Podcast
Questions and Answers
What is the most common cause of spongy brakes?
What is the most common cause of spongy brakes?
- External leakage
- Worn brake pads
- Internal leakage
- Air in the system (correct)
What type of damage can over-inflated tires cause?
What type of damage can over-inflated tires cause?
- Brake drum damage
- Wheel hub damage
- Wheel flange damage (correct)
- No damage, over-inflation is not an issue
What is the primary function of a brake debooster valve?
What is the primary function of a brake debooster valve?
- To prevent brake fade during prolonged braking
- To decrease the pressure and slowly release the brakes
- To apply brake pressure slowly and release the brakes quickly (correct)
- To increase the pressure and apply the brakes rapidly
How should tubeless tires be stored?
How should tubeless tires be stored?
On a wheel bogie unit, what is considered positive camber?
On a wheel bogie unit, what is considered positive camber?
What is the typical cause of a brake fluid leak?
What is the typical cause of a brake fluid leak?
What is the purpose of fuse plugs in aircraft tires?
What is the purpose of fuse plugs in aircraft tires?
What is the purpose of a breaker strip in an aircraft tire?
What is the purpose of a breaker strip in an aircraft tire?
If fluid leaks along with air while oleo charging, what is the likely cause?
If fluid leaks along with air while oleo charging, what is the likely cause?
What does a red dot or triangle mark on an aircraft tire indicate?
What does a red dot or triangle mark on an aircraft tire indicate?
What is the cause when the main landing gear extends, then begins to retract again after selection?
What is the cause when the main landing gear extends, then begins to retract again after selection?
When fitting a tire, where should the red dot be positioned?
When fitting a tire, where should the red dot be positioned?
Compared to normal brake units, composite brake units have which of the following characteristics?
Compared to normal brake units, composite brake units have which of the following characteristics?
What is the purpose of a restrictor valve in an undercarriage system?
What is the purpose of a restrictor valve in an undercarriage system?
What could be the fault if an undercarriage tends to creep back up after being lowered?
What could be the fault if an undercarriage tends to creep back up after being lowered?
Where are vent holes found on aircraft tires?
Where are vent holes found on aircraft tires?
Which of these is the correct method of nose wheel steering in a modern aircraft?
Which of these is the correct method of nose wheel steering in a modern aircraft?
What is the purpose of the fusible plugs installed in some aircraft wheels?
What is the purpose of the fusible plugs installed in some aircraft wheels?
What does excessive wear in the shoulder area of an aircraft tire indicate?
What does excessive wear in the shoulder area of an aircraft tire indicate?
To what level can ribbed tires with marker tie bars be worn?
To what level can ribbed tires with marker tie bars be worn?
Why are bogie type undercarriages used on large aircraft?
Why are bogie type undercarriages used on large aircraft?
What is used to position the bogie beam at a suitable angle for retraction and landing on large aircraft?
What is used to position the bogie beam at a suitable angle for retraction and landing on large aircraft?
What type of gas mixture is used to inflate the braked wheel assemblies on large aircraft?
What type of gas mixture is used to inflate the braked wheel assemblies on large aircraft?
What is the purpose of brake deboosters?
What is the purpose of brake deboosters?
Where is a modulator fitted in an aircraft braking system?
Where is a modulator fitted in an aircraft braking system?
In the case of pressurized aircraft, what is the status of the nose-wheel bay?
In the case of pressurized aircraft, what is the status of the nose-wheel bay?
What is the purpose of the flutter plate in a shock absorber?
What is the purpose of the flutter plate in a shock absorber?
How should made-up wheels be stored?
How should made-up wheels be stored?
What does a green/grey dot marking on an aircraft tire casing represent?
What does a green/grey dot marking on an aircraft tire casing represent?
What is the function of the oil in a shock absorber?
What is the function of the oil in a shock absorber?
How much oxygen is allowed in a tyre as a maximum?
How much oxygen is allowed in a tyre as a maximum?
What does the number 32 represent in a tire specification like '32 x 10.75-14'?
What does the number 32 represent in a tire specification like '32 x 10.75-14'?
What would cause fluid to come out of the air valve when an oleo leg is depressurized?
What would cause fluid to come out of the air valve when an oleo leg is depressurized?
What is the correct procedure when ice is noticed in the valve stem while inflating a tire?
What is the correct procedure when ice is noticed in the valve stem while inflating a tire?
What is the purpose of water dispersing treads on aircraft tires?
What is the purpose of water dispersing treads on aircraft tires?
When installing a new tire on a wheel hub, where should the red spot on the tire be aligned?
When installing a new tire on a wheel hub, where should the red spot on the tire be aligned?
What is the purpose of torque links on a single oleo leg with a stub axle landing gear?
What is the purpose of torque links on a single oleo leg with a stub axle landing gear?
What does a red or yellow line on an inner tube indicate?
What does a red or yellow line on an inner tube indicate?
How is brake wear checked on a multi-brake unit with automatic adjusters?
How is brake wear checked on a multi-brake unit with automatic adjusters?
What is the primary function of an anti-skid device in an aircraft?
What is the primary function of an anti-skid device in an aircraft?
Why is a hydraulic damper fitted to a nose wheel steering system?
Why is a hydraulic damper fitted to a nose wheel steering system?
What factor determines the type of oil used in an undercarriage leg?
What factor determines the type of oil used in an undercarriage leg?
In an anti-skid system, what action is taken to achieve efficient braking?
In an anti-skid system, what action is taken to achieve efficient braking?
If an undercarriage oleo has insufficient deflection, what is the likely cause?
If an undercarriage oleo has insufficient deflection, what is the likely cause?
What is the function of a Maxaret in an aircraft system?
What is the function of a Maxaret in an aircraft system?
Why does the pilot receive an audible warning during descent for landing?
Why does the pilot receive an audible warning during descent for landing?
Where is the restrictor positioned in the landing gear hydraulic retraction and lowering system?
Where is the restrictor positioned in the landing gear hydraulic retraction and lowering system?
What is the purpose of using wheel speed information in an auto speed brake system?
What is the purpose of using wheel speed information in an auto speed brake system?
What is the purpose of a fusible plug fitted to an aircraft wheel?
What is the purpose of a fusible plug fitted to an aircraft wheel?
Study Notes
Braking Systems
- Spongy brakes are usually a result of air in the system.
- A brake debooster valve is provided for applying brake pressure slowly and releasing the brakes quickly.
- Anti-skid devices can reduce aquaplaning.
- In an anti-skid system, brakes are modulated to give the most efficient braking.
Undercarriage Systems
- Over inflated tyres may cause damage to the wheel flange.
- Tubeless tyres are stored vertically.
- On a wheel bogie unit, positive camber is when the bottom of the wheels are closer together.
- A restrictor valve can be used to reduce the speed of the undercarriage extension.
- A fusible plug fitted to an aircraft wheel prevents tyre bursts due to high temperatures created by excessive braking.
Tyres
- A breaker strip in an aircraft tyre is to provide strength.
- A red dot/triangle mark on aircraft tyres means the light part of the tyre.
- Fuse plugs in aircraft tyres are for overpressure protection.
- Vents holes are found on both tubed and tubeless tyres.
- Tyre creep could be caused by under pressure.
- Excessive wear in the shoulder area of an aircraft tyre is an indication of under-inflation.
Landing Gear
- On large aircraft, bogie type undercarriages are used to spread the weight over a large area.
- A hop damper is used to position the bogie beam at a suitable angle for retraction and landing.
- The minimum aquaplaning ground speed is 8.6 times the root square of the tyre pressure in psi.
Miscellaneous
- Brake pads should be replaced if they are worn out due to a badly corroded and pitted brake disk.
- The type of fluid in an oleo strut will depend upon the heat generated in operation of the system.
- A restrictor valve may be used to slow down undercarriage extension.
- The function of the oil in a shock absorber is to damp the rebound.
- The purpose of the flutter plate in a shock absorber is to permit free flow of oil during compression and restriction of oil during extension.
- Made up wheels should be stored vertically at 20/30 PSI charge.
- When checking for alignment of a MLG, check symmetry, tracking, and camber.
- A green/grey dot marking on aircraft tyre casing represents breather points.
- When inflating a tyre and you notice ice in the valve stem, wait for the ice to melt before carrying on with inflation.
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Description
Test your knowledge on aircraft maintenance with questions related to spongy brakes, over inflated tires, and brake deboost. Find out the correct answers with explanations from Jeppesen A&P Technician Airframe Textbook.
