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Handling and Servicing Procedures.
3. Controls and Indications:
NOTE:
A description of the Engine Instruments display,
ENGINE START system page and HYDRAULICS
system page can be found in Section 5: Engine
Instruments and Crew Alerting System (EICAS), of
Honeywell’s SPZ-8000 (or SPZ-8400) Digital
Automatic Flight Control System Pilot’s Manual for the
Gulfstream IV.
A. Circuit Breakers:
The main hydraulic system is protected by the following circuit breakers
(CBs):
Circuit Breaker Name: CB Panel: Location: Power Source:
COMB HYD PRESS CPO A-3 ESS 28 VDC Bus
COMB HYD QTY CPO A-4 ESS 28 VDC Bus
L HYD S/O CPO A-5 ESS 28 VDC Bus
FLT HYD QTY CPO B-4 ESS 28 VDC Bus
R HYD S/O CPO B-5 ESS 28 VDC Bus
FLT HYD PRESS CPO C-4 ESS 28 VDC Bus
FLIGHT HYD CONT CPO C-5 L MAIN 28 VDC Bus
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B. Caution (Amber) Messages and Annunciations:
CAS Message: Cause or Meaning:
CHECK HYD
QUANTITY
Combined and/or Flight hydraulic system quantity is low.
CMB HYD FAIL Combined hydraulic system pressure low.
FLT HYD FAIL Flight hydraulic system pressure low.
C. Advisory (Blue) Messages and Annunciations:
CAS Message: Cause or Meaning:
CMB HYD HOT Combined hydraulic system reservoir fluid temperature
has reached 220 ±5°F (104 ±3°C).
FLT HYD HOT Flight hydraulic system reservoir fluid temperature has
reached 220 ±5°F (104 ±3°C).
4. Limitations:
A. Flight Manual Limitations:
(1) Hydraulic Fluids:
The following fire-resistant Type IV hydraulic fluids are approved for
use:
• Hy-Jet IV
• Hy-Jet IV-A
• Skydrol LD-4
• Skydrol 500B-4
B. System Notes:
(1) Although pulling the FIRE handle inhibits hydraulic fluid flow from
the reservoir to its respective engine-driven hydraulic pump, it also
closes the fuel shutoff valve, shuts off the alternator and disables the
thrust reverser, effectively shutting down the associated engine. The
flight crew should not pull the FIRE handles except in circumstances
when available guidance indicates doing so.
(2) Hydraulic fluids conforming to MIL-H-5606 and MIL-H-83282 are
used in the landing gear shock struts of Gulfstream IV aircraft.
Hydraulic fluids conforming to MIL-H-5606 and MIL-H-83282 are red
in color and are NEVER, UNDER ANY CIRCUMSTANCES, to be
mixed with the Type IV Phosphate Ester-based hydraulic fluids used
in the hydraulic systems of Gulfstream IV aircraft. Type IV
Phosphate Ester-based hydraulic fluids are purple in color.
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Combined Hydraulic
System Simplified Block
Diagram
Figure 2
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Flight Hydraulic System
Simplified Block Diagram
Figure 3
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Combined Hydraulic System Reservoir
Figure 4
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Flight Hydraulic System Reservoir
Figure 5
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System Shutoff Valve
Figure 6
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FLIGHT POWER SHUT OFF Valve
Figure 7
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Combined Hydraulic System Filter Manifold
Figure 8
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Flight Hydraulic System Filter Manifold
Figure 9
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Ground Test Panel
Figure 10
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2A-29-30: Auxiliary Hydraulic Systems
In addition to the two main hydraulic systems, two auxiliary hydraulic systems are
incorporated to provide operational redundancy and to perform various utility functions,
in some cases without the need for operating engines or external power sources. The
　
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