EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 38-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
5.2.8 Special Considerations for Aircraft Limited to VFR
Relief from the requirement for a secondary attitude reference for VFR aircraft has been
provided in an FAA memorandum dated December 8, 2008, “Certification of Electronic
Displays in Part 23 Aircraft Limited to VFR (Visual Flight Rules) Operations; Project No.
SA9024SC-A, Aspen Avionics, Inc. FAA Approved Model List.” The Policy within this
Memorandum permits exclusion of 23.1311(a)(5) with respect to the requirement for a
secondary attitude indicator for aircraft limited to VFR.
The memorandum also discusses eliminating backup airspeed, heading and altitude,
however this requires additional safety assessment and mitigations that are not
covered in this STC. Only the Policy regarding the elimination of the requirement for a
secondary attitude indicator is addressed in this modification.
It is not intended to use this modification as a means to change the established kinds
of operations authorized (see 14 CFR §23.1525). Changes to the kinds of operations
authorized is beyond the scope of this modification and must be established
separately.
The following requirements must be met in order to install the EFD1000 without a
backup attitude indicator in U.S. registered Part 23 aircraft limited to VFR:
The aircraft should have a placard or equivalent acceptable means, stating “Operation
of This Aircraft is Limited to VFR Only”, or similar phraseology acceptable to the
Administrator, as required by § 23.1525, § 23.1559 and § 91.9. Since the kinds of
operations are limited to VFR, this placard or equivalent acceptable means should
already be in place, but should be verified.
For aircraft limited to VFR, airspeed, altitude, and magnetic compass information must
remain independent of the aircraft’s primary electrical power. This manual provides
means to maintain or establish this independence.
5.3 Conventional Landing Gear “tail dragger” Aircraft
The following precautions are necessary for installations in aircraft with conventional landing
gear, due to the necessity of initializing the EFD1000 in a tail-down position:
• The RSM must be serial number 1301 or above.
• The on ground heading accuracy of the EFD1000 must be within +/-4 degrees. An
RSM shim might be required to meet this tolerance – see Section 6.9.9.
• See Section 10.5.1.1 for a conventional gear specific RSM calibration procedure.
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