Figure 21-28. Evacuation Hookup
— Note —
For each 1,000 feet of elevation above sea level, the compound gauge reading will be
about one inch lower, numerically.
1. Remove access panel at the rear of the cabin to gain access to the Schrader service valves.
— CAUTION —
DETERMINE THAT ALL SYSTEM PRESSURE IS RELEASED BEFORE
ATTEMPTING TO EVACUATE THE SYSTEM.
2. Connect the manifold gauge set to the airplane service valves. (Refer to Figure 21-28.)
3. The high and low manifold hand valves should be in the closed position.
(Refer to Figure 21-25 and 21-26.)
4. 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.
988
NOTE
OPEN BOTH SERVICE VALVES
(COUNTERCLOCKWISE) ONE TURN
OUT
OPEN
OPEN
LOW
LOW
HIGH
HIGH
VACUUM PUMP
PRESSURE GAUGE SCHRADER VALVE
SCHRADER VALVE
EVAPORATOR
ASSEMBLY
MANIFOLD GAUGE
SET
COMPOUND GAUGE PULL 26 TO 28
INCHES VACUUM
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
2 1 - 5 2 - 0 7
Page 21-63
Revised: May 15, 1989
1H6
PIPER AIRCRAFT
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