LANDING GEAR

Question 1

What type of landing gear?

Answer 1

• electrically activated
• hydraulically operated
• fully retractable
• tricycle landing gear

Question 2

Normal operation

Answer 2

• electrically powered
• reversible hydraulic pump
• pump activated by a two-position gear selector

Question 3

Hydraulic pump operation

Answer 3

• when hydraulic pressure exerted in one direction the gear is retracted
• exerted in the other direction gear is extended
• hydraulic fluid moves from one side of each landing gear actuator to the other
• fluid moves the piston connected to an actuator rod
• extension & retractions takes 6-7 seconds

Question 4

Electrical limit switches

Answer 4

• when gear is fully extended or retracted
• stops the flow of current to the motor of the hydraulic pump

Question 5

How does the landing gear stay in place?

Answer 5

• spring assists in gear extension & locking the gear in the DOWN position
• when gear is down, the down-lock hooks engage
• springs maintain force on each hook to keep it locked until released by hydraulic pressure

Question 6

MAX Speeds

Answer 6

Max extension: 140 KIAS
Max retraction: 109 KIAS
Max emergency extension: 100 KIAS

Question 7

Microswitches

Answer 7

• located in the landing gear system
• determines full up or down and locked position
• signals from the microswitches are displayed on MFD

Question 8

Squat Switch

Answer 8

• left & right main gears have it
• determines if the airplane is airborne or still on the ground
• on the ground switch is not depressed & in the air it becomes depressed
• prevent hydraulic pump from actuating when BATT MSTR ON

Question 9

Over-center join

Answer 9

• keeps the gear down in the event of a side-loaded landing

Question 10

Shuttle valve

Answer 10

• moves back & forth
• hydraulic pressure moves either side to allow pressure to move

Question 11

CHECK GEAR CAS

Answer 11

• gear not down & locked manifold pressure below 14 inches (one or two engines)
• gear selector UP when a/c on ground
• gear not down & locked wing flaps extended to 2nd or 3rd notch
• above/below 400 AGL

Question 12

Emergency extension

Answer 12

• design to extend in an event of hydraulic failure
• gear held in place by hydraulic pressure
• lost of hydraulic pressure, gravity will extend the gear
• releases the hydraulic pressure, falls freely

Question 13

Ground operations of nose wheel

Answer 13

• nose gear steerable 30 degrees either side
• gear centering spring (prevents shimmy tendencies)
• bungee assembly (dampens shocks/bumps)
• when retracted the nose wheel centers steering linkage is disengaged to reduce pedal loads

Question 14

Thermal relief valve

Answer 14

• valve will open to receive pressure as a result of temperature and pressure changes as a/c climbs or descends

Question 15

Squat switch

Answer 15

• prevents gear from retracting on ground by not activating hydraulic pump when BATT MASTR is on
• records tach time
• weight on wheels
• turns blower to ram air

Question 16

Beware of toggling between UP or DOWN when gear is in transit

Answer 16

• if the landing gear is in transit and hydraulic pump is running, do not move gear selector to opposite position if gear hasn’t reached its full travel limit
• sudden reversal may damage hydraulic pump

Question 17

Squat switch on T/O

Answer 17

• landing gear oleo strut drops to full extension
• safety switch closes allowing hydraulic pump to raise gear

Question 18

Hydraulic reservoir

Answer 18

• integral part of the landing gear system
• located through a panel in the baggage compartment area

Question 19

Struts of the landing gear

Answer 19

• air oil assemblies