Operation Manual Part 2

Aerosoft – Digital Aviation
CRJ-70 & CRJ-900
AOM PART 2
Systems Description
VOL
5
5-1-38
26-Jul-2017
• FLT ALT: Select fan 2 during flight
• STDB: Selects conditioned air shut-off valve open
2. AVIONICS FANS CONTROLS
• GND ALT: Selects fan 1 during ground operations
• NORM: Fans operate in automatic mode: fan 1 supplies air in flight and fan 2 supplies air
during ground operations
• FLT ALT: Selects fan 2 during flight
ECAM MESSAGES
• OVBD COOL CAUTION (amber): Displayed when overboard exhaust shut-off valve is not closed AND
passengers and service doors are closed. Unable to pressurize in this state.
• DISPLAY COOL CAUTION (amber): Displays when low airflow in cockpit cooling duct is detected.
CABIN PRESSURIZATION SYSTEM
Cabin pressure is regulated by controlling the flow of outflowing valve by adjusting the outflow valve’s
position. To limit differential pressure when on ground a ground valve is installed to prevent excessive
differential pressure when on ground.
1. LDG LEVEL: Used to set
destination airport altitude,
selected value displayed on
EICAS
2. MAN ALT: Controls for
pressurization in manual
mode:
• UP: Opens outflow
valve, increase
cabin altitude
• HOLD: All manual selections disabled
• DN: Closes outflow valve, decreases cabin altitude
3. EMER DEPRESS (guarded): Depressurizes airplane in case of emergency, outflow valve is fully opened,
cabin altitude is dumped to 14.500ft
4. PRESS CONTROL: Selects between automatic and manual control
• MAN (white) light indicates manual mode is selected
• FAULT (amber) light indicates a fault of both pressure controllers
• OFF (no light) indicates automatic mode
5. MAN RATE: Adjusts altitude adjustment
• UP RANGE: +150 to +4.000 fpm
• DN RANGE: -100 to -2.500 fpm
ECAM MESSAGES
• CABIN ALT WARNING (red): Cabin altitude exceeds 10.000ft
• DIFF PRES WARNING (red): Differential pressure exceeds 8.6 PSI
• AUTO PRESS CAUTION (amber): Automatic pressurization control is unserviceable
• CABIN ALT CAUTION (amber): Cabin altitude between 8.500 and 10.000ft
• EMER DEPRESS CAUTION (amber): Emergency decompression activated