Operating instructions

TM 11-5865-229-12
Turn aircraft console light control fully clockwise. Refer to aircraft manual for control location.
Put on aircraft headset and turn CCU VOLUME control fully clockwise.
Turn CCU mode switch clockwise from OFF to STBY.
● The WRMUP lamp will light for 3 minutes.
● After a 3-minute warmup time, all lamps light, tone is heard briefly in headset,
then all lamps turn off.
NOTE
The NO GO lamp may remain lit briefly after all other lamps have turned off. If the NO GO lamp
remains lit for more than 15 seconds, perform the operational test (paragraph 3–9).
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