Garmin G5 Electronic Flight Instrument Part 23 AML STC Maintenance Manual 190-01112-11
Rev. 7
Page 11 of 54
4.3 Electrical Bonding Test
LRU electrical bonding must be checked every 2,000 flight hours or 10 years, whichever occurs first.
4.3.1 Requirements
• Disconnect any cables and connectors normally attached to the LRU.
• Resistance must be measured from a bare metal portion of the LRU (chassis or connector) to an
airframe grounding location.
• The airframe grounding location should be as close to the LRU as possible, unless otherwise
noted in Table 4-2.
4.3.2 Test Equipment
Calibrated 4 wire Milliohm meter and Kelvin probes are required for this test.
4.3.3 Electrical Bonding Test Procedures.
• Using a calibrated milliohm meter and Kelvin probes measure the resistance of each LRU
between the locations noted in
•
• Table 4-2, and record the result of each installed LRU. Some equipment on the list are optional
and may not be installed.
• Ensure the resistance does not exceed 10 milliohms except for the GTP that shall be less than 2.5
milliohms.
• If the measured resistance is greater 10 milliohms, bonding must be improved to meet applicable
requirements for a new installation in accordance with Section 4 of Garmin G5 Electronic Flight
Instrument Part 23 AML STC Installation Manual (190-01112-10).
Table 4-2 – Electrical Bonding Procedure
Probe and adjacent local metal structure for metal
and tube and fabric aircraft.
For composite aircraft no bonding requirement
Notes:
(1) This is the ground stud to which the LRU bonding strap is connected
(2) For remote LRUs bonded to the back of the instrument panel via an installed aluminum foil ground plane,
the bonding measurement must be taken between the remote LRU and the instrument panel.
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