ORAL * E145 Landing Gear and Brakes Flashcards
How Many WOW sensors?
5…2 each main, 1 nose
Nose WOW switch used by what?
Thrust reverser logic and steering control
How do mains doors operate?
Mechanically linked with an arm to landing gear leg
How does nose door operate?
Hydraulically actuated and operate in sequence with the nose gear
Landing Gear Lever is
Electric, and is linked to the LGEU Landing Gear Electronic Unit
During retraction how does LGEU control retraction?
Handle in UP commands Nose Gear Door Solenoid Valve and Landing Gear Electrovalve…This allows pressure from HYD system 1 to reach the down unlock actuators and the landing gear actuators
After landing gear up and locked what happens?
Gear sensed up and locked and nose gear door closes then landing gear electrovalve is depressurized
Why can’t you move lever on ground
Ground prox switch locks it
Can you over ride lever?
Yes, with an unlock button
What does override do?
Bypasses LGEU and directly actuate gear valves
How does Free Fall release gear?
Mechanically unlocks the unlocks and depressurizes the lines
When does Landing Gear voice message occur?
< 1200 ft and idle, any flap condition, can cancel
<1200 ft and idle, flaps 22, cannot cancel
Flaps 45 any alt, cannot cancel
How to cancel Gear warning audio
Guarded Button on center pedestal
In the GEAR WARNING Button amber bar…when will it go away?
Put the gear down, or flaps 22 or greater or advance the thrust,
If RA failed does landing gear warning work?
Yes, it triggers at any altitude
LG/Lever disagree when?
Gear isn’t in position after 20 seconds
Gear is in transit…what is on EICAS?
Amber/black hatches
Where do landing gear down and locked indications appear?
EICAS, and RMU engine backup page
Landning gear lever disagree shows how?
Red/Black cross hatched boxes on EICAS
BCV Valves..ow many
4 one on each wheel
What are normal braking protections?
Anti Skid, Wheel locked, and touchdown protection
Anti skid auto above what speed?
10 knots
Locked Wheel Protiection at what speed?
30 knots
Touchdown protection prevents brakes until
3 seconds WOW, or 50 knots on wheels
What stops wheel spin on retractions
Brakes on mains, and a stopper in the nose
Emergency Brake Protections?
Overrides all
Can you adjust brake pressure with emergency handle?
Yes
If you pull emergency brake how is it actuated?
Mechanically
What HYD system on Emergency Brake?
2, from system 2 accumulator
Emergency Brake indication on?
BRAKE ON
EMRG BRK LO PRESS…can emergency brake be used?
Yes, Once if there’s no leakage
How many uses of emergency brake with accumulator only
6…or 24 hours of emergency brake sitting still
How to set emergency brake?
Press brake pedals in set or release
BRAKE OVERHEAT?
450C
on MFD, indications are green when?
At or below 250C
Nosewheel steering…which HYD system?
HYD 1
Nose wheel steering with pedals?
5 degrees
Steering with pedals and steering handle?
76 degrees
Steering with Steering handle only?
71 degrees
Steering system shuts off if rudder inputs displaces wheel how much?
7 degrees…reset with steering handle
How do you manually disengage steering
Button on control wheel…allows castering
What caution message if you push Steering Disengagement Button?
STEER INOP
How do you reset steering
Push down on steering handle
Priority..Steering Handle or Disengagemtn button?
Handle
VLO Up….Down? Down and Locked?
200 up, 250 down, and down and locked
Brake wear…how do you tell?
Brake wear indicators on the brake assembly. (Pins) When they’re flush, replace
