(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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