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4 APU OIL Quantity
APU oil quantity (1.00 indicates full).
OVERHEAD MAINTENANCE PANEL
TR
APU START SOURCE
APU BATTERY
1
APU:
EGT 500 N1 100.0 N2 92.6 OIL QTY 0.50RF
SECONDARY EICAS DISPLAY
1 2
3
4
December 01, 1999
747 Operations Manual
Engines, APU Chapter 7
Engine System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 7.20.1
Introduction
The airplane is powered by four General Electric CF6-80C2-B1F engines. The
engines are rated at 57,900 pounds takeoff thrust each.
The engines are dual rotor axial flow turbofans of high compression and bypass
ratio. The N1 rotor consists of a fan, a low pressure compressor section, and a low
pressure turbine section. The N2 rotor consists of a high pressure compressor
section and a high pressure turbine section. The N1 and N2 rotors are
mechanically independent. The N2 rotor drives the engine accessory gearbox.
Each engine has individual flight deck controls and an electronic engine controller
(EEC). The Thrust levers are positioned by the autothrottle system or by the flight
crew. See Chapter 11, Flight Management, Navigation, Section 40, for a
description of FMC thrust management functions.
Engine Indications
Engine indications display on the engine indication and crew alerting system
(EICAS) display.
Primary Engine Indications
N1 and EGT are primary engine indications and always display on primary
EICAS.
Secondary Engine Indications
N2, fuel flow, oil pressure, oil temperature, oil quantity, and engine vibration are
secondary engine indications and normally display on secondary EICAS. The
secondary engine indications display when:
• selected using the Secondary Engine Display switch (the ENG switch on
the Display Select panel)
• the displays initially receive electrical power
• a Fuel Control switch is moved to CUTOFF in flight
The secondary engine parameters can be cleared by pushing the Secondary Engine
Display switch.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
7.20.2 D6-30151-425
Engines, APU -
Engine System Description
Normal Display Format
Each engine indication consists of a digital indicator and, except for fuel flow and
oil quantity, a moving vertical indicator. The digital readouts display numerical
values while the moving indicators display relative value. The digital indicator for
N1, EGT, N2, and fuel flow is enclosed in a box. The vertical indicator displays
the normal operating range, caution range, and operating limit.
The normal operating range display on the vertical indicator is white. An
indication is white when the engine parameter is in the normal operating range.
Oil pressure and oil temperature indicators have caution ranges displayed by
amber bands. The indication changes color to amber if the parameter reaches the
caution range.
The EGT indicator has a continuous limit displayed by an amber band. The
indication changes color to amber if EGT reaches the continuous limit.
EGT indications are inhibited from changing color to amber during takeoff or
go-around for five minutes after the TO/GA switch is pushed, even though EGT
reaches the continuous limit. The amber color change is inhibited for ten minutes
if one engine fails or is shutdown.
The EGT indicator has a takeoff limit displayed by a red line. The indication
changes color to red if EGT reaches the takeoff limit.
N1, N2, oil pressure, and oil temperature indicators have operating limits
displayed by red lines. The indication changes color to red if the parameter reaches
the operating limits.
An indication changes color back to white when the parameter returns to the
normal operating range. The box enclosing the digital indicator remains red as a
reminder of the exceedance. The red box color can be selectively canceled to white
or recalled to red by pushing the cancel or recall switch on the EICAS Display
Select panel.
The oil quantity indication changes color to magenta if low oil quantity is detected
or if the oil quantity differential is exceeded.
Maximum N1 is displayed by an amber line. The N1 indication does not change
color when maximum N1 is reached. The reference N1 indicator displays the
reference N1 selected by the FMC. The command N1 indicator displays N1 RPM
commanded by Thrust lever position. It equals actual N1 RPM when the engine is
stabilized. The command N1 indicator moves when the Thrust lever moves to
display the new commanded N1.
December 01, 1999
747 Operations Manual
　
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