331
Federal Aviation Administration, DOT
Pt. 60, App. D
2.d.2.
.....................
Directional Static Sta-
bility.
Lateral Control Position—
±
10% of
change from trim or
±
0.25 in.
(6.3 mm) or Lateral Control
Force—
±
0.5 lb. (0.223 daN) or
10%. Roll Attitude—
±
1.5 Direc-
tional Control Position—
±
10%
of change from trim or
±
0.25 in.
(6.3 mm) or Directional Control
Force—
±
1 lb. (0.448 daN) or
10%. Longitudinal Control Posi-
tion—
±
10% of change from trim
or
±
0.25 in. (6.3 mm). Vertical
Velocity—
±
100 fpm (0.50m/
sec) or 10%.
Cruise; or Climb
(may use Descent
instead of Climb if
desired) Aug-
mentation On and
Off.
Record results for at least two
sideslip angles on either side of
the trim point. The force may
be shown as a cross plot for ir-
reversible systems. May be a
series of snapshot tests.
X
X
X
This is a steady heading
sideslip test at a fixed
collective position.
2.d.3.
.....................
Dynamic Lateral and Directional Stability.
2.d.3.a.
..................
Lateral-Directional Oscil-
lations.
±
0.5 sec. or
±
10% of period.
±
10% of time to
1
⁄
2
or double
amplitude or
±
0.02 of damping
ratio.
±
20% or
±
1 sec of time
difference between peaks of
bank and sideslip. For non-peri-
odic responses, the time history
must be matched within
±
10
knots Airspeed;
±
5
°
/s Roll Rate
or
±
5
°
Roll Attitude;
±
4
°
/s Yaw
Rate or
±
4
°
Yaw Angle over a
20 sec period roll angle fol-
lowing release of the controls.
Cruise or Climb Aug-
mentation On and
Off.
Record results for at least two air-
speeds. The test must be initi-
ated with a cyclic or a pedal
doublet input. Record results
for six full cycles (12 over-
shoots after input completed) or
that sufficient to determine time
to
1
⁄
2
or double amplitude,
whichever is less. The test may
be terminated prior to 20 sec if
the test pilot determines that
the results are becoming un-
controllably divergent.
X X X
2.d.3.b.
..................
Spiral Stability
...............
±
2
°
or
±
10% roll angle
.................
Cruise or Climb. Aug-
mentation On and
Off.
Record the results of a release
from pedal only or cyclic only
turns for 20 sec. Results must
be recorded from turns in both
directions. Terminate check at
zero roll angle or when the test
pilot determines that the atti-
tude is becoming uncontrollably
divergent.
X X X
2.d.3.c.
...................
Adverse/Proverse Yaw
..
Correct
Trend,
±
2
°
transient side-
slip angle.
Cruise or Climb. Aug-
mentation On and
Off.
Record the time history of initial
entry into cyclic only turns,
using only a moderate rate for
cyclic input. Results must be
recorded for turns in both direc-
tions.
X X X
3. Reserved
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