7-6 ENSTROM F-28F/280FX RFM SUPPLEMENTReport No. 28-AC-081 Jan 15/19c. Press the OFF key to power off the unit. Switchingthe AVI MASTER switch to OFF will also turn offthe unit.2. Refer to the pilot’s guides listed in paragraph 7-1 foradditional information regarding GTX operation andtroubleshooting as well as information for operation anddisplay via the GTN interface.3. For night operation, the display brightness can beadjusted with the PNL LTS DIMMER (Figure 7-1).Table 7-1. GTX 345 Control Keys and FunctionsKey FunctionONALTVFROFFSBYIDNT ON: Powers on, disables altitude reporting.o Transponder replies to interrogations, asindicated by the Reply Symbol ( ). ALT: Powers on, enables altitude reporting.o Transponder replies to identification andaltitude interrogations, as indicated by theReply Symbol ( ). VFR: Changes to the preprogrammed squawkcode for VFR.o Press the VFR a second time to restore theprevious identification code. OFF: Powers off. SBY: Powers on or changes into standby mode.o Transponder will not reply to anyinterrogations or transmit ADS-B Out.o Receives ADS-B In information, but will not bea TIS-B participant. IDNT: Activates the Ident function for 18seconds.o Word “IDENT” will appear in the upper leftcorner of the display.This electronic document is not linked to a subscription for revision control or distribution. Refer to the OptionalEquipment Supplement Publications Status link under the Technical Support Page of the Enstrom Helicopter websitefor the current revision level of the Rotorcraft Flight Manual Supplement.UNCONTROLLED COPY WHEN DOWNOADED OR PRINTED