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Number
Message
222
Pt PRESSURE FAIL
223
Pt VACUUM FAIL
301
LEAK RATE TOO HIGH
REGAINING CONTROL
302
OUTSIDE LIMITS
REGAINING CONTROL
303
ZERO OFFSET TOO LARGE
304
INITIALIZING SYSTEM
305
OUTSIDE LIMIT GO TO
GROUND
306
SWITCH PUMPS ON
307
COMMUNICATION RING
FAULT-PACKET IS
CORRUPT
308
UPDATING SYSTEM
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Table B-2: Warning Messages
Probable Cause
The Pt controller has
detected loss of supply
pressure and automatically
switched all channels to
measure mode. This can
occur at very high rates of
pressure change in large
volume systems if the
pumps cannot produce
enough pressure.
The Pt controller has
detected loss of supply
vacuum and automatically
switched all channels to
measure mode. This can
occur at very high rates of
pressure change in large
volume systems if the
pumps cannot produce
enough vacuum.
Control mode automatically
regained for aircraft safety
as leak rates too high.
Control mode automatically
regained for aircraft safety
as the measures values
have drifted outside the
operating limits due to
leaks.
The zero offset measured
during auto-zero was
outside.
This only occurs on main
system software upgrade.
Measured pressure is
outside new limits selected
or power-up limits.
Cannot select control mode
with pumps off.
Internal error.
Software upgrade.
Warning Messages
Action
Restore pressure supply
BEFORE going to control
mode again. Refer to main
fault finding chart in the
service manual.
Restore vacuum supply
BEFORE going to control
mode again.
Correct leak and retest.
Correct leak and retest. If
leak Ps, ensure that normal
Qc pressure is applied (e.g.
200 kts to avoid negative
airspeed).
Return to maintenance
depot for calibration.
If message occurs during
normal operation, return to
maintenance depot.
Control pressure to within
limits.
Switch pumps on.
If the fault can be repeated,
return to maintenance
depot.
Wait 1 minute.
ADTS 405 R/F Mk2 Instruction Manual-English | 119
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