Avionics News September 2016 - 29

insisted on accomplishing a complete survey, including a
encounters thermal influence outside its design limits. The
preliminary weight and balance. The calculations clearly
effects of cold soak at high altitude also can cause anomalies
indicated the newly equipped aircraft could only fly
undetectable during troubleshooting on the ground.
with full fuel if no passenger was on board. Fortunately,
The concept of the Faraday cage is often not taken
the vintage aircraft was worth far more in the original
into account with the installation of new connectivity
condition, and the doctor recovered much of his investment
and advanced cabin management systems where antenna
and elected to seek qualified guidance to procure a more
utilization can be critical. A cabin credenza typically
suitable machine.
provides areas of unoccupied space providing convenient
Validating the wants and expectations of the aircraft
locations for equipment associated with cabin features.
owner or operator should always be one of the first steps
Many such pieces of aircraft furnishing utilize structure
in the planning process. Just because someone saw it
fabricated using aluminum honeycomb panels.
work at the Consumer Electronics Show in Las Vegas
If a Wi-Fi antenna is contained within this structure,
is not qualifying data to support
the radiated signal may only be
installation in an aircraft.
present within the confines of the
Prior to starting any project,
credenza. Possibly opening or
a complete survey of the
removing a credenza drawer or lid
aircraft is essential and should
will enable passengers to connect
be accomplished by someone
with the cabin wireless, but when
knowledgeable of the airframe
closed the Wi-Fi could become lost
as well as the equipment to be
or degraded. Bulkhead doors also
TO A PREDICTABLE
installed. Having an unanticipated
can be an impediment to wireless
antenna already installed in
signals, meaning a Wi-Fi antenna
PROJECT OUTCOME
a location where a new one
located in an aircraft forward galley
AS WELL AS MEETING
is planned will most always
can work fine for passengers in
THE EXPECTATIONS OF
result in additional engineering
the cabin as long as the bulkhead
accompanied by higher cost and
door is open. If the door contains
THE END USERS.
longer downtime.
a metal composition and is closed
Scanning the exterior is only
after takeoff, those in the back may
part of the objective. Inspecting
not be able to access the aircraft
and assessing the areas where new
wireless LAN. Other concerns
equipment is to be installed is yet another essential step.
with Wi-Fi include stray electric fields within the cabin
Making sure there is adequate available space is obvious.
areas. A preliminary survey using radio frequency sensitive
The gotchas include the suitability of underlying structure
equipment is another justifiable step to ensure a high level of
for supporting the weight and associated G-Forces
reliability. Detecting such a stray field can enable a corrective
connected with the new devices. Will identifiable aircraft
action during the refurbishment rather than discovering the
primary structures such as bulkheads and frames intrude
problem while conducting the system checkout. Another
with the installation? If structure requires modification for
consideration, if a new wireless LAN is included as part of
wire-bundle feedthrough or other alteration, will it require
the work, is possible interference with existing systems. RF
a stress analysis or some formal approval?
evaluations often provide insight for reassigning bands on
What about environmental conditions? Is there adequate
the 802.11 spectrum, which could be required.
airflow to ensure proper ventilation of the boxes? If installed
Yet another part of the planning process includes wired
outside the pressure vessel, will adverse temperatures or
connections as well as interface with other systems. In many
atmospheric pressure influence operation? Susceptibility to
older aircraft, wire routing may be rather unpredictable.
moisture ingress also can be a significant concern that may
Years of modifications and repairs may preclude utilization
preclude installations below galleys or other areas where
of any existing wiring and justify the use of new harnesses.
liquid contaminates can hinder operations. Equipment
A general and cursory examination of existing wire looms
mounted against aircraft skins also can produce undesirable
and routing can often provide a crystal ball experience
effects, such as a machine parked in a hot environment
Continued on following page
with direct sunlight exposure where the mounted device

PLANNING IS
ESSENTIAL

avionics news

*

september

2016

29



Table of Contents for the Digital Edition of Avionics News September 2016

No label
Avionics News September 2016 - Intro
Avionics News September 2016 - No label
Avionics News September 2016 - Cover2
Avionics News September 2016 - 1
Avionics News September 2016 - 2
Avionics News September 2016 - 3
Avionics News September 2016 - 4
Avionics News September 2016 - 5
Avionics News September 2016 - 6
Avionics News September 2016 - 7
Avionics News September 2016 - 8
Avionics News September 2016 - 9
Avionics News September 2016 - 10
Avionics News September 2016 - 11
Avionics News September 2016 - 12
Avionics News September 2016 - 13
Avionics News September 2016 - 14
Avionics News September 2016 - 15
Avionics News September 2016 - 16
Avionics News September 2016 - 17
Avionics News September 2016 - 18
Avionics News September 2016 - 19
Avionics News September 2016 - 20
Avionics News September 2016 - 21
Avionics News September 2016 - 22
Avionics News September 2016 - 23
Avionics News September 2016 - 24
Avionics News September 2016 - 25
Avionics News September 2016 - 26
Avionics News September 2016 - 27
Avionics News September 2016 - 28
Avionics News September 2016 - 29
Avionics News September 2016 - 30
Avionics News September 2016 - 31
Avionics News September 2016 - 32
Avionics News September 2016 - 33
Avionics News September 2016 - 34
Avionics News September 2016 - 35
Avionics News September 2016 - 36
Avionics News September 2016 - 37
Avionics News September 2016 - 38
Avionics News September 2016 - 39
Avionics News September 2016 - 40
Avionics News September 2016 - 41
Avionics News September 2016 - 42
Avionics News September 2016 - 43
Avionics News September 2016 - 44
Avionics News September 2016 - 45
Avionics News September 2016 - 46
Avionics News September 2016 - 47
Avionics News September 2016 - 48
Avionics News September 2016 - 49
Avionics News September 2016 - 50
Avionics News September 2016 - 51
Avionics News September 2016 - 52
Avionics News September 2016 - 53
Avionics News September 2016 - 54
Avionics News September 2016 - 55
Avionics News September 2016 - 56
Avionics News September 2016 - 57
Avionics News September 2016 - 58
Avionics News September 2016 - 59
Avionics News September 2016 - 60
Avionics News September 2016 - 61
Avionics News September 2016 - 62
Avionics News September 2016 - 63
Avionics News September 2016 - 64
Avionics News September 2016 - 65
Avionics News September 2016 - 66
Avionics News September 2016 - 67
Avionics News September 2016 - 68
Avionics News September 2016 - 69
Avionics News September 2016 - 70
Avionics News September 2016 - 71
Avionics News September 2016 - 72
Avionics News September 2016 - 73
Avionics News September 2016 - 74
Avionics News September 2016 - 75
Avionics News September 2016 - 76
Avionics News September 2016 - 77
Avionics News September 2016 - 78
Avionics News September 2016 - 79
Avionics News September 2016 - 80
Avionics News September 2016 - Cover3
Avionics News September 2016 - Cover4
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