Piper CHEROKEE D - Page 37

CHEROKEE "D" SECTION Ill
b. Vacuum lines could be collapsed or broken.
c. Vacuum pump, worn.
d. Vacuum regulator, not adjusted correctly. The pressure,
even
though set correctly, can read lower under two conditions: (1)
very high
altitude, above 12,000 feet, (2) low engine rpm, usually on
·approach or during training maneuvers. This is normal and should not
be considered a malfunction.
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