Advanced AF-5000, Installation Manual

Page: 31 / 267

Version 16.10
AF-6600 AF-5000 Series Install Manual
31
ADAHRS-200/201 MAG-236 Magnetic Heading Calibration
AFS calibrates every ADAHRS during manufacture, however a separate calibration is
required to accurately measure magnetic heading in an aircraft installation. The
calibration procedure in this section simultaneously calibrates every SV-ADAHRS-
20X in the Advanced-SV network.
Magnetic heading calibration requires pointing the aircraft in four directions and acquiring data at each
direction.
The aircraft’s configuration and major systems should be in a state that resembles flight
conditions during calibration (i.e., the canopy should be closed , the aircraft’s pitch attitude matches
AF- 5000’s attitude depiction, the engine should be running, and all electronic devices should be on).
An accurate method of aligning the aircraft with magnetic North, East, South, and West, such as an
airport’s compass rose, is required.
Tail wheel equipped aircraft can be calibrated in their normal nose up ground attitude
as long as the AF-5000 attitude display shows the correct corresponding nose up
attitude.
A working GPS receiver must be connected to the AF-5000 system in order to calibrate
magnetic heading. The AF-5000 uses GPS-derived position information to calculate
magnetic intensity, declination, and variation.
It is important to calibrate magnetic heading in an area that has been verified to be
magnetically neutral. The presence of steel reinforcement (rebar), electrical power
lines under the tarmac, or other natural deposits of ferrous metals can result in an
inaccurate compass calibration. Airport compass roses are usually verified to be
magnetically neutral. For more information on this issue see FAA Notice Number:
NOTC4031:
https://www.faasafety.gov/files/notices/2012/Aug/CAUTION_TLP_031612_Rev10.pdf
Procedure
1. Move the Aircraft to open area on Asphalt
2. Turn on all EFIS screens in the aircraft and wait for the Attitude Indeterminate Red X to go away.
3. Select MAG cal on the PFD EFIS from the following menu: [SET] -> [AHRS] -> [MAG CAL]
HOLD Button for 2 seconds
4. After accessing the MAG Align menu press the [START] button and follow the on-screen directions.