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This condition is a result of either an excessive air supply to air cycle machine (ACM) resulting
in overspeed/overtemp condition or an air bearing failure in the ACM. Excessive airflow (from
12th stage compensation) can be the result of operating cowl and/or wing anti-ice at high
altitudes.
ON GROUND ONLY
1. Air conditioning flow control and shutoff valve will automatically close.
2. Associated air conditioning pack switch ...........................................................................OFF
IN-FLIGHT
1. Assess current bleed air configuration. If COWL and/or WING ANTI-ICE is selected ON,
See LIMITATIONS, Section 1 (Temperature Range for Cowl Anti-Icing Chart) to determine
whether the use of anti-ice is required.
If COWL and/or WING ANTI-ICE is required, consider departing icing conditions before
proceeding to Step 2 OR if COWL and/or WING ANTI-ICE is ON but is not required:
2. Appropriate COWL/WING ANTI-ICE ..............................................................................OFF
3. Temperature Control Selector Switch (affected pack)............................. Select Warmer Temp
4. Wait one (1) minute
If COOL TURB HOT Message Remains ON
5. Affected Pack Switch........................................................................................ OFF (one only)
CAUTION: DO NOT TURN OFF BOTH PACK SWITCHES AT HIGH ALTITUDE.
If both air conditioning packs are affected, select only one pack switch OFF.
If COWL ANTI-ICE IS required or if airplane altitude is above 41,000 ft.,
6. COWL ANTI-ICE ...................................... ON (same bleed air system with pack shut down)
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-3
31 May 2000
If the cooling turbine hot message persists for second pack,
7. Start descent to lower altitude
8. Crew Oxygen Masks/Regulators ...............................................................................ON/100%
9. Passenger Oxygen Masks ................................................... Manually DEPLOY (If Required)
10. Second Pack Switch (If COOL TURB HOT Message Is Still Displayed) .........................OFF
11. Proceed to nearest suitable airport and land.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-4 FAA APPROVED
31 May 2000
3-02-00: ANTI-SKID SYSTEM
3-02-10: Anti-Skid Failure (Brake-By-Wire):
A failure occurring in the brake system which renders the anti-skid inoperative is indicated by the
illumination of the ANTI-SKID FAIL amber message on EICAS.
The system has automatically switched to open loop pulsed control. Open loop pulsed control
may be eliminated by selecting ANTI-SKID OFF, using the ANTI-SKID ON/OFF Switch
located on the center pedestal.
TAKEOFF
During takeoff with ANTI-SKID inoperative or Selected OFF, wheel spindown function will be
disabled.
Perform the following Steps for takeoff with the ANTI-SKID inoperative or OFF:
1. ANTI-SKID Switch ............................................................................................................OFF
2. Select Applied Brake Pressure Display on DU 4.
3. Before gear retraction after lift-off, momentarily apply light brake pressure (300 to 400 psi)
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-5
13 September 2000
APPROACH AND LANDING
If ANTI-SKID is selected OFF, braking should be performed using ANTI-SKID OFF BRAKING
procedure, this Section.
If ANTI-SKID is not selected OFF, braking in the open loop pulsed mode (BANG - BANG)
should be performed using the following procedure:
1. ANTI-SKID ...........................................................................................................CHECK ON
2. Select Applied Brake Pressure Display on DU 4.
3. Apply Maximum Reverse Thrust.
4. At Higher Speeds Use Braking as Required.
5. At Approximately 100 Knots Turn ANTI-SKID................................................................OFF
NOTE: At speeds below 100 knots the pulsing of open loop pulsed Anti-Skid causes braking
action to be jerky.
6. Refer to ANTI-SKID OFF BRAKING procedure this Section.
NOTE: An increase in landing distance will result if landing rollout is made with Anti-Skid
completely inoperative or under open loop pulsed anti-skid control. For landing
distances with Anti-Skid inoperative, see Landing Field Length Anti-Skid Inoperative
Chart, Performance Section. Use of Reverse Thrust reduces AFM landing distances.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
　
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