Garmin Software Version 0857.09 Instruction Manual download pdf (Page 47)

G1000 System Maintenance Manual - Hawker Beechcraft G58 Page 4-5

190-01180-02 Revision 3

When making any repairs to GTS coax cables installed under this STC, be sure to adhere to all

of the specifications and limitations such as minimum and maximum cable attenuation,

attenuation balance between cables, phase matching etc. in the Installation Manuals

referenced in Table 1.1

4.3.3 ELECTRICAL BONDING TEST

The following bonding tests are provided for GTS 820 equipped G58 aircraft as a requirement

beyond what is given in the aircraft maintenance manual.

NOTE

It is recommended that these tests be conducted after visual

inspections of each zone to minimize access requirements

4.3.3.1 Requirements

All GTS equipment must be installed. Gain access for the procedure listed below as

required and in accordance with the Baron G58 Maintenance Manual.

4.3.3.2 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.

4.3.3.3 Electrical Bonding Procedure

Test Preparation:

All electrical connectors including coaxial cable connectors must be disconnected during

bonding checks.

1. Connect the positive lead of the power supply to a nearby exposed portion of aircraft

metallic structure, such as a frame, as close as possible to the unit under test. Do not

use the units own installation rack. 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

ground point (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.)

Cabin Compartment

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Garmin Software Version 0857.09 Instruction Manual Page 47