TM 1-1520-238-10
Change 9
4-16.1/(4-16.2 blank)
TADS for FD/LS by turning on the symbol generator to dis-
play the FD/LS on-command tests. The FD/LS tests may
request that the operator acknowledge that an action has
been completed. The method used to acknowledge (ACK)
is to press the SPACE key on the DEK
and
software. For
software the CDU SPC key must
be pressed.
4.16 AIR DATA SENSOR SUBSYSTEM (ADSS).
The ADSS consists of an omni-directional airspeed sen-
sor (OAS) and air data processor (ADP). The OAS (fig
2-2) measures the airspeed and temperature. The air data
processor senses static pressure and with the data from
the OAS calculates the air mass data required for fire con-
trol. The ADSS is interfaced with the multiplex bus through
the DASE MRTU (fig 4-8). The ADSS is turned on with the
switch labeled ADSS on the AUX/ANTI-ICE control panel
in the CPG left console (fig 2-12). If the ADSS fails or is
turned OFF, the displayed airspeed will revert to ground
speed in knots as computed by the doppler navigation
system. The ADSS receives 115 vac power from the No. 1
essential bus and 28 vdc from the No. 3 essential dc bus
and is protected by the AIR DATA AC and AIR DATA DC
circuit breakers on the pilot overhead circuit breaker pan-
el. The status of the ADSS is continuously monitored by
the Fault Detection/Location System (FD/LS); the on com-
mand test (test 01-ADS) will fault isolate to the specific
line replaceable unit (LRU).
