5 - 16 Testing and Fault Finding
K0260 Issue No. 8
TABLE 5-3 ERROR MESSAGES (CONTINUED)
No. Message Probable Cause Action
253 "Vacuum pump has stalled" Internal mechanical fault
Restart system, if fault repeats
-return unit to repair depot
254
"Pressure pump processor has
failed"
Internal fault Return unit to repair depot
255
"Pressure pump lead is
disconnected"
- Return unit to repair depot
256
"Pressure pump transistor is
faulty or drive inhibited"
Internal fault Return unit to repair depot
257 "Pressure pump has stalled" Internal mechanical fault
Restart system, if fault repeats
- return unit to repair depot
260
"Connected handset has failed to
respond. Disconnecting power."
Handset bad connection or
comms/power supply fault
Check connections and restart,
if fault repeats - return unit to
261
"Calibration switch has not
enabled."
Switch not selected Set calibration switch
262
"Valve characterisation data is
invalid. Restoring from FLASH."
Invalid/corrupted data, recovery
in progress
Allow for complete recovery
before continuing
263 to
290
"Valve constant out of range” Essential system data failure Return unit to repair depot
293
"Limit entry changed to MAX limit
set"
User tried to enter limit out of
range of instrument
Re-enter within maximum
range of instrument
295 "CAS is outside MAX limits"
Differential pressure applied at
Ps/Pt ports over-range
Check/reduce Ps/Pt pressure
applied to ADTS 505
296 "Alt is outside MAX limits"
Pressure applied at Ps port over-
range
Check/reduce Ps pressure
applied to ADTS 505
297
"ROC is outside MAX limits"
Rate of pressure change at Ps port
too high
Check/correct hose or aircraft
system Ps leak
298
"Qc is outside MAX limits"
Differential pressure applied at
Ps/Pt ports over-range
Check/reduce Ps/Pt pressure
applied to ADTS 505
299
"Ps is outside MAX limits"
Pressure applied at Ps port over-
range
Check/reduce Ps pressure
applied to ADTS 505
300
"RtPs is outside MAX limits"
Rate of pressure change at Ps port
too high
Check/correct hose or aircraft
system Ps leak
309
"Hand terminal short circuit" Faulty cable or hand terminal
Check cable, if necessary,
replace hand terminal
312 "RtCAS is fixed and cannot be
altered"
User attempted to enter
alternative RtCAS aim
None, RtCAS is pre-set and
locked at 300kts/min
313 "Calibration data not entered.
Enter calibration date"
Date entry step missed in
calibration procedure
Enter date field requested
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