Vhf Comm Operational Check; Marker Beacon Test; Vhf Com Interference Test; Figure 3-4. Marker Beacon Symbology - Garmin G1000 Checkout Procedure

3.6

VHF COMM Operational Check

Perform a ramp test radio check by exercising the installed transceivers, boom mic, hand mic,
microphone key and audio over the headphones and speaker. Verify that communications are clear and
PTT operation is correct for each pilot position.
1. Select the audio source corresponding to each installed avionics unit (i.e. NAV1, NAV2, COM1,
COM2, ADF and DME) and check for audio over the headsets.
2. Press the SPKR key and verify that the selected audio is heard over the speaker.
3.6.1
Failsafe Operation Check
1. Open AUDIO No 1 CB.
2. Check the failsafe operation by exercising the COM 1 boom mic, hand mic, microphone key and
audio over the headphones. All volume control for the COM audio should be through the PFD1
and PFD2 volume control. Verify proper operation of COM 1 using the failsafe operation.
3. Close AUDIO No 1 CB.
3.7

Marker Beacon Test

Using a ramp tester, simulate the outer marker, middle marker and inner marker signals by following the
test equipment manufacturer's instructions. Verify that each marker audio signal is present over the pilot
and co-pilot headphones and cockpit speaker.
Verify that the outer, middle, and inner annunciations appear on PFD1 and PFD2 when the corresponding
signal is applied. Marker beacon annunciations appear at the upper left corner of the altitude indicator on
the PFD (Figure 3-4). Operate the MKR MUTE key on GMA1 and GMA2 and ensure that the audio
signal is muted.
3.8

VHF COM Interference Test

This test must be conducted outside. Use of a GPS repeater inside a hangar may result in a failed test.
This procedure assumes that the system is currently set to 25 kHz COM channel spacing. Once the
signal acquisition test from Section 3.4 has been completed successfully, perform the following steps:
1. On the MFD, monitor GPS1 signal strength bars on the 4th AUX page.
2. On PFD1 and PFD2, ensure that the CDI is set to GPS. If it is not, press the 'CDI' softkey until
GPS ENR is displayed.
3. Verify that the GPS "INTEG" flag is out of view.
4. Select 121.150 MHz on the No. 1 COM transceiver.
5. Transmit for a period of 35 seconds while monitoring GPS 1 signal strength levels.
6. During the transmit period, verify that the GPS "INTEG" flag does not come into view on either
PFD and verify that GPS1 does not lose a 3-D navigation solution on the MFD.
G1000/GFC 700 Post Installation Checkout Procedure – Hawker / Beechcraft King Air C90
190-00682-00

Figure 3-4. Marker Beacon Symbology

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