Operating Procedures
© 2015 General Electric Company – All rights reserved. ADTS 405 Mk2 Instruction Manual-English | 33
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.
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.
3.5.6 Changing Parameters
3.5.6.1 Mach Test and Constant Mach
To go to 0.8 Mach, enter Control Mode and proceed as follows:
a. Press SPEED then RATE to select rate of change of airspeed.
b. Enter required rate, e.g. 300 kts/min.
c. Press MACH.
d. Enter 0.8.
e. Wait for the Mach to be achieved.
Note: If the altitude changes the system automatically adjusts the airspeed to
keep the Mach value constant.
3.5.6.2 True Airspeed
The normal airspeed parameter is Calibrated Airspeed (CAS) (equivalent to IAS for testing
purposes).
The airspeed parameter may be changed to True Airspeed (TAS) as follows:
a. Press SETUP then SPEED.
b. Select [CAS/TAS].
c. Select [TAS].
d. Press QUIT/CLEAR repeatedly to exit set-up.
e. Press SPEED.
The display now shows the airspeed parameter as TAS.
Note: Airspeed parameter type can only be changed in Full Set-up mode. Rate of
change of airspeed will still be shown as Rate CAS.
Pitot temperature (Θt) is used in the calculation of TAS. Pitot temperature can only be changed in
Full Set-up mode. To enter (Θt):
a. Press SETUP.
b. Press SPEED.
c. Select [Pt TEMPERATURE].
d. Enter the temperature measured by the aircraft's Pitot temperature sensor.
e. Press QUIT/CLEAR three times to return to user display.
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