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89000046-014
KSN 780/8XX/900 AeroNav AML STC Installation Manual for Helicopters
Rev 0
Page 5-2
© Honeywell International Inc. Do not copy without express permission of Honeywell.
b.
If new forward support brackets are fabricated, the fabrication
methods must follow the requirements of either Figure C - 1 or
Figure C - 2, FAA Advisory Circular 43.13-1B, Chapter 4 for general
airframe fabrication criteria, including hole tolerances, edge
distances, rivet spacing, and corrosion protection, and Advisory
Circular 43.13-2B, Chapters 2 and 11 for structural adequacy.
The AeroNav 880/900 should be installed using six #6-32 flat head screws and self locking nuts. The
AeroNav 780/800 should be installed using four #6-32 flat head screws and self locking nuts.
5.2 Equipment Location - Replacement Unit
If the AeroNav XXX is being installed as replacement unit on a previously approved installation, the
existing installation location is acceptable and does not require any changes.
5.3 Angle of Regard
The AeroNav XXX should be mounted in a location where the viewing angle of the display does not
exceed the following angles:
•
From the Left: 45°
•
From the Right: 45
°
•
From the Top: 35°
•
From the Bottom: 35°
5.4 Unit Installation/Removal
The AeroNav XXX should be installed using 3/32-inch hex drive tool. The hex drive is inserted into the
hole in the front bezel.
5.5 Internal Cooling
The AeroNav has several internal fans and heat sinks as part of its basic design. There are exhaust
vents on the left and right sides of the chassis with cut outs in the tray to facilitate venting. The left
and right side of the front bezel have intake louvers to help pull ambient cockpit air through the unit.
While not necessary, if installation flexibility permits, the unit will benefit from these intake and
exhaust vents remaining as clear as feasible.
5.6 External Cooling
The AeroNav XXX does not require external cooling, however, additional cooling may prolong product
life. A 5/8” diameter air fitting is provided in the rear of the AeroNav XXX mounting tray, if forced air
cooling is installed.
AeroNav XXX installations in a tightly packed avionics stack should consider installing an electric
avionics cooling fan. As a minimum, plan to leave space for clear intake and exhaust venting when
able. If a fan is installed, ensure the intake air flow to the fan is not located near the exhaust of other
fans or near other hot equipment.
In the event the system feels excessively hot or if an Overtemp Caution Advisory System message is
presented on the display, there are some diagnostic tools provided in the AeroNav XXX to assist in
finding more optimal cooling installations. In Maintenance Mode, select the “Status” tab along to
bottom edge of the display and then press the “Info” Line Select Key as needed until “Temps” is
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