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R  the surface electrical resistance of an external composite panel, 
R  only if there is no non-conductive finish paint on the antistatic 
R  paint. 
R  4. Procedure_________ 
R  Subtask 20-28-00-869-089 
R  A. Measurement of the Surface Electrical Resistance 
R  (1) Equipment 
R  (a) For fairings (but not antenna fairings and radome): 
R  - Ohmmeter 50 Kohms - 500 Volts - 1 mA (max.), with 2 
R  rounded-point prods, diameter 4 mm (0.1574 in.). 
R  (b) For antenna fairings and radome: 
R  - Megohmmeter 100 Megohms - 500 Volts - 1 mA (max.), with 2 
R  rounded-point prods, diameter 4 mm (0.1574 in.). 
R  (c) Probe per DIN65181 
R  NOTE : You can use 2 rounded-point prods, diameter 4 mm (0.1574____ 
R  in.) as an alternative to the DIN 65181 probe. 
R  (2) Connect the probe to the ohmmeter/megohmmeter. 
R  (3) Apply the prod on the surface covered with the antistatic paint. 
R  - the distance between the edge of the surface and the probe must be 
R  at least 50 mm (1.9685 in.) (Typical 100 mm (3.9370 in.)). 
R  NOTE : The pressure applied on the probe must be sufficient to____ 
R  prevent the oscillations of the ohmmeter/megohmmeter display. 
R  (4) Measure the square resistance value. 
R  NOTE : For probes that have electrodes 100 mm (3.9370 in.) apart, you____ 
R  must multiply the measured value by 0.5 to get the Square 
R  Resistance value. 
R  (5) Make sure that the measured values are not higher than the maximum 
R  permitted values. (Ref. TASK 20-28-00-869-002) 
R  NOTE : Do the steps (2) to (5) again several times at different areas____ 
R  of the surface. 
R

 

R (Ref. Fig. 502/TASK 20-28-00-991-037)

R  (6) Remove the test equipment. 
R  5. Close-up________ 
R  Subtask 20-28-00-942-114 
R  A. Close Access 
R  (1) Make sure that the work area is clean and clear of tool(s) and other 
R  items.

 

R  Measurement Points on Different Panels Figure 502/TASK 20-28-00-991-037
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 TASK 20-28-00-720-012

R  Check of the Aircraft Electrical Grounding
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
R  No specific No specific  metal plate Megohmmeter - 10 Megohms - 500 Volts - 1 mA (max.)
 B. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
20-28-00-869-002  Table of the Maximum Permitted Resistance Values
 3. Job Set-up__________
 Subtask 20-28-00-420-091 
R  A. Equipment 
R R  (1) Megohmmeter - 10 Megohms - 500 Volts - 1 mA (max.), with the related leads and prods. 
R R (2) A metal plate. 

 4. Procedure
_________

 Subtask 20-28-00-210-064
 A. Measurement of the Resistance Value
 (1)
 Put the metal plate between the tires of the nose landing gear and the ground.

 (2)
 Measure the resistance between the plate and the nose gear leg with the megohmmeter.

 NOTE : This procedure is easier if you make the tire/plate contact
____
 moist.

 (3)
 Make sure that the measured values are not higher than the maximum permitted values (Ref. TASK 20-28-00-869-002).

 (4)
 Remove the test equipment.

 5. Close-up
________ Subtask 20-28-00-942-101
 A. Close Access
 (1) Make sure that the work area is clean and clear of tool(s) and other items.
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 TASK 20-28-00-720-014

R  Loop Impedance Test
 1. Reason for the Job__________________
 Self Explanatory
 2. Job Set-up Information______________________
 A. Fixtures, Tools, Test and Support Equipment
　
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