Air System Flashcards by Iomar Jesus

During preflight procedure the trim air switch is left in the OFF position and only one pack
is selected ON for air conditioning. What is the consequence?

With the TRIM AIR selected OFF, the pack attempts to produce an air temperature to satisfy
the average temperature demands of all three zones.

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When pressing Master Caution Recall the CONT CAB amber ZONE TEMP light illuminates.

Due to failure of the primary flight deck temperature control, automatic switching to the
backup system has occurred.

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When will the descent mode be activated in the pressurization system?

When descending 0.25psi below the selected flight altitude

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Due to a malfunction you are required to return to the airport of departure. To avoid the
OFF SCHED DESCENT warning you reset the FLT ALT. What can you expect?

The automatic abort capability for the departure airport is lost.

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From where does the Cabin Auto Controller get its inputs.

From the ADIRU’s

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Where are the bleed trip sensors installed?

Sensors are positioned on both sides of the engine bleed air valve.

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The right WING-BODY OVERHEAT light is illuminated, what area is affected?

Right engine strut

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What is the purpose of the recirculation fans?

To decrease the air conditioning system pack load.

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The wing-body overheat light comes on. What is the related master caution warning?

AIR COND

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One PACK light illuminates on recall only. What is the situation?

The primary pack control has failed and the pack is now controlled by the standby pack
control

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The primary pack control has failed and the pack is now controlled by the standby pack
control

Reduces air conditioning pack load.

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Cruising at FL 370. The motorized Overboard Exhaust valve will open if:

Either pack switches are in HIGH and recirculation fan is OFF.

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The amber OFF SCHEDULE DESCENT light illuminates. What does it indicates?

The aircraft has descended before reaching the planned cruise altitude set in the altitude
window.

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In MANUAL pressurization mode the outflow is driven by?

A motor supplied from DC standby bus.

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What is the primary source of conditioned air for the cockpit?

The Left pack.

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During descent when the descent mode is activated:

Aircraft descends 0.25 psi below the selected FLT ALT.

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The maximum differential pressure is:

9.10 psi

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What are the causes of an Amber AUTO FAIL light?

DC Power is Lost; Controller Fault; Outflow Valve Control Fault; Excessive Differential Pressure (>8.75psi sem correção); Excessive rate of cabin pressure change (>2000ft/min sem correção); High cabin altitude

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Given the scenario that the expected cruise level of FL310 was selected into the FLT ALT
selector during preflight, but subsequently the A/C climbed to FL390, would you expect:

A differential pressure of 9.1 psi maintained by the positive pressure relief valve;

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The cabin will automatically pressurize to 0.125 PSID on the ground when:

Engine thrust is increased towards takeoff thrust.

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AUTO mode active. The AUTO FAIL light illuminates when:

The cabin altitude exceeds 15,800ft.

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When both the AUTO FAIL light and the ALTN light illuminate:

Pressurization has automatically switched to the ALTN system.

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Loss of airflow due to failure of an equipment cooling fan results in illumination of the
related equipment cooling OFF light. Selecting the alternate fan should restore airflow and
extinguish the OFF light within approximately

5 seconds

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Where do the AUTO mode controllers receive their barometric information from?

The ADIRUs.

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Where is the forward outflow valve located?

There is no forward outflow valve.

The forward outflow valve:

Has been removed from the 737-600/700 models.

Why should livestock (animals) be transported in the FWD cargo holds?

Because they are heated by air from the E&E bay.

If a flight is aborted, and a return to the field of departure is made, the crew:

Should do nothing to the pressurization panel, as the system will automatically return to the field of departure.

What is the flight level limitation for DISPATCH with one pack INOP?

FL250.

Takeoff is allowed with Pack switches in HIGH, but landing is not permitted:

False.

The Altitude Warning Horn is:

An intermittent warning horn accompanied by a Master Caution warning.

On hearing the Altitude Warning Horn the pilot\'s first action should be to:

To don oxygen masks.

An amber AUTOFAIL indication will illuminate if one or more of the followingconditions occur:

A single controller failure when \'ALTN\' light is also illuminated.

A decompression of the cabin will result in the following:

An Altitude Warning Horn at 10,000 ft. At 14,000 ft (approximately) a \'Master Caution\', plus an \'Overhead\' indication on the light/glare shield will illuminate. The overhead panel will illuminate with \'PAX OXY ON\' amber indications.

A flight deck ZONE TEMP light which remains illuminated after the master caution system is reset indicates:

Both above statements are correct.

A ZONE TEMP light may be reset by the trip reset switch on the Bleed Panel.

True.

In Cruise the air conditioning ram air doors are:

Modulate between open and closed as required for pack temperature control.

If a PACK light can be reset by the TRIP RESET switch then:

The fault was caused by an overheat trip.

The ram air system provides cooling air for:

The heat exchangers.

Deflector doors are installed forward of the ram air inlet doors to prevent slush ingestion prior to liftoff and after touchdown. Deflector doors extend when activated:

Electrically by the air-ground safety sensor

If all zone controls and primary pack controls fail, the standby pack controlscommand the packs to produce air temperatures which will satisfy the averagetemperature demand of the two cabin zones. The trim air modulating valves will:

Close.

If all Temperature Selectors are positioned OFF, the pack controls will cause the Left pack to maintain a fixed temperature of ____ and the Right pack to maintain ____ as measured at the pack temperature sensor.

24°C (75°F) and 18°C (65°F)

Overheat detection is provided by temperature sensors located:

Downstream of the packs and the mix manifold

The recirculation fan system circulates air from the passenger cabin around the lining of the forward cargo compartment. When the overboard exhaust valve isclosed, exhaust air from the equipment cooling system is also diffused to the lining of the aft cargo compartment for additional inflight heating.

False. Forward cargo compartment only

The cabin pressure controller controls cabin pressure in the following modes: AUTO (automatic) - ALT (alternate) - MAN (manual).

All three modes use DC motor.

Cabin altitude is normally rate-controlled by the cabin pressure controller up to a cabin altitude of ____ feet at the airplane maximum certified ceiling of ____feet.

8 000 ft and 41 000 ft.

The air data inertial reference units (ADIRUs) provides ambient static pressure,baro corrected altitude, non corrected altitude and calibrated airspeed to bothautomatic controllers. The ADIRUs receive barometric corrections from theCaptain\'s and First Officer\'s BARO reference selectors.The automatic controllers also receive:

Throttle position from both stall management computers and signals from the air/ground sensors.

Cabin air outflow is controlled by the outflow valve and the overboard exhaustvalve. A small amount is also exhausted through toilet and galley vents,miscellaneous fixed vents, and by seal leakage.

True.

If both the primary and the standby pack controls fail for the same pack, thePACK, MASTER CAUTION, and AIR COND System Annunciator lightsilluminate.

The pack will continue to operate without control unless excessive

Manual Mode Operation: a separate DC motor, powered by the DC standby system, drives the outflow valve at a slower rate than the automatic modes. Outflow valve full range of motion takes up to 2 minutes.

False.

A DUCT OVERHEAT light only will cause:

The temperature mix valves to drive full cold and a BLEED TRIP OFF.

What systems need pneumatic power for operation?

Engine starting, air conditioning, pressurization, wing & engine anti-ice, hydraulic reservoirs and water tank pressurization.

Engine bleed air is obtained from:

5th and 9th stage of the compressor section.

Illumination of the amber BLEED TRIP OFF light indicates what valve has automatically closed?

Engine Bleed Air valve.

How are the Engine Bleed Air valves powered?

They are DC activated and pneumatically operated

An illuminated BLEED TRIP OFF light indicates:

Too high temperature or pressure in bleed air duct and bleed air valve stays closes.

What is the position of the isolation valve when the ISOLATION VALVE switch is in AUTO?

Open when any Engine Bleed Air switch or Air Conditioning pack switch is positioned OFF.

What happens when the WING BODY OVHT TEST switch is pressed?

The amber WING-BODY OVERHEAT Lights illuminate.

When does the amber DUAL BLEED Light illuminate?

When the APU bleed valve is open and the No.1 engine bleed switch is ON or the No.2 engine bleed switch is ON and the isolation valve is open.

In the PACK TRIP OFF Non Normal Check-List, the crew selects a warmer temperature in order to:

Reduce the workload on the affected air conditioning pack

The amber DUAL BLEED Light is illuminated before starting engines. What should you do?

Nothing. This is normal condition before engine start

The motorized Exhaust valve:

Allows for increased ventilation in the smoke removal configuration, Serves as backup to the outflow valve if the outflow valve fails, Is normally open in pressurized flights above 8,000 feet.

The amber DUAL BLEED light indicates apossible APU back pressure condition and thrust must be limited to IDLE.

True.

What happens to engine fan air that is used to cool engine bleed air?

It is discharged overboard.

What causes the amber PACK TRIP OFF Light to illuminate?

- Main distribution duct temperature has exceeded limits. - Compressor outlet duct temperature has exceeded limits. - Turbine inlet duct temperature has exceeded limits.

The ram air system deflector doors:

Full extent on the ground only.

If any individual zone is switched OFF, the Temperature Selector setting will be ignored by the temperature control system.

True

The Equipment Cooling Supply or Exhaust OFF light illuminated indicates a loss of airflow from the selected cooling fan. You position the EQUIPMENT COOLING SUPPLY/EXHAUST switch on ALTERNATE:

No further action is necessary in flight if the equipment cooling OFF light does not extinguish. See!QRH Air Systems EQUIPMENT COOLING OFF!

A leak in the APU Bleed Air Duct will be indicated by:

Left WING!BODY OVERHEAT light illuminates

On the Bleed Air Duct pressure indicator the L pressure indicates 40psi, the R pressure indicates 50psi:

As long as there is sufficient air for cabin pressurization, this is normal.

Air System Flashcards

(70 cards)