(2) External metal surfaces/parts (hinged or fixed) (Ref. TASK 20-28-00-720-005), (Ref. TASK 20-28-00-720-008)
(a) The values given are for measurement between the adjacent primary metal structure and a metal part of the points that follow:
-------------------------------------------------------------------------------| POINT LOCATION | TASK | MAX. PERMITTED | | | REFERENCE | RESISTANCE VALUE| --------------------------------------|----------------------------------------R | - cabin doors and | 20-28-00-720-005 | 10 milliohms * | R | access doors/panels | | | | | | | | - tanks access doors | 20-28-00-720-005 | 10 milliohms * | | | | | | - retractable lights and wing tip | 20-28-00-720-005 | 10 milliohms * | | lights | | | | | | | | - vent holes and drain masts | 20-28-00-720-005 | 10 milliohms * | | | | | | - external linkages | 20-28-00-720-005 | 10 milliohms * | | | | | | - engine air intakes | 20-28-00-720-005 | 10 milliohms * | | | | | | - nacelle doors and panels | 20-28-00-720-005 | 10 milliohms * | | | | | | - engine and APU drains | 20-28-00-720-005 | 10 milliohms * | | | | | | - miscellaneous fixed metal parts | 20-28-00-720-005 | 10 milliohms * | | | | * 100 milliohms for stainless steel or titanium material | | | | - metal plate on wing and engine | 20-28-00-720-005 | 50 milliohms | | scan lights | | | | | | | | - potable water panels and cargo | 20-28-00-720-005 | 200 milliohms | | service panels | | | | | | | | - cargo doors | 20-28-00-720-005 | 50 milliohms | | | | | | - trailing edge of control surfaces | 20-28-00-720-005 | 10 milliohms | | (elevators, rudder, flaps and | | | | ailerons) | | | | | | | | - landing gear legs | 20-28-00-720-005 | 100 milliohms | | | | | | - spoiler, flap, aileron and slat | 20-28-00-720-005 | 10 milliohms | | mobile hinges | | | | | | | | - entrance stair (if installed) | 20-28-00-720-005 | 500 milliohms | | | | | | - flaps and slats (on tracks) from | 20-28-00-720-005 | 50 milliohms |
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| POINT LOCATION | TASK | MAX. PERMITTED | | | REFERENCE | RESISTANCE VALUE| --------------------------------------|----------------------------------------| attachment point | | | | | | - end (fuselage side) of each radome| 20-28-00-720-005 | 2 milliohms | | lightning arrestor strip | | | | | | |
R | - vertical stabilizer tip lightning | 20-28-00-720-005 | 10 milliohms |
R | conductor along the top of the tip| | |
R | (between the lightning conductor | | |
R | and the THS bonding leads) | | |
R | | | | | - pitot probes, angle of attack | 20-28-00-720-005 | 5 milliohms | | sensors and temperature probes | | | | | | | | - ice detector probes | 20-28-00-720-005 | 10 milliohms | | | | | | - radio and navigation antennas | 20-28-00-720-005 | 5 milliohms | | | | | | - HF coupler (make sure that the | 20-28-00-720-005 | 20 milliohms | | connectors are disconnected) | | | | | | | | - lightning arrestor strips at the | 20-28-00-720-005 | 50 milliohms | | periphery of the landing gear | | | | doors | | | | | | | | - landing gear doors (metal) | 20-28-00-720-005 | 50 milliohms | | | | | | - landing gear uplock | 20-28-00-720-005 | 500 milliohms | | | | | | - landing gear door actuators | 20-28-00-720-005 | 50 milliohms | | | | | | - servocontrols | 20-28-00-720-005 | 50 milliohms | | | | | | - pylon rear structure | 20-28-00-720-005 | 50 milliohms | | | | | | - fixed part of fan cowl attachment | 20-28-00-720-005 | 50 milliohms | | (cowl closed) | | | | | | | | - fan cowl hinges | 20-28-00-720-005 | 100 milliohms | | | | | | - carbon struts: | | | | . strut/clamp junction | 20-28-00-720-008 | 20 Kohms | | . clamp/structure junction | 20-28-00-720-005 | 10 milliohms | -------------------------------------------------------------------------------
R (3) Fluid systems
R (Ref. TASK 20-28-00-720-006)
R (a) The values given are for measurement between the adjacent primary
R metal structure and a metal part of the points that follow:
R -------------------------------------------------------------------------------
R | POINT LOCATION | TASK | MAX. PERMITTED |
R | | REFERENCE | RESISTANCE VALUE|
R --------------------------------------|----------------------------------------
R | Fuel system and systems in fuel | | |
R | vapor zones | | |
R | | | |
R | - electrical components (inside or | 20-28-00-720-006 | 10 milliohms |
R | outside fuel tanks) | | |
R | | | |
R | - non-electrical components outside | 20-28-00-720-006 | 50 milliohms |
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