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