2. Air Systems

Question 1

Recall AIR SD symbology and color-coding:

Flight Deck/Cabin Supply Duct Temperature

Answer 1

White - Normal

Amber - Temperature exceeds limit

Question 2

Recall AIR SD symbology and color-coding:

Flight Deck/Cabin Actual Temperature

Answer 2

White - Normal

Question 3

Recall AIR SD symbology and color-coding:

Flight Deck/Cabin Selected Temperature

Answer 3

Cyan - Normal

Question 4

Recall AIR SD symbology and color-coding:

Flight Deck/Cabin Temp Dial

Answer 4

Blank - Auto

White - Manual

Question 5

Recall AIR SD symbology and color-coding:

Air Conditioning Pack

Answer 5

White – Commanded OFF, no air flow

Green – Commanded ON, normal air flow

Amber – Commanded OFF, normal air flow

Amber (vaned) - Commanded ON with no air flow

Question 6

Recall AIR SD symbology and color-coding:

Cabin Altitude

Answer 6

White - Normal

Red - Above 10,000 feet

Question 7

Recall AIR SD symbology and color-coding:

Differential Pressure

Answer 7

White - Normal

Amber - Above normal limit

Question 8

Recall AIR SD symbology and color-coding:

Cabin Rate of Climb/Descent

Answer 8

White - Within normal limits

Amber - Exceeds normal limits

Question 9

Recall AIR SD symbology and color-coding:

Landing Altitude

Answer 9

White – Normal (Manually input)

Magenta – Normal (FMS generated)

Dashes – Invalid data

Question 10

Recall AIR SD symbology and color-coding:

OUTFLOW Valve Position

Answer 10

White - Normal

Blank - No data

Question 11

Recall AIR SD symbology and color-coding:

Outflow Valve CLSD

Answer 11

Amber - Fully closed

White - Not fully closed

Question 12

Recall AIR SD symbology and color-coding:

Bleed Air Valve

Answer 12

White - Commanded off (horizontal lines), or, commanded on (vertical lines)

Green - Commanded on with engine running

Question 13

Recall AIR SD symbology and color-coding:

APU

Answer 13

Blanked - APU air not available

White - APU air available but not selected

Green - APU air available and selected

Question 14

Recall AIR SD symbology and color-coding:

Bleed Air Temperature

Answer 14

White - Normal (°C).

Amber - Exceeds upper limit or temperature low with wing/tail anti-ice selected on

Question 15

Recall AIR SD symbology and color-coding:

Manifold Pressure

Answer 15

White - Normal

Amber - Exceeds high and low limits

Question 16

Recall AIR SD symbology and color-coding:

Isolation Valve

Answer 16

White - Commanded closed

Green - Commanded open

Amber - Valve position disagrees with commanded position

Question 17

Recall the function of the AVIONICS COOLING Switch

Answer 17

The AVIONICS COOLING Switch is operative inflight only and is used to control radio rack cooling:

 FAN - the primary fan cools the radios; if the primary fails, the backup fan comes on automatically

 OVRD - the radio rack fans are off, the venturi valve is commanded open and venturi airflow cools the radios

**Note: on the ground, both fans stay on all the time and the venturi valve is commanded closed

Question 18

Recall the function of the RAM AIR Switch

Answer 18

OFF - Ram air valve commanded closed

ON - Ram air valve commanded open, allowing ram air to enter the air conditioning ducts

The system provides ventilation for the cabin and the cockpit when air conditioning is not available

**Note: aircraft packs are not required to be running for ram air ventilation

Question 19

Recall the function of the PACK SHUTDOWN Switch

Answer 19

**Note: Both AC packs will automatically shut down if either engine fails during takeoff OR if selected OFF through the FMS. An affected pack will also shut down if a high supply duct temperature is sensed.

AUTO - Allows automatic pack shutdown in the event of an engine failure

OVRD – Overrides the auto pack shutdown for an engine failure OR when the packs are selected OFF on the FMC

Note: The auto pack shutdown feature is disarmed above 3000’ AGL

Note: Auto pack shutdown for hi supply duct temp cannot be overridden

Question 20

Recall the function of the FLOW Switch

Answer 20

NORM – The flow control valve solenoid is energized to provide a lower airflow rate

HIGH - The flow control valve solenoid is de-energized to provide a higher airflow rate

**Note: The FLOW Switch must be in NORM for takeoff

Question 21

Recall the function of the ISOL Switch

Answer 21

CLSD- The isolation valve is commanded closed, isolating the left and right pneumatic systems

OPEN- The isolation valve is commanded open - allows crossfeed of left and right pneumatic systems

AUTO- The isolation valve is controlled by the pneumatic system controller. Allows automatic crossfeed of left and right pneumatic systems during one bleed source operation with airfoil ice protection selected ON

Question 22

Recall where CABIN ALTITUDE and CABIN RATE are displayed

Answer 22

Cabin pressurization information is displayed on the AIR SD synoptic

Cabin Altitude and Cabin Rate information is also displayed on the SECONDARY ENGINE SD synoptic

Question 23

Recall the function of the Instrument Panel Flow Indicator

Answer 23

Note: During ground operations, with both air conditioning packs selected ON, the instrument panel cooling fan is not running – and instrument cooling is provided by the aircraft air conditioning system

Note: Airflow indications apply only during ground operations, and inflight with both air conditioning packs shut down

ON – On the ground, with one or both packs off, indicates instrument panel cooling fan airflow

OFF – On the ground, with one or both packs off, indicates the absence of airflow and cooling fan failure

**Note: During ground operations, if the APU is required for cooling and both pilots must leave the cockpit, one AC pack should be selected OFF. This will preclude possible Display Unit overheats caused by an inadvertent APU shutdown with both packs selected on

**Note: During flight operations, BOTH AC packs must be OFF for Display Unit cooling fans to operate

Question 24

Recall the function of the Gasper Booster Fan switch

Answer 24

ON (Push) – Provides supplemental airplane ventilation with or without air conditioning packs operating

OFF – booster fan is not on; switch is extinguished

**Note: With packs off during booster fan operation, the ram air valve should be manually selected ON (the valve does not open automatically)

Question 25

Recall the function of the CABIN PRESS control panel

Answer 25

**MANUAL** - When switchlight is pushed, MANUAL illuminates and the cabin pressurization system operates in manual mode **SELECT** - Illuminates to indicate failure of both automatic cabin pressure controllers Note: Switchlight is dark when the pressurization system is operating in automatic mode **MANUAL LDG ALT Switch** – used to set landing altitude when FMS data is not available **MANUAL (Climb/Desc)Switch** – manually repositions the outflow valve to increase/decrease cabin pressurization

Question 26

Recall the Takeoff with Air Conditioning Packs Off procedure

Answer 26

_Takeoff with Air Conditioning Packs Off_ **TO/APPR key**…………………………Push **PACKS** – Line select ON to OFF Observe PACKS ALL OFF alert message on EAD \*\*NOTE: Air conditioning packs will shut off at throttle advance and will come back on at 3,000 feet AGL

Question 27

Recall how forward and aft cargo bins are heated and where live animals must be transported

Answer 27

The forward cargo compartment is electrically heated to a temperature range between 60° and 75°F Live animals must be transported only in the forward cargo compartment, forward of the cargo door (Bin 1) The aft cargo compartment is heated with cabin exhaust air

Question 28

Recall the function of the Pneumatic Overheat Detection System (PODS)

Answer 28

**PODS** is automatically tested when the engine fire test is performed If a failure is detected in the anti-ice manifolds, PODS automatically closes the respective anti-ice valve and alerts the flight crew Detects overheat conditions in the tail compartment AND along the wing and tail ice protection manifolds