Chapter 7. Reference
74 | ADTS 405 R/F Mk2 Instruction Manual-English
© 2017 General Electric Company – All Rights Reserved.
7.2.6 ROC/Ps RATE
1.
In aeronautical units (ft or m), this key selects a Rate of Climb (ROC) or vertical speed
display.
2.
In pressure units (mbar, inHg etc.), this key selects a rate of change of Ps display.
3.
SETUP
, [UNITS] can be used to change the units, if setup mode is not switched off.
4.
In Control Mode (AIM display), a new ROC or Ps rate can be entered using the numeric
keys. Use
LEAK MEASURE/CONTROL
to change between control and measure
mode.
7.2.7 RATE TIMER
The
RATE TIMER
key starts an internal timer for one of three predefined times. On the
completion of the time period, the average rate of change over the time period is displayed.
Each selected TIME period can have an associated WAIT period to allow pressures to settle
before the timing starts. The WAIT period counts down to zero before the TIME period starts.
To use the rate timer:
1.
Press
RATE TIMER
.
2.
Press F1, F2 or F3 to select the required WAIT and TIME periods.
The main pressure displays shows the WAIT or TIME period counting down.
After timing, the timed average value, identified by a
T
directly to the right of the
value, replaces the instantaneous rate value. In measure mode the display changes to
show the timed rate of all associated parameters on the same screen. Pressing one of
the set-point keys (e.g., ALT, ROC, SPEED etc.,) or
CLEAR/QUIT
exits from this screen.
3.
At any time during rate timing or when a timed value is displayed, pressing the
RATE
TIMER
key allows for either the restarting or canceling of the timing. When timing is
canceled, the rate displays return to instantaneous values.
4.
The timed average value remains until a new aim is entered. During this time, it is
possible to view any parameter.
5.
The WAIT and TIME periods can be changed using
SETUP, RATE TIMER
, providing
SETUP lock is not enabled.
7.2.8 HOLD
When
HOLD
is pressed, a changing pressure is instantaneously held. Pressing
HOLD
again
releases the pressure to continue to the aim value. The
HOLD
facility applies to both
channels simultaneously. Two examples of how the HOLD facility can be used are shown
below:
7.2.8.1 Example 1 - Airspeed Switch Test
a.
Take the airspeed to a value just below the expected trip point.
b.
Enter a low rate of speed.
c.
Enter a new airspeed aim above the trip point.
