Electrical Bonding Test; Table 4-9, Lightning Strike Inspection Procedure - Garmin G1000 Nxi System Maintenance Manual

Item
Inspect the GSD 41 unit (if installed), shelf, brackets and connectors for corrosion or other
GSD 41 (FDR option
defects. Check the integrity of the shield block ground attachments to the harness
only)
connector assembly as well as the integrity of the individual shields and their attachment.

Table 4-9, Lightning Strike Inspection Procedure

Item
A post lightning strike inspection must be done for a suspected or actual lightning strike to
antennas or the OAT probes. Inspect antenna/probe and surrounding installation to ensure
GTP 59 OAT Probe that there is no structural damage around the areas where lightning may have attached. If
or Antenna there is visible sign of damage to the probe or antenna, then it should be replaced per
Section 6. Refer to the Beechcraft Structural Inspection and Repair Manual listed in Table
1-1 for any aircraft structural repairs.
A "Magnetometer Interference Test" per Section 5.17.4 and "GSU 75B, GRS 77, or GRS
7800 and GMU 44 Magnetic Calibration" per Section 7.10.3 must be performed after a
GMU 44 (Qty 2) suspected or actual lightning strike. A lightning strike can result in a change in the
magnetic properties of steel components in the area of the magnetometers which can
cause unacceptable magnetic interference levels.
Verify the GIA cooling fan discrete out is correctly activating when the fan is not working by
GIA Fans
performing tests per Section 9.4.

Electrical Bonding Test

The following bonding tests are provided for G1000-equipped King Air 300 Series 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.
Requirements
All G1000 equipment must be installed. Gain access for the procedure listed below in Section
4.5.3 and 4.5.4 as required and in accordance with the aircraft maintenance manual. It is
recommended that these tests are conducted after visual inspection of the zone to minimize
access requirements.
Test Equipment
A milliohm meter and Kelvin probes are recommended for this test. However, an alternate
method may be used to provide equivalent results by using the following procedure and a
standard voltmeter, power supply with adjustable current limit, and ammeter. The test set up for
this alternate method is described below.
All test equipment used for the bond checks must be calibrated.
1. Connect the positive lead of the power supply to airframe ground. Connect/touch the
positive lead of the voltmeter to the same point.
Ensure that the voltmeter and power supply probes do not touch, so as not to
induce contact resistance.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Description/Procedure
Description/Procedure
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