LANCE
II SERVICE
MANUAL
The following steps should
be of help when performing
this operation.
a. Remove access panel at
the rear of the cabin to gain access to
the Schrader service
valves.
CAUTION
Ascertain that all system pressure is released before
attempting the evacuation.
(Refer to Paragraph
14-5.)
b. Connect the manifold gauge set to the airplane service valves. (Refer to Figure 14-6.)
c. The high and low manifold hand valves should be in the closed position. (Refer to
Figures 14-3 and 14-4.)
d. Connect the center manifold hose to the inlet of the vacuum pump.
NOTE
Make
sure the exhaust port
on the vacuum pump is
open to
avoid damage
to the vacuum
pump.
e. Start the vacuum pump and open the low side manifold hand valve. Observe the
compound, low pressure gauge needle, it should show a slight vacuum.
f. Continue to operate the vacuum pump until 26 to 28 inches of vacuum is attained
on the
low pressure
gauge,
then extend
the operation
for another
25 minutes.
g. If the system cannot maintain 26 to 28 inches of vacuum, close both manifold hand
valves and observe the compound gauge.
h. Should
the compound gauge show a loss of
vacuum, there is a leak in the system
which
must be repaired before
continuing with evacuation.
i. If no leaks are evident, reopen both manifold hand valves and continue the
evacuation for another 30 minutes.
j. Close both
manifold hand valves, stop vacuum
pump and disconnect center manifold
hose from the vacuum pump.
k. Proceed to
charge the system in accordance
with paragraph 14-14.
NOTE
The system should be charged
as soon as it has been
evacuated.
14-14. CHARGING THE SYSTEM. When the system is completely evacuated in
accordance
with instructions given in paragraph
14-13, one of the following procedures
should be used
to charge the
system.
2K6 ACCESSORIES AND UTILITIES
2K6
ACCESSORIES
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