PMDG 737NGX 0.00.17
TUTORIAL #2
For Simulator Use Only DO NOT DUPLICATE 27FEB15 RTM
PRELIMINARY PREFLIGHT
Now that we’ve established electrical power to the aircraft, we can
complete the preliminary tasks to ready the cockpit for our flight.
The 737’s navigation system relies primarily on two identical Inertial
Reference Systems. These use extremely high precision laser gyros
located in the avionics bay under the cockpit to sense the aircraft’s
orientation and motion in 3D space. The FMC uses data from the IRSs to
determine the aircraft’s position. This position is further supplemented by
and checked against data from the airplane’s integrated GPS receivers
and ground-based VOR radial/DME “raw data” during the course of the
flight.
In order for all this magic to take place however, we must align the IRSs.
It is extremely important that the aircraft not move in the slightest during
the alignment process.
On the upper overhead panel, rotate both IRS mode selectors to
the NAV position.
o Verify that the ON DC lights illuminate and then extinguish
and then verify that the ALIGN lights are illuminated.
The ALIGN lights will begin flashing after 30 seconds
meaning the gyros are aligned but no position has been
entered – we will deal with this in a minute when we enter our
current position into the FMC CDU.
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