January-February 2022 - 29

Bigwood said Excelitas supports all of its
HUDs throughout the lifetime of the aircraft.
HUDs are sent back to its facility for
inspection and test. Excelitas determines
if repair is viable or whether the HUD is
beyond economical repair (BER). In most
instances, the company can maintain/
repair the HUD and re-life the product
getting it back to the user.
" As an OEM, we can re-manufacture
failed or damaged elements, or in some
cases, re-work components to restore their
as-new condition, " he said. " All repaired
HUDs are then fully tested prior to return
to the platform integrator. "
If there is a suspected fault in the avionics
head-up display system, Bigwood said
a team of specialists exchange the LRU to
maintain operation of the aircraft. The
suspect LRU will then go to the airbase or
airline maintenance back shop for further
diagnosis. Using the repair procedures created
with Excelitas expertise, the HUD is
diagnosed and either repaired by fitting
Excelitas-supplied replacement sub-assemblies
or returned to Excelitas as the OEM
where the LRU can refurbished.
Keep an Eye on
Combiner Damager
Bigwood said the most common issues are
damages to the combiner, where if used as
a step for entry and exit to the aircraft, they
can get damaged. Sometimes on commercial
airliners, the combiner is used as a
handle for the pilot to haul themselves out
of their seat. This can cause wear in the
combiner mechanism.
If a combiner is scratched, Bigwood said
it needs to be returned for repair or replacement,
otherwise it can obscure symbology.
Similarly, if the combiner mechanism is
damaged, it needs to be returned to the
OEM for strip down and repair.
" Combiner damage is visible by inspection
and mechanism operation is simple to assess
by exercising the stow and deploy operation, "
he said. " The HUD projector assembly is a
sealed and purged unit, which has a maintenance
schedule. If there is a reduction in
image brightness of the HUD, a re-purge
may be the solution or a replacement of the
display source itself might be necessary. "
If you wear a ring, Kowash said to be careful
working around the combiner to avoid
chipping the glass edges. When deploying
the combiner, let the arm snap into the
detent for repeatable positioning.
" One unique procedure some of our systems
may require when swapping LRUs is
electronic alignment, " he said. " To accurately
provide precision flight information
to pilots, HUDs and EFVS sensors
must be aligned to the outside world with
tight tolerances. When replacing LRUs, it
may sometimes be required to confirm or
recalibrate this alignment using electronic
adjustments. Collins provides detailed
instructions for these procedures. "
AviationPros.com/10133965
www.AviationPros.com 29
http://iceshield.com http://www.AviationPros.com/10133965 http://www.AviationPros.com

January-February 2022

Table of Contents for the Digital Edition of January-February 2022

PUBLISHER’S NOTE
Industry Inspection
Maintain Helicopter Health with HUMS
Rotorcraft Operators Face Disruptions, Groundings as 5G Rollout Continues
Ready, Set, Go
Heads Up on HUDs
A Clear View of Dimmable and Tinted Aircraft Windows
The AMC is Back and Better Than Ever!
FOR THE RECORD
ARSA INSIGHT
GAMA INSIGHT
Eddy Current Flaw Detection
Advertiser’s Index
January-February 2022 - 1
January-February 2022 - 2
January-February 2022 - 3
January-February 2022 - 4
January-February 2022 - PUBLISHER’S NOTE
January-February 2022 - Industry Inspection
January-February 2022 - 7
January-February 2022 - 8
January-February 2022 - 9
January-February 2022 - 10
January-February 2022 - 11
January-February 2022 - Maintain Helicopter Health with HUMS
January-February 2022 - 13
January-February 2022 - 14
January-February 2022 - 15
January-February 2022 - 16
January-February 2022 - 17
January-February 2022 - Rotorcraft Operators Face Disruptions, Groundings as 5G Rollout Continues
January-February 2022 - 19
January-February 2022 - Ready, Set, Go
January-February 2022 - 21
January-February 2022 - 22
January-February 2022 - 23
January-February 2022 - Heads Up on HUDs
January-February 2022 - 25
January-February 2022 - 26
January-February 2022 - 27
January-February 2022 - 28
January-February 2022 - 29
January-February 2022 - A Clear View of Dimmable and Tinted Aircraft Windows
January-February 2022 - 31
January-February 2022 - 32
January-February 2022 - The AMC is Back and Better Than Ever!
January-February 2022 - 34
January-February 2022 - 35
January-February 2022 - 36
January-February 2022 - FOR THE RECORD
January-February 2022 - ARSA INSIGHT
January-February 2022 - GAMA INSIGHT
January-February 2022 - Eddy Current Flaw Detection
January-February 2022 - 41
January-February 2022 - Advertiser’s Index
January-February 2022 - 43
January-February 2022 - 44
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