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control column effort and response time to inputs are increased while in
manual reversion, the aircraft remains capable of positive and harmonious
control.
3. Controls and Indications:
(See Figure 23 and Figure 24.)
A. Circuit Breakers (CBs):
Circuit Breaker Name: CB Panel: Location: Power Source:
GND SPOILER CPO C-6 Left Main DC Bus
SPD BRAKE/FLAP ALARM P D-4 Essential DC Bus
B. Warning (Red) Messages and Annunciations:
CAS Message: SWLP Indication Cause or Meaning:
ACFT
CONFIGURATION
ACFT CONFIG Position of one or more of the
following controls is not correct:
• FLAP Handle
• SPEED BRAKE Handle
• Landing Gear Control Handle
GND SPOILER GND SPOILER Failure of ground spoiler
component or deployed ground
spoiler panel.
Annunciation: Cause or Meaning:
Red NO GND SPOILERS light on
windshield center post.
Failure of ground spoiler component or
deployed ground spoiler panel.
C. Caution (Amber) Messages and Annunciations:
CAS Message: Cause or Meaning:
SPD BRAKE
EXTNDED
Speed brakes (flight spoilers) are deployed with power
lever(s) above idle.
D. Advisory (Blue) Messages and Annunciations:
CAS Message: Cause or Meaning:
GND SPOILER
UNARM
Ground spoiler system is not armed.
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CAS Message: Cause or Meaning:
SPD BRAKE
EXTNDED
Speed brakes are extended.
SPD BRAKE SWITCH FWC and FGC disagree on position of speed brakes.
Annunciation: Cause or Meaning:
SPEED BRAKE handle illuminated (pale
blue).
SPEED BRAKE handle not in RETRACT
detent.
4. Limitations:
A. Flight Manual Limitations:
(1) Use of Speed Brakes:
Speed brakes are not approved for extension with flaps at 39°
(DOWN) or with landing gear extended in flight.
(2) Use of FLIGHT POWER SHUTOFF:
Do NOT pull FLIGHT POWER SHUTOFF handle with speed brakes
extended.
(3) Automatic Ground Spoilers:
Takeoff is permitted with automatic ground spoilers inoperative,
provided anti-skid is operative and 20° flaps are used for takeoff.
When the Standby Electrical System is in operation, the following
limitations also apply:
(4) Use of Speed Brakes:
Speed brakes may be used, however, operation should be slow
(approximately five [5] seconds for full range movement).
(5) Landing with Standby Electrical System Operating:
Landing is approved provided automatic ground spoilers and thrust
reversers are not used for landing. See Section 05-17-50, Landing
With Standby Electrical Power System Operating.
B. Other Operational Information:
(1) Speed Brake Operating Envelope:
Speed brake operation is permitted within the flight envelope up to
and including VMO/MMO.
(2) Speed Brake Operating Altitude:
The use of speed brakes at altitudes below 2,000 feet AGL is not
recommended.
(3) Effects of Speed Brake Operation:
A mild nose-up trim change and some buffet may be expected when
speed brakes are fully extended. For passenger comfort, it is
recommended that speed brakes be extended and retracted slowly,
retrimming as required.
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OPERATING MANUAL
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2A-27-00 PRODUCTION AIRCRAFT SYSTEMS
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Spoiler Control System
Simplified Electrical
Diagram
Figure 22
OPERATING MANUAL
2A-27-00
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Spoiler/Speed Brake
Controls and Indications
Figure 23
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2A-27-00
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Ground Spoiler Controls
and Indications
Figure 24
OPERATING MANUAL
2A-27-00
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Spoiler/Speed Brake Control System Simplified Block Diagram
Figure 25
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Revision 8
2A-27-80: Gust Lock System
1. General Description:
The gust lock system for the Gulfstream IV provides a means for the flight crew to
manually protect the unpowered flight control surfaces from movement by wind
gusts while the aircraft is on the ground.
The gust lock is a mechanical ground safety system that neither affects the flight
performance of the aircraft nor receives any flight loads. The ailerons, elevators
and rudder are locked against gust loads by mechanical latches operated by the
GUST LOCK handle located on the cockpit center pedestal.
　
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