airframes test 2

97問 • 2年前

問題一覧

what are the main types of landing gear?

1. conventional 2. tricycle 3. tandem 4. floats/skis

what are the advantages of conventional landing gear?

1. low maintenance 2. good clearance between ground and propellor 3. good ground moveability 4. good rough terrain handling in snow and off strip

what are the disadvantages of conventional landing gear?

1. subject to ground looping 2. subject to nosing over 3. requires more servicing 4. poor forward visibility when taxiing

advantages of tricycle landing gear?

1. better ground control in cross wind landings 2. will not ground loop 3. will not nose over 4. good forward visibility for taxiing

disadvantages of tricycle landing gear

1. requires more servicing 2. propeller closer to the ground when taxiing 3. poor rough terrain handling 4. poor forward visibility when taxiing

where would you commonly find tandem landing gear?

gliders and heavy bombers, two or more main wheels, located on belly of aircraft

vertical fins (finlets) may be added to the AFT of the aircraft to give the aircraft ____?

longitudinal stability

water rudders are often used to steer the A/C on water, can they be retracted during flight?

yes, they can be retracted

what is removed for installation of of floats on an aircraft?

under carriage

floats need a buoyancy of ___% in excess of the bouyancy required by that float, to support its portion of max weight

80%

seaplanes > 5000lbs should stay afloat when ____ compartments of any floats are flooded?

each main float must contain at least ____ water tight compartments equal in volume

4 compartments, equal in volume

the hull of a hull seaplane of 1500lbs or more max weight must have ____ compartments designed and arranged so that the hull, auxiliary floats, and tires will keep the plane ___?

•water tight compartments •afloat

max water tight compartments for aeroplanes of 5000lbs or greater weight, any ___ adjacent compartments are flooded. for aeroplanes from 1500lbs-5000lbs any ___ compartment is flooded

• two • one

what supports and attaches the floats to the A/C?

struts

what allows access into the inside of the float

inspection cap

what is allows tying an aircraft to a dock?

bollard

what part of the float absorbs the shock?

float bumper

what is a straight line (point or strip of metal) to keep A/C straight in the water?

keel

runs parallel to the keel?

sister keel

a drop in the bottom of the float to prevent low pressure?

step

intersection of the bottom and side of the float?

chine

a blade used for steering on water?

water rudder

deflects water from propellor ?

splash rail

what keeps floats apart?

spreader bars

used to rig floats parallel to each other?

boxing wires

used to rig floats parallel to the “aircraft”

cross bracing wires

watertight wall in float to prevent water from entering complete float?

bulkhead

what are different types of skis?

1. retractable 2. wheel skis 3. conventional

attaches to front of the ski and aircraft to keep ski front in the correct angle “toe up”

shock chord

attaches to front of the ski and aircraft to prevent the ski nosing down

safety chord

what on the aircraft ski cuts hard snow?

crust cutter

attaches to the rear of the ski and to the aircraft

check cable

joins the ski to the aircraft wheel axle

pedestal

what ski type consists of a solid surface made from wood, metal or composite material?

conventional

what ski mounts on an aircraft with the wheel protruding through a small amount?

wheel ski

what ski is mounted on A/C with wheel?

retractable

helicopter floats are installed how?

using their own attaching structures and hardware

what are common methods for retracting landing gear?

1. mechanical 2. hydraulic 3. electronic

non-absorbing landing gear can be made of?

1. Rigid steel 2. spring steel 3. composites 4. bungee chord construction

non-absorbing landing gear transmits some or all of the landing gear forces to the ?

airframe

rigid steel type landing gear is most common in older aircraft?

true

a spring steel gear strut is usually made of ____ or ____ spring steel

flat leaf or tubular

bungee type landing gear may come in what form factors?

bungee chords, rubber donut

what is contained within the upper chamber (cylinder) of the oleo

nitrogen charge

what is contained in the lower chamber (piston) of the oleo?

hydraulic fluid

what acts as a passage for fluid during compression and extension in an oleo strut?

orifice

what controls the rate of fluid flow through the orifice between the lower chamber and upper chamber in an oleo?

tapered metering pins

what prevents too rapid extension of the shock strut and reduces the rebound during the extension stroke?

recoil valve, snobber tube

what helps keep contaminants like dirt, mud, ice, snow off the piston and out of the lower seals?

wiper ring

what absorbs shocks during taxing and maintains correct oleo extension?

compressed nitrogen

high pressure valve cores similar to a tire valve, sometimes has “H” embossed on the head, rated for what pressure?

greater than 2000 psi

how would you open and close a high pressure air value that does not feature an “H” lettering?

3/4” nut

what component allows the piston to move freely in and out of the cylinder, but prevents it from rotating?

torque links

what is a shimmy damper?

a small hydraulic shock absorber that is installed between the aircraft structure and the nose gear cylinder

a small hydraulic shock absorber that is installed between the aircraft structure and the nose gear cylinder?

shimmy damper

different types of shimmy dampers?

1. piston type 2. non-hydraulic type 3. vane type

what shimmy damper operates like so? restricted flow through a bleed hole in the piston dampens the oscillations

piston type

what shimmy damper operates like so; the gear oscillation is dissipated by the rate of fluid flow?

vane type

what shimmy damper operates like so? the rubbing action between the piston and the housing provides the damping

non-hydraulic type

what supports the landing gear forward and AFT

drag strut

what supports the landing gear sideways ?

side strut

what prevents the gear retraction when aircraft is on the ground?

WOW (safety switch)

what provides a pivot point for the gear to swing during retraction or extension?

torque tube (trunnion)

what ensures certain components operate before others (doors before gear retracts)

sequence valves

what colour of light would indicate the gear is down and locked?

green

what colour of light would indicate landing gear door is open?

amber

what colour of light would indicate the gear is in transit?

red

what colour of light would indicate the gear is up and locked?

no light

what component locks the landing gear in the down position ?

down lock pin

what provides a secondary passage for emergency extension?

shuttle valves

when free fall release is not practical or is impossible due to air-loads or gravity, the forceful extensions made by?

1. hydraulic fluid pressure 2. separate electric driven pump 3. compressed air cylinder 4. manual hand crank

what are the postions of the landing gear selector?

1. Up 2. Down 3. neautral

what does the automatic extension system sense in order to determine when to deploy?

airspeed

how are skis fitted to helicopters?

directly to the bottom of the skid

with rigid landing gear, the elasticity of the tires can take some of the shock ?

true

which type of landing gear is prone to stress failures if it’s not able to deflect?

spring steel

what ensures there is a proper seal between the outer cylinder and piston in an oleo strut system?

packing, O-ring

where should you consult for service instructions regarding the oleo strut system?

AMM

WOW switch use what form of sensing system?

1. mechanical switch (micro switch) 2. proximity sensor

what must you ensure prior to conducting maintenance on a grounded airplane?

ground locks are installed

what part of the oleo forces the wheels straight ahead ?

nose gear cantering cam

what forms of steering disconnects can be found on aircraft?

1. disconnect pins 2. hydraulic bypass valve pin 3. nose wheel caster detent

if you were on the ground and attempted to retract the landing gear, what would be the cockpit indication?

horn will sound

what are ground locks?

pins that are inserted into landing gear mechanisms to prevent retraction of gear when engine is off

does WOW switch provide info on other Aircraft systems? such as engine thrust, avionics, brakes/ anti skid, flight controls, pressurization?

Yes

pulling the emergency free fall valve allows?

fluid to return to reservoir by weight of falling gear

on a piper seninole, what shuts off hydraulic pumps when gear is down and locked?

all 3 down lock switches open

in a piper seminole, what stops the pump running after gear is up and locked?

pressure limit switch

a priority valve gives priority too?

flight controls

automatic “retraction” gear up, is done by

no such thing

Cross bracing wires used to rig floats?

parallel to aircraft

manual emergency release systems are provided to?

to extend the gear

over cantering of gear systems provide advantage to keep the gear ____?

in locked position without hydraulics

what position is the oleo strut when fluid is at the top of upper chamber?

fully compressed

what does it mean when A/C marshalled is moving their arms up and down at their side?

slow down

during automatic extension, what happens with the diaphragm?

diaphragm moves free fall valve to open, gear falls

Composites test 2

Zachary Halycz · 54問 · 2年前

Composites test 2