Landing Gear and Brakes Flashcards
DN LOCK REL button
mechanically releases the landing gear lever down lock solenoid
Alternate Gear Extension Lever
when pulled, relieves hydraulic pressure in the landing gear lines and releases all landing gear uplocks
Alternate Gear Extension Lever Unlock pushbutton
releases the handle from the fully extended position
Electrical Override Switch NORMAL/GEAR DOWN
NORMAL - landing gear lever performs landing gear retraction and extension
GEAR DOWN - electronically bypasses the PSEM, opens the forward and aft doors and extends the landing gear
Landing gear warning activates when:
- flap selector lever set to 5 or FULL with gear not down and locked or
- slat/flap 0-4 and RA below 700 agl and either thrust lever below 45 degrees (2 engines) or thrust lever below 59 degrees (1 engine)
the brake control module (BCM) functions are:
- locked wheel protection
- antiskid protection
- automatic wheel braking
- touchdown protection
When is locked wheel protection active
on ground and wheel speed above 30 kts
When is antiskid protection deactivated
below 10 kts
How many emergency brake applications do the accumulators provide
six full brake applications
max steering angle using hand wheel steering
+76 degrees until 40 knots then decreases linearly to 7 degrees at 100 knots
max steering angle using rudder
+-7 degrees
the free wheel mode is auto selected when
- air/ground system failure
- steering angle greater than 76 degrees
- steering system failure
minimum runway width for turn 170/175
170 - 54 ft 8 in
175 - 59 ft 2 in
LG LEVER DISAG warning
a discrepancy between the position of the landing gear control lever and at least on landing gear is detected
BRK OVERHEAT caution
brake temp has exceeded normal range
EMER BRK FAIL caution
both brake accumulator pressures are low and low pressure of hyd systems 1 and 2 detected
BRK LH or RH FAIL caution
loss of both wheel brakes of either the left or right landing gear
LG NO DISPATCH caution
landing gear dispatchability is affected
LG NOSE DOOR OPEN caution
nose landing gear is locked up and nose landing gear door is open
LG WOW SYS FAIL caution
indicates a failure condition in the WOW indication system
PRK BRK NOT RELEASED caution
parking brake not fully released
STEER FAIL caution
indicates a steering system failure condition when the landing gear is down
BRK CONTROL FAULT advisory
at least one pressure transducer has failed, associated wheel operates with degraded braking capability
BRK LH or RH FAULT advisory
one pedal of the left or right hand seat has failed
BRK PEDL LH or RH SEAT FAIL advisory
one pedal of the left or right hand seat has failed
EMER BRK FAULT advisory
pressure on one brake accumulator is low or the inboard and outboard park brake pressures are in disagreement
LG TEMP EXCEEDANCE advisory
indicates non dispatch condition related to the landing gear after a brake overheat
STEER FAULT advisory
steering system is degraded
STEER OFF status
steering is disconnected
