EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 32-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
14 If the aircraft is limited to VFR, is there 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.
Table 5.1 – Pre Modification Checklist
5.2 Requirements and Limitations
FAR 23.1311(a)(5) requires that independent secondary instruments be installed (existing
units may be relocated) for Attitude, Altitude, Airspeed, and magnetic direction indicator
“whisky compass” when an Electronic Display (i.e., EFD1000) is used as the primary
instrument.
In accordance with FAA Policy, the secondary attitude indicator requirement of FAR 23.1311
(a)(5) does not always apply to aircraft limited to VFR. See Section 5.2.8, Special
Considerations for Aircraft Limited to VFR.
The existing outside air temperature probe (if installed) and magnetic direction indicator
“whisky compass” may not be removed during the installation of the EFD1000 system.
Pneumatic Standby Instruments
Aircraft with existing pneumatic attitude, altitude, and airspeed instruments may relocate
them as necessary as described in Section 5.2.1. The standby airspeed and altimeter should
be connected to an independent pitot and static line (independent from PFD) whenever
available.
Electric Standby Instruments
Aircraft that are all electric must keep the EFD1000 PFD on an independent power source from
the standby instruments as determined from the flow chart of Figure 5.1. The installer must
verify that the standby instruments are electrically isolated from the PFD through either of the
following two methods:
A) Standby instruments are powered by a dedicated standby battery separate from the
aircraft starter battery. [Note: The EFD1000 internal battery does not qualify as an
independent battery under FAR 23.1353(h)]
B) Dual independent electrical systems (dual alternators and dual batteries) with the PFD
on one system and the standby instruments on the other system.
Removal of pneumatic standby instruments and installation of electric standby instruments is
not authorized by this STC. Separate installation approval would be required.
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