56-101-01178 Revision K
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3.
If performing a Pitot only test, configure the 1811NG to “1-Channel Pt only” mode as
follows:
Note
: Test Set should be “Vented” to ambient and in Leak Measure mode at this
time.
a) From the Main Menu screen,
select the blue button “page2”.
b)
Select the “Additional Functions” button. A screen is displayed with three options.
c) Touch
“Control Mode”. Control Mode screen opens with two selections.
d)
Select “Control Mode (Pt Only)”.
e)
Touch “Exit” twice. Select “page 1”.
Note
: The UI display is now positioned back to the Main Menu.
4. If not already done, perform a Leak Test on the Test Set and hoses.
Note
: CAP the aircraft end of each hose.
5. Connect the hoses to the aircraft Pitot ports.
Note
:
While testing the Pitot (Pt) system with Test Set configured as “1-Channel Pt
only” mode, the Static (Ps) channel of the Test Set will remain vented to ambient,
this is the same point of reference the aircraft’s Static port is referencing while
driving the Pitot system with the Test Set.
a)
If the Test Set is configured in its default “2-Channel Ps & Pt” mode, the Target
value for ALT should always remain at ambient Ground pressure altitude (value
determined from the last Go To Ground). While testing various CAS values, the
Tester will maintain ambient pressure altitude equivalent on the Static (Ps) port.
b) It is very important that the Test Set maintains ALT = ambient pressure altitude
especially if the Static (Ps) hose is not connected to the aircraft’s Static system.
6. Verify if the alternate pneumatic system(s) (co-pilot, standby auxiliary, etc.) shares the
same pneumatic lines. If so, they must be sealed or isolated from the current pneumatic
system about to be tested.
7. If necessary, change the displayed parameters on the Test Set to those required.
a)
From the main menu, select “Display Setup”.
b)
On the “Display Setup” screen, select the desired aeronautical parameters.
8. If necessary, different units can be
selected by touching “Units” from the Main Menu.
9. Verify the limits selected are appropriate for the aircraft and or Instruments that are
going to be tested.
10. At this time confirm the following has been accomplished:
a) The Test Set and hose combination have been leak tested.
b) The Test Set Pitot (Pt) has been connected to the aircraft or instrument to be
tested.
c) The Test Set limits have been configured with the appropriate values to protect the
aircraft system or instrument(s) about to be tested.
11. Select the Control key.
a) The Test Set will transition from Leak Measure to Control mode. You will notice the
ALT and CAS target will be preloaded with the current pressure altitude and CAS
values.
b) Wait for Resuming Control phase to complete (typically 4 seconds).