7. Maintenance practices - Q&A

To prevent wet arc tracking

• cable grips should be kept tight.
• ensure hot stamp printing is controlled.
• cables should not be excessively stretched.

When drilling out a rivet, use a drill

• larger than the rivet hole.
• same size as the hole.
• smaller than the rivet hole.

A 3 1/2 bit multimeter will indicate readings up-to

• 999.
• 1999.
• 19999.

When checking a torque wrench 15 inches long, the load required to give torque of 120 lbs.in. is

• 6 lbs.
• 8 lbs.
• 10 lbs.

If the aircraft is away from base who may certify the second part of the duplicate inspection?

• a pilot with a current licence for the aircraft type.
• engineer after obtaining approval from maintenance control center.
• any licensed engineer holding type approval.

When manufacturing aircraft control cables, the cable can be cut by

• using a hacksaw with the cable held under tension.
• using an oxy-acetylene cutting torch.
• using a chisel on a flat metal surface.

At which frequency is the calibration of frequently used crimping tools carried out?

• Bi-annually (every two years)
• Annually (once per year)
• Every 1000 crimps

Which of the following NDT methods requires that the surface of the test piece is cleaned down to bare metal?

• Eddy Current.
• Magnetic Particle.
• Dye-penetrant.

Which type crack can be detected by magnetic particle inspection using either circular or longitudinal magnetisation?

• 45degrees.
• longitudinal.
• transverse.

A thread on a drawing is labeled 1/2-20 UNF - 1B. The thread is

• bi-directional.
• external.
• internal.

The sharpest bend that can be placed in a piece of metal without critically weakening the part is called the

• maximum radius of bend.
• minimum radius of bend.
• bend allowance limit.

A Silver coated conductor in an unpresurised area is subject to moisture and has a damaged coating would be likely to cause

• Wet Arc Tracking.
• Silver Migration.
• Red Plague.

Whenever possible a functional test should be carried out on an aircraft using which power supply?

• The aircraft battery.
• The aircraft generators.
• An external supply.

When torque loading, a wrench should be selected where the required value falls

• at the top end of the range.
• in the middle of the range.
• at the bottom end of the range.

A micro-shaver is used to

• cut rivets to the required length before forming.
• mill the rivet head after forming.
• trim the rivet shank diameter before installation.

Avdel rivets are closed by

• a broaching process.
• a tapered mandrel.
• a squeezing process.

How is a D.T.I. initially set up?

• The gauge plunger should be fully extended and then the needle zeroed.
• The gauge plunger should be partly depressed and the needle zeroed.
• The needle should be zeroed first, then the plunger fully extended.

A fire resistant cable is proof tested by exposure to a standard fire for

• 5 minutes.
• 15 minutes.
• 30 minutes.

When an aircraft has been reweighed, what should be done with the superseded Weight and Balance Report?

• Kept in the aircraft technical logbook.
• Destroyed once the new report has been issued.
• Kept in the weight and balance records.

The riveting defect in the figure shown is

• excessive hammering on the rivet head.
• the dolly was held at an angle.
• the snap was not square.

The damping force in a meter

• prevents oscillation of the pointer.
• returns the pointer to zero.
• assists the pointer across the scale.

The length of a hose assembly with elbowed end fittings is taken from

• the maximum length of the straight hose portion.
• the extreme overall length of the assembly.
• the centre of the bore at the nipple extremity.