Laversab 6600 User Manual page 63

13. Repeat steps 9 through 12 for performing a leak check on the Ps2 output. This needs to be
done only if the Ps2 output is connected to the aircraft.
14. Now that all three systems are reasonably leak-tight, start your checkout procedure for
checking the instruments inside the aircraft. At this point you may want to execute the
appropriate Profile for your test.
Caution: During your tests, do not put Pt, Ps1 or Ps2 outputs in MEASURE mode unless
the aircraft is at "Ground". Use only the Control and Leak modes. If the Ps2 output is not
connected to the aircraft then the Ps2 output must be in units of Dfin, the Ps2 target value
must be 0.000 and Ps2 must always be in Control mode.
15. After you finish the last point of your test procedure, select Function 8: "Go to Ground".
If you are executing a profile, this should already be part of your profile. The targets will
get set to 20 knots for Pt and 185 feet (Your Ground) for Ps1 and Ps2.
16. After the targets have been achieved, set Pt, Ps1 and Ps2 outputs to MEASURE mode.
This should be part of your profile. Alternately, you can simply turn OFF the 6600.
17. Turn OFF the 6600.
18. Disconnect the hoses from the aircraft and from the 6600.
During your test procedure, if you lose power, the 6600 will maintain the pressure. When
power comes back on, the 6600 and the aircraft will be at the same pressure as before except
for pressure lost due to leaks in the system.
If the 6600 behaves erratically for whatever reason, turn OFF the 6600 using the ON/OFF
switch on the Remote unit. Turn the unit back ON after 30 seconds and attempt to use the
6600 again.
The 6600 is capable of overcoming substantial leaks in the system. It is not capable of
overcoming extremely large leaks. Therefore it is essential that the system be reasonably leak-
tight before taking the aircraft to higher altitude or airspeed. During a leak check, a leak of
more than 2000 feet/min. either on the Ps1 or Ps2 outputs, or a leak of more than 50
knots/min on the Pt output, will immediately cause the 6600 to exit the Leak screen and go
back into Control mode automatically. A message will indicate that a large leak exists. Go
back to Ground and go through the leak test process shown above, to find and fix the leak
before proceeding further.
It may be helpful to keep a copy of the procedure, shown in Figure 5.1, with the 6600 to assist
the operator while using the 6600.
56