Ventilation

Question 1

Ventilation for:

Answer 1

Avionics
Batteries
Lavatories, galleys

Question 2

Ventilation system

Answer 2

Fully automatic
Uses two electric fans

Question 3

Components

Answer 3

Fans: circulate air around avionics, fan speed controller (high speed above 40 degrees, low below 35 degrees)
Skin air inlet, outlet: cool air in, hot air out

Question 4

Closed circuit

Answer 4

Skin air inlet and outlet closed, all air passes through heat exchanger

Question 5

Open circuit

Answer 5

Air passes through skin air inlet, outlet

Question 6

Intermediate config

Answer 6

Skin air inlet closed, skin air outlet partly open, cooling from heat exchanger

Question 7

Blower, extract fault alert

Answer 7

Closed config with air condition valve open
Either switch pushed closes the opposite fan

Question 8

Smoke config

Answer 8

Both buttons pushed
Air condition fan supplies cooling air, ducted via skin outlet partially open

Question 9

Lavatory and galley

Answer 9

Extraction fan vents via outflows valve

Question 10

Cargo ventilation

Answer 10

Extraction fan draws air from cargo bay, replaced by cabin air

Question 11

Cargo temp regulation

Answer 11

Hot air bleed able to mix with cabin air giving control from cockpit

Question 12

FWD cargo ventilation

Answer 12

Via inlet isolation valve, driven by fan or dP.

2 modes: on ground or dP less than 1, fan on. dP over 1 fan off, dP maintains ventilation

Controller closes valves and fan off when: FWD ISOL VALVE pb switch off, smoke detected

Question 13

Aft cargo ventilation

Answer 13

Air via inlet valve by fan, ducted by outlet isolation valve and outlet valve

When isolation valves fully open, extraction fan on continuous

Valves closed if: AFT ISOLATION VALVE pb switch off, smoke detected

Question 14

Aft cargo heating

Answer 14

Uses hot air bleed

Regulating valve regulates P of this supply, regulating valve controlled via HOT AIR pb on cargo heat panel