EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 48-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
6.8.3 Mounting Bracket Installation
The pre-drilled holes in the mounting bracket (see Figure 6.4) support both standard
3” round instrument holes, and 3ATI square cutouts. The bracket is centered on the
upper instrument hole. The lower portion of the bracket is provisioned with screw
slots, allowing variable vertical spacing configurations.
If the lower cutout is a 3ATI or other larger standard cutout, a commercially available
metal blanking plate should be used to flush fill the cutout. Use the PFD Mounting
Bracket as a template to cut the 2.10” diameter cutout for the fan and two 0.150”
diameter mounting holes. All cut edges should be treated to prevent corrosion.
The PFD is attached to the instrument panel in 6 places with MS24693-S30 (#6-32
flathead screws), NAS1149FN632P (washers), and MS21044N06 (#6-32 Nuts). It is also
acceptable to use existing #6 nut plates or equivalent.
1) Burnish the back of the instrument panel around one of the 6 mounting holes to
allow for bracket to instrument panel bonding through the screw/washer/nut.
2) Loosely install the bracket with the upper two mounting screws/nuts/washers as
shown in Figure 6.3.
3) Use an inclinometer on the top of the PFD bracket with the aircraft level to make
this adjustment. It may be necessary to slot the existing holes to align the bracket
in the roll axis.
4) The PFD must be mounted within 0.0±0.1º of the zero degree roll “wings level”
axis.
5) Fabricate an 8” bonding strap from braid and two ground lugs. Attach one ground
lug to a mounting screw on the backside of the panel (see Figure 6.2).
6) Install remaining PFD mounting bracket screws and nuts.
7) Tighten all six (6) mounting screws and nuts to 12 in-lbs anchoring the bracket to
the panel.
Aircraft with tilted instrument panels of 8º or less can install the PFD flat against the
panel. The tilt will later be removed electronically in the system configuration using
the Pitch Attitude Trim adjustment.
6.8.4 PFD Bonding Strap
An 8” or shorter braided bonding strap is required between the screw (below and left
of the static port- see Figure 6.2) on the backside of the PFD to a location on the
backside of the instrument panel using one of the mounting screws and nuts. Verify
less than 3 milliohms resistance to airframe ground at bonding strap connection point.
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