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shutoff valve to the selector valve, which directs pressure through
flow regulators to the appropriate side of the hydraulic motor.
As the hydraulic motor turns, it drives the flaps in the desired
direction through the central gearbox, torque shafts and screwjacks.
The central gearbox at the same time also drives the horizontal
stabilizer to the desired setting to maintain longitudinal stability.
When the flaps reach the desired position, the follow-up switch
opens, breaking the circuit to the flap control relay. The relay
de-energizes to close the flap shutoff valve and the flap selector
valve is de-energized closed. Hydraulic pressure stops and the flaps
stop moving.
(2) Emergency Operation:
Placing the EMERG FLAP switch to EMERG deactivates the normal
FLAP handle and follow-up switches to allow direct control of the
flap control relay. A red X appears on both the pilot’s and copilot’s
normalized AOA display (lower left portion of the Primary Flight
Display [PFD]). The flap control relay energizes to open the flap
shutoff valve and hydraulic pressure flows to the flap selector valve.
Flap asymmetry protection is still provided because flap control
relay power is routed through the asymmetry switches.
Moving the EMER FLAP handle from NEUTRAL to the FLAPS UP
or FLAPS DOWN position directs hydraulic pressure through the
flap selector valve to the hydraulic motor. The motor operates and
the flaps move. When the flaps reach the desired position, moving
the EMER FLAP handle to NEUTRAL stops the flaps.
3. Controls and Indications:
(See Figure 17.)
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 59
October 11/02
Revision 8
A. Circuit Breakers (CBs):
Circuit Breaker Name: CB Panel: Location: Power Source:
FLAP CONT CPO A-1 Essential DC Bus
FLAP/STAB POS CP E-5 Emergency DC Bus
MANUAL FLAP CONT CPO B-1 Essential 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
C. Caution (Amber) Messages and Annunciations:
CAS Message: Cause or Meaning:
FLAP ASYMMETRY (1) Flap position asymmetry detected. Flaps have stopped
moving toward selected position.
NOTE(S):
(1) For SPZ-8400 equipped aircraft having ASC 69A (Flap Asymmetry
Indicator Installation).
Annunciation: Cause or Meaning:
FLAP ASYM indicator under FLAP /
STAB position indicator illuminated
amber. (1)
Flap position asymmetry detected. Flaps
have stopped moving toward selected
position.
NOTE(S):
(1) For SPZ-8000 aircraft having ASC 69A (Flap Asymmetry Indicator
Installation).
4. Limitations:
A. Maximum Landing Flaps Extended Operating Altitude:
Maximum operating altitude for extending landing flaps (39°), or flying with
landing flaps extended is 20,000 ft MSL.
B. Flaps Extended Speeds (VFE / MFE):
(1) Takeoff (10°): 250 KCAS / 0.60 MT
(2) T/O APP (20°): 220 KCAS / 0.60 MT
(3) DOWN (39°):
• 170 KCAS / 0.60 MT — SN 1000 through 1213 without ASC
190
• 180 KCAS / 0.60 MT — SN 1214 and subs, SN 1000 through
1213 with ASC 190
OPERATING MANUAL
2A-27-00 PRODUCTION AIRCRAFT SYSTEMS
Page 60
October 11/02
Revision 8
Flaps Simplified Block
Diagram
Figure 18
OPERATING MANUAL
2A-27-00
Page 61 / 62
October 11/02
Flaps Simplified Electrical
Diagram
Figure 19
OPERATING MANUAL
2A-27-00
Page 63 / 64
October 11/02
Flaps / Horizontal Stabilizer System Hydraulic Control Diagram
Figure 20
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 65
October 11/02
Revision 8
Configuration Warning System Simplified Electrical Diagram
Figure 21
OPERATING MANUAL
2A-27-00 PRODUCTION AIRCRAFT SYSTEMS
Page 66
October 11/02
Revision 8
2A-27-70: Spoiler System
1. General Description:
The spoiler system for the Gulfstream IV assists the flight crew in maintaining roll
control of the aircraft, functioning as flight spoilers. Additionally, while in flight, the
spoilers extend to decrease airspeed and increase descent rate, functioning as
speed brakes. On the ground after landing, they function as ground spoilers,
extending to help dump any remaining lift and increase braking effectiveness.
The aircraft has three spoilers on the upper trailing edge of each wing (from
　
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