7. Maintenance practices - Q&A

The data gives a turning torque for the bearings alone, read before the lip seal is fitted. Preload is instead adjusted with the seal in place until that figure is reached. What preload results?

• More than the specified preload
• Less than the specified preload
• The specified preload exactly

What is the minimum bend radius of a loom adequately supported at a terminal block?

• 10 * diameter
• 8 * diameter
• 3 * diameter

The picture shows a torque wrench with an extension. To apply a torque of 350 lb.in. the reading on the dial should be

• 245 lb.in.
• 280 lb.in.
• 350 lb.in.

What is the allowable reaction on a rivet?

• 2D
• 1D
• 1.5D

The UK standard of limits and fits is

• BS4500.
• BS8888.
• BS308.

When using a D.T.I. to check the run-out of a shaft, readings of -15 to +25 would indicate a run-out of

• 0.025 inches.
• 0.020 inches.
• 0.040 inches.

If there is a positive allowance between the smallest possible hole and the largest possible shaft, the fit is known as

• a transition fit.
• a clearance fit.
• an interference fit.

An ammeter movement reads 0 - 1mA FSD and has a coil resistance of 52.2 ohms. What would you be required to do to enable it to read 10mA FSD?

• Place a 5.8 ohm resistor as a shunt in parallel with the meter.
• Place a 52.2 ohm resistor as a shunt in parallel with the meter.
• Place a 9 ohm resistor as a multiplier in series with the meter.

A Dial Test Indicator may be used for

• checking a round bar for bow.
• checking dimensions to within 0.125 inch.
• checking any known depth measurement.

What non-destructive testing method requires little or no part preparation, is used to detect surface or near-surface defects in most metals, and may also be used to separate metals or alloys and their heat-treat conditions?

• Eddy current inspection.
• Magnetic particle inspection.
• Ultrasonic pulse inspection.

When tapping blind holes

• a set of three taps is used.
• a set of two taps is used.
• a single bottoming tap is used.

A crimped electrical connection is suspected to be high resistance. How would you verify this without disconnecting the circuit?

• Measure the millivolt drop across the connection with a millivolt meter.
• Check the resistance across the connection using an ohmmeter.
• Apply a 250 volt megger test across the crimped terminal.

Galvanic corrosion refers to a type of

• corrosion between two pieces of material.
• electrochemical plating process between metal layers.
• uniform surface corrosion across the exposed area.

When drilling out a rivet, use a drill

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

To check the structure of a wing

• ultrasound NDT methods are used.
• high voltage X-rays are used.
• low voltage X-rays are used instead.

When leak testing with a colour contrast field kit, the soak time for a component less than 1/8 in. (3mm) thick would be

• at least twice the normal required soak time.
• at least 3 times the normal soak time.
• at least the standard normal soak time.

To replace one 1/8 inch rivet

• three 1/16 inch rivets would be required.
• two 1/16 inch rivets would be required.
• four 1/16 inch rivets would be required.

If the operator varies the content of the maintenance schedule, what action must be taken?

• Amend the Maintenance Schedule first and then seek CAA approval.
• Await CAA approval before amending the Maintenance Schedule.
• Amend the Maintenance Schedule without further approval.

Springs are manufactured from

• high carbon alloy steel with high strength requirements.
• low carbon alloy steel with high strength requirements.
• high carbon alloy steel with low strength requirements.

What does the cut of a file refer to?

• Arrangement of the teeth.
• Number of teeth per inch.
• Grade of material used.

If the outer cover of a flexible hose is found to be cracked.

• It is unserviceable due to possible flow restriction.
• It may still be serviceable.
• It is unserviceable since it may leak.

The specified minimum size for a secondary earth (bonding) conductor of single-wire construction is

• not less than 0.5mm.
• not less than 18 gauge.
• 22 AWG.

Following a major defect the C of A

• is not affected, however may run out on a time basis.
• will be invalidated and requires a full renewal survey before flight.
• Nothing will happen and the C of A remains fully valid.

Once a person has been disconnected from the source of an electrical shock the next step should be

• seek medical assistance from qualified personnel immediately.
• check for breathing start AR if necessary.
• check for a pulse and start cardiac massage if necessary.

On a pre flight check you notice an instrument glass is cracked. You should

• record it in the tech log.
• check MEL.
• inform the flight crew.