6. Materials & hardware - Q&A

How would you test a hydraulic hose?

• Pressure test 2.0 * working pressure.
• Pressure test 1.5 * working pressure.
• Pressure test 1.0 * working pressure.

A journal load is

• compression.
• radial.
• axial.

Avdel rivets are closed by

• a tapered mandrel.
• broaching.
• squeezing.

What is the small hole on a swaged turnbuckle for?

• To check for moisture deposits.
• To check if correct amount of cable has been inserted before swaging.
• To alloy the turnbuckle to be wire locked.

Capped nuts are used

• prevent overtightening due to the threaded portion being restricted by the cap.
• to provide a dry torque joint.
• to stop leaks.

An aluminium alloy bolt may be identified by

• its colour (dyed black).
• the letter A stamped on the head.
• its colour (dyed green).

Which of the following are acceptable to use in cleaning anodized surfaces?

• Steel wool, aluminium wool, fibre bristle brush.
• Aluminium wool, fibre bristle brush.
• Brass wire brush, stainless steel wire brush.

Copper is an inferior conductor to aluminium when comparing

• weight for weight.
• CSA with CSA.
• load for load.

Where heat is likely to be transmitted through a bearing

• group 2 bearings are used.
• group 4 bearings are used.
• group 3 bearings are used.

Spilled mercury on aluminium

• increases susceptibility to hydrogen embrittlement
• may cause impaired corrosion resistance if left in prolonged contact.
• causes rapid and severe corrosion in prolonged contact.

Heavy corrosion deposits on clad aluminium alloys should be removed

• mechanically using a pneumatic vibrator.
• chemically by use of trichloroethylene.
• chemically by use of phosphoric acid.

Maximum repair dimensions for use of microballoons is

• 10mm.
• 20mm.
• 30mm.

If the fabric on a wood/fabric aircraft has lost its strength

• the fabric can be treated with a rejuvenator
• the fabric can be treated with additional coats of the approved type of dope.
• the fabric must be replaced.

During a Rockwell Hardness test, what dimension is measured?

• The diameter of the indent.
• The depth of the indent.
• The diameter and depth of the indent.

How is the material of the end hook of a helical spring loaded in service?

• In bending.
• In tension.
• In torsion.

Which of the following factors must be taken into account when determining the wire size to use for an aircraft installation?

• Allowable power loss, permissible voltage drop, current carrying capability of the conductor, type of load (continuous or intermittent).
• Mechanical strength, allowable power loss, the colour coding of the wire insulation, permissible voltage drop.
• Allowable power loss, the routing clamp spacing along the harness, current carrying capability of the conductor, type of load (continuous or intermittent).

Surface corrosion on stainless steel is identified by

• red rust.
• white film.
• black pitting.

The lifting or flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion is

• exfoliation.
• electrolysis.
• transgranulation.

The material specifications for a certain aircraft require that a replacement oil line be fabricated from3/4 inch, 0.072 5052-0 aluminium alloy tubing. What is the inside dimension of this tubing?

• 0.688 inch.
• 0.606 inch.
• 0.750 inch.

Capped nuts are used so

• to prevent leaks from pipe ends.
• the part is not over torqued as the bolt touches the captive part first.
• to ensure that it is dry bolted.

Cable stops are manufactured from

• stainless steel.
• copper.
• magnesium alloy.

The main reason why crimped joints are preferable to soldered joints is

• the quality of crimped joints will be constant.
• no flux is needed.
• there is no heat required.

The colour code on sheet metal indicates

• only the specification of the material.
• the spec and gauge of the material.
• that the material is from an approved source.

Fabric rejuvenator

• penetrates the fabric and restores fungicidal resistance.
• restores fabric strength and tautness to at least the minimum acceptable level.
• restores the condition of the dope coatings.

Fibreglass laminate damage not exceeding the first layer or ply can be repaired by

• filling with putty consisting of compatible resin and clean, short glass fibres.
• sanding the damaged are until aerodynamically smooth.
• trimming the rough adges and sealing with paint.