MOONEY
M20TN - MODEL TYPE-S
SECTION V
PERFORMANCE
5 -- 2
AIRPLANE FLIGHT MANUAL
ORIGINAL ISSUE -- 04-02-2008
INTRODUCTION
The purpose of this section is to present the owner or operator with information needed to facili-
tate planning of flights with reasonable accuracy.
The Performance Data and charts presented herein are calculated, based on actual flight tests
in dry air, with the airplane and engine in good condition and the engine power control system
properly adjusted.
The flight test data has been corrected to International Standard Atmosphere conditions and
then expanded analytically to cover various airplane gross weights, operating altitudes, and out-
side air temperatures.
VARIABLES
It is not possible to make allowances in the charts for varying levels of pilot technique, proficiency
or environmental conditions. Mechanical or aerodynamic changes are not authorized because
they can affect the performance or flight characteristics of the airplane. The effect of such things
as soft runways, sloped runways, winds aloft or airplane configuration changes must be evaluat-
ed by the pilot. However, the performance on the charts can be duplicated by following the stated
procedures in a properly maintained MOONEY M20TN.
Examples are given to show how each chart is used. The only charts with no example are those
where such an example of use would be repetitive.
To obtain effect of altitude and OAT on aircraft performance:
1.
Set altimeter to 29.92 and read “pressure altitude”.
2.
Using the OAT grid for the applicable chart read the corresponding effect of OAT on perfor-
mance.
--CAUTION--
Be sure to return to local altimeter setting in calculating aircraft elevation above
sea level.
OPERATIONAL PROCEDURES FOR MAXIMUM FUEL EFFICIENCY
Fuel efficiency (best defined as nmi/gal of fuel) is dependent on the proper use of the mixture
control. There are two recommended cruise settings for the TSIO--550--G ( ) engine described
in the following paragraphs. At all times engine limitations need to be observed.
Best Power
-- The Best Power setting will develop the maximum horsepower and speed for a
particular manifold pressure and RPM setting. Best Power mixture is desirable for minimizing
flight time when fuel burn rate or range is not a primary concern. When TIT limitations prevent
attaining peak TIT then best power is obtained at 1650
F TIT.
Best Power Procedure
-- Upon attaining level flight at cruise altitude set the manifold pressure
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 richen mixture until TIT indication is 50
F RICH OF PEAK. Re--adjust throttle or RPM as re-
quired.
