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Page 2-4 GMA 240 Installation Manual
Rev. A 190-00917-01
Figure 2-1. Access Hole Location (Top View)
2.3.3 Hardwire Configuration Option
The following configuration options are available by externally wiring pins to aircraft chassis. When
change of operation is desired during flight, these can optionally be wired to chassis through a suitable
switch mounted in reach of the operator. See Section 4.4.1 for connector and pin details for
implementing these configuration options.
MASQ™ INHIBIT: The Master Avionics SQuelch inhibit configuration option allows selected avionics
audio inputs (COM, NAV, AUX) and alerts to be heard even if they do not exceed the MASQ threshold.
This increases background noise during otherwise quiet operation because noise from these inputs is not
squelched. This option is most useful as a troubleshooting tool.
CREW ISO: This input configures the audio panel for crew intercom isolation in place of pilot isolation.
When the PILOT ISO key is selected, the pilot and copilot will hear each other but will be isolated from
the passengers. When the CREW ISO configuration is selected, the copilot’s headphone jack must be
wired in parallel with the pilot headset output. Microphones are wired as normal.
PILOT ISO MUSIC: This input configures music to be heard by the pilot during PILOT ISO mode (or
by the pilot and copilot if crew isolate mode is configured). Normally, the isolated ICS positions do not
hear music.