Garmin SA01456Wi_D Manual Page 99

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G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 4-15
190-00682-01 Revision F
IMPORTANT!
For installed equipment not listed in this maintenance manual, use the inspection
procedures set forth in Chapter 05 of the King Air Model 90 Series Maintenance
Manual, or other appropriate maintenance manual, as the requirements set forth by
those manuals are still applicable. The requirements set forth by this document
take precedence over those set forth by the King Air Model 90 Series Maintenance
Manual, or other appropriate maintenance manual, in cases where the requirements
conflict.
4.5 Electrical Bonding Test
The following bonding test is provided for G1000-equipped C90A/C90GT/C90GTi King Air aircraft as a
requirement beyond what is given in the aircraft maintenance manual. The electrical bonding checks are
split into two tests, Phase 3 Electrical Bonding Test and Phase 4 Electrical bonding test. This places the
bonding test requirement for each G1000 LRU in the same phase as the visual inspection of that zone to
minimize access requirements.
4.5.1 Requirements
All G1000 equipment must be installed. Gain access for the procedure listed below in Section 4.5.3 as
required and in accordance with the King Air Model 90 Series Maintenance Manual. It is recommended
that these tests are conducted after visual inspection of the zone to minimize access requirements.
4.5.2 Test Equipment
A milli-ohm meter and Kelvin probes are recommended for this test. However, a standard voltmeter,
power supply with adjustable current limit, and ammeter may be substituted. The following procedure is
written using the voltmeter, power supply and ammeter. All test equipment must have valid calibration
records.
4.5.3 Phase 3 Electrical Bonding Procedure
1. Connect the positive lead of the power supply to the engine compartment grounding bracket (battery
negative connection to the airframe). Connect/touch the positive lead of the voltmeter to the same
point.
NOTE
Ensure that the voltmeter and power supply probes do not touch, so as not to induce
contact resistance.
2. Touch negative lead of power supply to each of the test points listed while performing Step 3. At
each point, configure the power supply to produce 1 amp before measuring voltage. (Use an ammeter
to ensure current is within 1 amp ±100 milli-amp at each point).
3. Set the voltmeter to measure milli-volts and null the reading. Measure the voltage from the engine
grounding bracket (step 1) to each of the following points and record the voltage. (Perform Step 2 at
each point to ensure that 1 amp ±100 milli-amp is present before measuring)
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