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R  |  - Galley structure, racks (two  |  |  | 
R  |  structural points on front)  | 20-28-00-720-005  |  50 milliohms  | 
R  |  - Electrical equipment  | 20-28-00-720-005  |  50 milliohms  | 
R  |  - Electrical equipment supports  | 20-28-00-720-005  |  50 milliohms  | 
R  |  - Tap  | 20-28-00-720-005  | 500 milliohms  | 
R  |  - Washbasin  | 20-28-00-720-005  | 500 milliohms  | 
R  |  |  |  | 
R  | - Electrical equipment not  |  |  | 
R  |  installed on rack and  |  |  | 
R  |  electrically bonded with  |  |  | 
R  |  fasteners  | 20-28-00-720-005  |  10 milliohms  |
 -------------------------------------------------------------------------------
(8) Aircraft grounding
 (Ref. TASK 20-28-00-720-012)
 (a) The value given is for measurement between the metal plate below
 the wheel tires and the metal part that follows:
 -------------------------------------------------------------------------------
|  POINT LOCATION  |  TASK  | MAX. PERMITTED  |
 |  |  REFERENCE  | RESISTANCE VALUE|
 --------------------------------------|----------------------------------------
| - landing gear leg  | 20-28-00-720-012  |  10 Megohms  |
 -------------------------------------------------------------------------------

 

 (9) External composite panels (Ref. TASK 20-28-00-720-010) or (Ref. TASK 20-28-00-720-010)
 (a) The values given are for measurement between the adjacent primary metal structure and the parts that follow:
 -------------------------------------------------------------------------------| POINT LOCATION | TASK | MAX. PERMITTED | | | REFERENCE | RESISTANCE VALUE| --------------------------------------|----------------------------------------| - fairings (carbon composite or with| 20-28-00-720-010 | 100 Kohms | | antistatic coating) but not | | | | antenna fairings and radome | | | | | | | | - antenna fairings and radome | 20-28-00-720-010 | 200 Megohms | -------------------------------------------------------------------------------
(10) Surface resistance of antistatic paint on external composite panels (Ref. TASK 20-28-00-720-011) or (Ref. TASK 20-28-00-720-011) or (Ref. TASK 20-28-00-720-011)
 -------------------------------------------------------------------------------| POINT LOCATION | TASK | MAX. PERMITTED | | | REFERENCE | RESISTANCE VALUE| --------------------------------------|----------------------------------------| - fairings (but not antenna fairings| 20-28-00-720-011 | 50 Kohms | | and radome) | |square resistance| | | | | | - antenna fairings and radome | 20-28-00-720-011 | between | | | |5 and 100 Megohms| | | |square resistance| -------------------------------------------------------------------------------
(11) Main grounding points and current return (Ref. TASK 20-28-00-720-005)
 (a) Main groundind points
 1_ The values given are for measurement between the adjacent
 metal structure of the grounding point and the upper end of
 the grounding lead of the equipment items that follow:

 1EFF : ALL 1 20-28-00Page 511 1 1 Feb 01/03R 1 1 1CES 1

 -------------------------------------------------------------------------------| POINT LOCATION | TASK | MAX. PERMITTED | | | REFERENCE | RESISTANCE VALUE| --------------------------------------|----------------------------------------| - main batteries | 20-28-00-720-005 | 0.05 milliohms | | | | | | - transformer/rectifiers | 20-28-00-720-005 | 0.05 milliohms | | | | | | - AC generators | 20-28-00-720-005 | 0.05 milliohms | | | | | | - ground power receptacle | 20-28-00-720-005 | 0.05 milliohms | | | | | | - APU generator | 20-28-00-720-005 | 0.05 milliohms | | | | | | - static inverter | 20-28-00-720-005 | 0.05 milliohms | | | | | | - emergency generator | 20-28-00-720-005 | 0.05 milliohms | -------------------------------------------------------------------------------
(b) Secondary grounding points
 (Ref. TASK 20-28-00-720-005)

 1 The values given are for measurement between the adjacent
_ metal structure of the grounding point and the upper end of the grounding lead:
 -------------------------------------------------------------------------------| POINT LOCATION | TASK | MAX. PERMITTED | | | REFERENCE | RESISTANCE VALUE| --------------------------------------|----------------------------------------| For cables with a gauge of not more | | | | than 22: | | | | | | | | - with a test current of 10 amperes:| | | | . steel, stainless steel and | 20-28-00-720-005 | 1 milliohm | | titanium material | | | | . other materials | 20-28-00-720-005 | 0.1 milliohms | | | | | | For cables with a gauge of more | | | | than 22: | | | | | | | | - with a test current of 1 ampere: | | | | . steel, stainless steel and | 20-28-00-720-005 | 1 milliohm | | titanium material | | | | . other materials | 20-28-00-720-005 | 0.1 milliohms | -------------------------------------------------------------------------------
　
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