MooNEY
@--
OWNERS
MANUAL
Positive Control will hold an approximate heading over
a
period of time; however, it will not hold an exact heading
without the installation of a magnetic heading lock. To
check for
aP.C. malfunction while in flight, first establish
a moderate bank; then, release the- controls to see if the
aircraft will return to straight wings-level flight
as
indi-
cated by the artificial horizon.
Repeat the procedure with
a
turn in the opposite direction. Sluggish, erratic, or in-
complete bank recovery warns of a malfunction in the P.C.
system.
In the event of
a
complete engine power loss, P.C. will con-
tinue to operate as long as the propeller
is
windmilling at
1000
RPM
or more.
Loss of vacuum (indicated by a
LO
vacuum warning light) will automatically make the
P.C.
system inoperative. However, the turn coordinator will
continue to operate on electrical power. The turn coordi-
nator can be usedas a visual flight reference if other gyro
instruments become inoperative.
Proper fuel management during flight will help maintain
lateral trim and will also serve as a fuel quantity check.
After takeoff with both tanks full, use fuel from one tank
for one hour; then, switch to the other tank and note the
time. Use all the fuel from the second tank. The remain-
ing fuel endurance in the first tank can be calculated from
the
time it took to deplete the second tank, less one hour.
You must remember, however, that this endurance calcu-
lating procedure
canbe reliedupon only
if
power and mix-
ture remain the same
andan allowance
is
made for the ex-
tra fuel used during climb. For estimation purposes, con-
sider fuel cosumption
during a full-power climb to be
25
percent higher than that of best-power cruise, and
35
per-
cent higher than that of best-economy cruise.
CAUTION: Do not allow the engine to lose power or
quit before you switch fuel tanks.
If
a tank runs dry
and the engine quits, retard the throttle before re-
starting. Restarting with an
adva-need throttle may
cause engine overspeeding that can lead to mechanical
malfunction.
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