Subsection 17 - 7.4 Avionic test equipment

Question 1

A capacitive fuel contents system should be tested with?

Answer 1

A wheatstone bridge

Question 2

A fuel calibration test set when used to check an aircraft with half a fuel load is connected to the guage with?

Answer 2

Fuel level in series

Question 3

A fuel quantity test set has an?

Answer 3

Externally adjustable resistor

Question 4

A pressure guage is fitted to a dead weight tester, the piston area 0.25 sq.in and total mass of the mass carrier and masses is 5LB. If the pressur guage is accurate what pressure in PSI will it read?

Answer 4

20 PSI

Question 5

Befor using a bonding tester, the 6ft lead has the two prongs shorted together with a piece of metal, what would the indicator read?

Answer 5

Full scale right

Question 6

Before using a dead weight tester you would?

Answer 6

Pressurise the tester to the required pressure

Question 7

Bonding lead testers are attached with a 60ft lead connected to the main earth and a 6ft test lead is connected to?

Answer 7

Check the resistance between selected points

Question 8

Circuit tests on aircraft should be carried out in the following order?

Answer 8

Bonding, continuity, insulation, functional

Question 9

Continuity of a fibreoptic cable is tested with a ?

Answer 9

Calibrated light generator and opto-power meter

Question 10

During an insulation test, the result will be dependant on?

Answer 10

The ambient conditions during the test

Question 11

Electronic test equipment for fuel tank contents systems usually incorperate?

Answer 11

Variable resistors

Question 12

For an ATC ident, how do you confirm the pulse generation?

Answer 12

Use a ramp test set

Question 13

How do you prime a dead weight tester?

Answer 13

Wind handle fully in and pour fluid in the reservoir

Question 14

How should a dead weight tester be used?

Answer 14

The outlet should not be connected to the instrument until the required weights are raised by the platform

Question 15

How would you test a mach switch in-situ?

Answer 15

Use BITE

Question 16

If an insulation resistance tester is operated and the leads are suspended in free air, what will the meter read?

Answer 16

Infinity

Question 17

If the two prongs of a bonding tester are shorted and the single prong lead is in free space, what will be the reading on the scale?

Answer 17

Full scale

Question 18

On a bonding tester the number of probes on the 60ft and 6ft leads are respectively are?

Answer 18

1 and 2

Question 19

On a static leak tester, pressure is released by?

Answer 19

A bleed valve in the tester

Question 20

Primary structure bonding should be no more than?

Answer 20

50 milliohms

Question 21

The damping force in a meter prevents?

Answer 21

Oscillation of the pointer

Question 22

The length of the lead with the two prongs on the bonding tester is?

Answer 22

6ft

Question 23

The maximum resistance between isolated conducting parts which maybe subjected to appreciable electrostatic charging and the main earth system should be?

Answer 23

0.5 megaohms or 100,000 ohms per square metre or foot

Question 24

The tong tester should only be used on?

Answer 24

Single cables

Question 25

The maximum value of bonding of a secondary structure is?

Answer 25

1 ohm

Question 26

What code should be set on the transponder when the aircraft is in an emergency condition?

Answer 26

7700

Question 27

What is the primary purpose of bonding aircraft components?

Answer 27

To ensure all components are of the same electrical potential

Question 28

What is the problem with using a megger on a piece of equipment containing capacitors?

Answer 28

Fluctuating readings will occur while the capacitors charge up

Question 29

When carrying out a serviceability check on a bonding tester, short together the three prongs of both probes and ensure which of the following?

Answer 29

A zero reading

Question 30

When carrying out an insulation check, readings will vary due to the?

Answer 30

Humidity the test was carried out under

Question 31

When connecting or disconnecting an electrical appliance the wall socket must?

Answer 31

Be off

Question 32

When insulation testing a circuit with suppressors what should you do?

Answer 32

Disconnect the suppressors as they will obscure the readings

Question 33

When testing a circuit with suppressors with a megger you should disconnect the supressors because charging/ discharging of capacitors causes?

Answer 33

Fluctuating readings

Question 34

When testing a fuel metering unit, how is it checked?

Answer 34

With a meter in series with the unit

Question 35

When testing an aircraft fuel contents indication system with fuel tanks partly filled?

Answer 35

The test set replaces the aircraft system

Question 36

When testing an anodised component with an insulation tester ensure?

Answer 36

Probes penetrate the anodised layer

Question 37

When testing thermocouples using a test set the ambient temperature?

Answer 37

Is considered every time

Question 38

When turning the handle on a megger with the probes kept apart the needle deflects?

Answer 38

To infinity

Question 39

When using a bonding tester, ensure the prongs?

Answer 39

Penetrate the anodised layer

Question 40

When using a digital meter to test a diode, a correct operation of the diode is indicated by?

Answer 40

A voltage drop of 0.3v to 0.7v

Question 41

When using a ILS/VOR ramp test set, what is the tone delete button for?

Answer 41

To test invalid flag

Question 42

When using transistorised test equipment, what should the output be?

Answer 42

Low impedance

Question 43

For the captains side, what are the two possible locations for the EHSI?

Answer 43

Below or to the right of the EADI