Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
32 Cards in this Set
- Front
- Back
|
What are the disadvantages of single wheel nose and main gear types?
|
1. Do not spread weight over large patch area.
2. Do not provide protection against blow outs. 3. More prone to hydroplaning 4. Increase chance of slamdown |
|
|
What advantages do dual wheel types have over single wheel types?
|
Greater patch area
Safer in respect of wheel blowouts |
|
|
What is the purpose of trailing link main gear?
|
Absorbs landing loads well, making landing seem softer
|
|
|
What are the advantages of tilted design?
|
1. Better storage of gear so more room for fuel, bleed air ducting etc
2. Less chance of slamdown 3. Less chance of hydroplaning |
|
|
What are the main purposes of body gear steering?
|
1. Reduce amount of bending stress on wingspar
2. Assists in turning the aircraft in confined spaces 3. Greater braking ability |
|
|
What the the disadvantages of body gear steering?
|
Increased cost and complexity
Increased weight Increased rolling friction |
|
|
Why is body gear steering locked out above a certain speed?
|
Interferes with high speed taxi, take off and landing.
|
|
|
How does the body gear steering work in comparison to nose gear steering?
|
Swivels in opposite direction and turning angle is less
|
|
|
Compare ribbed tires to block pattern tires.
|
Ribbed tire is more directionally stable and has less rolling resistance.
Block pattern tire is very good at pumping water off runway. |
|
|
What is the purpose of chined tires?
To what aircraft are they fitted? |
Reduce water spraying out from tire and into engine intakes. Fitted to aircraft with rear fuselage engines.
|
|
|
What prevents the gear doors snagging the landing gear?
|
A sequencing valve
|
|
|
What will selecting the landing gear selector to OFF position achieve?
|
Depressurised the landing gear hydraulic system, leaving mechanical uplock to hold gear in place.
|
|
|
What type of aircraft have a tailskid?
How is it operated? |
Long fuselage aircraft
Operated by landing gear lever. |
|
|
Does failure of anti-skid braking limit take-off weight?
|
Yes
|
|
|
What two strategies are used to limit cavitation in a hydraulic system?
|
Pressurising the reservoir
Providing baffles in the reservoir |
|
|
Which braking effects are used in certification testing of braking ability?
|
Only wheel brakes and aerodynamic braking.
No reverse thrust. |
|
|
Where are thermal plugs located?
|
In the wheel hub.
|
|
|
How long can thermal plugs take to reach their peak temperature?
|
35 minutes
|
|
|
60 minutes after landing, how much energy created during landing will remain in the brakes?
|
50%
|
|
|
What is the formula for dynamic hydroplaning speed of a spinning wheel?
|
9 x SQRT (tire pressure)
|
|
|
What is the formula for dynamic hydroplaning speed of a stationary wheel?
|
7.7 x SQRT (tire pressure)
|
|
|
What is the purpose of a safety valve in nose-wheel steering?
|
Centres the nose wheel in event of total hydraulic system failure.
|
|
|
When is cornering force greatest?
|
When not used in association with brakes.
|
|
|
What happens to brake temperatures during taxi?
|
Increase.
|
|
|
What are the worst runway characteristics for hydroplaning?
|
Smooth, flat with poor drainage, rubber deposits and painted surface markings.
|
|
|
What are the best runway characteristics to prevent hydroplaning?
|
Porous, grooved and a marked crest toward centreline.
|
|
|
What sort of landing should you make on a runway with significant water?
|
Firm.
|
|
|
How much of the braking action do spoilers and reverse thrust contribute on a slippery runway?
|
70%
|
|
|
When is viscous hydroplaning most likely?
|
Smooth runways with as little as 0.25mm of water.
|
|
|
At what speeds is viscous hydroplaning most likely?
|
Can persist down to taxi speed.
|
|
|
What is reverted rubber hydroplaning?
|
Wheel becomes locked up and tire rubber reverts back to original latex state. Molten rubber fills treads.
|
|
|
What type of hydroplaning is most likely to be associated with steam?
|
Reverted rubber hydroplaning.
|
