pneumatics air systems

Trim air switch when turned on allows automatic and manual selection of pack controllers A or B enabled. True or False?

True — True. With TRIM AIR ON, the master trim-air valve opens and the zone trim valves operate automatically; the same selection also enables “automatic and manual selection of pack controller A or controller B.” [Ref: FCOM 2.10.5]

Pilot auxiliary heat is provided by ___ elements.

Electric — Pilot auxiliary/shoulder heat is electrical, not bleed-air heating. The FCOM states that flight crew shoulder heat is “provided by electric elements,” and the foot heaters also use electric heating elements. [Ref: FCOM 2.20.8]

Equipment cooling system provides cooling air for _____.

Flight deck equipment and the electrical and electronics compartment — The equipment-cooling system uses cooling air for avionics areas, specifically “flight deck equipment and the electrical and electronic (E & E) compartment equipment racks.” [Ref: FCOM 2.20.8]

Cabin Altitude Controller in Cruise Mode has a maximum of ____.

8,000 ft [Ref: FCOM 2.30.2]

Landing elevation limits are _ below mean sea level to _ above mean sea level.

-1,000 ft to +14,000 ft [Ref: FCOM 2.30.2]

Pack control selector switch in the normal position does:

Alternates automatically between A or B [Ref: FCOM 2.10.9]

The flight deck fan switch ON and all packs OFF means there is no airflow to the cockpit. True or False?

False — False - supplies recirculated air [Ref: FCOM 2.20.4]

Trim air switch turned on: all flight deck zone trim air valves operate automatically except:

NONE - flight deck/main deck trim valves operate automatically [Ref: FCOM 2.20.1]

Aft cargo heat switch ON provides bleed air heat to:

Aft and bulk cargo compartments [Ref: FCOM 2.10.8]

Engine Bleed Air Fault Light is caused by:

Bleed air overheat or overpressure, or PRV open when commanded closed [Ref: FCOM 2.10.16]

Three air conditioning packs draw air from:

Engines, APU, or external sources supplying the bleed air duct — The FCOM describes the triggering logic as “Section 20 - Air Conditioning System Description Flight Deck Fan 2.20.3 - Added 4X-IAB.” Those are the conditions that lead to Engines, APU, or external sources supplying the bleed air duct. [Ref: FCOM 2.40.1]

The pack valve is ___ controlled and ___ operated.

electrically, pneumatically [Ref: FCOM 2.20.2]

The temperature zone requiring the warmest temperature controls the pack outlet temperature. True or False?

False [Ref: FCOM 2.10.1]

Closing the right isolation valve will prevent bleed air from reaching hydraulic demand pump 4. True or False?

False [Ref: FCOM 2.40.5]

With the PAX temp selector in AUTO and the system operating normally, which temperature zone determines the outlet temperature of the packs?

The zone requiring the coolest temperature [Ref: FCOM 2.20.7]

What does selecting the equipment cooling selector STDBY position do?

Manually reconfigures the cooling equipment in flight for the FLIGHT situation [Ref: FCOM 2.10.6]

In flight, what does placing the captain's foot heater switch to LO or HI do?

The underfloor electric heater operates at low/high rate [Ref: FCOM 2.10.12]

Shoulder and foot heaters operate in flight only. True or False?

True [Ref: FCOM 2.10.11]

When is the EICAS warning message CABIN ALTITUDE displayed?

Cabin altitude greater than 10,000 ft [Ref: FCOM 2.50.1]

Placing the landing altitude in MANUAL is done when:

Landing altitude data is missing from the FMS — The condition/timing specified by the card is: Landing altitude data is missing from the FMS. [Ref: FCOM 2.10.14]

What does selecting the equipment cooling selector OVRD position do?

Provides cooling using reverse airflow for differential pressure [Ref: FCOM 2.10.6]

With a pack control selector in the NORM position, which of the following is correct?

Pack A or B is selected automatically on alternate flights as primary controller; the other is selected if the primary fails [Ref: FCOM 2.10.9]

The cabin pressurization system is normally fully automatic, but the outflow valves may be positioned manually. True or False?

True [Ref: FCOM 2.10.15]

At what cabin altitude will the outflow valves close in the automatic mode?

11,000 ft [Ref: FCOM 2.30.2]

When is the EICAS advisory message PRESS RELIEF displayed?

When one or both pressure relief valves open with all packs on — The FCOM describes the triggering logic as “Section 50 - EICAS Messages EICAS Alert Messages 2.50.2 - Added 4X-IAB.” Those are the conditions that lead to When one or both pressure relief valves open with all packs on. [Ref: QRH 2.27 / FCOM 2.50.2]

With the master temperature set at 83°F (28°C), what is the maximum zone target temperature setting using the cabin temperature panel?

85°F / 29°C [Ref: FCOM 2.20.8]

What does pushing the outflow valve MAN LEFT switch ON do?

EICAS outflow valve L is displayed and the outflow valve is controlled manually [Ref: FCOM 2.10.14]

Packs will be in high flow during _____.

Takeoff when HIGH FLOW is ON, or during takeoff/climb/approach [Ref: FCOM 2.20.2]

Which of the following regarding failure of the selected pack controller is true?

With Pack A or B normal, the controller switches automatically to the other controller [Ref: FCOM 2.20.2]

With the HI FLOW switch OFF, which of the following is true?

Pack airflow is controlled automatically [Ref: FCOM 2.10.7]

When is the EICAS advisory message BLEED displayed and the engine bleed air system fault light illuminated?

Bleed air overpressure or overheat, or HP bleed valve/PRV fails to close when commanded — The FCOM describes the triggering logic as “EICAS alert message BLEED is displayed for bleed overpressure, or PRV or HP bleed valve failed to close when commanded.” Those are the conditions that lead to Bleed air overpressure or overheat, or HP bleed valve/PRV fails to close when commanded. [Ref: FCOM 2.40.4 / FCOM 2.10.16]

What source normally supplies engine bleed air during low thrust conditions?

HP engine section — The system description identifies the relevant source/actuation: “Section 40 - Bleed Air System Description Introduction 2.40.1 - Added 4X-IAB.” That is why the correct source is HP engine section. [Ref: FCOM 2.40.1]

Where is pneumatic duct pressure displayed?

Primary and secondary displays [Ref: FCOM Chapter 2 — Air Systems]

What are the indications if an HP bleed valve fails to close when engine thrust is increased?

SYS FAULT light and BLEED # advisory message on EICAS — The condition/timing specified by the card is: SYS FAULT light and BLEED # advisory message on EICAS. [Ref: FCOM 2.50.1]

What does the EICAS advisory message >BLEED 1 OFF mean?

Engine 1 bleed valve is closed with engine running and bleed switch OFF [Ref: FCOM 2.50.1]

At high engine power settings, which engine compressor section furnishes bleed air for the pneumatic system?

The IP section — The system description identifies the relevant source/actuation: “Section 40 - Bleed Air System Description Introduction 2.40.1 - Added 4X-IAB.” That is why the correct source is The IP section. [Ref: FCOM 2.40.1]

Pushing the APU bleed air switch ON opens the APU bleed isolation valve with the APU running. True or False?

True [Ref: FCOM 2.40.3]

The PRV will open with the engine bleed air switch OFF when:

Nacelle anti-ice is selected ON, provided the HP bleed valve is not failed open, the start valve is closed, and there is no prior overheat problem — The condition/timing specified by the card is: Nacelle anti-ice is selected ON, provided the HP bleed valve is not failed open, the start valve is closed, and there is no prior overheat problem. [Ref: FCOM 2.40.2]

When is the EICAS advisory message BLEED ISLN L/R displayed?

Isolation valve switch position and valve position disagree — The FCOM describes the triggering logic as “BLEED ISLN L, R Advisory Isolation Valve switch position and valve position disagree.” Those are the conditions that lead to Isolation valve switch position and valve position disagree. [Ref: FCOM 2.50.1]

When will the APU bleed air valve open?

When the EICAS memo message APU RUNNING is displayed and the APU bleed switch is ON — The condition/timing specified by the card is: When the EICAS memo message APU RUNNING is displayed and the APU bleed switch is ON. [Ref: FCOM 2.50.1]

What is bleed air used for?

Air conditioning; pressurization; anti-ice; engine start; LE flaps; thrust reversers; hydraulic ADPs; hydraulic reservoir pressurization; potable water tank; cargo smoke detection; aft cargo heat [Ref: FCOM 2.40.1]