Installation and Operation
Post Installation Check
DV16401.03 Issue 04 May 2021 BD406/PBD406 71
2.8 Post Installation Check
After the device/system is installed completely do a test. Make sure that the compliance with the
authority required procedures is obeyed.
The description that follows gives guidance for such tests.
Mechanical Installation and Wiring Check
• Make sure that all cables are attached and the shields are connected to ground.
• Examine the movement of controls to make sure that there is no interference.
• Make sure that all screws are tight and the connectors of the device are secured.
Power Supply
• Examine the power supply lines and the correct polarity.
• Make sure that the power supply is in the specified limits, with and without an engine that
is in operation.
Activated Subsystems
• Examine all subsystems which were activated during installation setup: e.g. audio
systems, transmission interfaces, etc.
Receiver Operation
• Make sure the proper reception of the COSPAS/SARSAT signal.
• It is recommended to use dedicated BT406 test setup for test signals in full permitted
range. For minimal test use a PLB set in self-test mode (refer to the manual of the related
PLB).
It is mandatory to follow all regulations regarding generation of
RF COSPAS/SARSAT distress signals.
If a PLB is used as a source of a test signal, it is not permitted to activate it
in live emergency mode.
• Each emergency call instantly triggers a search and rescue operation.
• Misuse is strenuously prosecuted and can incur claims for damages.
• Unauthorized persons may not operate the PLB.
Antenna Check
Refer to antenna manual.
Interference Check
• Examine the device/system while the engine is in operation and power-on all other
avionics/ electrical systems on the aircraft, to make sure that no significant interference
exists.
• Examine that the device does not cause significant interference with other systems.
• Do a check for interference between the VHF-COM and the GPS receiver used by BD406.
• Is the reception be influenced by local interference, trace the source by systematically
power-off the electronic equipment, generators, etc. on the aircraft to find which
component is causing interference. Then suppress interference accordingly.
• Typical sources of interference are: generators, regulators, static inverters, choppers,
DC converters, RF sources: transponders, DME, communication equipment.
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