EFD1000 E5 Dual Electronic Flight Instrument (EFI) Install Manual
DOCUMENT # 900-00041-001
PAGE 61-226
REVISION D
© Copyright 2019 Aspen Avionics Inc.
6.9
RSM Installation
CAUTION: The RSM is an integral part of the attitude function of the AHRS. A stable and magnetically
quiet location for the RSM is essential for proper AHRS operation.
CAUTION: There are special considerations for mounting the RSM on composite, fabric and
pressurized aircraft. See sections 6.9.5 and 6.9.6.
The RSM includes magnetic flux sensors which is why it is important to locate the RSM as far
away from the cabin and baggage (or “hat rack”) compartment as practical as these areas may
have varying magnetic fields (baggage, passengers, etc.).
The RSM should not be mounted within 18 inches of a VHF Comm antenna, 6 inches of a GPS
or ELT antenna, or within 12 inches of an active traffic antenna or DME antenna.
The RSM should be mounted to a relatively flat surface such that there is less than .030” gap
surrounding the RSM when installed. The RSM must not be mounted to an excessively curved
area that could deform the RSM or aircraft skin.
The RSM must not be mounted within a composite fairing such as a fiberglass wingtip cover,
or vertical fin cover as these do not protect against direct lightning effects.
6.9.1
RSM Internal Mounting
Typically the RSM will be internally mounted within an area of the aircraft fuselage or wing
structure that is magnetically benign. For aluminum aircraft, the RSM may be mounted
anywhere inside the aluminum structure.
For composite or fabric covered aircraft (see Figure 6-12), the RSM must not be mounted
forward of the windscreen, or within 39” of the aft end of the fuselage. It may be mounted
within the wing but no closer than 39” of the wingtip. It must not be mounted within the
horizontal stabilizer, or within the vertical stabilizer. See Figure 6-12.
NOTE: If internally mounting the RSM a mounting plate must be locally fabricated and
approved separately. All mounting instructions for a magnetically quiet location still apply.
6.9.2
RSM Inverted or Bottom Mounting
See Figure 6-13. The–003 version of the RSM is designed for inverted bottom mounting.
This version may be mounted to any magnetically quiet area inside the fuselage or on the
underside of the fuselage. Mounting this RSM to the underside of an aerodynamic
surface, such as the wing or the horizontal stabilizer is not approved.
6.9.3
RSM External Top Mounting
See Figure 6-11. The RSM may be externally mounted if desired. One reason for doing
so is if an upgrade from an EFD1000 E5 to a EFD1000 Pro is being planned for. The Pro
has the options of internal GPS and OAT in the -001 RSM which require an external top
mount.
