MOONEY
M20V ACCLAIM ULTRA
SECTION V
PERFORMANCE
5
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3
AIRPLANE FLIGHT MANUAL
ORIGINAL ISSUE
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03-16-2017
Best Economy
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Best Economy mixture is desirable for maximizing range and minimizing fuel
cost. Best Economy is operated 50
F lean of peak TIT. The engine may be leaned up to 100
F
lean of peak however the fuel economy generally doesn’t improve beyond 50
F lean of peak.
Lean of peak operation is dependent on all cylinders running at nearly equal EGT. The first cylin-
der to reach an over lean condition will cause the engine to run rough. If at anytime during lean
of peak operation the engine begins to run rough the pilot should immediately richen the mixture.
If a smooth running engine cannot be attained at 50
F lean of peak maintenance action will be
required to restore balanced fuel flow to the cylinders and the pilot should choose an alternate
mixture setting and revise the flight plan accordingly. The pilot must follow the proper order for
changing the power settings (noted below and in SECTION IV) when transitioning back to rich
operation or a higher power setting.
Best Economy Procedure
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Upon attaining level flight at cruise altitude set the manifold pres-
sure and RPM as desired not exceeding 30.5 inHg. Slowly move the mixture control toward lean
while observing TIT indicator and maintaining TIT limits. If manifold pressure changes while
leaning readjust throttle and continue leaning until peak TIT is attained. Note peak TIT and slow-
ly lean mixture until TIT indication is 50
F LEAN OF PEAK. Re
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adjust throttle or RPM as re-
quired.
Above 30.5 inHg of manifold pressure only full rich mixture is permitted. At altitudes
above 22,000 feet, power settings above 2300 rpm must be operated at 1675
F TIT or
richer.
-CAUTION-
When changing power, the sequence of control usage is important. Monitor the TIT
display to avoid exceeding 1750
F limit. To increase power, first increase the mix-
ture (not necessarily to FULL RICH), then increase RPM with the propeller control
and then increase manifold pressure with the throttle control. To decrease power,
decrease manifold pressure first with the throttle control and then decrease RPM
with the propeller control. When engine temperatures have stabilized, lean mixture
to desired TIT.
-CAUTION-
PERFORMANCE CONSIDERATIONS
GENERAL
The cruise speed tables herein were established on a standard configuration M20V with an air-
speed boom installed. The standard configuration includes the airframe, standard paint job,
sanded walkway, Acclaim wingtips, flap seals, cowl exit vanes, standard antennae, standard
lights, and low drag nose gear doors. The standard configuration does not include De
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icing or
Air
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Conditioning provisions.
Supplemental Information Section IX
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