Fault Finding - GE Druck ADTS 505 User Manual

5 - 14
5.6

Fault Finding

System Messages
In the event of a malfunction, the built-in, self-test and diagnostic system displays a message

and a code. The message heading Error indicates a fault or condition that interrupts normal
operation. The following tables list the error messages with the probable cause and action to
be taken.
If the display shows a message not listed in the tables the unit must be switched off. If the

display shows the same non-operational message after switching on, the unit should be
returned to the repair depot.
No. Message
Autoleak recovery
7
activated
31 Test set must be at ground Invalid user request
32 Pressure leak in Ps.
33 Pressure leak in Pt.
36 Ps Aim Overshoot.
"Ps aim value
37
unobtainable".
40 Pt Aim Overshoot.
"Pt aim value
41
unobtainable".
4 Vacuum leak in Ps.
4 Vacuum leak in Pt.
Ps pressure control valve
4
cannot be calibrated.
56 Stabilising Qc to Zero.
Current Pressure Limits
57
Exceeded.
Note: In No. 56, this safety feature opens the zero valve. If this happens constantly, check for leaks.
K0260 Issue No. 8
Probable Cause
Excessive leak rate detected in Ps/Qc
pressures
Leaking Ps channel pressure control
valve.
Leaking Pt channel pressure control
valve.
Connected system leak rate
changing.
Leak rate on Ps too high to control.
Connected system leak rate
changing.
Leak rate on Pt too high to control.
Leaking Ps channel vacuum control
valve.
Leaking Pt channel vacuum control
valve.
Valve fault.
Possible negative airspeed detected,
possible sudden leak.
Limits for Ps or Qc exceeded.
T 5-3 E M
ABLE RROR
Testing and Fault Finding
Check hoses and aircraft systems for
leaks
Select Go to Ground first
Return unit to repair depot.
Return unit to repair depot.
Check hoses and aircraft systems for
leaks.
Check port caps, hoses and
connectors for leaks.
Check hoses and aircraft systems for
leaks.
Check port caps, hoses and
connectors for leaks.
Return unit to repair depot.
Return unit to repair depot.
Return unit to repair depot.
System zero valve opened to stop
negative airspeed condition.
Make sure pressures are within limits,
check leak rates.
ESSAGES
Action