Landing Gear Flashcards
What type of landing gear configuration does the PC-12 have?
Tricycle
How is the landing gear actuated?
Hydraulically
What is VLO?
177 knots
What is VLE
236 knots
How is nose wheel steering accomplished?
Controlled with the rudder pedals.
12 degrees with just rudder.
60 degrees with differential braking.
What type of strut does the nose gear have?
A fluid and nitrogen filled strut.
What assists the nose gear in free falling during emergency extension?
A spring strut.
What holds the nose gear down?
An over-center drag brace.
Does all landing gear completely retract into the plane?
The nose gear does, the mains protrude approximately 1”.
What type of main gear is on the PC-12?
Trailing-link.
What holds the main gear down?
Mechanical down locks.
What type of system is used for landing gear operation?
A hydraulic system separate from the system for brakes with a single DC electrically driven motor.
Where is the landing gear hydraulic motor located?
Located in the left wing root behind the main spar.
What cools the landing gear hydraulic motor and what happens if it motor overheats?
It has a cooling fan.
If the motor overheats electric power will be removed. Once the motor cools it will operate again.
What prevents the hydraulic motor from cavitating during low temperature operations?
The fluid reservoir is pressurized.
How do we check landing gear hydraulic reservoir and pressure on the preflight?
The sight glass and pressure gauge which are visible inside the cargo door frame at the root of the wing.
What is type of redundancy is included in case of a hydraulic power pack failure?
A nitrogen charged accumulator which will hold the gear in the up position for 200 minutes.
How does the nitrogen accumulator function?
A pressure switch is located in the accumulator and controls the operation of the power pack.
What are the PSI ranges for triggering the power pack to increase pressure?
Activates power pack below 2,450.
Deactivates power pack between 2,725 and 2,875.
What would trigger a “CAWS HYDR” message?
If system pressure drops below 1800 PSI.
How long does a normal landing gear cycle take?
12 seconds.
How is inadvertent gear retraction on the ground inhibited?
Locking the selector handle in the down position with a spring loaded solenoid via WOW.
In the event of a power pack failure or the system was auto-shed how do we extend the gear?
Pull the HYDR CTL CB and ensure airspeed is below 110 kts.
The gear should free-fall when the handle is placed in the down position.
If the gear does not fall you may have to use the hand pump up to 60 strokes.
How is the landing gear extended position relayed to the dual indication lights?
Micro switches on the main gear actuators and a proximity switch on the nose gear landing drag link.
How is the landing gear retracted position relayed to the dual indication lights?
Proximity switches on the gear doors.
What triggers the aural gear unsafe warning?
When the gear is not locked down and:
1) Below 130 knots and torque below 10 PSI.
2) Flaps beyond 15 (cannot be silenced).
In flight what will trigger a “CAWS HYDR”?
1) System pressure below 1,800 PSI.
2) Power pack has been in operation for more than 10 minutes.
On the ground what will trigger a “CAWS HYDR”?
If the power pack is cycled more than 6 times in one hour.
What will trigger a “CAWS AIR GND”?
A disagree between LH and RH WOW after 10 seconds.
What is connected to the LH WOWs?
LCCEH
1) LH Stick Pusher.
2) Cabin pressurization and control system.
3) CAWS
4) EIS
5) Hydraulic system control.
What is inhibited on the GROUND by the Air/Ground System?
1) Gear up selection/Hydraulics
2) Pressurization
3) TAS/EGPWS
4) Transponder enters ground mode.
What does the right hand WOWs do?
Verifies the left side.
When will you get an aural Gear Unsafe warning?
Below 130 knots and torque below 10 PSI.
Flaps beyond 15 degrees (cannot be silenced).
In flight when does CAWS HYDR illuminate?
System pressure below 1,800 PSI.
Power Pack has been in operation for more than 10 minutes.
On the ground when would you get a CAWS HYDR?
Illuminates when you land if the packs cycled more than 6 times in one hour.
