Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 976 / 1956

PAGE 30
Feb 28/07
5E10
34-20-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
(2) Optional Meggitt EFIS Installation
(PIR-PPS 60189-1, Rev. New.)
The Air Data & Attitude Heading Reference System (ADAHRS) unit mounted on the aft
equipment shelf provides the other components of the Meggitt Magic EFIS system with
magnetic heading data derived from the flux detector installed in the leading edge of the
vertical fin. The ADAHRS unit should be swung (checked for changes in deviation) whenever
the ADAHRS unit, flux detector, or either 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:
(a) Setup
1 Level the airplane within ± 1 degree laterally and longitudinally at the top surface of
the seat rails.
2 Configure the airplane as follows:
External Power Applied to Aircraft Avionics - ON
Instrument Panel Lights - Full Bright LCD Displays - Full Bright
Day/Night Switch - Day Navigation Lights - ON
Strobe Lights - ON Pitot Heat - OFF
Windshield Heat - OFF Air conditioning - OFF
Cabin Blower Fan - Low Vent Blower - OFF
(b) ADAHRS Unit Alignment Procedure
1 Place the EHSI in the "TEST MODE" by applying power with the "MNU" button held
in the depressed position until the initialization page is displayed.
2 Select ADAHRS test page 2 from the EHSI menu selections.
3 Allow the ADAHRS to complete the initialization period and display an attitude
sphere on the EADI.
4 Verify that the pitch and roll errors, as displayed on the EHSI test page, are less than
± 0.5 degrees in either axis.
5 If required for ADAHRS leveling, install shims under the ADAHRS mounting feet and
re-secure the unit to the mounting structure.
6 Repeat the alignment procedure until the minimum acceptable criteria is met.
(c) Compass System Calibration Procedure
1 Flux Detector Indexing
CAUTION: THE TEST CABLE P/N 101453-002 IS REQUIRED EQUIPMENT. NO
OTHER TEST CABLE IS AUTHORIZED. SEE FIGURE 4.
a Install the ADAHRS test cable and verify that the ADAHRS test cable calibration
switch is in the "NORMAL" (open) position.
b Place the EHSI in the "TEST MODE" by applying power with the "MNU" button
held in the depressed position until the initialization page is displayed.
c 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.