56-101-01175 Revision P Page | 36
3. After a Go To Ground function is performed, the Test Set will remain vented to
ambient
until “Ok” is selected.
Note:
Selecting “Ok” results in the internal ambient valve closing. The unit is now a
sealed system, no longer vented to ambient. Under these conditions it is normal
for the displayed ALT and CAS values to be affected over time by thermal
conditions changing within the Test Set. Since the pneumatics are now
internally sealed, the effects of rising or falling temperatures results in the
expansion/contraction of gas, the gas being air in this application. This, of
course, will cause the displayed values for ALT and CAS to slowly vary based
on internal adiabatic
“expansion/contraction of gas” conditions.
F.
Setup 1:
The following is available under this set of menus:
Main Menu: Page 2, Setup 1 (refer to Figure 39)
Figure 39
Setup 1
1.
Auto Leak Recovery:
When the Test Set is operating in Leak Measure mode and
Auto Leak Recovery is Enabled. If a high leak rate occurs (High ROC or RtCAS), then
ALR will automatically activate CONTROL mode which will then set ALT target and
CAS target to present level and the controller will come online and try to maintain the
current Altitude and CAS. To disable this feature, select Disable Auto Leak Recovery.
2.
Limits View / Select:
Allows user to select and view any of the saved limit file values.
3.
Altitude Correction:
Allows user to enter a correction factor regarding the altitude
difference between the physical Test Set and the Aircraft ports and or Unit under test.
Below is an example of the Aircraft static port being located 20 ft. physically higher
( + ) than where the Test Set is located (refer to Figure 40, Figure 41, Figure 42, and
Figure 43).
Note:
If the Test Set was physically higher than the instrument or aircraft, then the
altitude correction would be entered as a negative ( - ) value.