BENDIXKing KSN 8 Series - Electrical Load Analysis; GPS Signal Acquisition; VHF COM Checkout

89000046-014 KSN 780/8XX/900 AeroNav AML STC Installation Manual for Helicopters
Rev 0 Page 7-43
© Honeywell International Inc. Do not copy without express permission of Honeywell.
Since a full featured AeroNav XXX is within 5% of the weight of the removed GNS530/430 (less than 1
pound difference), no new weight and balance must actually be performed according to AC 43.13-1B
Change 1 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
AeroNav XXX 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
Note: This section is not applicable for AeroNav 880/780.
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.
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
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 acceptable.