Aircraft Maintenance Review

Questions and Answers

What is an indication of excessive wear in the shoulder area of an aircraft tire?

Underinflation

Improper tire balancing

Overinflation

Excessive toe-in (correct)

How long should you wait after a flight before checking tire pressure?

At least 2 hours (3 hours in hot weather) (correct)

At least 5 hours

At least 1 hour

At least 3 hours (4 hours in hot weather)

What is the purpose of a relief system valve in a brake assembly system?

To compensate for the thermal expansion (correct)

To increase brake fluid pressure

To reduce pressure for break application

To prevent the tire from skipping

What is the most probable cause of a dragging left brake on an airplane with no recent brake service work?

Foreign particles stuck in the master cylinder Signup and view all the answers

What will cause parking brakes to continually bleed off pressure?

An internal leak in the master cylinder Signup and view all the answers

What is the purpose of chevron seals in shock struts?

To prevent oil from escaping Signup and view all the answers

What is the purpose of a stripe or mark applied to a wheel rim and tire?

To provide a visual indication of wheel and tire assembly Signup and view all the answers

What is another possible cause of an external leak in the brake line?

Damaged brake line fittings Signup and view all the answers

What is the purpose of bleeding brakes?

To withdraw fluid from the system for the purpose of removing air Signup and view all the answers

What does an embossed letter 'NP' on an air valve core stem indicate?

High-pressure type Signup and view all the answers

What is measured to determine the proper operating position of an oleo shock strut?

The extension of the strut Signup and view all the answers

What type of brake is not adaptable to mechanical operation?

Expander-tube type Signup and view all the answers

What is the primary purpose of a debooster cylinder in a brake system?

To reduce brake pressure and maintain static pressure Signup and view all the answers

How should an empty shock strut be filled with fluid?

Extend and compress the strut completely at least two times Signup and view all the answers

What indicates that an O-ring is intended for use in a hydraulic system using MIL-H5606 fluid?

A white and yellow stripe Signup and view all the answers

If the extended longitudinal axis of the main landing gear wheel assemblies intersects aft of the aircraft, what can be said about the wheels?

They are toe-in Signup and view all the answers

What is a benefit of using stressed skin metal in a wing assembly?

It has higher strength and is more corrosion resistant Signup and view all the answers

When inspecting a stressed skin metal wing assembly known to have been critically loaded, what is true?

If rivets show no visible distortion, further investigation is unnecessary Signup and view all the answers

What occurs when bearing failure has occurred in a rivet?

The rivet shanks will be joggled Signup and view all the answers

How is the stud length of a Dzus turnlock fastener measured?

In sixteenth of an inch Signup and view all the answers

What angle must a piece of flat stock be bent to form a closed angle of 15°?

105° Signup and view all the answers

How does acoustic emission testing detect defects in composite materials?

By picking up the ‘noise’ of any deterioration that may be present Signup and view all the answers

What is one of the best ways to assure that a properly prepared batch of matrix resin has been achieved?

Perform a chemical composition analysis Signup and view all the answers

What can occur if genuine rivet tipping has occurred?

Groups of consecutive rivet heads will be tipped in the same direction Signup and view all the answers

What should be used for the final cleaning of a surface?

MEK (methyl ethyl ketone) Signup and view all the answers

What is the main concern when using rivets in composite structures?

Delamination Signup and view all the answers

What type of loads cause the most rivet failures?

Shear Signup and view all the answers

What is the primary alloying agent of 2024-T3 indicated by?

The number 24 Signup and view all the answers

What should be provided when using rivets or nuts and bolts?

Adequate spacer or other satisfactory means Signup and view all the answers

Aircraft structural units, such as spars, engine supports, etc., can be:

Repairable, using approved methods Signup and view all the answers

What is a benefit of using microballoons when making repairs to laminated honeycomb panels?

All of the above Signup and view all the answers

Why are slotted holes not recommended when using rivets or nuts and bolts?

They can cause excessive tightening Signup and view all the answers

What function does a transmitter in a fuel pressure warning system serve?

Converts fluid pressure to an electrical signal. Signup and view all the answers

What should be used to inert an integral fuel tank before attempting repairs?

Carbon dioxide Signup and view all the answers

How many ways can a typical large transport aircraft's fuel manifold system serve the fuel?

1, 2, and 3 Signup and view all the answers

What is the primary purpose of a fuel tank sump?

Provide a positive system of maintaining minimum fuel supply. Signup and view all the answers

What do fuel baffles installed in tanks primarily help prevent?

Surging caused by aircraft attitude changes. Signup and view all the answers

What does normal fuel crossfeed system operation in multiengine aircraft allow for?

Fuel jettisoning to correct lateral instability. Signup and view all the answers

What is usually the electrical state of all switches before attempting maintenance on fuel systems?

Must be placed in OFF position. Signup and view all the answers

What key feature does a fuel manifold system provide for maintaining fuel conditions?

Reduces contamination and fire hazards during fueling. Signup and view all the answers

Study Notes

Aircraft Landing Gear System

Excessive tire wear in the shoulder area indicates potential overinflation or excessive toe-in issues.
Recommended wait time after a flight before checking tire pressure is at least 3 hours in hot weather.
Parking brakes can bleed off due to internal leaks in the master cylinder or insufficient hydraulic fluid.
Chevron seals in shock struts serve to prevent oil escape and absorb shock effects.
An air valve core stem indicating high-pressure type features an embossed "NP."

Brake System Components

Debooster cylinders in brake systems primarily reduce brake pressure and maintain static pressure.
Bleeding brakes involves withdrawing fluid from the system to remove air.
A stripe or mark on wheel rims indicates service work completion or specifications.

Rivet and Fastener Inspection

Rivets showing no visible distortion after critical load inspections may not require further investigation.
Genuine rivet tipping is evident if consecutive heads tip in the same direction.
Dzus turnlock fasteners consist of a stud, grommet, and receptacle, measured in hundredths of an inch.

Material and Structural Integrity

Aircraft structural units are generally repairable unless subjected to compressive loads.
Shear loads cause the majority of rivet failures while bearing loads and head failures are also significant.
Adhesive bonding in composite structures eliminates the need for hole-filling fasteners like rivets.

Fuel System and Maintenance

Transmitters in fuel pressure warning systems convert fluid pressure to electrical signals.
Baffles in fuel tanks prevent surging and vapor accumulation due to aircraft attitude changes.
To inert an integral fuel tank before repairs, carbon dioxide is typically used.

General Aircraft Maintenance Procedures

A typical large transport aircraft fuel manifold allows servicing from all tanks simultaneously.
Fuel sump systems collect water and dirt for safe operation and to prevent contamination risks.
Normal fuel crossfeed system operations in multi-engine aircraft help maintain balanced fuel loads.

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Description

Review questions on aircraft maintenance, including landing gear systems and brake assembly systems.