6600-NG User’s Manual
125-9110A
Page 66
Note: It is possible to operate the 6600-NG while the battery is being charged.
Section 3.2 provides details of the battery-charge percentage that is displayed on the Remote unit while
the unit is in operation.
3.12
LEAK-CHECKING THE 6600-NG
While performing an internal leak-check of the 6600-NG itself, it is important to keep in mind several
issues that significantly affect the results of this leak-check.
a.
The fittings on the output ports must be torqued down adequately, even though O-rings are
provided on these fittings.
b.
When performing a leak-check at 5 inHg, after the target has been reached, the unit must be left
in Control mode for a minimum of 10 minutes to allow the temperature effects to subside.
Because of the small internal volume in the 6600-NG, temperature effects are greatly amplified
and appear (incorrectly) as a leak to the user.
c.
Temperature effects do not have a major impact on the leak-rate when the tester is connected to
an aircraft through hoses. The additional volume in the system when the aircraft is connected
helps in negating the temperature effects.
d.
The additional volume when the aircraft is connected also helps in significantly reducing the
contribution of the internal leak of the 6600-NG, to the overall leak in the system. Typically, the
internal leak of the 6600-NG contributes less than 10% to the leak with the aircraft connected.
Therefore, an internal leak of 100 ft/min in the 6600-NG will contribute only 10 ft/min (or less) to
the leak measured with the aircraft connected.
To perform an internal leak-check of the 6600-NG, follow these steps:
1.
Set the Ps1 units to Feet. Note the Ps1 Rate Target value (needed at end of test). Set the Ps1 Rate
target to 10,000 ft/min,
GO
.
2.
Set the Leak-Timers to 1, 2 and 3 minutes. Set the Units to Pt=Pt inHg, Ps2=inHg, Ps1=inHg.
3.
Set all 3 Rate Targets to 4.0 inHg/min.
4.
Perform a Self-Test (
TEST
). Then close all three output ports very tightly.
5.
Go-To-Ground. (
GND
)
6.
Set the Pt, Ps2, Ps1 Target values to 5.0 inHg.
GO
.
7.
Once all 3 targets have been achieved, wait for a minimum of 10 minutes to allow temperature
effects to stabilize. (All 3 outputs must remain in Control mode)
8.
Put all 3 outputs into Leak mode simultaneously.
GO
.
9.
After 1 minute in Leak mode, the leak values will be updated. The total leak shown for each of
the outputs must not exceed 0.0200 inHg.
10.
If the total leak exceeds the maximum allowed, cancel out of the leak-screen and repeat the leak-
test from Step 7,
after further tightening the caps on the output ports
.
11.
If the total leak continues to exceed the maximum allowed, the unit may need to be repaired.
12.
Go-to-Ground. (
GND
). After Ground is achieved, change Ps1 units to Feet and reset the Ps1 Rate
Target to its original value.
GO
.
13.
Turn Off the 6600-NG.
