Avionics News October 57-10 - 49

for everything from anti-collision and wingtip position
however, that aircraft experience in a typical day's use.
lights, landing and taxi lights. LEDs can be excellent
Unarguably, summers provide jet aviation with its
for saving weight, reducing current draw and long lives,
most dramatic temperature swings through the course
reducing maintenance needs. But nowhere in aviation do
of an otherwise routine flight. The aircraft experiences
a temperature swing from the oven-roasting heat of a
we see more progress than in our avionics stacks. Digital
120-degree airport ramp to a minus 60 degrees or colder
electronics long ago started supplanting transistor-based
in the bone-chilling-cold-soaking at Flight Level 510 -
electronics, which replaced radios using tubes.
Within the transition to electronic displays, the
and back again at landing.
Less severe are the temperature swings experienced
industry first moved to cathode ray tubes for displays
by aircraft typical of the pistonbefore advancing into liquid-crystal
powered set. Normally aspirated
and LED displays.
piston-powered aircraft rarely fly
"Something you should never
at altitudes where summertime
experience flying your aircraft
COLD CAUSES FEW
temperatures fall to the same
is the grinding sound of a failing
PROBLEMS FOR MODERN
degree. It may be 120 on the
attitude indicator approaching
DIGITAL ELECTRONICS
ramp, but at typical cruising
failure because of worn bearings
COMPARED TO THE
altitudes, temperatures still remain
- the source of the sound," the
ELECTRONICS USED 30
comfortably above freezing.
veteran explained to the rookie.
YEARS AGO AND MORE,
But inside the heat-soaked
The rookie seemed puzzled. "You
ACCORDING TO INPUT
cabin during summer, avionics
mean my primary fight display
FROM SEVERAL AVIONICS
temperatures easily reach into triple
has bearings?" The rookie's voice
MAKERS. HEAT, HOWEVER,
digits. In the winter, avionics in a
reflected his incredulity. The
IS AN ENEMY OF
cold-soaked cabin may fall well
rookie never flew even a trainer
ELECTRONICS IN GENERAL
below freezing levels until power
with analog flight instruments
- AND MORE SO FOR
starts to warm the electronics.
with spinning-mass gyroscopic
THE
FINE
CONNECTIONS
So extreme temperature swings
instruments for attitude, turn
EMBEDDED IN THE TINY
should be considered a routine
indication or gyro compass;
DIGITAL CIRCUITRY
part of flying any time of year.
electronics were all he's flown.
INSIDE CHIPS.
Dealing with this reality can
A fact which prompted a series
help the avionics reach operating
of hangar-flying tales of failed
temperatures more quickly and help
directional gyros and attitude
reduce any delay from waiting on
indicators - typically prefaced with
display screens to fully warm and reach their optimal
the warning signs of failing bearings grinding themselves
operating temperature range, with more-responsive,
into seizure.
Cold weather, the veteran explained, taxed the
more-colorful displays happening sooner.
Certificated avionics endure testing to establish their
bearings most, as the air pump strained to bring those
operating-temperature ranges - data published in the
spinning-mass gyroscopes up to a functional speed.
"In the summertime," the veteran pilot added, "the
documents accompanying them from their respective
sound of failing bearings is even more pronounced
factories. Consider these conditions for dealing with
thanks to the higher temperatures."
temperature extremes in the care and feeding of aircraft
Temperature-sensitive bearings may not be an
avionics.
issue for digital flight instruments using MEMS -
microelectromechanical sensors. But temperature
A spin around the past
extremes can still impact the operation of glass cockpits,
A friend and fellow aviator recently regaled a novice
indicators, switches, relays and batteries when cold
pilot about the advances in aviation over the past three
affects the tiny sensors.
decades.
Composite airframes; digital engine controls;
Continued on following page
airframe-recovery parachutes; and light-emitting diodes
AVIONICS NEWS

*

OCTOBER

2020

49



Avionics News October 57-10

Table of Contents for the Digital Edition of Avionics News October 57-10

No label
Avionics News October 57-10 - Intro
Avionics News October 57-10 - No label
Avionics News October 57-10 - Cover2
Avionics News October 57-10 - 1
Avionics News October 57-10 - 2
Avionics News October 57-10 - 3
Avionics News October 57-10 - 4
Avionics News October 57-10 - 5
Avionics News October 57-10 - 6
Avionics News October 57-10 - 7
Avionics News October 57-10 - 8
Avionics News October 57-10 - 9
Avionics News October 57-10 - 10
Avionics News October 57-10 - 11
Avionics News October 57-10 - 12
Avionics News October 57-10 - 13
Avionics News October 57-10 - 14
Avionics News October 57-10 - 15
Avionics News October 57-10 - 16
Avionics News October 57-10 - 17
Avionics News October 57-10 - 18
Avionics News October 57-10 - 19
Avionics News October 57-10 - 20
Avionics News October 57-10 - 21
Avionics News October 57-10 - 22
Avionics News October 57-10 - 23
Avionics News October 57-10 - 24
Avionics News October 57-10 - 25
Avionics News October 57-10 - 26
Avionics News October 57-10 - 27
Avionics News October 57-10 - 28
Avionics News October 57-10 - 29
Avionics News October 57-10 - 30
Avionics News October 57-10 - 31
Avionics News October 57-10 - 32
Avionics News October 57-10 - 33
Avionics News October 57-10 - 34
Avionics News October 57-10 - 35
Avionics News October 57-10 - 36
Avionics News October 57-10 - 37
Avionics News October 57-10 - 38
Avionics News October 57-10 - 39
Avionics News October 57-10 - 40
Avionics News October 57-10 - 41
Avionics News October 57-10 - 42
Avionics News October 57-10 - 43
Avionics News October 57-10 - 44
Avionics News October 57-10 - 45
Avionics News October 57-10 - 46
Avionics News October 57-10 - 47
Avionics News October 57-10 - 48
Avionics News October 57-10 - 49
Avionics News October 57-10 - 50
Avionics News October 57-10 - 51
Avionics News October 57-10 - 52
Avionics News October 57-10 - 53
Avionics News October 57-10 - 54
Avionics News October 57-10 - 55
Avionics News October 57-10 - 56
Avionics News October 57-10 - 57
Avionics News October 57-10 - 58
Avionics News October 57-10 - 59
Avionics News October 57-10 - 60
Avionics News October 57-10 - 61
Avionics News October 57-10 - 62
Avionics News October 57-10 - 63
Avionics News October 57-10 - 64
Avionics News October 57-10 - Cover3
Avionics News October 57-10 - Cover4
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https://www.nxtbook.com/allen/avne/50-11
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