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FT-339C > Landing Gear > Flashcards

Landing Gear Flashcards

(49 cards)

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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

Study These Flashcards
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?

Study These Flashcards
A

To reduce and prevent nose wheel shimmy

22
Q

Minimum pressure to lower the gear

23
Q

The actuation of emergency lending gear extension excludes what systems?

Study These Flashcards
A

Speedbrake
NWS

24
Q

Micro switch NOSE

Study These Flashcards
A

RATS

RNAV heater
AOA heater
TTS heater
Steering

25
Micro switch LEFT
SERACAP Salvo jettison Electrovalve hyd circuit separation Retraction gear on ground (dn lock overr) Anti-skid Canopy seal Anti-ice engine Pitot annunciators
26
Micro switch right
SERA Salvo jettison Electrovalve for hyd circuit separation Retraction of gear on ground (dn lock ov) Anti-skid
27
Tyre pressure main gear
7.5 to 10 bars
28
Nose wheel pressure
5 bar
29
Minimum pressure for NWS system
70-80 bar
30
Minimum turn radius with NWS
8.60 mt
31
The landing gear struct substains sink rate up to
720 ft/min
32
Sequence extension of landing gear
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
Emergency hyd system valves for emergency brake and emergency gear extension is located where?
In the speedbrake bay
34
What are the valves located in the speedbrake bay and related to emergency hyd system?
Emergency brake and parking valve Selector valve Pression valve (right priority)
35
When main gear tyre are worn out?
When you see 2nd canvas overlaying 90º the first 1 (14 canvas total)
36
When nose tyre is considered worn out?
When the chined Tyre is smooth for at least 50% of its circumference
37
Max Tyre speed
139kts
38
Describe the brake system without anti-skid
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
Maximum allowed for WORN OUT INDICATOR of brakes
1mm out
40
In case of simultaneous braking from front and rear cockpit, which one will be prioritized?
The stronger one
41
How does emergency braking work?
EMER BRAKE HANDLE sends hyd pressure directly to 2 CHECK VALVES that point fluid towards BRAKE ASSEMBLIES
42
Minimum pressure for braking action
70 bar (But with a pressure of 50bar at least 10 applications of brakes should be granted)
43
Anti-skid system components
2 anti-skid switches (front and rear) 2 speed sensors 2 WOW MW Anti-skid Control Box 2 Anti-skid command valves
44
With Anti-skid off, what happens to control box?
It is not energized. Therefore command valves stay open and hyd pressure is not mitigated from brakes application to brake assemblies
45
In the brake hydraulic line, where Anti-skid Command Valves are located?
In between of Brake Valves and Check Valves
46
NWS system components
2 push buttons Steer light Steering Control Box MW consent Intercepting valve Steering actuator
47
Intercepting valve in the NWS system, where does intercept hydraulic pressure from?
From landing gear system line (This is why if you pull the emergency extension you don’t have steering anymore)
48
When do you expect to have maximum temperature of hot brakes?
5 to 15 min after brakes application
49
In case of hot brakes how would you park the aircraft?
In the hammerhead, with wind blowing from the right

FT-339C (12 decks)

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