GE Druck ADTS 405

K114 Issue No. 9
3 - 20 Operation
 Using the SETUP function, previously stored sets of limits can be recalled for use. Each
set of limits is stored under an aircraft name. Three pre-defined sets of limits
“Standard“, “Civil“ and “Max“ limits are supplied with the ADTS 405.
Note: The ADTS 405, when delivered, contains "Standard" and "Civil" limits; to set and store
"Max" limits, for the first time, enter configuration. The "Max" limits depend on the
range of the pitot channel either 850 or 1000 knots, see section 1.3, operating limits.
To select the limits in use:
 Press SETUP.
 Select [LIMITS].
 Use [NEXT] or [PREV] to select the limits required. Each set of limits
is identified by its name, including the pre-defined sets of limits (“Standard“, “Civil“
and "Max" see section 1.3, operating limits).
 Select [SEL] to select the limits.
 Press QUIT/CLEAR to return to the pressure display.
 Using the CONFIGuration function, new sets of limits can be created and existing sets of
limits can be edited. In addition, the set of limits in use at power-up can be selected. If
required, this selection can be locked to prevent unauthorised changing of the limits.
Auto recovery facilities
 The pressure controllers in the ADTS 405 can "feed" a leak in an aircraft system. When
first testing an aircraft system, a leak test must be carried out at low altitude and
airspeed.
 If, during a leak test, a leak in the system produces a rate of climb greater than the rate
set in limits or a rate of change of airspeed greater than the rate set in limits, then the
pressure controllers automatically regain control to minimise damage to the aircraft
system. This AUTO LEAK RECOVERY facility can be disabled.
 If a leak causes the system pressures to exceed any limit during a leak test, the
pressure controllers automatically regain control. This AUTO LIMIT RECOVERY system
can be disabled.
 If negative airspeed (or Qc) occurs in measure mode, the zero value is automatically
opened for one second to balance the airspeed. This only applies when the minimum
CAS (or Qc) limit is zero.
 Limits cannot be changed with SETUP switched off or Limit Lock enabled.