Scotty DA-42 MPP Rack, Руководство по обслуживанию

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SCOTTY DA-42 MPP Rack
6 Calibration
6.1 Introduction
The SCOTTY IRS Subsystem is required for the antenna pointing. On delivery
of the aircraft, the system is already calibrated; and a
new calibration is
usually not required .
After major changes have been applied to the aircraft, if it was hit by lightning
strike, or if the satellite signal strength is reduced, the IRS data should be
compared to the data of the aircraft’s IRS system.
1. Compare the IRS data shown by the SCOTTY EMSHSD software with
the aircraft’s IRS data. See chapter 4.1 “EMSHSD SW” for details
about the software.
CAUTION: The EMSHSD software shows the true heading, the
aircraft might show the magnetic heading. Depending on the current
location, a magnetic field correction of the magnetic heading must be
added or subtracted to calculate the true heading.
2. In case of doubt, attach the SCOTTY calibration kit and use the IRS
Support software to directly read the IRS data. This method provides
access to the magnetic heading of the IRS system, which can be directly
compared to the aircraft’s magnetic heading. See next chapters for
details.
If the measurements show inaccurate IRS data, the SCOTTY IRS system needs
to be re-calibrated as laid out in this chapter.
Maintenance Manual 25