Subsection 17 - 7.4 Avionic test equipment Flashcards
A capacitive fuel contents system should be tested with?
A wheatstone bridge
A fuel calibration test set when used to check an aircraft with half a fuel load is connected to the guage with?
Fuel level in series
A fuel quantity test set has an?
Externally adjustable resistor
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?
20 PSI
Befor using a bonding tester, the 6ft lead has the two prongs shorted together with a piece of metal, what would the indicator read?
Full scale right
Before using a dead weight tester you would?
Pressurise the tester to the required pressure
Bonding lead testers are attached with a 60ft lead connected to the main earth and a 6ft test lead is connected to?
Check the resistance between selected points
Circuit tests on aircraft should be carried out in the following order?
Bonding, continuity, insulation, functional
Continuity of a fibreoptic cable is tested with a ?
Calibrated light generator and opto-power meter
During an insulation test, the result will be dependant on?
The ambient conditions during the test
Electronic test equipment for fuel tank contents systems usually incorperate?
Variable resistors
For an ATC ident, how do you confirm the pulse generation?
Use a ramp test set
How do you prime a dead weight tester?
Wind handle fully in and pour fluid in the reservoir
How should a dead weight tester be used?
The outlet should not be connected to the instrument until the required weights are raised by the platform
How would you test a mach switch in-situ?
Use BITE
If an insulation resistance tester is operated and the leads are suspended in free air, what will the meter read?
Infinity
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?
Full scale
On a bonding tester the number of probes on the 60ft and 6ft leads are respectively are?
1 and 2
On a static leak tester, pressure is released by?
A bleed valve in the tester
Primary structure bonding should be no more than?
50 milliohms
The damping force in a meter prevents?
Oscillation of the pointer
The length of the lead with the two prongs on the bonding tester is?
6ft
The maximum resistance between isolated conducting parts which maybe subjected to appreciable electrostatic charging and the main earth system should be?
0.5 megaohms or 100,000 ohms per square metre or foot
The tong tester should only be used on?
Single cables
The maximum value of bonding of a secondary structure is?
1 ohm
What code should be set on the transponder when the aircraft is in an emergency condition?
7700
What is the primary purpose of bonding aircraft components?
To ensure all components are of the same electrical potential
What is the problem with using a megger on a piece of equipment containing capacitors?
Fluctuating readings will occur while the capacitors charge up
When carrying out a serviceability check on a bonding tester, short together the three prongs of both probes and ensure which of the following?
A zero reading
When carrying out an insulation check, readings will vary due to the?
Humidity the test was carried out under
When connecting or disconnecting an electrical appliance the wall socket must?
Be off
When insulation testing a circuit with suppressors what should you do?
Disconnect the suppressors as they will obscure the readings
When testing a circuit with suppressors with a megger you should disconnect the supressors because charging/ discharging of capacitors causes?
Fluctuating readings
When testing a fuel metering unit, how is it checked?
With a meter in series with the unit
When testing an aircraft fuel contents indication system with fuel tanks partly filled?
The test set replaces the aircraft system
When testing an anodised component with an insulation tester ensure?
Probes penetrate the anodised layer
When testing thermocouples using a test set the ambient temperature?
Is considered every time
When turning the handle on a megger with the probes kept apart the needle deflects?
To infinity
When using a bonding tester, ensure the prongs?
Penetrate the anodised layer
When using a digital meter to test a diode, a correct operation of the diode is indicated by?
A voltage drop of 0.3v to 0.7v
When using a ILS/VOR ramp test set, what is the tone delete button for?
To test invalid flag
When using transistorised test equipment, what should the output be?
Low impedance
For the captains side, what are the two possible locations for the EHSI?
Below or to the right of the EADI
