USArmy-ApacheLongbow

TM 1-1520-251-10
Table 3-3B.
HF Radio Advisory/Status Message
Table
3.53H KY-100 HF RADIO COMMUNICATION
SECURITY SYSTEM
Advisory/Status
Message
ANT TUNING
ANT UNTUNED
CALLING
CALL FAILED
CALL RESPND?
CHECK MSG
FILL CHECK
FILL PROCESS
FILL RECVING
FILL WAITING
GO DATA ONLY
LINKED
PP RECEIVED
RECVING CALL
RECVING DATA
SOUNDING
SENDING DATA
SENDING TIME
STANDBY
SYNCING
TIME SYNC
FAIL
UNSYNC
XMIT READY
ZEROIZED
Description
Radio is tuning the antenna
Radio ECCM net is not pre-tuned
An ALE call is being transmitted
ALE call has failed on all attempts.
ALE call detected: however, radio
set to SILENT mode, crew must
press PTT to establish call.
Radio received text message: can
be reviewed and/or deleted.
Radio is checking fill data.
Radio is processing fill data.
Radio is receiving fill data.
Radio is waiting for fill data.
Transmission quality poor, should
switch to data transmission only.
ALE link established
Radio received a present position
report; can be stored or deleted.
Incoming ALE call being received.
Radio is receiving digital data.
Radio is sounding.
Radio is sending digital data.
Radio is sending the current time.
Radio is in standby mode.
Radio is synchronizing.
Synchronized time between radios
has failed
Radio is currently not synchronized.
Radio has transmitted ECCM
preamble and is ready to transmit.
Radio is being zeroized.
The aircraft has one TSEC/KY-100 Communications Security
System which provides encrypted communications
for the HF radio. The TSEC/KY-100 transforms voice,
digital data, or analog data into ciphertext information.
The TSEC/KY-100 has the capability to store up to six
Crypto Net Variables (CNV). CNVs are COMSEC variables
required to establish the encryption process inside
the TSEC/KY-100. CNVs are generally loaded directly
into the TSEC/KY-100 with a fill device at the Remote Selectable
Fill Port, but may also be loaded through RF Link.
TSEC/KY-100 controls are implemented on the MPD.
3.53I APX-100 TRANSPONDER
The aircraft contains one transponder, an APX-100 or
APX-118 (para 3.53J) which provides automatic radar
identification of the aircraft to all suitably equipped stations.
The transponder receives, decodes, and responds
to interrogation of the following modes:
MODE 1
MODE 2
MODE 3/A
MODE C
Provides 32 possible code
combinations that can be selected
in-flight. Possible code combinations
are: 00-03, 10-13, 20-23, 30-33, 40-43,
50-53, 60-63, and 70-73.
Provides 4096 possible code
combinations. The desired code must
be set on the ground on the APX-100
located behind access panel L160.
Possible code combinations are
0000-7777.
Provides 4096 possible code
combinations that can be selected
in-flight. Possible code combinations
are 0000-7777.
Provides altitude information obtained
from the FMC.
3.53I.1 KIT-1C MODE 4 Computer. Provides a cryptosecure
mode of identification for the APX-100 transponder
by relying on an encrypted interrogation. It utilizes two
classified operational codes which are loaded directly into
the KIT-1C computer via a fill device through the Remote
Selectable Fill Port in the aft avionics bay. Code selection
3-66.4 Change 3
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