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Pilot’s Manual
6-32 PM-126A
CABIN PRESSURE CONTROL DIAGRAM
Figure 6-11
F40-060000-011-01
PAX OXYGEN PRESSURIZATION
CAB RATE
PAX DEPLOY
OXY/AUTO
ON ON
ON
ON
ON
EMER PRESS
PACK
HI FLOW
L BLEED R BLEED
ON ON ON ON
MANUAL
PRESS
EMER
DEPRESS
DELTA P
CAB ALT
CABIN PRESSURE CONTROL
MANUAL
DN UP
LDG ALT
DN UP
FPM
PSID
FT
CABIN PRESSURE CONTROLLER
CABIN PRESSURE
ADC1/ADC2
LDG GEAR SW
THROTTLE SW (82% N1)
L MAIN BUS
L PRESS
CABIN PRESSURE
ADC1/ADC2
LDG GEAR SW
THROTTLE SW (82% N1)
EMER BATT BUS
R PRESS
ACM BYPASS
RELAY (40,000 FT.)
PRIMARY
(LEFT)
CHANNEL
SECONDARY
(RIGHT)
CHANNEL
CABIN
OXYGEN
14,500 FT.
CABIN ALTITUDE
VOICE MESSAGE
AND
CABIN ALT (CWP)
10,000 FT.
OR
14,500 FT.
JET PUMP
(VACUUM SOURCE)
HP BLEED
AIR
BLEED AIR
EXHAUST
CHECK
VALVE
CABIN AIR
(FILTERED)
TORQUE
MOTOR
SECONDARY
OUTFLOW
VALVE
TORQUE
MOTOR
STATIC
PORTS
PNEUMATIC
SLAVE
LINE
PRIMARY
OUTFLOW
VALVE
CABIN
ALTITUDE
LIMITER
CABIN
ALTITUDE
LIMITER
1. CABIN ALTITUDE
(AMBER & RED)
2. LR CABIN PRESS FAIL
3. CAB PRESS MAN
4. CAB DELTA P
5. L EMER PRESS ON
6. R EMER PRESS ON
7. L CABIN PRESS FAIL
8. R CABIN PRESS FAIL
9. CAB PRESS MAN
13. EMER DEPRESS
EMER PRESSURE
9,500 FT.
OR
14,500 FT.
350
1.2
1300
DELTA P
LIMITERS
(9.7 PSID)
10. LR ECS FAIL
11. L ECS FAULT
12. R ECS FAULT
Pilot’s Manual
PM-126A 6-33
PRESSURIZATION WARNING SYSTEM
The pressurization system provides the capability to operate at high altitude
fields (8000 - 13,700 ft elevation) without triggering annunciations
and emergency pressurization. The logic employed for this
feature is as follows:
Applicable operating rules, pertaining to the use of oxygen at high cabin
altitude, must be observed.
The following CAS illuminations are specific to the pressurization
warning system:
Conditions Pressurization system will:
TAKEOFF
Takeoff from field
elevation less
than 8000 ft
- Annunciate loss of cabin pressure if cabin altitude exceeds 8750 ft.
- Activate emergency pressurization if cabin altitude exceeds 9500 ft.
- Activate cabin altitude warning voice if cabin altitude exceeds 10,000 ft.
- Aircraft 45-236 & subsequent and prior aircraft modified by SB 45-22-5, activate
CABIN ALTITUDE red CAS and CABIN ALT red CWP if cabin altitude
exceeds 10,000 ft.
Takeoff from field
elevation greater
than 8000 ft
- Annunciate loss of cabin pressure if cabin altitude exceeds 14,500 ft.
- Activate emergency pressurization if cabin altitude exceeds 14,500 ft.
- Activate cabin altitude warning voice if cabin altitude exceeds 14,500 ft.
- Aircraft 45-236 & subsequent and prior aircraft modified by SB 45-22-5, activate
CABIN ALTITUDE red CAS and CABIN ALT red CWP if cabin altitude
exceeds 14,500 ft.
When the aircraft climbs above 24,500 ft:
Resume settings specified in “Takeoff from field elevation less than 8000 ft”.
LANDING
Landing at field
elevation less
than 8000 ft (as
selected on LDG
ALT)
- Annunciate loss of cabin pressure if cabin altitude exceeds 8750 ft.
- Activate emergency pressurization if cabin altitude exceeds 9500 ft.
- Activate cabin altitude warning voice if cabin altitude exceeds 10,000 ft.
- Aircraft 45-236 & subsequent and prior aircraft modified by SB 45-22-5, activate
CABIN ALTITUDE red CAS and CABIN ALT red CWP if cabin altitude
exceeds 10,000 ft.
Landing at field
elevation greater
than 8000 ft (as
selected on LDG
ALT)
Maintain the settings specified in “Landing at field elevation less than 8000 ft
(as selected on LDG ALT)” until the aircraft descends below 24,500 ft.
When the aircraft descends below 24,500 ft:
- Annunciate loss of cabin pressure if cabin altitude exceeds 14,500 ft.
- Activate emergency pressurization if cabin altitude exceeds 14,500 ft.
- Activate cabin altitude warning voice if cabin altitude exceeds 14,500 ft.
- Aircraft 45-236 & subsequent and prior aircraft modified by SB 45-22-5, activate
CABIN ALTITUDE red CAS and CABIN ALT red CWP if cabin altitude
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