Flight Training - August 2021 - 45

noise-canceling headset and nicely sealed
door(s) may have masked the noise of
increasing and decreasing airspeed. Other
clues such as concurrent GPS groundspeed
changes and engine temperature
indications would be apparent.
Flying a Cessna P210 with a friend
many years ago brought the most
extreme example of mountain waves I've
ever experienced in my nearly 17,000
hours of flying. Again, I was on the lee
side of the Appalachians flying from
power levers in the Boeing 737 that I
fly. Airbus pilots don't have the luxury
of moving levers as they are left in the
Climb detent. But engine indications
would tell the story.
When the waves really get going
they can overcome airliners as well,
which can lead to high-altitude upsets.
At high altitudes, jets live in a very
narrow airspeed envelope. You could be
10 knots shy of the redline and only 20
knots above stall speed. When the waves
WE CONFIGURED FOR MAXIMUM RATE OF CLIMB: COWL
FLAPS OPEN, FULL THROTTLE, CLIMB RPM, RIGHT RUDDER
TRIM, ALL WHILE LOSING ABOUT 500 FEET PER MINUTE.
Winchester, Virginia, to Asheville, North
Carolina, at 18,000 feet. A cold front had
passed and the winds were blowing out
of the northwest across the peaks and
valleys of the mountains. The incoming
cold air scooped the warm air out of
the valleys and created massive waves
that overcame the P210's abilities. We
received a block altitude clearance of
17,000 feet to FL190 because we could
not maintain altitude.
Boy, did I wish that P210 had auto
trim because on the downside of the
wave, we configured for maximum rate
of climb: cowl flaps open, full throttle,
climb rpm, a fair amount of right rudder
trim, all while pathetically losing about
500 feet per minute. On the other side of
the wave it was the opposite: cowl flaps
closed, low power, cruise rpm, some left
rudder trim, and keep the airspeed out
of the yellow arc, all while climbing 500
feet per minute. Despite the waves and
exhausting piloting duties, the ride was
perfectly smooth.
At the airline, waves aren't too
much of an issue when flying around
the Appalachians. We are usually above
them. The Rocky Mountains, however,
are another story. The Rockies create
waves that reach well to and above
our cruising altitudes. Since we have
autothrottles, the first sign of entering
wave conditions is movement of the
get going you can see how this can be
a problem. To solve it, when waves are
forecast, we cruise at a lower altitude,
which expands our airspeed operating
window.
During the downdraft portion of the
wave, power may be set to the maximum
yet airspeed still decreases. In
the updrafts, power comes way back to
maintain airspeed, but be careful not to
pull off too much. At high altitudes, jet
engines are extremely slow to spool up
and pulling off too much power could
lead to disaster when you fly into the next
downdraft and the power hasn't come
back. In these cases, it's more appropriate
to use the speedbrake (spoilers) during
the updrafts to control airspeed rather
than pulling off a lot of power. It may
sound counter-intuitive but it works by
keeping the engines spooled and ready
for the next downslope.
Savvy mountain fliers are well aware
that waves are a serious threat to safety
and know that when the winds are strong
at altitude, there's a near-100-percent
chance of wave activity that could prevent
safe flight of light airplanes. Jets are
better equipped to handle the waves, but
they still create serious operational challenges
that command respect. FT
PETER A. BEDELL is a pilot for a major airline and
co-owner of a Cessna 172 and Beechcraft Baron.
AOPA.ORG/FT
45
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REDEMPTION IS APPLIED AS A STATEMENT CREDIT.
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*Certain points and purchases restrictions apply, see full Rewards Terms
and Conditions for full details at AOPA.org/creditcard.
1. Rewards points can be redeemed for Cash Back or other items provided
through AOPA Pilot Rewards. A Cash Back redemption is applied
as a statement credit. The statement credit will reduce your balance but
you are still required to make at least your minimum payment. A minimum
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back redemption items such as merchandise, gift cards, and travel may
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Sporty's® Pilot Shop. The listed AOPA partners are in no way affiliated
with Commerce Bank, nor are the listed merchants to be considered
sponsors or co-sponsors of this program. Use of merchant names and/or
logos is by the permission of each respective merchant and all trademarks
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= 3%) for every $1 of Net Merchandise Purchases made at select AOPA
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+ 3 bonus points = 4%) for every $1 of Net Merchandise Purchases on
select AOPA purchases, 3% Cash Back (1 regular point + 2 bonus points
http://www.AOPA.org/creditcard http://www.AOPA.org/creditcard http://www.AOPA.ORG/FT

Flight Training - August 2021

Table of Contents for the Digital Edition of Flight Training - August 2021

Contents
Flight Training - August 2021 - Intro
Flight Training - August 2021 - Cover1
Flight Training - August 2021 - Cover2
Flight Training - August 2021 - Contents
Flight Training - August 2021 - 2
Flight Training - August 2021 - 3
Flight Training - August 2021 - 4
Flight Training - August 2021 - 5
Flight Training - August 2021 - 6
Flight Training - August 2021 - 7
Flight Training - August 2021 - 8
Flight Training - August 2021 - 9
Flight Training - August 2021 - 10
Flight Training - August 2021 - 11
Flight Training - August 2021 - 12
Flight Training - August 2021 - 13
Flight Training - August 2021 - 14
Flight Training - August 2021 - 15
Flight Training - August 2021 - 16
Flight Training - August 2021 - 17
Flight Training - August 2021 - 18
Flight Training - August 2021 - 19
Flight Training - August 2021 - 20
Flight Training - August 2021 - 21
Flight Training - August 2021 - 22
Flight Training - August 2021 - 23
Flight Training - August 2021 - 24
Flight Training - August 2021 - 25
Flight Training - August 2021 - 26
Flight Training - August 2021 - 27
Flight Training - August 2021 - 28
Flight Training - August 2021 - 29
Flight Training - August 2021 - 30
Flight Training - August 2021 - 31
Flight Training - August 2021 - 32
Flight Training - August 2021 - 33
Flight Training - August 2021 - 34
Flight Training - August 2021 - 35
Flight Training - August 2021 - 36
Flight Training - August 2021 - 37
Flight Training - August 2021 - 38
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Flight Training - August 2021 - 40
Flight Training - August 2021 - 41
Flight Training - August 2021 - 42
Flight Training - August 2021 - 43
Flight Training - August 2021 - 44
Flight Training - August 2021 - 45
Flight Training - August 2021 - 46
Flight Training - August 2021 - 47
Flight Training - August 2021 - 48
Flight Training - August 2021 - 49
Flight Training - August 2021 - 50
Flight Training - August 2021 - 51
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Flight Training - August 2021 - 55
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Flight Training - August 2021 - Cover3
Flight Training - August 2021 - Cover4
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