6600-NG User’s Manual
125-9110A
Page 51
When
CANC
is pressed to exit out of Leak mode, the 6600-NG automatically goes back to Control mode.
Instant Ps2 leak rate:
While the leak-check is going on, the Actual values are still updated every 250
msec in the Upper section of the screen. The Actual Ps1 Rate is the “instant” leak rate and will instantly
indicate any change in the leak. This is especially helpful when adjustments are made to the Ps1 system
(including tightening fittings, adjusting adapters etc) to reduce the leak.
Excessive Ps2 Leak:
If the ‘instant’ leak-rate is excessive, to protect the aircraft instruments, the 6600-NG
will automatically put Ps2 back into Control mode and abort the leak check. An error message:
ERR 8: Ps2 leak excessive. Exiting Leak mode.
Press
CANC
will be displayed on the last line of the screen. Pressing
CANC
will clear the Lower section.
Simultaneous Pt, Ps2 and Ps1 Leak
To leak-check Pt, Ps2 and Ps1 outputs simultaneously, all three outputs should be changed to Leak,
before pressing
GO
.
Assuming that the simultaneous leak check needs to be done with all three outputs in “inHg” at values of
Pt=24 inHg, Ps2=23 inHg and Ps1 at 22 inHg, follow the steps below.
1.
Close all three output ports (tightly, please).
2.
Set the Units as follows: Pt=inHg, Ps2=inHg, Ps1=inHg. (Key sequence:
1, 5, ENTER, 9, 1,
ENTER, 5, 3, ENTER, GO
)
3.
Set all three Rate Targets to 4.0 inHg/min. (Key sequence:
3, 4, ENTER, period, 4, ENTER, 7, 4,
ENTER, GO
)
4.
Press
GND
to perform the Go-To-Ground function. The pumps will turn On and the tester will
go through the EQZN process. All three targets will automatically be set to the ambient
(“Ground”) pressure in inHg.
5.
Once the EQZN process is completed, the tester will control the Actual values at the Targets.
6.
Change the Targets to Pt=24, Ps2=23 and Ps1=22. (Key sequence:
2, 2, 4, ENTER, 0, 2, 3, ENTER,
6, 2, 2, ENTER
) The new Target value will be blinking. Press
GO
to activate. All three Actual
values will ramp to their targets.
7.
Once all three Actual values reach their target, allow them to stabilize for a few seconds.
8.
Change all three modes to Leak. (Key sequence:
4, 1,
±, 2, 8, 2
). ‘Leak’ will be blinking in all three
mode fields. Press
GO
to activate.
The Lower section of the screen will appear similar to Figure 3.38 below, with the 1-min, 2-min and 3-min
values appearing as the leak time crosses 1, 2 and 3 minutes.
