User Guide

Flight Instruction
251
Flight Instruction
250
Now bring up the APU
control panel. Push the
ANNUN button to test that all
the warning lights illuminate,
then the FIRE button to verify
that the fire warning light and
bell are working right. We’re
ready to start the APU, which
is an automated process. Turn
the APU master switch ON
and push the TURBINE START
button. Watch the gauges as
the top of the panel; you’ll see
the RPM and EGT wind up.
When they’re stable, move
the APU generator switch to
ON; you’ll see the ammeter
showing a load. If you want to
use APU bleed air for cabin
heat or air conditioning, turn
the bleed air switch ON. Now
return to the view of the roof
panel.
Watch the gauges at the top of the panel. Switch the volt-
meter to PE (the essential bus) and verify that you have 28 volts.
The MASTER WARNING flasher will probably be on; push it once
to cancel it. There will still be all kinds of lights on both the main
warning panel and the roof panel. The avionics should be awake,
with all the EFIS displays visible. From here on, we’ll be alternat-
ing our attention between the roof panel, the engine section of the
main instrument panel, and the center pedestal, so there’ll be a
good deal of switching back and forth. At least, since we have the
APU online, we can take our time without worrying about run-
ning down our batteries.
In the roof panel, turn both L and R FUEL PUMP switches
ON. Verify that FUEL 1 and FUEL 2 LO PRESS lights go out. At the
lower right, make sure the L and R MAIN AIR VALVE switches are
OFF, and the MAIN AIR VALVE 1 and 2 lights on the lower
instrument panel are off. Push the START switches for the #1 and
#2 inverters on the AC panel and set the standby inverter to ARM.
The AC voltmeter should indicate 115 volts and all the warning
lights in that area of the panel should extinguish.
What’s particularly helpful is the pair of magenta bars that
appears to “grow” up and down to the left of the airspeed digits
box. This is a “trend vector,” and tells you whether your airspeed
is increasing or decreasing, and how fast. The end of the vector
indicates what your speed will be about ten seconds from now.
The real star of the system is
the EHSI, the lower of the two main
instruments. In its “native” mode,
it’s a standard HSI, but in addition,
you can bring up one or two bear-
ing pointers, adding RMI informa-
tion to the same instrument.
When flying enroute, you may
prefer to put the EHSI into its “arc” mode. Now, instead of show-
ing the whole HSI, it shows only an arc ahead of the airplane.
What’s handy about this is that you can superimpose nav data,
waypoints, and VOR stations on this display.
To the right of each nav display is a smaller multifunction
display, which you can choose to use either as an HSI or RMI. The
large knob at its upper right corner selects the display format,
while the two smaller knobs select the source information to drive
the pointers.
A complete description of the EFIS system fills up a full-size
three-ring binder, and has been simplified for easy use in Fly! I
suggest you play with it, using the display selector panel to the left
of each nav display and the bearing selector panel at the top of
the glareshield to explore its capabilities. You can’t hurt anything
- and if the autopilot is flying the airplane, you’ll be changing only
displays, not what the system is actually following.
STARTUP
It’s very unusual to start a jet of this class
entirely from its internal batteries. If external
power is available, we can use that. Otherwise,
we’ll use the batteries to start the Auxiliary Power
Unit (APU). Begin by verifying that both LP cocks
are ON. Turn the master battery switch, near the
top of the roof panel, ON. Set the DC voltmeter
selector to B1 or B2 and verify you have 24 volts.
RPM, EGT and DC Load
Indicators
APU Panel
Annunciator Test
Button
APU Annunciator
APU Master
Switch
APU Turbine
Starter
Bleed Air Switch
Generator
Fire Indicator/ Test
Button
Fire Extinguisher
Overspeed Test
Button