front and rear cockpit, which one will be prioritized?

A

The stronger one

41
Q

How does emergency braking work?

A

EMER BRAKE HANDLE sends hyd pressure directly to 2 CHECK VALVES that point fluid towards BRAKE ASSEMBLIES

42
Q

Minimum pressure for braking action

A

70 bar

(But with a pressure of 50bar at least 10 applications of brakes should be granted)

43
Q

Anti-skid system components

A

2 anti-skid switches (front and rear)
2 speed sensors
2 WOW MW
Anti-skid Control Box
2 Anti-skid command valves

44
Q

With Anti-skid off, what happens to control box?

A

It is not energized. Therefore command valves stay open and hyd pressure is not mitigated from brakes application to brake assemblies

45
Q

In the brake hydraulic line, where Anti-skid Command Valves are located?

A

In between of Brake Valves and Check Valves

46
Q

NWS system components

A

2 push buttons
Steer light
Steering Control Box
MW consent
Intercepting valve
Steering actuator

47
Q

Intercepting valve in the NWS system, where does intercept hydraulic pressure from?

A

From landing gear system line

(This is why if you pull the emergency extension you don’t have steering anymore)

48
Q

When do you expect to have maximum temperature of hot brakes?

A

5 to 15 min after brakes application

FT-339C (12 decks)

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