EFD1000 E5 Dual Electronic Flight Instrument (EFI) Install Manual
DOCUMENT # 900-00041-001
PAGE 156-226
REVISION D
© Copyright 2019 Aspen Avionics Inc.
If the Z2 value does not fall between the Z3 and Z4 range limits then further
investigation is required. The RSM is not seeing the correct vertical component of the
earth’s magnetic field due to magnetic interference near the RSM. Check the RSM area
for ferrous hardware and magnetic interference. Contact an Aspen Avionics Field
Service Engineer if further troubleshooting is required.
If the RSM location is suspected of having magnetic interference a more accurate
check is to level the RSM to the horizon and compare the actual Z (Z2) to the NOAA
value. When level the RSM Z value should be within 0.03 of the NOAA value.
10.5.1.2
Conventional Gear RSM Calibration Procedure
Perform the RSM calibration procedure per Section 10.5.2 with the tail wheel on the
ground. Verify heading accuracy is /- 4º. If the heading accuracy cannot be
brought /- 4º tolerance then try temporarily shimming the rear of the RSM
up. Perform another RSM calibration. If a shim corrects the heading accuracy then
install permanent shim per Section 6.9.12.
In some installations it might not be possible to a/- 4º accuracy during the
RSM calibration with the aircraft tail wheel on the ground. If feasible and necessary,
the RSM calibration can be performed in the aircraft flight attitude (with the aircraft
tail wheel lifted off the ground). Contact Aspen Avionics product support for tail
dragger RSM calibration assistance.
