AOPA Pilot Magazine - August 2021 - 92

RUDDER & WRENCH
the ground in an unfortunate way? Thus, the most reasonable
technique involves holding the yoke in a neutral position and
relying on the inherent aircraft stability for the oscillations to
settle. With a sufficiently long runway, it might be possible to
flare anew but if there is any doubt, add power and clean up the
aircraft to go around for an approach with a more responsible
airspeed. This time be sure to use the elevator trim to assist in
holding the planned approach speed. In gusty conditions, adding
half the gust factor to the approach speed makes sense but
adding more increases the chances of a PIO and guarantees that
more time and distance will be needed to dissipate the energy
needed to land and stop on the runway.
It's puzzling that pilot-induced oscillations are nowhere
to be found in the airman certification standards. In fact, the
allowed tolerances in the private pilot ACS even set the stage
for a PIO to occur. The standards allow for an approach airspeed
10 knots faster than 1.3 VS0
after the appropriate gust factor has
92
been applied. For example, on short final in my Beechcraft
Bonanza, I hold 70 knots (1.3 times 54) before I commence the
flare. Were the ASOS to report 12 knot winds with gusts to 22
knots, I would add half the gust factor (22-12)/2=5 knots to my
approach speed and maintain 75 knots instead. Private ACS
standards then allow for an 85-knot approach speed. Not only
does that make a PIO scenario likely, but that higher airspeed
on final can add more than 50 percent to my landing distance.
Even more perplexing is the omission of pitch control in
the Airplane Flying Handbook's " Ballooning During Round
Out " discussion: " By adding power, thrust is increased to keep
the airspeed from decelerating too rapidly and the wings from
suddenly losing lift, but the throttle must be closed immediately
after touchdown. " On short final the aircraft should be
operating on the back side of the power curve in which power
controls altitude and pitch controls airspeed. But the Airplane
Flying Handbook does not mention proper use of pitch control
to remedy the unfortunate situation.
Pilot-induced oscillations represent one way an aircraft
can lose control during the landing process. The
video Avoiding LOC-G by the AOPA Air Safety Institute
(airsafetyinstitute.org/insurance/avoiding-loc-g) reports
that these loss-of-control incidents usually occur from
higher-than-necessary approach speeds and they rank
as the second most expensive of aviation insurance
claims. If your own training did not include recoveries
from pilot-induced oscillations, make them part of
your next flight review. You'll extend the life of your
airplane, and with fewer such claims we will all benefit
when it's time to renew our aircraft insurance.
Catherine Cavagnaro is an aerobatics instructor and professor
of mathematics at Sewanee: The University of the South.
aceaerobaticschool.com
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AOPA Pilot Magazine - August 2021

Table of Contents for the Digital Edition of AOPA Pilot Magazine - August 2021

Contents
AOPA Pilot Magazine - August 2021 - Intro
AOPA Pilot Magazine - August 2021 - BB1
AOPA Pilot Magazine - August 2021 - BB2
AOPA Pilot Magazine - August 2021 - Cover1
AOPA Pilot Magazine - August 2021 - Cover2
AOPA Pilot Magazine - August 2021 - Contents
AOPA Pilot Magazine - August 2021 - 2
AOPA Pilot Magazine - August 2021 - 3
AOPA Pilot Magazine - August 2021 - 4
AOPA Pilot Magazine - August 2021 - 5
AOPA Pilot Magazine - August 2021 - 6
AOPA Pilot Magazine - August 2021 - 7
AOPA Pilot Magazine - August 2021 - 8
AOPA Pilot Magazine - August 2021 - 9
AOPA Pilot Magazine - August 2021 - 10
AOPA Pilot Magazine - August 2021 - 11
AOPA Pilot Magazine - August 2021 - 12
AOPA Pilot Magazine - August 2021 - 13
AOPA Pilot Magazine - August 2021 - 14
AOPA Pilot Magazine - August 2021 - 15
AOPA Pilot Magazine - August 2021 - 16
AOPA Pilot Magazine - August 2021 - 17
AOPA Pilot Magazine - August 2021 - 18
AOPA Pilot Magazine - August 2021 - 19
AOPA Pilot Magazine - August 2021 - 20
AOPA Pilot Magazine - August 2021 - 21
AOPA Pilot Magazine - August 2021 - 22
AOPA Pilot Magazine - August 2021 - 23
AOPA Pilot Magazine - August 2021 - 24
AOPA Pilot Magazine - August 2021 - 25
AOPA Pilot Magazine - August 2021 - 26
AOPA Pilot Magazine - August 2021 - 27
AOPA Pilot Magazine - August 2021 - 28
AOPA Pilot Magazine - August 2021 - 29
AOPA Pilot Magazine - August 2021 - 30
AOPA Pilot Magazine - August 2021 - 31
AOPA Pilot Magazine - August 2021 - 32
AOPA Pilot Magazine - August 2021 - 33
AOPA Pilot Magazine - August 2021 - 34
AOPA Pilot Magazine - August 2021 - 35
AOPA Pilot Magazine - August 2021 - 36
AOPA Pilot Magazine - August 2021 - 37
AOPA Pilot Magazine - August 2021 - 38
AOPA Pilot Magazine - August 2021 - 39
AOPA Pilot Magazine - August 2021 - 40
AOPA Pilot Magazine - August 2021 - 41
AOPA Pilot Magazine - August 2021 - 42
AOPA Pilot Magazine - August 2021 - 43
AOPA Pilot Magazine - August 2021 - 44
AOPA Pilot Magazine - August 2021 - 45
AOPA Pilot Magazine - August 2021 - 46
AOPA Pilot Magazine - August 2021 - 47
AOPA Pilot Magazine - August 2021 - 48
AOPA Pilot Magazine - August 2021 - 49
AOPA Pilot Magazine - August 2021 - 50
AOPA Pilot Magazine - August 2021 - 51
AOPA Pilot Magazine - August 2021 - 52
AOPA Pilot Magazine - August 2021 - 53
AOPA Pilot Magazine - August 2021 - 54
AOPA Pilot Magazine - August 2021 - 55
AOPA Pilot Magazine - August 2021 - 56
AOPA Pilot Magazine - August 2021 - 57
AOPA Pilot Magazine - August 2021 - 58
AOPA Pilot Magazine - August 2021 - 59
AOPA Pilot Magazine - August 2021 - 60
AOPA Pilot Magazine - August 2021 - 61
AOPA Pilot Magazine - August 2021 - 62
AOPA Pilot Magazine - August 2021 - 63
AOPA Pilot Magazine - August 2021 - 64
AOPA Pilot Magazine - August 2021 - 65
AOPA Pilot Magazine - August 2021 - 66
AOPA Pilot Magazine - August 2021 - 67
AOPA Pilot Magazine - August 2021 - 68
AOPA Pilot Magazine - August 2021 - 69
AOPA Pilot Magazine - August 2021 - 70
AOPA Pilot Magazine - August 2021 - 71
AOPA Pilot Magazine - August 2021 - 72
AOPA Pilot Magazine - August 2021 - 73
AOPA Pilot Magazine - August 2021 - 74
AOPA Pilot Magazine - August 2021 - 75
AOPA Pilot Magazine - August 2021 - 76
AOPA Pilot Magazine - August 2021 - 77
AOPA Pilot Magazine - August 2021 - 78
AOPA Pilot Magazine - August 2021 - 79
AOPA Pilot Magazine - August 2021 - 80
AOPA Pilot Magazine - August 2021 - 81
AOPA Pilot Magazine - August 2021 - 82
AOPA Pilot Magazine - August 2021 - 83
AOPA Pilot Magazine - August 2021 - 84
AOPA Pilot Magazine - August 2021 - 85
AOPA Pilot Magazine - August 2021 - 86
AOPA Pilot Magazine - August 2021 - 87
AOPA Pilot Magazine - August 2021 - 88
AOPA Pilot Magazine - August 2021 - 89
AOPA Pilot Magazine - August 2021 - 90
AOPA Pilot Magazine - August 2021 - 91
AOPA Pilot Magazine - August 2021 - 92
AOPA Pilot Magazine - August 2021 - 93
AOPA Pilot Magazine - August 2021 - 94
AOPA Pilot Magazine - August 2021 - 95
AOPA Pilot Magazine - August 2021 - 96
AOPA Pilot Magazine - August 2021 - 97
AOPA Pilot Magazine - August 2021 - 98
AOPA Pilot Magazine - August 2021 - 99
AOPA Pilot Magazine - August 2021 - 100
AOPA Pilot Magazine - August 2021 - 101
AOPA Pilot Magazine - August 2021 - 102
AOPA Pilot Magazine - August 2021 - 103
AOPA Pilot Magazine - August 2021 - 104
AOPA Pilot Magazine - August 2021 - 105
AOPA Pilot Magazine - August 2021 - 106
AOPA Pilot Magazine - August 2021 - 107
AOPA Pilot Magazine - August 2021 - 108
AOPA Pilot Magazine - August 2021 - 109
AOPA Pilot Magazine - August 2021 - 110
AOPA Pilot Magazine - August 2021 - 111
AOPA Pilot Magazine - August 2021 - 112
AOPA Pilot Magazine - August 2021 - Cover3
AOPA Pilot Magazine - August 2021 - Cover4
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