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when the tubes are installed. There are two fuel manifolds on the engine:
the main and pilot fuel manifold. Short tubes, which have union nuts at
each end, connect the manifolds to the fuel spray nozzles.
H. Fuel Nozzles:
Ten fuel spray nozzles supply a continuous spray of atomized fuel particles
to the combustion chambers. Each fuel spray nozzle has two systems that
supply fuel: a pilot system and a main system. The systems operate
independently and give the correct combustion conditions for the full range
of engine operation.
OPERATING MANUAL
2A-73-00 PRODUCTION AIRCRAFT SYSTEMS
Page 2
May 31/01
Revision 4
4. Controls and Indications:
(See Figure 3.)
NOTE:
A detailed description of the Engine Instruments and
Crew Alerting System (EICAS) messages can be
found in Section 5 of Honeywell’s SPZ-8000 (or SPZ-
8400) Digital Automatic Flight Control System Pilot’s
Manual for the Gulfstream IV.
Mounted on the fuel filter housing assembly are the following two pressure
switches:
A. Fuel Pressure Low Warning Switch:
When a low pressure condition occurs, this 15 psi switch will illuminate the
red L-R FUEL PRESS warning indication on the EICAS and/or the Standby
Warning panel.
B. Fuel Filter Differential Pressure Switch:
When the fuel filter becomes obstructed, this 7 psid switch senses the
difference in the fuel pressures upstream and downstream of the filter
element and will illuminate the L-R FUEL FILTER warning indication on the
EICAS and/or the Standby Warning panel.
5. Limitations:
The maximum and minimum engine fuel temperatures are as follows:
• Maximum: 90°C (Fuel temperature up to 120°C for maximum of fifteen (15)
minutes is permissible)
• Minimum: -40°C
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-73-00
Page 3
May 31/01
Revision 4

　
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