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(18) Push the HI-LO-T/M button to the T/M position. All 3 marker lights must come on.
(19) Push the VOL knob to turn the unit OFF.
(20) Do a test transmission on COM 1 from the pilot
station.
(21) Set AVIONIC MASTER switch to OFF.
(22) Set the ALT/BAT switch (Lycoming version) or
ELECTRIC MASTER key switch (TAE version) to
OFF.
(23) Disconnect the head-sets from the head-set
sockets.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-50-00 Page 211
20 Sep 2007
C. GMA 340 Audio Selector and Marker Beacon Receiver Functions
Detail Steps/Work Items Key Items/References
(1) Make sure that all the head-sets are connected.
(2) Set the ALT/BAT switch (Lycoming version) or
ELECTRIC MASTER key switch (TAE version) to
ON.
(3) Set AVIONIC MASTER switch to ON.
(4) Rotate the left small knob past the click to turn
the unit ON.
(5) Push the TEST button. All LED's and lights must come on.
(6) Push the COM 1 MIC button. Make sure that:
S The green LED's in the COM 1
button and the COM 1 MIC button
come on.
S The COM 1 MIC button LED does
not flash.
(7) Do a test transmission on COM 1 from the pilot
station.
Make sure that:
S The PTT button gives proper
transmission on COM 1.
S The COM 1 receiver can be heard.
S The volume and squelch can be
adjusted.
(8) Do a test transmission on COM 1 from the copilot
station.
Make sure that:
S The PTT button gives proper
transmission on COM 1.
S The COM 1 receiver can be heard.
S The volume and squelch can be
adjusted.
AIRCRAFT
Communications DA 40 Series
AMM
Detail Steps/Work Items Key Items/References
Page 212
20 Sep 2007 23-50-00 Doc # 6.02.01
Rev. 5
(9) Push the COM 2 MIC button. Make sure that:
S The green LED's in the COM 2
button and the COM 2 MIC button
come on.
S The COM 2 MIC button LED does
not flash.
(10) Do a test transmission on COM 2 from the pilot
station.
Make sure that:
S The PTT button gives proper
transmission on COM 2.
S The COM 2 receiver can be heard.
S The volume and squelch can be
adjusted.
(11) Do a test transmission on COM 2 from the copilot
station.
Make sure that:
S The PTT button gives proper
transmission on COM 2.
S The COM 2 receiver can be heard.
S The volume and squelch can be
adjusted.
(12) Push the COM 1/2 button. Make sure that:
S The pilot can communicate on COM
1.
S The co-pilot can communicate on
COM 2.
(13) Select each receiver in turn using the selector
buttons.
Make sure that:
S The LED in the button comes on to
show that it is in use.
S Audio from each selected
equipment connects to the headsets.
(14) Push the SPKR button. Make sure that:
S The selected audio sources can be
heard in the cabin speaker.
AIRCRAFT
DA 40 Series
AMM
Communications
Detail Steps/Work Items Key Items/References
Doc # 6.02.01
Rev. 5 23-50-00 Page 213
20 Sep 2007
(15) Push the SENS button. Make sure that:
S The marker beacon intensity LED
changes from HI to LO and from LO
to HI.
(16) Rotate the left small knob fully counterclockwise.
(17) Do a test transmission on COM 1 from the pilot
station.
(18) Set the AVIONIC MASTER switch to OFF.
(19) Set the ALT/BAT switch (Lycoming version) or
ELECTRIC MASTER key switch (TAE version) to
OFF.
(20) Disconnect the head-sets from the head-set
sockets.
AIRCRAFT
Communications DA 40 Series
AMM
Page 214
20 Sep 2007 23-50-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-60-00 Page 1
20 Sep 2007
Section 23-60
Static Discharging
1. General
The static discharging system has two main parts, the electrical bonding system and the surface static
discharging system. Refer to Section 51-80 for the electrical bonding system. Section 51-80 also
describes the resistance measurements for the static discharge wicks.
The build-up of static electricity can affect the quality of radio communications on all COM and NAV
equipment. It can also affect the quality of all NAV indications.
2. Description and Operation
The static discharging system removes the electro-static charge which collects on the airplane
surfaces. The composite structure of the DA 40 does not let electricity flow through it. The airplane
surfaces are covered with a special conductive filler through which the electricity flows to the static
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