TM 1-1520-240-MTF4-51(1) 1 Time — Volume of the audio warningmessage decreases by one-half.(2) 2 Times — Audio warning message isdisabled and no longer heard inheadsets.j. Check dimming control for proper operationfrom DIM to BRT.(1) Check digital display dims and goes out.(2) Check LO caution lights dim but do notgo out.X. NAVIGATION and COMMUNICATION CHECK.1-47.1. UHF.a. Transmit and receive.b. Preset and manual tune.c. Check both a high and low frequency, e.g.,over 300 MHz and under 300 MHz.2. VHF-AM/FM.a. Transmit and receive.b. Check both AM and FM bands at high,medium, and low frequencies.c. FM Homing.(1) MODE SEL — DF.(2) HSI MODE SELECT panel —FM SEL,check FM SEL lit.(3) Course deviation bar on HSI — Checkresponse in turns.(4) TO-FROM arrows concealed on HSI.(5) GS and NAV OFF flags concealed onHSI.
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