4.15 GNC 250/250XL COMM/GPS
De tailed op er a tion is de scribed in the GARMIN GNC-250 Pi lot’s
Guide (Garmin P/N 190-00067-50, Rev. A or later) or GARMIN
GNC-250XL Pi lot’s Guide
(Garmin P/N 190-00067-60, Rev. A or
later), which must be im me di ately avail able to the flight crew. The
GNC 250/250XL dis play top line is the ACTV (ac tive) and STBY
(standby) COMM fre quen cies, and the lower three lines are the
GPS dis play. This GPS is for VFR use only.
This COMM works as soon as the OFF/ON/Vol ume con trol knob
is turned ON; right be side this knob is the SQuelch con trol key...
you can press it for MAX I MUM re ceiver sen si tiv ity. The dou ble
ended ar row key (above the CRSR cur sor key) is used to
trade the ACTV (ac tive) and STBY (standby) fre quen cies. Only
the STBY fre quency may be changed, by the knobs be side the
CRSR key, and only when the CRSR key has been pressed the
cor rect num ber of times to high light the STBY fre quency. Pressing
the dou ble ar row key for more than two sec onds will al ways
tune the ac tive fre quency to 121.50 mhz (emer gency). A “TX”
will show up to the right of the ac tive fre quency, dur ing trans mit.
The GNC 250/250XL will not trans mit con tin u ously for lon ger
than 35 sec onds, even with a stuck mic key.
IF there is a flash ing light be side the MSG key, and / or the in stru -
ment panel mounted “GPS MES SAGE ” light is on, press the GNC
250/250XL MSG (mes sage) key once, to read the mes sage, and
again, to re turn to the pre vi ous dis play. ENTer = “yes” to “OK?”
Press the D ar row “di rect to” key and use the right side knob (and
ring) to spell out a cho sen way point (re mem ber that ICAO says to
start USA all let ter air port iden ti fi ers with “K”); then, press ENT
twice, to nav i gate di rectly there. Use CRSR and ring knob to high -
light what you want to change. ENT will trans fer a high lighted
fre quency to STBY. Press NRST (near est air port, etc.) key and
twist knobs to get quick se lec tions. D ar row and ENT takes you
there. See GNC 250
or GNC 250XL Pi lot’s Guide for more in -
struc tions.
GNC 250 COMM/GPS
SCHWEIZER MODEL 269C-1 HELICOPTER
CSP-C1-1A
32 FAA Approved: 03 Oct 1995
Revised: 09 Jan 1998
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