Landing Gear Flashcards
Describe how anti skid systems works
Compares wheel tachometer speed vs aircraft ref speed
If wheel speed <0.87 a/c ref speed
Indicates a skid
Closes anti skid valve
Brake press released to prevent lock up
Parking brake off which HYD system?
Yellow
What happens to other braking systems when parking brake is on?
Deactivates all other systems
When does an arc come over brakes?
Hottest brake over 100C
When does brake temp ECAM caution come on?
> 300 C
3 modes alternate braking can operate
1) AB WITH ANTI SKID
2) AB WITHOUT ANTI SKID
3) AB WITHOUT ANTI SKID ACC PRESS
Which computers control in these schenario
1) AB WITH ANTI SKID
2) AB WITHOUT ANTI SKID
3) AB WITHOUT ANTI SKID ACC PRESS
1) ABCU BSCU
2) ABCU
3) ABCU
Green HYD pressure unavail what happens to braking systems?
Auto switches to yellow ALT BRAKING with ANTI SKID AVAIL
What happens when anti skid nose wheel steering is turned off?
Green hyd sys is shut off
Anti ski deactivated
Yellow sys supplies brakes (alt)
Differential braking is ok (NWS off)
Primary and secondary methods of steering
Prim - tiller
Sec - rudder and ap
Rudder speed effectiveness graph
+- 6 deg
Up to 40kt same
Slopes off down to 130 (nil)
Hand wheel effectiveness graph
+- 75 deg
20-80 (nil)
Rudder pedals do not provide steering after what speed?
130kt
Steering angle when on tow?
+/- 85 deg
When does LGCIU switch over
Switch’s over after 1 complete cycle
How many LGCIU triangles feed ECAM SD page?
How many to confirm gear is down
LGCIU 1 and 2
Only one triangle per wheel needed
VLO RETRACT
220
VLO EXT
250
VLE - what is it?
Speeds
Gear extended speed
280 M.67
Door speeds may be less - check ECAM
Auto-brake Low
4 sec after spoiler deployment
1.7m/sec 2
Medium autobrake
2 sec after spoiler deployed
3m/s2
Max autobrake
No delay
Max braking
When does decel light come on?
80% decel rate achieved
Decel light ‘health warning’
May not come on on contaminated runways
BUT autobrake may still work
