EFD1000 E5 Dual Electronic Flight Instrument (EFI) Install Manual
DOCUMENT # 900-00041-001 PAGE 75-226 REVISION D
© Copyright 2019 Aspen Avionics Inc.
Figure 6-26: ACU/ACU2 Mount to Flat Metal Shelf
6.10.1 ACU/ACU2 Mounting
Mount the ACU to existing shelf in any orientation using six (6) MS35206 #8-32 screws,
six (6) NAS1149FN832P washers, and six (6) MS21044N08 #8-32 self-locking nuts.
Tighten nuts to 12 in-lbs.
Installation of the ACU/ACU2 must be in accordance with AC43.13-2B, Chapter1
Paragraphs 100 to 114, pages 1 to 8. An unpainted surface of the ACU case must be
bonded to aircraft ground either through mounting to a metal shelf or with an installer
fabricated bonding strap of wire braid or single stranded wire no more than 12 inches in
length. Attach ground lug of bonding strap to one of the mounting screws if required.
Refer to AC 43.13-1B paragraphs 11-187 to 11-190, pages 11-73 to 11-79 for
additional bonding information.
Verify ACU case to airframe ground has ≤ 3 milliohms of resistance.
Should a shelf or bracket need to be fabricated in order to install the ACU it is beyond the
scope of this STC and will require separate FAA approval for that modification.
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