
G1000 System Maintenance Manual – Diamond DA40/40F Page 4-11
190-00545-01 Revision G
4.5 Electrical Bonding Test
The airframe bonding test is described in the DA40 AMM in Section 51-80-00 on Page 201. The
following bonding test is provided for G1000-equipped DA 40 aircraft as a requirement beyond what is
given in Section 51-80-00.
4.5.1 Requirements
All G1000 equipment must be installed. Remove the instrument panel cover, baggage compartment floor,
and baggage compartment to gain access to required areas. Remove the co-pilot seat to gain access to the
OAT probe base, following instructions in the DA 40 AMM.
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 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):
a) Top metal case of PFD: __________ milli-volts
b) Top metal case of MFD: __________ milli-volts
c) Top metal case of GMA 1347: __________ milli-volts
d) GEA 71 Body: __________ milli-volts
e) GDC 74A Body: __________ milli-volts
f) OAT Probe Base Nut (inside fuselage): __________ milli-volts
g) GIA 1 Top: __________ milli-volts
h) GIA 2 Top: __________ milli-volts
i) GTX 33 Top: __________ milli-volts
j) GRS 77 metal base: __________ milli-volts
k) Resistor Bracket Top (WAAS only): __________ milli-volts
l) GMU 44 metal base: __________ milli-volts
m) GDL69 Top: __________ milli-volts
n) GDL59 Top: __________ milli-volts
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