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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

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- 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