Electrical Load Analysis; Gps Signal Acquisition; Vhf Com Checkout - Avidyne IFD540 Installation Manual

Acceptable Methods, Techniques, and Practices Aircraft Inspection and Repair (Chapter 10)
and AC 120-27E Aircraft Weight and Balance Control.

7.6.5 Electrical Load Analysis

Verify the aircraft's electrical load is within limits, reference Section 4.10.

7.6.6 GPS Signal Acquisition

After installation, position the aircraft outside with clear unobstructed view of the sky. Verify
the IFD5XX acquires and calculates a GPS position. Verify no interference from other aircraft
equipment is observed (e.g. TCAS, SATCOM, etc)

7.6.7 VHF COM Checkout

7.6.7.1 VHF COM Interference
After installation, the VHF Communication should be tested. In 1 MHz increments between
118-136.000 MHz, transmit for 35 seconds on each frequency. Verify, no interference between
VHF Comm and other aircraft systems.
Evaluate the GPS system on the following frequencies. The GPS system should not
experience complete signal loss on when transmitting on the VHF Comm.
7.6.7.2 VHF Antenna Checkout
Verify the VSWR is less than 2:1 through the entire frequency band. This can be verified
using an aviation navigation test set (e.g. IFR 4000 or similar test equipment). VSWR higher
than 2:1 will have reduced VHF Communication performance. If >2:1 VSWR, verify in-flight
performance is unacceptable.
600-00299-000
25 kHz channels
121.150
121.175
121.200
131.250
131.275
131.300
8.33 kHz channels
121.185
121.190
130.285
131.290
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IFD5XX Installation Manual
Revision: 02