AIR MANAGEMENT SYSTEM CBT Flashcards
What is the ECS synoptic page?
Environmental Control System,
Showing the three bleed air sources.
WHAT ARE THE POTENTIAL BLEED SOURCES?
ENGINE 1
ENGINE 2
APU
WHERE IS THE COCKPIT AND CABIN TEMPERATURE DISPLAYED?
ON THE ECS SYSTEMS PAGE.
WHEN WILL THE FLIGHT ATTENDANTS HAVE CONTROL OF THE CABIN TEMPERATURE?
WHEN PAX CABIN IS SET FULL LEFT TO “ATTND”
WHAT IS THE OUTFLOW VALVE?
COTROLS AIRFLOW FROM THE CABIN THE OUTSIDE. CONTROLLING PRESSURIZATION.
(AUTO/MANUAL)
WHAT ARE THE RAM AIR VALVES FOR?
- Provide emergency ventilation in the case of PACK shutdown, and Smoke Removal.
- Includes a check valve when Ram air pressure > Cabin pressure
- Commanded open if both PACKS off below 25,000’
What is the Air Management System power?
ECS
Engine and wing anti-ice
Water pressurization
Engine Starter
What a the PACK?
Pneumatic Air Conditioning Kit
Provides heating, air conditioning, and pressurization.
How many PACKs are on board? How many do we need?
2 PACKs powered by on side engine or through a crossbleed valve (XBLD).
1 PACK can pressurize normally up to 31,000’
What is the purpose of the pressurization Safety Valve?
Provide over pressurization protections.
Automatically opens if pisd exceeds 8.6
Also provides negative pressure relief if -.5 is exceeded
Spring loaded/mechanical
What do the Engines supply the bleed air for?
- ECS
- Water pressurization
- Engine Start (no altitude restrictions)
- Engine and wing anti-ice
What can the APU supply bleed air for?
- ECS up to 15,000’
- Water pressurization
- Engine start up to 21,000’
- Cannot supply anti-ice*
Which cargo bay is the ECS maintain?
The forward cargo only.
Animals and Dry ice may only be stored in the forward compartment.
What happens in the forward cargo bay in the event of a fire?
The compartment is isolated from the main compartment by a SOV and check valve.
And the forward cargo fan is commanded OFF.
How do the push buttons on the Air Conditioning and Pneumatic control panel work?
AUTO-Pushed IN
OFF- Pushed OUT
Recirculation Fans button indications?
OFF: Pushed out, white strip illuminated.
AUTO: Turns ON the RECIRC fan when at least 1 PACK is on. OFF when both PACKs are OFF or Cargo smoke is detected.
What is required to use the “PAX CABIN” knob?
PACK 2
What is required to use the “CKPT” knob?
PACK 1
PACK 1/2 button indications?
OFF: Pushed out, white bar illuminated.
AUTO: Pushed in, OPENS PACK flow valve when bleed air is available. CLOSES PACK valve during ENGINE START and associated side BLEED system LEAK is detected.
Crossbleed button indications?
OFF: Pushed out, illuminated.
AUTO: OPENS XBLEED valve when bleed air source available on one side only.
CLOSES XBLEED when bleed leak is detected or fire extinguishing handle has been pulled.
External air connections
HP- for engine starting
LP-for cabin heating and cooling
Where are external air connections indicated in the cockpit?
HP- Shown on ECS synoptic page
LP- Not shown in the cockpit
Engine Bleed button indications?
OFF: Pushed out, white bar illuminated
AUTO: Pushed in, OPENS engine bleed when respective engine bleed is available.
CLOSES engine bleed when FIRE is detected or a duct leak/overpressure is detected.
APU Bleed button indications?
OFF: Pushed out, white bar illuminated
AUTO: Pushed in, OPENS APU bleed valve when APU bleed is available.
CLOSES APU bleed valve when APU or LEFT bleed LEAK is detected, ANTI-ICE system is ON, or Left engine bleed is available.
What is a limitation of APU bleed air?
It cannot supply air for ANTI-ICE.
How can the pressurization be operated?
Controlled automatically or manually
Cabin alt knob selections?
DOWN: Held in this position , the cabin altitude will decreases (increases cabin pressure)
STOP: OFV movement will stop, Spring loaded to STOP
UP: OFV moved toward OPEN and CABIN altitude increases (decrease in cabin pressure)
Pressurization Mode Knob selections
AUTO: AUTOMATICALLY control pressurization throughout entire flight, LANDING altitude automatically set by flight plan
LFE CTRL: AUTOMATICALLY control pressurization throughout entire flight, LANDING altitude automatically set MANUALLY
MAN: MANUALLY control OFV with the CBAIN ALT knob
When would we use the LFE CTRL on the Pressurization mode knob?
When we are landing at a destination that is not in the database.
What happens when the DUMP button is pressed?
- Provides rapid depressurization by OPENING the OFV to command a 2000 FPM to 12,400’ cabin altitude (OFV closes)
- Commands the PACKs OFF
- Commands the recirculation fans OFF
Does the DUMP button work in manual pressurization?
No, must be done by the pilot.
When would we use the DUMP button?
During the Smoke Evacuation
Mask Deploy Knob indications
OFF: Disables automatic deployment
AUTO: Automatically deploys pax O2 masks when cabin altitude reaches 14,000 to 14,750’
ON: Deploys pax O2 masks
How is pax O2 provided? How long will it last?
Supplied by an O2 generator, will last about 12 minutes.
What do the following pressurization EICAS information indicate, ALT, RATE, ΔP, and LFE?
ALT- Cabin altitude
RATE- Rate of change of cabin altitude
ΔP- Differential pressure
LFE- Landing field elevation
What is the maximum ΔP?
- 8 psi FL370 and below
8. 4 psi above FL370
