AOPA Pilot Magazine - January 2020 - 80
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P&E
TECHNIQUE
But, human nature has a lazy streak. It's
easy when departing Big Town Municipal's
5,500-foot runway for the 517th time to
check the wind before choosing a departure runway, then just push in the throttle
and go. But, can that pilot look down a mile
of pavement and point out to a nervous passenger where, exactly, the wheels will leave
the ground?
Calculate the predicted ground roll from
the aircraft pilot's operating handbook for
a practice day's wind, density altitude, and
aircraft weight. Then, locate that point on
the runway, or on the airport plan view.
Note an object, runway stripe, or bush
nearby. Next, try some takeoffs. Each time,
estimate the lift-off point from the cockpit.
The goal is to eventually learn how to predict where the wheels will leave the ground
from any runway, at any weight, in any wind.
RULES OF THUMB
Plan to lift off within 70 percent
of the available runway surface
Example: At a field elevation
of 2,000 feet and 30 degrees
Celsius (88 degrees Fahrenheit)
air temperature, a gross weight
Cessna 182Q needs 930 feet
to break ground. That means
choosing a runway at least 1,329
feet long.
2. WHERE'S THE ABORT POINT?
The single-engine takeoff abort point is
where the pilot can chop the power to
idle, apply maximum braking, and then
stop on the prepared surface. It allows
the pilot to discontinue the takeoff, taxi
back, and investigate without damaging
the airplane or hurting its occupants. It
costs nothing but time.
Professional pilots are primed to abort
if anything doesn't look right, feel right,
smell right, or sound right. Engine failure is the obvious motive, but many other
events can, and should, trigger the same
action: low power, strange noise, oil on the
windshield, not reaching target airspeed,
flaps not set, trim not set, grass too high,
surface too soft, parking brake left on,
cargo or cabin door pops open.
80 | AOPA PILOT January 2020
RULES OF THUMB
(Some of these vary depending
upon engine horsepower and
braking effectiveness. Test your
airplane's actual performance
and always build a buffer into
numbers listed in the pilot's
operating handbook.)
* The aircraft should attain 70
percent of liftoff speed by 50
percent of the distance to liftoff
point.
* Normal pilots in single-engine,
piston aircraft waste about 500
feet between the "surprise" and
reacting. Include that additional
distance when choosing an abort
point.
* The abort point is never past a
level strip's 50 percent marker.
* The distance to stop on a level
surface after the abort point
equals the distance used to
reach the abort point.
* Downslope abort points are
difficult to judge and dangerous
to practice. The aircraft is committed as soon as it moves.
* For the same aircraft and
runway, the abort point will
change with gross weight, density altitude, wind, and surface
condition.
Executing a successful takeoff abort is
a maximum performance maneuver. When
reaching the abort point the pilot must
decide to continue or stop. No waffling.
3. CAN THE OBSTACLES BE CLEARED?
For many pilots, obstacle clearance
remains an academic concept. They grow
accustomed to the margins built into a
robust civil aviation environment. But
operating from a more limited backcountry or private strip, theory can quickly
morph into hard reality. Their own
unrealized assumptions, along with the
airstrip's unnoticed details, can make the
difference between a fun day and seriously
scratching the paint.
A pilot should already know her airplane's best angle of climb speed (VX).
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AOPA Pilot Magazine - January 2020
Table of Contents for the Digital Edition of AOPA Pilot Magazine - January 2020
Contents
AOPA Pilot Magazine - January 2020 - Intro
AOPA Pilot Magazine - January 2020 - BB1
AOPA Pilot Magazine - January 2020 - BB2
AOPA Pilot Magazine - January 2020 - Cover1
AOPA Pilot Magazine - January 2020 - Cover2
AOPA Pilot Magazine - January 2020 - Contents
AOPA Pilot Magazine - January 2020 - 2
AOPA Pilot Magazine - January 2020 - 3
AOPA Pilot Magazine - January 2020 - 4
AOPA Pilot Magazine - January 2020 - 5
AOPA Pilot Magazine - January 2020 - 6
AOPA Pilot Magazine - January 2020 - 7
AOPA Pilot Magazine - January 2020 - 8
AOPA Pilot Magazine - January 2020 - 9
AOPA Pilot Magazine - January 2020 - 10
AOPA Pilot Magazine - January 2020 - 11
AOPA Pilot Magazine - January 2020 - 12
AOPA Pilot Magazine - January 2020 - 13
AOPA Pilot Magazine - January 2020 - 14
AOPA Pilot Magazine - January 2020 - 15
AOPA Pilot Magazine - January 2020 - 16
AOPA Pilot Magazine - January 2020 - 17
AOPA Pilot Magazine - January 2020 - 18
AOPA Pilot Magazine - January 2020 - 19
AOPA Pilot Magazine - January 2020 - 20
AOPA Pilot Magazine - January 2020 - 21
AOPA Pilot Magazine - January 2020 - 22
AOPA Pilot Magazine - January 2020 - 23
AOPA Pilot Magazine - January 2020 - 24
AOPA Pilot Magazine - January 2020 - 25
AOPA Pilot Magazine - January 2020 - 26
AOPA Pilot Magazine - January 2020 - 27
AOPA Pilot Magazine - January 2020 - 28
AOPA Pilot Magazine - January 2020 - 29
AOPA Pilot Magazine - January 2020 - 30
AOPA Pilot Magazine - January 2020 - 31
AOPA Pilot Magazine - January 2020 - 32
AOPA Pilot Magazine - January 2020 - 33
AOPA Pilot Magazine - January 2020 - 34
AOPA Pilot Magazine - January 2020 - 35
AOPA Pilot Magazine - January 2020 - 36
AOPA Pilot Magazine - January 2020 - 37
AOPA Pilot Magazine - January 2020 - 38
AOPA Pilot Magazine - January 2020 - 39
AOPA Pilot Magazine - January 2020 - 40
AOPA Pilot Magazine - January 2020 - 41
AOPA Pilot Magazine - January 2020 - 42
AOPA Pilot Magazine - January 2020 - 43
AOPA Pilot Magazine - January 2020 - 44
AOPA Pilot Magazine - January 2020 - 45
AOPA Pilot Magazine - January 2020 - 46
AOPA Pilot Magazine - January 2020 - 47
AOPA Pilot Magazine - January 2020 - 48
AOPA Pilot Magazine - January 2020 - 49
AOPA Pilot Magazine - January 2020 - 50
AOPA Pilot Magazine - January 2020 - 51
AOPA Pilot Magazine - January 2020 - 52
AOPA Pilot Magazine - January 2020 - 53
AOPA Pilot Magazine - January 2020 - 54
AOPA Pilot Magazine - January 2020 - 55
AOPA Pilot Magazine - January 2020 - 56
AOPA Pilot Magazine - January 2020 - 57
AOPA Pilot Magazine - January 2020 - 58
AOPA Pilot Magazine - January 2020 - 59
AOPA Pilot Magazine - January 2020 - 60
AOPA Pilot Magazine - January 2020 - 61
AOPA Pilot Magazine - January 2020 - 62
AOPA Pilot Magazine - January 2020 - 63
AOPA Pilot Magazine - January 2020 - 64
AOPA Pilot Magazine - January 2020 - 65
AOPA Pilot Magazine - January 2020 - 66
AOPA Pilot Magazine - January 2020 - 67
AOPA Pilot Magazine - January 2020 - 68
AOPA Pilot Magazine - January 2020 - 69
AOPA Pilot Magazine - January 2020 - 70
AOPA Pilot Magazine - January 2020 - 71
AOPA Pilot Magazine - January 2020 - 72
AOPA Pilot Magazine - January 2020 - 73
AOPA Pilot Magazine - January 2020 - 74
AOPA Pilot Magazine - January 2020 - 75
AOPA Pilot Magazine - January 2020 - 76
AOPA Pilot Magazine - January 2020 - 77
AOPA Pilot Magazine - January 2020 - 78
AOPA Pilot Magazine - January 2020 - 79
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AOPA Pilot Magazine - January 2020 - 100
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AOPA Pilot Magazine - January 2020 - 111
AOPA Pilot Magazine - January 2020 - 112
AOPA Pilot Magazine - January 2020 - Cover3
AOPA Pilot Magazine - January 2020 - Cover4
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