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How many gear doors are there on each main gear? 12-1
3
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How are the main gear doors attached to the gear? 12-1
2 doors mechanically linked and a 3rd door that is rigidly attached
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How is the gear door opened during preflight for inspection? 12-1
Pull the release ring
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Does the gear swing forward or aft during retraction? 12-1
Forward
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What is used for normal Gear extension and retraction?
Hydraulic pressure
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What centers the nose wheel for retraction? 12-2
Centering cams within the strut
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What is used to lock the gear in the down position? 12-3
Over center extension and Hydraulic pressure
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What locks the gear up? 12-4
Mechanical up locks
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What is used to open the up lock during normal gear extension? 12-4
Hydraulic pressure
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How many weight on wheel switches per main gear? 12-4
2
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How many weight on wheels on the nose gear? 12-4
0
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How is the gear retracted if a weight on wheel switch fails? 12-4
By pressing the down lock release pushbutton
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What lights illuminate while pressing the gear test button? 12-4
Left, Nose, Right main gear lights and an Amber gear lever light
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Which gear must be locked down for the Amber light to extinguish?
All gear must be down and locked
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When is a CONFIG warning given for an unsafe Landing Gear condition? 12-4
Any gear is not down and locked AND RA <500' AGL, or 1 or both power levers are below the 64 degree angle
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What altitude does the EGPWS provide "to low gear"? 12-4
500' AGL
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At what flap angle with gear not down and locked is a CONFIG WARNING alert given? 12-4
Greater than 15 degrees
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Which CWP light will illuminate if the gear is not locked down by 500' RA? 12-4
CONFIG
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What prevents gear retraction on the ground? 12-5
A spring loaded latch pin
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What does pushing the Down lock release button do? 12-5
Mechanically releases the latch pin
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What is used for emergency extension? 12-7
Gravity, airflow, and assisted by springs
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Does the gear handle have to be in the down position for emergency EXTENSION? 12-7
No
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What's lost if Emergency extension is used and the gear handle is not down? 12-7
Anti-skid arming
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After Emergency extension, will the gear doors be open or closed? 12-7
Open
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During Emergency Extension, what seperates the gear doors from the actuating linkages? 12-7
Explosive bolts
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How are the brake pads preflight checked? 12-9
By observing the wear pins
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What determines if the brake pad wear indicators are within limits? 12-9
If the indicators extend above the circular casing
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How are the brakes operated? 12-9
Hydraulically
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How many brake systems are on the aircraft? 12-9
2, Inboard and outboard brakes
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At what speed does the Anti-skid cut out? 12-10
20 knots
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What protects the tire from over pressure due to brake temperatures? 12-10
Pressure relief blow out plugs
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What is the purpose of the Anti-skid system? 12-10
To limit brake pressure and avoid locked wheels
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How does the Anti-skid determine if a wheel is "skidding"? 12-10
Compares inboard and outboard wheel speed
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What is required for Anti-skid operation? 12-11
Anti-skid switch ON AND landing gear handle down AND PL below flight idle or WOW switch activated or Average Wheel Speed above 50kts
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What is touchdown brake protection? 12-12
Prevents brake application for 3 seconds after main gear compression or wheel speed exceeds 50kts
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Can the brakes be set without getting a CWP light? 12-12
Yes
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Can the brakes be set without the PARK BRK ON CWP light illuminated? 12-12
Yes, (1500psi sets the brake, 1700psi required for light to illuminate)
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At what psi does the PARK BRK ON light extinguish? 12-12
Less than 900psi
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What psi is required for the PARK BRK ON light to illuminate? 12-12
1700psi
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How is the parking brake set? 12-12
Pulling the handle up, rotating 30 degrees clockwise, and pushing the brake pedals
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What does the lockout switch do to the nose wheel steering system? 12-13
When activated, inhibits tiller function to prevent NWS activation during ground handling ops
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When must the nose gear pin be installed? 12-13
During pushback or towing
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How many degrees of steering does the NWS provide? 12-13
60 degrees either side of center
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What does pushing the tiller down do electrically? 12-13
Electrically opens the steering shutoff valve
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What does pushing the tiller down do mechanically? 12-13
Mechanically engages the tiller wheel
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What is the purpose of the C-Clip (gear pin)? 12-13
Deactivates the steering system for ground handling
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What is the max steering deflection for operations? 12-13
120 degrees or 90 degrees (depending on MOD)
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Can the nose wheel rotate all the way around? 12-13
Yes
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What is indicated by an illuminated Anti-skid CWP light? 12-20
A system fault or gear is down with Anti-skid off
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