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Honeywell
MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
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160
D1-3 Aerospace Optics
Aerospace Optics Inc.
Aerospace Optics Inc. is pleased to support the Honeywell EGPWS/TAWS team
with our line of Vivisun LED lighted switches and indicators. We would welcome
the opportunity to assist with your installation and address your Honeywell
EGPWS/TAWS lighting requirements.
LED Lighting
The Honeywell EGPWS/TAWS systems offer state-of-the-art performance.
Accordingly, several recent innovations in LED cockpit lighting have emerged
which truly complement the performance of the Honeywell Systems.
Traditionally, lighted cockpit switches have used incandescent lamps which are
known for the excessive face cap temperatures they generate. The lamps are
also subject to high failure rates which degrades sunlight readability and creates
reliability concerns. LED lighting resolves each of these limitations as they
consume less than half the power of typical incandescent lamps and offer life-of-
the-aircraft reliability. However, the use of LED lighting also has a number of
additional challenges, which can quickly dilute their utility.
When using LED lighting in the past, sunlight readability and viewing angles were
limited and uniform dimming required special pulse width modulation.
Additionally, unprotected LEDs were susceptible to damage from transients and
voltage spikes from severe electrical environments as defined in RTCA/DO-
160D. However, today, with the evolution of LED technology and innovative
design techniques, it is possible to take advantage of the efficiencies afforded by
LEDs while continuing to meet the lighting and environmental requirements of
aircraft design.
The Vivisun LED resolves each of these challenges including DO-160D
compliance and standard voltage controlled dimming. LEDs are the lighting
source for the future and the ideal compliment to the Honeywell EGPWS/TAWS
Systems.