4.13
AVI ONICS MASTER SWITCH
On air craft equipped with a sig nif i cant amount of ra dio/avi on ics
equip ment, an avi on ics mas ter switch is in stalled. The avi on ics
mas ter switch pro vides a sin gle point source for con nect ing and
dis con nect ing ra dio/avi on ics equip ment (comm’s, nav’s, ADF,
DME, Com pass sys tem, tran spond ers, etc.) from the air craft elec -
tri cal sys tem.
Dur ing en gine start and shut-down, the avi on ics mas ter switch
should be placed in the “OFF” po si tion to pre vent pos si ble volt age
tran sients dam age to ra dio/avi on ics equip ment. The avi on ics mas -
ter switch should be turned on af ter the air craft al ter na tor has been
turned on.
4.14
TRANS MITTER/RE CEIVER AND AU DIO MON I TOR
SE LEC TOR SWITCHES
The trans mit ter/re ceiver se lec tor switch
A
is used to se lect which
com mu ni ca tions sys tem trans mit ter (COMM 1 or COMM 2) is
con nected to the air craft mi cro phones. Switch
A
also si mul ta -
neously con nects the se lected trans mit ter au dio to the air craft
head phones, re gard less of the po si tion of head phones au dio mon i -
tor switches
B, C,
and
D
(If in stalled). Ex am ple: When COMM 1
is se lected by the trans mit se lec tor switch, mi cro phone key ing, mi -
cro phone au dio, and head phones au dio will be con nected to the
COMM 1 com mu ni ca tions sys tem.
Head phones au dio mon i tor se lec tor switches
B
(COMM 1),
C
(COMM 2), and
D
(ADF, DME, MKR, etc.) are used to con nect or
dis con nect head phone au dio to the se lected sys tem. If ADF au dio
is tog gled ON, the ADF au dio will be heard thru the air craft head -
phones. If ADF au dio is not de sired, for ex am ple af ter sta tion iden -
ti fi ca tion, sim ply tog gle the ADF switch to the OFF po si tion. The
ADF au dio vol ume should be ad justed to the de sired vol ume with
the ADF head phones au dio switch D in the ON po si tion; then the
switch D can be tog gled ON or OFF as de sired to pro vide or dis -
con nect ADF head phones au dio.
SCHWEIZER MODEL 269C-1 HELICOPTER
CSP-C1-1A
30
FAA Approved: 03 Oct 1995
Revised: 21 May 1997
