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6300 Rev H User's Manual
3.12
LEAK-CHECKING THE 6300
While performing an internal leak-check of the 6300 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 torque down adequately, even though O-rings are
provided on these fittings.
b.
When performing a leak-check at 50,000 feet, after the altitude has been reached, the unit must
be left in Control mode for a minimum of 5 minutes (preferably 10 minutes) to allow the
temperature effects to subside. Because of the small internal volume in the 6300, 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 6300, to the overall leak in the system. Typically, the
internal leak of the 6300 contributes less than 10% to the leak with the aircraft connected.
Therefore, an internal leak of 100 ft/min in the 6300 will contribute only 10 ft/min (or less) to the
leak measured with the aircraft connected.
To perform an internal leak-check of the 6300, follow these steps:
1.
Set the Leak-Timers to 1, 5 and 10 minutes. Set the units to knots and feet.
2.
Perform a Self-Test (TEST). Then close both output ports very tightly.
3.
Go-To-Ground. (GND)
4.
Set targets to 150 knots and 50,000 feet. Set Rate targets to 150 knots/min and 5000 feet/min.
GO.
5.
Once targets have been achieved, wait for a minimum of 5 minutes to allow temperature effects
to stabilize.
6.
Put both Pitot and Static outputs into Leak mode simultaneously. GO.
7.
Wait for the Leak-check to be completed, then note the Average per-minute leak rate (parameter
12 as described in Section 3.6.2) for Pitot and Static at the end of 10 minutes.
8.
The Average per-minute leak rate for Pitot (at the end of 10 minutes) should not exceed 1.0
knot/min.
9.
The Average per-minute leak rate for Static (at the end of 10 minutes) should not exceed 120
feet/min.
10. If the leak-rates exceed the maximum allowed, cancel out of the leak-screen and repeat the leak-
test from Step 5, after further tightening the caps on the output ports.
11. If the leak-rates continue to exceed the maximum allowed, the unit may need to be repaired.
12. Go-to-Ground. Reset the Leak-Timers to their original values. Turn Off the 6300.
125-9106A
Page 54
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