Operating instructions

TM 11-5865-229-12
SECTION II
OPERATION UNDER USUAL CONDITIONS
SECTION CONTENTS
PAGE
GENERAL
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OPERATING INSTRUCTIONS
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2-3 GENERAL.
a. Weather Conditions. The CM Set can be operated in all types of weather. There are no special
instructions to be followed in case of bad weather.
b. Built-in Test. CM Set LRUs are automatically tested during operation by the Built-in Test (BIT)
function. BIT alerts the operator to LRU failures by lighting the NO GO lamp on the CCU. The
operator can manually initiate BIT to verify CM Set operation by depressing the BIT switch on the
CCU. Operator-initiated BIT is indicated by the SELF TEST lamp on the CCU. If the NO GO lamp
remains lit during operation for more than 15 seconds, perform the operational test (paragraph 3–9).
c. Warning Tone. The CCU generates an audio warning tone and sends it to aircraft headsets whenever
the CM Set receives a threat radar signal. The loudness of the warning tone can be adjusted with the
VOLUME control on the CCU.
d. Aircraft Survivability Equipment (ASE) Panel. The ASE panel provides CM Set status indicators in
addition to those provided by the CCU. Refer to the applicable aircraft manual listed in Appendix A
for specific ASE panel information.
2-4 OPERATING INSTRUCTIONS.
Operating instructions for the CM Set are described in the following steps. If there are any problems during
operation, perform the operational test (paragraph 3-9).
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Initiating BIT causes the CM Set to suspend jamming for a minimum period of five seconds. Do
not initiate BIT during a mission when the threat and/or jam indicators are illuminated and/or
the audio warning tone is heard. Failure to observe this precaution may result in the loss of crucial
jamming time.
If the CM Set has not been operated for six months or you are uncertain when it was last operated,
set the CCU mode switch to the STBY position for a minimum of 30 minutes to season (stabilize)
the TWT. Failure to do so may destroy the TWT.
NOTE
Make sure aircraft power is on before beginning operation. Refer to aircraft manual for instructions.
If the CM Set is turned off for 30 seconds or longer, operation cannot start without a 3-minute warmup
period.
If the CM Set is turned off during operation for less than 30 seconds, the warmup period will be less than 3
minutes.
Always turn the CM Set off when it is not in use.
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