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Questions and Answers

What is the purpose of indication systems in some aircraft installations?

To monitor the condition of fastener holes

To prevent corrosion along seams of doors and panels

To provide an alternative to positive locking mechanisms

To ensure correct closure of panels and doors (correct)

Why is it particularly important to inspect panels and doors regularly?

To maintain the aesthetic appearance of the aircraft

To prevent corrosion along seams

To prevent loss of panels in flight, which can cause engine destruction (correct)

To prevent damage from excessive use

What is a common issue with panels and doors?

Dissimilar metal corrosion in fastener holes

Frame damage from excessive use

Corrosion along seams

All of the above (correct)

What is the purpose of protective covers on some switches?

To prevent inadvertent operation Signup and view all the answers

What indicates that a protective cover has been lifted on a fire extinguisher switch?

A broken copper wire Signup and view all the answers

Why should corrosion along seams of doors and panels be investigated?

To determine the extent of the corrosion Signup and view all the answers

What type of tools may be required for inspecting certain doors and panels?

Specialist tools specific to the aircraft type Signup and view all the answers

What is a common issue with fastener holes on panels and doors?

Dissimilar metal corrosion Signup and view all the answers

What should be ensured when inspecting aircraft fittings like nuts and bolts?

They have the correct torque and tamper proof paste is intact Signup and view all the answers

What should be identified and recorded during the inspection of rivets?

Any corrosion discovered around rivets Signup and view all the answers

What should be checked during the inspection of filters, screens, and aircraft fluids?

For cleanliness and contamination Signup and view all the answers

Why should rivets be drilled out during an inspection?

To determine the extent of any corrosion Signup and view all the answers

What should be ensured during the inspection of aircraft wiring?

There is no evidence of wires or wire looms chafing or rubbing against other components or structures Signup and view all the answers

What should be inspected during the inspection of the powerplant?

Engine mounts for any signs of movement or wear, cracking or corrosion Signup and view all the answers

What should be checked during the inspection of aircraft fittings like nuts and bolts?

If they are installed correctly and are the correct size and type Signup and view all the answers

What is required for reinstalling rivets?

Following the maintenance manual Signup and view all the answers

What is a precaution to avoid when working in a mercury-contaminated area?

Touching surfaces suspected of being contaminated Signup and view all the answers

Why should drill bits used on mercury-contaminated areas be discarded?

They are contaminated with mercury Signup and view all the answers

What should be done with protective clothing used in contaminated areas?

Dispose of them in unused metal containers Signup and view all the answers

Why should you wash your hands thoroughly after contacting mercury?

To prevent the spread of mercury Signup and view all the answers

What should you do with vacuum cleaners used in the clean-up process?

Thoroughly clean them with steam or hot water and soap Signup and view all the answers

Why is it important to avoid eating, smoking, or blowing your nose without washing your hands?

To prevent the ingestion of mercury Signup and view all the answers

What should be done with shoes that may have come into contact with mercury?

Wash them with soap and water Signup and view all the answers

Why should stagnant air be avoided when working with mercury?

It can lead to mercury vaporization Signup and view all the answers

What is the primary indication of a pneumatic system's serviceability?

Correct pressure at the start and end of the flight Signup and view all the answers

What is the likely cause of a slow pressure drop in the storage system between flights?

Slow leak in the storage system Signup and view all the answers

What is the purpose of using leak-detecting fluids?

To detect slow leaks in the storage system Signup and view all the answers

What is the primary method of checking landing gear oleo shock struts for correct inflation?

Measuring their extension Signup and view all the answers

What is creep in the context of tyres?

Movement of the tyre around the rim due to heavy braking Signup and view all the answers

What is the consequence of creep on a tyre fitted with a tube?

Rapid loss of pressure Signup and view all the answers

What determines the serviceability of a tyre?

Depth of the groove in the tyre tread Signup and view all the answers

What is the purpose of re-treading a tyre?

To extend the life of a tyre Signup and view all the answers

What is the recommended consistency of a paint remover for aircraft surfaces?

Syrupy Signup and view all the answers

How should a water-rinseable paint remover be applied to the surface?

By dabbing with a brush Signup and view all the answers

What is the purpose of allowing the paint remover to stand on the surface for a period of time?

To break the bond between the paint finish and the metal Signup and view all the answers

What is the effect of dissolved salts on the corrosion of aluminium surfaces?

It accelerates the corrosion process Signup and view all the answers

What is the characteristic of intergranular attack on aluminium alloys?

It occurs at the grain boundaries of the alloy Signup and view all the answers

What is the first step in treating corrosion on aluminium surfaces?

Removing corrosion products mechanically or chemically Signup and view all the answers

Why is it important to mask vulnerable areas when using paint removers?

To prevent damage to composite resins and plastics Signup and view all the answers

What is the result of penetrating pit-type corrosion on aluminium tubing?

The tubing becomes weaker Signup and view all the answers

Study Notes

Pneumatic Systems

Pneumatic systems require the same pressure at the start and end of a flight.
Low pressure at the end of a flight may indicate a leak in the ducting or pipes.
Pressure loss between flights may indicate a slow leak in the storage system.

Visual Inspection Techniques

Landing Gear

Oleo shock struts can be checked for correct inflation by measuring their extension.
Dimensions can indicate serviceability.

Inspecting Tyres

Tyre serviceability is indicated by the depth of the groove in the tread.
Defects that can affect tyres include cuts, blisters, creep, and low pressure.
Creep is the movement of the tyre around the rim due to heavy braking action.

Inspecting Panels and Doors

Panels and doors can be damaged by excessive use.
Frames can become damaged where items are passed through them.
Check for corrosion along seams of doors and panels.

Inspecting Emergency Systems / Equipment

Protective covers may be used to prevent inadvertent operation of a switch.
A broken wire or frangible device may indicate system operation.

Inspecting Bolts

Check torque and tamper-proof paste on aircraft fittings like nuts and bolts.
Identify any elongation, deformation, or corrosion on bearing surfaces.

Inspecting Rivets

Check for corrosion around rivets and identify any gaps or looseness.
Drilling out rivets may be necessary to determine corrosion extent.

Inspecting Filters, Screens and Fluids

Check for cleanliness and contamination of filters, screens, and fluids.
Ensure correct installation and replacement according to the maintenance manual.

Inspecting the Powerplant

Inspect engine mounts for security and any evidence of movement or wear.

Corrosion on Metals and Alloys

Aluminium and Aluminium Alloys

Corrosion attack on aluminium surfaces is evident through etching, pitting, or roughness.
Three forms of attack are particularly serious: penetrating pit-type corrosion, stress corrosion cracking, and intergranular attack.

Treatment of Corrosion

Mechanically or chemically remove corrosion products and inhibit residual materials.
Restore permanent surface coatings to prevent corrosion damage and embrittlement.

Mercury Spill Precautions

Avoid contact with contaminated surfaces.
Wear protective clothing, gloves, and wing socks to avoid scratching metal surfaces.
Clean and dispose of contaminated materials properly.
Wash hands and exposed skin thoroughly after contacting mercury.

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