Air Systems

Question 1

BMC

Answer 1

Bleed Monitor Computer
Controls engine bleed valves

BMC’s command valves closed when:
Bleed leak
Over press or temp
Reversed airflow is sensed
When APU bleed is selected on
ENG BLEED pb is selected
ENG FIRE pb is pressed

Question 2

Engine bleed air vs APU bleed air

Answer 2

APU bleed air has priority

Question 3

APU on BLEED sd page

Answer 3

Always displayed in white
Space above is blank when APU off

Question 4

X BLEED valve and knob selector

Answer 4

In AUTO value opens and closes in response to the APU bleed valve
Automatically close with bleed leak

Question 5

High pressure external air limitation

Answer 5

Can not be used simultaneously with another air source

Question 6

Green GRD icon on bleed page

Answer 6

Appears only on the ground and does not reflect whether or not hp external bleed air is hooked up or supplying the aircraft

Question 7

Bleed air leaks

Answer 7

Wing and crossbleed duct monitored by double loop

APU and engine pylons have single loop

BMC’s automatically close associated bleed valve if a leak is detected

Question 8

What is not pressurized on the aircraft

Answer 8

Radome, landing gear bays, ac compartment, tail

Question 9

Cabin pressurization controllers

Answer 9

2 for redundancy and swap automatically after landing

Can be swapped manually by pressing the MODE SEL pb to manual for at least ten seconds

Question 10

Manually setting LDG ELEV

Answer 10

Necessary due to both FMGS’ s fail or landing airport not in database

Still auto controlled to that elevation

Question 11

Ditching pb closes which valves

Answer 11

Outflow, avionics ventilation inlet and extract, and pack flow valves
Emergency ram air inlet

All below floatation line

Question 12

CABIN PRESS overhead panel

Answer 12

Used only for abnormals

Question 13

Cabin pressurization display

Answer 13

On CRUISE page and CAB PRESS page
On cruise page in manual has an analog v/s display

Question 14

Normal pressurization modes

Answer 14

Ground mode
Outflow valve full open
Take off mode
Outflow valve begins to close
Climb mode
Adjusted v/s per fms cruise alt
Cruise mode
Maintains lowest cabin altitude per differential press
Decent mode
Rate of decent limited to 750
Abort mode
Used on an airport return and automatic

Question 15

Avionics equipment ventilation computer

Answer 15

Overhead VENTILATION panel

Status on CAB PRESS page sd

Question 16

Cargo Heat and Ventilation

Answer 16

Controlled on the CARGO HEAT overhead panel

Displayed on COND & CRUISE pages

Question 17

Lavatory extraction fan

Answer 17

Runs continuously when electrical pwr is on the airplane

Question 18

Battery ventilation

Answer 18

A Venturi pulls air over the batteries

Question 19

Avionics ventilation

Answer 19

On ground uses the “Open Configuration” which uses outside air.
Skin exchange isolation valve is closed in open configuration

On ground the “Closed Configuration” when cold temps on ground.

“Closed Configuration” is used in flight. Uses skin exchanger

Open configuration inlet and extract valves open and closed configuration they’re closed

“Intermediate Configuration”
Extract valve partially open
Used on grd and airborne in hot temps

Question 20

Avionics Smoke Configuration

Answer 20

Avionics Configurations
Open
Closed
Intermediate
Smoke
All automatic except smoke
Smoke configuration requires abnormal procedures placing the BLOWER & EXTRACT pb’s to override and that accomplishes:
Inlet, Extract, Bypass underfloor, skin exchanger, valves all close
Blower fan stops Extract fan continues to run
AC inlet valve opens
Small internal flap on extract valve opens

Question 21

Cargo Heat

Answer 21

Completely automatic

CARGO HEAT overhead panel

Displays on COND page