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to the one installed on the pilot side for aircraft S/Ns 1000-1252 without
SPZ 8400. The additional light legend is also RUD STRG OFF, and the
light will illuminate in conjunction with the light on the pilot side when nose
wheel steering is selected to HANDWHEEL ONLY.
• ASC 323: installs a geared hand control wheel for nose wheel steering in
aircraft S/Ns 1000-1230. The geared control wheel is production installed
in aircraft S/N 1231 and subsequent. The two to one ratio wheel provides a
less sensitive input for nose wheel steering, allowing smoother turns, by
increasing the control wheel rotation required for steering commands.
2. Controls and Indications:
A. Circuit Breakers (CBs)
Nosewheel steering is protected by the following circuit breakers:
Circuit Breaker Name CB Panel Location Power Source
STEER BY WIRE #1 CPO C-12 Essential 28V DC Bus
STEER BY WIRE #2 CPO D-12 Right Main 28V DC Bus
B. Caution (Amber) CAS Messages
Caution CAS messages associated with nosewheel steering are:
CAS Message Cause or Meaning
STEER BY WIRE FAIL Both steering channels have failed: steering not available.
System is in shimmy damping mode.
With ASC 176 incorporated, a switch position / system
status miscompare is detected
C. Advisory (Blue) CAS Messages
Advisory CAS messages associated with the nosewheel steering system
are:
CAS Message Cause or Meaning
RUDDER STRG OFF (With ASC 302A)
HAND WHEEL ONLY mode is selected on nose wheel
steering control panel
D. RUD STRG OFF Indicator (S/N with SPZ-8000)
If the NOSE WHL STR SEL CONTROL on the pilot side console is selected
to HAND WHEEL ONLY, a blue RUD STRG OFF indicator on the pilot
instrument panel (ASC 302A) and on the copilot instrument panel (ASC
302A AM2) will illuminate.
OPERATING MANUAL
2A-32-00 PRODUCTION AIRCRAFT SYSTEMS
Page 58
January 31/02
Revision 6
Nose Wheel Steering Controls and Components
Figure 20
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-32-00
Page 59
January 31/02
Revision 6
Nose Wheel Steering Hydraulic Schematic
Figure 21
OPERATING MANUAL
2A-32-00 PRODUCTION AIRCRAFT SYSTEMS
Page 60
January 31/02
Revision 6
LIGHTING
2A-33-10: General
Lighting systems installed on the Gulfstream IV provide illumination for ßight deck
operations, external illumination for landing, taxi guidance and airplane recognition.
Lighting for passenger convenience and emergency egress is also provided, as is
illumination for airplane servicing and loading / unloading.
The lighting system is divided into following subsystems:
• 2A-33-20: Flight Compartment Lighting System
• 2A-33-30: Passenger Compartment Lighted Panels and Signs System
• 2A-33-40: Cargo and Service Compartment Lighting System
• 2A-33-50: Exterior Lighting System
• 2A-33-60: Emergency Lighting System
2A-33-20: Flight Compartment Lighting System
1. General Description:
Flight compartment lighting provides illumination of instruments, switches and
controls, general illumination of ßight deck areas to facilitate crew functions, and
two (2) single point controls for full bright illumination of all installed lights. Lighting
levels are controlled with switches located on the following installations:
• Pilot Cockpit Lighting Control Panel (Forward)
• Pilot Cockpit Lighting Control Panel (Aft)
• Copilot Cockpit Lighting Control Panel (Forward)
• Copilot Cockpit Lighting Control Panel (Aft)
• Dome Light with Integrated Switch
• Pilot and Copilot Yoke-Mounted Map Lights
Electrical power for cockpit lighting is 28V and 5V DC from the Main, Essential or
Emergency DC buses. The GIV airplane is manufactured with a basic lighting
conÞguration, as described in this section. Numerous optional lighting features are
available for installation during the airplane completion process. Not all optional
lighting features are covered in this section due to the scope of the available
conÞgurations, however the most commonly installed options are mentioned
where appropriate.
2. Description of Subsystems, Units and Components:
A. Pilot Cockpit Lighting Control Panel (Forward, Airplanes 1000
through 1456):
(See Figure 1.)
The forward pilot lighting control panel has four (4) rotary light control
switches and three (3) light control / test pushbuttons. The rotary light
control switches are rheostats that enable selection of desired brightness
levels from off to full bright. The two forward-most switches, L GLRSHLD
FLT PNL and OVHD PNL are concentrically mounted dual controls. The
　
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