Magnetic Heading Compensation / Calibration - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

(2) Magnetic Heading Compensation / Calibration

The two (2) Air Data & Attitude Heading Reference System (ADAHRS) units mounted on the
aft equipment shelf provide the other components of the Meggitt Magic EFIS system with
magnetic heading data derived from two flux detectors installed in the leading edge of the
vertical fin. The ADAHRS units should be swung (checked for changes in deviation) whenever
any ADAHRS unit, flux detector, or cabin recirculation blower is changed, and at least once a
year.
Use the following procedure to compensate and calibrate the magnetic heading indication
portion of the Meggitt Magic EFIS installation:
NOTE: Always re-calibrate both the Pilot and Copilot EFIS Systems whenever this procedure
is performed.
(a) Flux Detector Indexing
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PAGE 26
Apr 15/07
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
The aircraft should be configured in the following manner:
Generator/Alternator - ON
Day/Night Switch - DAY
Strobe Lights - ON
Windshield Heat - OFF
Cabin Blower Fan - LOW
CAUTION: THE TEST CABLE P/N 101453-002 IS REQUIRED EQUIPMENT. NO
OTHER TEST CABLE IS AUTHORIZED. SEE FIGURE 6.
Install the ADAHRS interface test cable (Piper P/N 101453-002) between the
ADAHRS and the existing production harness assembly. Verify that the ADAHRS test
cable calibration switch is in the open (off) position.
Initialize the Navigation Display (ND) in the "TEST MODE" by applying power with
the "MNU" button held in the depressed position until the initialization page is
displayed.
Select the ADAHRS interface test page 2 from the Navigation Display (ND) menu
selection. The ADAHRS must be in the "INITIALIZATION" mode for the indexing
procedure.
Place the ADAHRS interface test cable calibration switch in the closed (calibration)
position. Ensure that the heading system flag comes into view on the PFD replacing
the heading scale.
Position the aircraft on the NORTH heading of the compass rose and record the
indicated "MAGHDG" as displayed on the ND. Record both pilot and copilot side
heading indications in Chart 7. (This is the raw data output from the flux values.)
Repeat this step for EAST, SOUTH and WEST headings.
Avionics - ON
Navigation Lights - ON
Pitot Heat - OFF
Air conditioning - ON
Vent Blower - OFF
(PIR-PPS 60189, Rev. D.)
5D20