Specifications

SECTION III
INSTRUMENTATION AND AVIONICS
MODEL 560
AMLCD INDICATING INSTRUMENT
Each engine is equipped with the following instruments displayed on the center instrument panel (See
Figure 3-5):
Fan RPM (N
1
)
Inter-Turbine Temperature (ITT)
Turbine RPM (N
2
)
Oil Pressure
Oil Temperature
Fuel Flow
Also shown in addition to the engine instruments are:
Ram Air Temperature (RAT)
Fuel Temperature
Fuel Quantity
The engine instruments are displayed on a two screen active matrix liquid crystal display (AMLCD). On the
left screen, N
1,
ITT, and Oil Pressure are shown with a vertical (tape) indicator format. Also shown are
digital displays of N
1
, ITT, and N
2
. On the right screen, Oil Temperature and Fuel Quantity are shown with
a vertical indicator format. Also shown are digital displays of Fuel Flow, RAT, Fuel Temperature, and Fuel
Quantity.
A reversionary mode is available if a fault is detected. In the reversionary mode, one screen displays all of
the parameters, while the opposite screen is blank. N
1
and ITT are shown with a digital and vertical
indicator format, while all other parameters are shown in digital format only. The N
1
bugs and the IGN
annunciators work the same as in the normal mode.
The reversionary mode is controlled by a rotary switch to the right of the engine instruments, labeled L-
Auto-R. When this switch is in the AUTO position, the reversionary mode is automatically selected if a fault
is detected. If the crew suspects a fault, the reversionary mode can be manually selected by placing the
switch in the L or R position.
The left and right screens are powered through the LH ENG DISPLAY and RH ENG DISPLAY circuit
breakers, on the respective left and right circuit breaker panels. The LH ENG DISPLAY circuit breaker is
on the emergency bus, so when the battery switch is in the EMER position and the generators are offline,
the left screen will change to the reversionary mode and the right screen would then be blank. Oil pressure
and fuel quantity displays will be inoperative on the left screen, since they are powered through separate
circuit breakers which are not on the emergency bus.
The fan RPM (N
1
) and turbine RPM (N
2
) are calibrated in percent from 0 - 115% (100% Fan RPM =
13034 RPM, 100% Turbine RPM = 32700 RPM). The fan and turbine RPM measurements come from
monopoles (magnetic speed sensors) mounted on the applicable engine shaft. The vertical indicator and/or
digits will turn red if 100% (redline) is exceeded. Two cyan N
1
bugs are displayed on both sides of the N
1
vertical indicators, and cyan digits above the vertical indicators show the N
1
bug setting. The bugs are set
with a three position rotary switch to the left of the engine instruments labeled DEC - (off) - INC. At startup
the N
1
bugs are set at 87.5%, and the cyan digits will flash until the switch is used to set the bugs to the
correct N
1
target. Turn the switch to the DEC position to decrease the N
1
bug setting, and to the INC
position to increase the N
1
bug setting.
I 3-10 Configuration AA 56OMB-01