Avionics News July 2018 - 37

On a second tour of the flight deck, the difference finally
they generally cannot be changed should demands on a circuit
emerged: A component missing from the flight deck of the
change.
787 - overhead and side panels stuffed with rows of circuit
The main to adjust for a new level of protection involves
breakers, each panel with dozens of individual breakers
replacing the existing circuit breaker with a new one rated for
connecting various aircraft systems to ship's power, and
the new protection level sought. Simple, but not flexible - and
similar panels overflowing with mechanical switches.
still unable to provide status of a circuit breaker or circuit.
Instead of sticking with old technology - in this case,
Then there's connecting breakers in complex aircraft,
thermally activated mechanical circuit breakers and
requiring long runs of wire to protect the various components
mechanical switches - Boeing's
and systems to which they're
engineers paired the state-of-the-art
connected.
avionics and electrical systems with
In recent years, electronic
SOLID-STATE
BREAKERS
equally modern solid-state circuit
circuit breakers began to replace
STARTED SHOWING UP IN
breakers.
mechanical breakers in a host of
For switching, cursor control
applications - structures and aircraft
EXPERIMENTAL, AMATEURdevices, each with a multifunction
among them. Electronic circuit
BUILT AND LIGHT SPORT
key pad, control systems, and
breakers? They're not brand new,
AIRCRAFT YEARS AGO, THE
components provide for data entry
but still relatively rare.
787 WITH ITS DEBUT IN
for flight plans and systems status.
ECBs allow for less wiring, which
2009, AND ARE MOVING
The electronic controls bring
equates to less weight and wiring
UP INTO BUSINESSmultiple benefits with their multiple
complexity.
TURBINE AIRCRAFT.
functions, and the 787 isn't alone in
ECBs can be programmed to
embracing this technological change.
provide other functions - such as
Remote and solid-state breakers
alerts for tripped breakers, the status
first showed up in Airbus Industries'
of circuits and components under the
massive double-decker airliner, the
protection of ECBs, without adding
A380. Pilatus' new PC-24 business
more wiring.
jet uses D.C. breakers from Astronics
And banks of ECBs themselves
Advanced Electronic Systems,
weigh significantly less than
a division of Washington-based
the same number of mechanical
Astronics Corp., as well as Bell Helicopter's 525.
breakers, their buss bars and wiring connections.
Solid-state breakers started showing up in experimental,
amateur-built and light sport aircraft years ago, the 787 with
ECB sources
its debut in 2009, and are moving up into business-turbine
As recently as March, Astronics Advanced Electronic
aircraft. And the numbers keep growing.
Systems unveiled the latest in its line of ECB and
electronic switching products: CorePower 1448, one of
ECBs: Benefits and functions
the company's CorePower electrical-power distribution
While not brand new, ECBs remain relatively rare. But
systems.
that's changing for all the right reasons.
These products serve both breaker and switching
They do more; they offer greater flexibility, weigh less,
functions for protecting circuits and components. The
reduce wiring complexity - and enhance the role circuit
CorePower 1448 replaces as many as 24 conventional
breakers provide protecting aircraft systems.
thermal-mechanical circuit breakers by providing 24
Planemakers are finding their advantages too good to pass
unidirectional 28-volt DC electronic circuit breakers.
up, particularly with their compatibility with digital panels and
Textron Aviation selected the CorePower 1448 to
controls.
handle electrical-system controls and protections in the
Conventional circuit breakers use heat and magnetic trips to
upcoming Cessna Denali single-engine turboprop and the
disconnect a device or circuit from power. The breaker makers
Continued on following page
set the current trip levels in the manufacturing process, and

AND THE
NUMBERS KEEP
GROWING.

avionics news

*

july

2018

37



Table of Contents for the Digital Edition of Avionics News July 2018

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Avionics News July 2018 - No label
Avionics News July 2018 - Cover1
Avionics News July 2018 - Cover2
Avionics News July 2018 - 1
Avionics News July 2018 - 2
Avionics News July 2018 - 3
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Avionics News July 2018 - Cover3
Avionics News July 2018 - Cover4
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