Becker AR4201 - Preparation - Transceiver Replacement; Visual Inspection; Functional Test

Technical Instruction
Preparation - Transceiver Replacement
Retrofit-Instructions Issue 01 November 2016 AR6201 9
2. Preparation - Transceiver Replacement
2.1. Visual Inspection
• Inspect the structure of the VHF-COM installation area to be free from any mechanical
defect like cracks or deformation.
In case of any findings involve qualified and authorized personnel for trouble
shooting and repair before performing retrofit-instructions.
• Verify that cable loom, cable connectors and contact pins of the installation are in good
condition.
• Inspect the existing antenna in respect to mechanical damages on the antenna body and
a sound structure of the sealing between the antenna foot and the aircraft skin.
• If possible, perform a VSWR test on the antenna system.
• The aircraft skin should also be inspected for signs of cracks in the close vicinity of the
antenna mounting holes.
• Check the power supply protection (fuse or circuit breaker).
o For the AR6201 a 7.5 A external circuit breaker or fuse shall be installed.
2.2. Functional Test
• With running engine and all electrical systems "ON” a TX and RX communication test with
the tower or any other station within a line of sight between both antennas should be
performed.
o Ascertain that neither of the both signals (RX/TX) is overlaid by any distortion from
generator or ignition system of the aircraft.
In case of any findings involve qualified and authorized personnel for trouble
shooting and repair before performing retrofit-instructions.