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7/26/2019 2 Landing Gear
http://slidepdf.com/reader/full/2-landing-gear 1/2
TUBANG
III. NOSE WHEEL STEERING
SYSTEM
a. Small Aircraft- Often uses a simple system of
mechanical linkage (e.g.: Push-pull
o! system" connecte! to the
u!!e pe!als.
b. Large Aircraft- Utili#es a po$e souce (e.g.:
hy!aulic po$e" fo nose $heel
steeing.
c. Shimmy Damper- A small hy!aulic shock a%so%e
that is installe! %et$een the nose-
$heel fok an! the nose-$heel
cylin!e.• Shimmy – an abnormal
vibration• Damper – from the word
damp, to minimize or lessen
in activity
I!. LANDING GEAR ALIGNMENT"
S#$$ORT AND RETRA%TION
a. Wheel Alig&me&t- To maintain pope to$-in o t$o-
out an! pope cam%e.
- Camber of a wheel is the amount
the wheel is tilted out of the
vertical plain. It can be measured
with a bubble protractor.
b. S'pp(rt- Tunnion is a xed structural
support that is part of or attached
to the upper strut cylinder of a
landing gear strut. It contains
bearing surfaces so the gear can
retract.
c. Small Aircraft Retracti(& Sytem- The simplest etaction system
!esign contains a le&e in the
'ight !eck mechanically linke! to
the gea.- lectic)*y!aulic +ystem (Po$e
Pack +ystem"• A small lightweight
hydraulic power pack
containing several
components reuired in a
hydraulic system.
). Large Aircraft Retracti(& Sytem- Nealy al$ays po$ee! %y
hy!aulics. Othe !e&ices use!
inclu!es:• Actuating cylin!es• +electo &al&es• Up-locks , o$n-locks• Tu%ing• An! othe con&entional
hy!aulic system
components
e. Emerge&cy E*te&i(& Sytem
7/26/2019 2 Landing Gear
http://slidepdf.com/reader/full/2-landing-gear 2/2
TUBANG
- o$es the lan!ing gea if pimay
metho! of lo$eing the gea fails.
+ome metho!s use!:• /echanical• Altenate *y!aulic• 0ompesse! Ai• 1ee-fall techni2ues
- In all cases3 the emegency
e4tension system5s pupose is toelease the up-locks an! mo&e the
gea to the !o$n an! locke!
position.
f. La&)i&g Gear Safety De+ice- Safety S,itch - this is a switch
positioned to open and close
depending on the extension or
compression of the main landing
gear strut.
- Gr('&) L(c - commonly used
on aircraft landing gear as extra
insurance that the landing gear
will remain down and locked while
the aircraft is on the ground. Can
be as simple as a pin placed into
the pre!drilled holes of gear
components that keep the gear
from collapsing.
! Gear I&)icat(r ! used to inform
the pilot of gear position status.
! N(e Wheel %e&teri&g !
centering cams built into theshock strut structure accomplish
the aligning of the nose gear
before retraction is needed.
!. LANDING GEAR RETRA%TION %HE%/
Also kno$n as s$inging the gea.
6etaction tests ae pefome! at &aious
times3 such as: uing annual inspection
A!7ustments to lan!ing gea
linkages o components that a8ect
gea system pefomance ae
ma!e Afte a ha! o o&e$eight lan!ing
9hile attempting to locate a
malfunction $ithin the system