Garmin Software Version 0321.23 Manual Pagina 42

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Page 2-16 G1000 System Maintenance Manual – Diamond DA40/40F
Revision G 190-00545-01
2.7 Lightning Strike Protection
The following modifications to the aircraft provide additional protection of G1000 equipment from the
effects of lightning strike.
2.7.1 Alternator / Battery Voltage Suppressors & Fuses
Refer to 005-00304-00, Sheet 5:
Two Transient Voltage Suppressors (TVS) are installed behind the instrument panel near the circuit
breakers. Voltage suppressors help protect the avionics/electrical equipment against the effects of lighting
strike. One voltage suppressor is connected to the load side of the aircraft battery circuit breaker, and the
other is connected to the line side of the alternator circuit breaker. One 3.2 Amp slow-blow fuse is wired
in line with each voltage suppressor. Fuses are easily removed by twisting the fuse holder cap counter-
clockwise and removing the fuse.
2.7.2 GIA / AHRS Lightning Protection
Refer to 005-00304-00, Sheets 8, 10 & 11:
The GRS 77 and both GIA 63s are uniquely protected from the effects of lightning. A 0.499 resistor, a
transient voltage suppressor, and a 3.2 Amp slow-blow fuse are used for each GIA and the AHRS. These
components are installed on a field-fabricated aluminum block, which is mounted to the front of the
remote avionics enclosure. Power leads for the AHRS and both GIAs are routed from the aircraft harness
to a 9-pin connector (P900), whose mating connector is mounted to the fabricated block (J900). Power is
returned to the LRU after passing through the resistor and voltage suppressor.
Refer to 005-00400-12:
For WAAS-equipped aircraft, seven additional resistors are installed on a sheetmetal bracket on the side
of the remote avionics box. Three resistors are inline between the #1 GIA 63W and GRS 77 RS-232
serial communications line and four are inline between the #1 GIA 63W and PFD High Speed Data Bus
(HSDB) cable.
2.7.3 Lightning Strike Maintenance
Proper electrical bonding of all metallic components is critical for the protection against the effects of
lighting. Severe corrosion may inhibit a component’s ability to bond to the aircraft’s electrical ground
plane. The following summarizes maintenance practices which are implemented to maintain adequate
lightning protection for the aircraft. See Section 4, Table 4-1 for exact maintenance requirements and
associated intervals:
Annual visual inspection of all G1000 equipment, including voltage suppressors, resistors, fuses,
etc.
An electrical bonding check of G1000 equipment every 1000 hours or anytime a lightning strike
occurs or is suspected.
Regular replacement (every 24 calendar months) of all five 3.2 Amp slow-blow fuses ensures
they are in fresh condition.
Replacement of voltage suppressors, resistors, and fuses anytime a lightning strike occurs or is
suspected.
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