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(23) Verify amber “cabin pressure manual” light is extinguished.
4. Controls and Indications:
(See Figure 4 and Figure 5.)
A. Circuit Breakers (CBs):
Circuit Breaker Name: CB Panel: Location: Power Source:
CABIN PRESS 115V PO D-11 ESS AC Bus, φA
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Circuit Breaker Name: CB Panel: Location: Power Source:
CABIN PRESS 28V PO B-11 ESS DC Bus
CABIN PRESS IND PO A-12 ESS DC Bus
B. Warning (Red) CAS Messages:
CAS Message: SWLP Indication Cause or Meaning:
CABIN DFRN-9.8 None Cabin differential pressure
approaching upper limit (9.8).
CABIN PRESSURE LOW CAB PRESS LOW Cabin altitude has climbed
above limits (9250 ft ±750 ft).
C. Caution (Amber) CAS Messages:
CAS Message: Cause or Meaning:
CABIN DFRN-9.6 Cabin differential pressure has reached 9.6 psi.
CABIN PRES MANUAL Cabin pressurization controller has been switched to
MANUAL control, either automatically or manually.
D. Other Annunciations:
Indication: Cause or Meaning:
Amber Cabin Pressure Manual Light System in MANUAL control mode.
Amber MANUAL Legend On AUTO/
MANUAL Switch System in MANUAL control mode.
Amber ADC #2 Legend On ADC #1 /
ADC #2 Switch
ADC #2 providing static pressure signal
to transducer.
5. Limitations:
A. Flight Manual Limitations:
(1) Cabin Pressurization Control System:
(a) Maximum Cabin Pressure Differential Permitted: 9.80 psi
(b) Maximum Cabin Pressure Differential Permitted For Taxi,
Takeoff Or Landing: 0.3 psi
(2) Bleed Air System:
Do not operate above 41,000 ft without both engine bleeds ON and
each engine being bled by either the air conditioning system or
engine cowl anti-ice. See Section 05-01-10, Air Conditioning System
Shut Down Or Inoperative.
B. Operational Data:
Function: Value:
Normal Maximum Pressure
Differential 9.55 ±0.1 psi
Safety Pressure Relief 9.70 ±0.1 psi
Maximum Negative Differential -0.25 psi
Pressurization Rate Limiting 3,000 FPM
Depressurization Rate Limiting 3,000 FPM
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Function: Value:
Ground Differential Reference Signal 0.5 In Hg
Rate-of-Change Control ±10% of selected value at all cabin altitudes
Barometric Correction Range 28.00 to 31.00 In Hg Absolute Pressure
Cabin Altitude-Isobaric Programming
Range -1000 to 15,000 feet
Landing Altitude Selection Range -1000 to 15,000 feet
Rate-of-Change Selection Range
Minimum:
• 50 FPM UP
• 30 FPM DOWN
Maximum:
• 2000 FPM UP
• 2000 FPM DOWN
Rate to Maximum Differential Control
Transition
Not to exceed 50 feet with no overshoot
beyond the final control value.
Final Absolute Control Pressure
Within 140 feet of selected value at all cabin
inflow rates from outflow valve flow of 5 ppm
to maximum flow.
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Cabin Pressure Control
System Block Diagram
Figure 1
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Typical Flight Profile
Figure 2
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CABIN PRESSURE
CONTROL Panel
Figure 3
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Cabin Pressurization Selector Panel
Figure 4
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2A-21-30: Airflow and Temperature Control System
1. General Description:
The airflow and temperature control system for the Gulfstream IV provides for
comfortable cabin and cockpit temperatures throughout the operating envelope of
the aircraft by enabling the flight crew to perform the following functions:
• Select and control bleed air entering and exiting two Environmental Control
System (ECS) refrigeration pack assemblies, referred to as the Left and
Right ECS Packs. This dual pack concept provides redundancy in the
event one pack should fail. Source air into the ECS packs is provided to a
bleed air manifold by either an approved external air source or APU air
(while on the ground), or by High Pressure (HP) turbine bleed air from
Cabin Differential Pressure / Altimeter / Rate-of-Climb Indicator
Figure 5
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either or both of the aircraft’s engines (on ground or in flight). Through use
　
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