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737 > landing gear > Flashcards

landing gear Flashcards

1
Q

extend max

A

270kts- .82m

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2
Q

retract max

A

235kts

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3
Q

extended max

A

320kts - .82m

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4
Q

red gear lights mean?

2

A

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)

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5
Q

red gear lights extinguished?

A

gear is either up/down & locked with lever in matching position

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6
Q

green gear lights on

what deactivates?

if only one green light on?

A

relevant gear is down & locked.

(gear horn deactivated with all gear down & locked)

gear is down & locked as long as one green light on

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7
Q

gear lever positions

A

up

down

off. (hyd px removed from ldg gear sys)

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8
Q

can you override gear lever?

A

yes. using trigger

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9
Q

is lever required to be down to manually extend?

can you retract gear again?

A

no. can be any position.

no. retraction is disabled.

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10
Q

if manual extension access door is open ?

3 things

A
  • 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
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11
Q

manual extension gear handles pulled to limit of?

A

24 inches

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12
Q

brake temp range

total

white (norm)

high (amber)

A
  1. 0 - 9.9
  2. 0 - 4.9

above 4.9

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13
Q

full push of pedal = turns nose wheel how many degrees ?

A

7 degrees

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14
Q

tiller will turn nose wheel how many degrees?

A

78 degrees

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15
Q

hyd system A does what for gear?

3

A

extend

retract

nose wheel steering

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16
Q

Hyd sys B does what for gear?

A

normal brakes

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17
Q

is there landing gear lever lock?

what?

override?

in flight?

A

yes.

on the ground. prevents gear being selected up.

yes override switch bypasses lock.

in flight, air/ground solenoid will open lock

18
Q

when selected up, how do the main wheels stop spinning

A

during retraction the brakes automatically stop rotation

19
Q

main gear held up by?

A

mechanical up locks

20
Q

nose wheels retract forward or back?

A

forwards

21
Q

nose wheel stopped spinning by?

A

snubbers

22
Q

nose wheel held.up by?

A

over center lock

enclosed by doors.which are mechanically linked to gear.

23
Q

gear extension

hyd system?

sequence? locks?

A

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

24
Q

if damaged main gear tyre? safety feature?

A

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.

25
Q

which Hyd system used for raising gear?

A

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.
26
Q

can gear be normally retracted after a manual extension?

A

yes
providing Hyd sys A px avaliable.

  • close manual extension door
  • move gear lever to down
  • move gear lever up.
27
Q

will nose wheel steering deactivate at any point?

what about depressurise?

A

yes

when nose wheel strut extends

yes
when lockout pin is installed in towing lever.
(allows pushback or towing without depressurising entire hyd system)

28
Q

all wheels have brakes?

powered by?

included in system?

A

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
29
Q

brake accumulator px by?

purpose?

A

Sys B

if norm & ALT px lost? = trapped px in accumulator still enough for several applications or park brake application.

30
Q

Anti skid

provided on which sys?

if total hyd sys loss?

A

both normal & ALT

still works.

31
Q

what does antiskid sys include?

4

A
  • skid
  • locked wheel
  • touchdown
  • hydroplane protection
32
Q

how is normal vs ALT anti skid sys different?

A

norm = on EACH main gear. individually.

ALT = applied to wheel PAIRS.

33
Q

when anti skid sys detects a skid, what happens?

A

Anti skid valve on relevant wheels reduces brake px until skidding stops.

34
Q

what’s Autobrake sys?

powered by?

A
  • provides max deceleration for rejected TO
  • auto braking immediately after touchdown

hyd sys B

35
Q

Autobrake sys work on norm & ALT systems?

simultaneous with anti skid?

A

no just normal.

yes

36
Q

to arm RTO mode prior to take off, what conditions?

5

A
  • AC in gnd
  • antiskid & auto brake sys operational
  • AUTO BRAKE select switch on RTO
  • wheel speed less than 60kts
  • fwd thrust levers to IDLE
37
Q

on selecting RTO mode on Autobrake sys, what should you see?

A

AUTO BRAKE DISARM light illuminates for couple of seconds then goes out.
= self test successful.

38
Q

what will Autobrake RTO mode do?

speed?

A

max braking applied automatically when thrust levers retarded to idle.

only above 90kts.
below = sys remains armed, AUTO BRAKE DISARM light remains out.

39
Q

when is RTO mode auto disarmed?

will disarm light come on?

A

when air/gnd sys sense air mode.

no

40
Q

how to reset or manually DISARM Autobrake sys?

A

put switch to OFF.

41
Q

if landing made with RTO sys selected, what will happen?

A

nothing.No auto braking will happen.

AUTOBRAKE DISARM light will come on 2 sec after touchdown.

42
Q

parking brake

powered by which sys?

if there’s a fault which light might you see?

safety feature for take off?

A

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.

737 (7 decks)

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