landing gear Flashcards
extend max
270kts- .82m
retract max
235kts
extended max
320kts - .82m
red gear lights mean?
2
gear not down & locked
(with either or both thrust levers retarded to idle & below 800ft AGL)
gear is in disagreement with gear lever (in transit or unsafe)
red gear lights extinguished?
gear is either up/down & locked with lever in matching position
green gear lights on
what deactivates?
if only one green light on?
relevant gear is down & locked.
(gear horn deactivated with all gear down & locked)
gear is down & locked as long as one green light on
gear lever positions
up
down
off. (hyd px removed from ldg gear sys)
can you override gear lever?
yes. using trigger
is lever required to be down to manually extend?
can you retract gear again?
no. can be any position.
no. retraction is disabled.
if manual extension access door is open ?
3 things
- gear extension is possible with lever in any position
- normal extension is still possible if hyd system A px is avaliable
- gear retraction is disabled
manual extension gear handles pulled to limit of?
24 inches
brake temp range
total
white (norm)
high (amber)
- 0 - 9.9
- 0 - 4.9
above 4.9
full push of pedal = turns nose wheel how many degrees ?
7 degrees
tiller will turn nose wheel how many degrees?
78 degrees
hyd system A does what for gear?
3
extend
retract
nose wheel steering
Hyd sys B does what for gear?
normal brakes
is there landing gear lever lock?
what?
override?
in flight?
yes.
on the ground. prevents gear being selected up.
yes override switch bypasses lock.
in flight, air/ground solenoid will open lock
when selected up, how do the main wheels stop spinning
during retraction the brakes automatically stop rotation
main gear held up by?
mechanical up locks
nose wheels retract forward or back?
forwards
nose wheel stopped spinning by?
snubbers
nose wheel held.up by?
over center lock
enclosed by doors.which are mechanically linked to gear.
gear extension
hyd system?
sequence? locks?
lever moved down.
Hyd sys A px used to release uplocks
gear extends by hyd px, gravity & airloads.
over center mech & hyd locks hold gear down
if damaged main gear tyre? safety feature?
to avoid damaging components, if a spinning tyre with loose thread impacts the well opening retraction will stop.
free fall back to down position & unable to be retracted until replaced.
which Hyd system used for raising gear?
B
through landing gear transfer unit.
will do it at normal rate providing:
- airborne
- No 1 engine RPM drops below limit value
- gear lever positioned up
- either main gear is not up & locked.
can gear be normally retracted after a manual extension?
yes
providing Hyd sys A px avaliable.
- close manual extension door
- move gear lever to down
- move gear lever up.
will nose wheel steering deactivate at any point?
what about depressurise?
yes
when nose wheel strut extends
yes
when lockout pin is installed in towing lever.
(allows pushback or towing without depressurising entire hyd system)
all wheels have brakes?
powered by?
included in system?
no, only mains
Hyd sys B normal
hyd sys A alternate (automatic)
normal sys ALT sys brake accumulator antiskid protection autobrake sys parking brake brake temp indication
brake accumulator px by?
purpose?
Sys B
if norm & ALT px lost? = trapped px in accumulator still enough for several applications or park brake application.
Anti skid
provided on which sys?
if total hyd sys loss?
both normal & ALT
still works.
what does antiskid sys include?
4
- skid
- locked wheel
- touchdown
- hydroplane protection
how is normal vs ALT anti skid sys different?
norm = on EACH main gear. individually.
ALT = applied to wheel PAIRS.
when anti skid sys detects a skid, what happens?
Anti skid valve on relevant wheels reduces brake px until skidding stops.
what’s Autobrake sys?
powered by?
- provides max deceleration for rejected TO
- auto braking immediately after touchdown
hyd sys B
Autobrake sys work on norm & ALT systems?
simultaneous with anti skid?
no just normal.
yes
to arm RTO mode prior to take off, what conditions?
5
- AC in gnd
- antiskid & auto brake sys operational
- AUTO BRAKE select switch on RTO
- wheel speed less than 60kts
- fwd thrust levers to IDLE
on selecting RTO mode on Autobrake sys, what should you see?
AUTO BRAKE DISARM light illuminates for couple of seconds then goes out.
= self test successful.
what will Autobrake RTO mode do?
speed?
max braking applied automatically when thrust levers retarded to idle.
only above 90kts.
below = sys remains armed, AUTO BRAKE DISARM light remains out.
when is RTO mode auto disarmed?
will disarm light come on?
when air/gnd sys sense air mode.
no
how to reset or manually DISARM Autobrake sys?
put switch to OFF.
if landing made with RTO sys selected, what will happen?
nothing.No auto braking will happen.
AUTOBRAKE DISARM light will come on 2 sec after touchdown.
parking brake
powered by which sys?
if there’s a fault which light might you see?
safety feature for take off?
A or B or accumulator
ANTISKID INOP
part of take off config warning sys.
if either thrust lvr is advance for TO, light & horn will sound.
