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Pull (Autostart switch ON) –
• arms start valve
• opens engine bleed air valve
Pull (Autostart switch OFF)–
• opens start valve
• opens engine bleed air valve
Releases at 50% N2 RPM -
• start valve closes
• engine bleed air valve closes
2 Standby (STBY) IGNITION Selector
NORM –
• AC power system supplies power to selected igniter
• standby power system supplies power continuously to both igniters if AC
power system is not powered
1 or 2 - standby power system supplies power continuously to related igniter.
3 Continuous (CONT) IGNITION Switch
ON –
• selected igniter operates continuously
• commands approach idle minimum
OVERHEAD PANEL
AUTOSTART
ON
SINGLE
BOTH
1 START
1 2
CON
STBY IGNITION AUTO
2 3 4
ON
NORM
1 5
2
3
6
4
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747 Operations Manual
Copyright © The Boeing Company. See title page for details.
7.13.4 D6-30151-425
Engines, APU -
Engine Controls
4 AUTO IGNITION Selector
SINGLE -
• EEC alternates igniter 1 and igniter 2 for each ground start
• EEC selects both igniters for in-flight start or flameout
BOTH - selects both igniters.
Selected igniter operates when any of the following occur:
• during start when N2 RPM less than 50%
• trailing edge flaps out of up position
• nacelle anti-ice ON
• engine flameout
5 Engine Start Lights
Illuminated (white) – start valve is open.
6 AUTOSTART Switch
ON – arms the autostart system.
OFF –
• autostart system is disabled
• start is manually controlled
Electronic Engine Control
Electronic Engine Control Panel
1
ALTN
NORM
2
ALTN
NORM
3
ALTN
NORM
4
ALTN
NORM
ELEC ENG CONTROL
OVERHEAD PANEL
1
2
December 01, 1999
747 Operations Manual
Engines, APU -
Engine Controls
Copyright © The Boeing Company. See title page for details.
D6-30151-425 7.13.5
1 Electronic (ELEC) Engine (ENG) CONTROL Switches
NORM (Normal) –
• selects normal engine control mode
• electronic engine control sets thrust using N1 RPM as the controlling
parameter
Alternate -
• selects alternate engine control mode
• thrust set using N1 RPM as controlling parameter
2 EEC Alternate (ALTN) Lights
Illuminated (amber) - alternate engine control mode selected.
Electronic Engine Control Maintenance Panel
1 EEC Maintenance (MAINT) POWER Switches
Normal (NORM) – supplies electrical power for normal EEC operation.
TEST - supplies electrical power for EEC maintenance testing when engine not
running.
NORM
TEST
EEC MAINT
ENG 1 ENG 2 ENG 3 ENG 4
POWER POWER POWER POWER
OVERHEAD MAINTENANCE PANEL
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
7.13.6 D6-30151-425
Engines, APU -
Engine Controls
Intentionally
Blank
April 1, 2000
747 Operations Manual
Engines, APU Chapter 7
APU Controls and Indications Section 14
Copyright © The Boeing Company. See title page for details.
D6-30151-425 7.14.1
APU Controls and Indications
APU Selector
1 APU Selector
OFF –
• closes APU bleed air isolation valve
• initiates normal shutdown
• resets auto shutdown fault logic except when shutdown due to APU bleed
duct leak
ON (APU operating position) –
• opens APU fuel valve and inlet door
• arms APU bleed air isolation valve
• activates DC or AC fuel pump
START (momentary position, spring–loaded to ON) – initiates automatic start
sequence.
APU
ON
OFF START
1
OVERHEAD PANEL
April 1, 2000
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
7.14.2 D6-30151-425
Engines, APU -
APU Controls and Indications
APU Start Source
1 APU START SOURCE
TR - normal switch position. Selects TR or APU battery for start (except when TR
fails).
APU BATTERY - selects APU battery power for APU starting. Removes TR from
APU starting circuit.
APU Indications
1 EGT
APU exhaust gas temperature.
2 RPM
APU rotation speeds in percent.
3 Refill (RF)/Low (LO)
Displayed RF or LO (magenta) - oil quantity below prescribed level.
　
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