A320 ESPM Electrical Standard Practices Manual 4(68)

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 _________4. Procedure (Ref. Fig. 002)
 _______CAUTION : DO NOT CAUSE DAMAGE TO CONNECTOR CONTACTS WHEN YOU DO CONTINUITY CHECKS. DAMAGED CONTACTS CAN BECOME LOOSE AND CAN THUS INTERMITTENTLY PREVENT CORRECT CONTINUITY.
 _______CAUTION : BE CAREFUL NOT TO CAUSE DAMAGE TO THE WIRE INSULATION. IF THERE IS DAMAGE TO THE INSULATION, MOISTURE CAN GO INTO THE WIRE AND CAUSE CORROSION AND SUBSEQUENT FAILURE OF THE WIRE.
 A. Test for short circuit of an Aircraft Wire Disconnect the aircraft wire at the two ends.
 (1) Test between the wire and structure 
R R  (a) Connect one of the ohmmeter probes to one end of the aircraft wire. 
R  (b) Connect the second ohmmeter probe to a grounding point.
R  (c) Make sure that the current does not flow from the conductor to the structure (the indication on the ohmmeter does not change).
 (2) Test between two wires: 
R  (a) Connect one of the ohmmeter probes to the wire to be tested. 
R  (b) Connect the second ommeter probe to other wire of the connector.
R  (c) Make sure that the current does not flow through the conductors (the indication on the ohmmeter does not change).
 (d) Repeat this procedure as far as necessary to ensure there is no defect.
 ____NOTE : Shielding of shielded or coaxial cables must be tested as single wires.

 

R Check for Short Circuit Figure 002

20-52-22 Page 4

 _______________________________________________
REFLECTOMETRY TESTS - DESCRIPTION AND OPERATION
 ______________________
1. Job Set-Up Information
 ------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 ------------------------------------------------------------------
No Specific Reflectometer
 __________
2.
 Job Set-Up Before you start the test, prepare the reflectometer (refer to the      manufacturer s instructions).

 _________

3.
 Procedure

 A. Reflectometer test of a coaxial cable
 (1)
 Disconnect the coaxial cable at one end.

 (2)
 Connect the coaxial cable to the reflectometer.

 (3)
 Make sure that the reflectometer shows a correct value
 (usually 50 ohms (+ / - 3 ohms)).

 

 ____
NOTE : Further details on impedance values are given in the Standard Manual.

20-52-23 Page 120-52-24 Page 120-52-24 Page 2

 ___________________________________________INSULATION TEST - DESCRIPTION AND OPERATION
 __________________1. Reason for the Job
R R R R R  _______WARNING : BE CAREFUL WHEN YOU USE ELECTRIC TOOLS IN AREAS WHERE THERE ARE RISKS OF EXPLOSION (FUEL TANKS, FUEL VAPOUR AREAS, ETC.). REFER TO YOUR LOCAL REGULATIONS AND MAKE SURE THAT YOU OBEY THEM. SOME ELECTRIC TOOLS SUCH AS HEAT GUNS, SOLDERING IRONS AND TOOLS WITHOUT INTRINSIC PROTECTION ARE NOT PERMITTED IN THESE AREAS. 
R
R R R  _______CAUTION : ONLY DO THIS TEST FOR THE ELECTRICAL ITEMS SPECIFIED IN THIS PROCEDURE. YOU CAN CAUSE DAMAGE IF YOU DO THIS PROCEDURE FOR OTHER ITEMS. 
R
 To do an insulation test of: - AC generator feeders, - PMG cables of AC generators and excitation cables, - Battery feeders, - Transformer rectifier feeders, - APU starter wires. - Fuel pump supply cables.
 ______________________2. Job Set-Up Information
 A. Fixture, Tools, Test, and Support Equipment
 -------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------No Specific Megohmmeter 500V: 1Kohms to 2000Mohms
 ____NOTE : We recommend that you use an EURELAP type MA205 Megohmmeter, or equivalent. Refer to the manufacturers instructions before you do the test.
 __________3. Job Set-Up
 A. Preparation - Connect the aircraft structure to the ground, - Disconnect the lightning protection unit (LPU), - Disconnect the wire, cable or feeder at each end.

 

 _________4. Procedure
R R R  _______CAUTION : DO NOT CAUSE DAMAGE TO CONNECTOR CONTACTS WHEN YOU DO CONTINUITY CHECKS. DAMAGED CONTACTS CAN BECOME LOOSE AND CAN THUS INTERMITTENTLY PREVENT CORRECT CONTINUITY. 
R
R R R R  _______CAUTION : MAKE SURE THAT THE WIRE IS DISCONNECTED AT EACH END BEFORE YOU DO THIS TEST. IF THE WIRE IS NOT DISCONNECTED, THE VOLTAGE USED FOR THIS TEST CAN CAUSE DAMAGE TO EQUIPMENT. 
R
R R R  _______CAUTION : BE CAREFUL NOT TO CAUSE DAMAGE TO THE WIRE INSULATION. IF THERE IS DAMAGE TO THE INSULATION, MOISTURE CAN GO INTO THE WIRE AND CAUSE CORROSION AND SUBSEQUENT FAILURE OF THE WIRE. 
　
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