Air Systems

Question 1

ZONE TEMP

Answer 1

-Overtemperature
-For CONT CAB also means both temperature controllers failed

Question 2

PACK Switch AUTO

Answer 2

-With Flaps Up and other switch OFF, regulates to high flow
-When supplied by APU, regulates to high flow

Question 3

Engine Bleed System

Answer 3

-From 5th and 9th stages of compressor (4 / 9 for MAX)
-Valves DC operated and pressure activated

Question 4

Duct Pressure

Answer 4

-Min 18psi
-Max 60psi
-If shows 0, try to press Trip Reset

Question 5

Unbalanced PACK Temperature Control

Answer 5

-When trim air supply not available
-If CONT trim air not available: Left PACK supplies selected CONT temperature
-If cabin or all trim air not available: FWD / AFT average

Question 6

AC Distribution

Answer 6

-Left PACK to cockpit, rest to mix manifold
-Right PACK to mix manifold
-Recirculation Fans and Ground Air to mix manifold

Question 7

Zone Temperature Controllers

Answer 7

-Left Electronic Controller: Aft Cabin and Backup for Flight Deck
-Right Electronic Controller: Forward Cabin and Primary for Flight Deck

Question 8

Overboard Exhaust Valve Open

Answer 8

-On the ground and inflight <2psi differential pressure
-Either PACK Switch HIGH AND R Recirculation Fan Switch OFF

Question 9

Differential Pressure Limits

Answer 9

-8.35psid >37000ft
-7.80psid 28000-37000ft
-7.45psid <28000ft
-8.45psid when climbing above FLT ALT

Question 10

Maximum Cabin Altitude

Answer 10

8000ft

Question 11

AUTOFAIL Light Reasons

Answer 11

-Cabin pressure change >2000fpm *
-Differential pressure >8.75psid *
-Cabin Altitude >15800ft *
-Outflow Valve control fault
-Controller fault (*)
-Loss of DC power

Question 12

Cargo Compartment Minimum Temperatures

Answer 12

-FWD +5 degrees
-AFT 0 degrees

Question 13

Engine and APU Bleed for PACK Operation

Answer 13

-APU is capable for 2 PACKs on the ground
-Don’t operate 2 PACKs from one engine on the ground
-Engine is capable of 1 PACK inflight (MAX 2 PACKs)