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737 > Air Conditioning > Flashcards

Air Conditioning Flashcards

0
Q

Can HIGH be selected for takeoff, apch or landing?

A

HIGH must not be selected for Takeoff, Approach, or Landing.

Single Engine performance is only calculated with Packs in AUTO or OFF.

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1
Q

In the event only one pack is operative, can the cabin altitude can still be maintained at or below 8,000 feet when the aircraft is at the maximum certified ceiling?

A

Yes

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2
Q

What side does external air hook up to?

A

External Pneumatic Air enters the pneumatic manifold on the right side of the Isolation Valve, and therefore provides pneumatic air directly to the right side of the system.

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3
Q

When gate side conditioned air is used, are the packs used?

A

Normally no

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4
Q

What is the purpose of the mix manifold?

A

The Mix Manifold is used to supply conditioned air to the cabin.
Conditioned air to this manifold can be supplied by the packs or from a conditioned air source when the aircraft is parked.

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5
Q

Which pack normally supplies air to the cockpit?

A

Left pack

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6
Q

Which series of 737s have recirculation fans?

A

The -800 and -900 aircraft have two Recirculation Fans that are used to enhance airflow through the mix manifold.
Air from the forward cabin and from the electrical equipment bay is drawn though a shroud located over the forward cargo compartment then flows through filters to the Recirculation Fans.
The Recirculation Fans then supply the recirculated air to the Mix Manifold.

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7
Q

Where is air from the mix manifold delivered?

A

The air from the Mix Manifold is delivered to the Overhead Distribution Duct through the left and right sidewall risers.
The Overhead Distribution Duct routes conditioned air to the cabin.
The duct extends from the forward to the aft end of the ceiling along the centerline and also supplies the sidewall diffusers.

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8
Q

Which series aircraft have trim air?

A

-800&-900

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9
Q

What does trim air do?

A

On the -800 and -900, a Trim Air system is used to provide specific temperature control for the cabin zones.
The Trim Air system uses hot bleed air to warm specific zones.
There is a Trim Air Pressure Regulator and Shutoff Valve that controls the operation of Trim air.
There are Trim Air Modulating Valves that modulate the warm air delivery to each zone.

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10
Q

The three compartment switches for the air conditioning panel regulate what valve?

A

Trim air modulating valves

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11
Q

Where is conditioned air sent in the cabin?

A

Under the seats and to overhead diffusers aft of #3 windows

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12
Q

What happens if the recirculation fans shut down?

A

If the Recirculation Fan shuts down, the Overboard Exhaust Valve automatically opens to provide the alternate means of ventilation for the equipment.

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13
Q

What electrical source powers the recirculation fans?

A

Normal AC power

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14
Q

Where does the R recirculation fan draw its air from?

A

The right recirculation fan draws air from the main cabin and electrical equipment bay through a shroud, filters the air and then discharges it into the air conditioning mix manifold.

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15
Q

On the ground , what causes recirculation fans to shut down?

A

On the ground with the Fan switches in AUTO, selecting either pack to HIGH will not affect the fans, but selecting both packs to HIGH will cause the Left Recirculation fan to shut down.

16
Q

What is the logic of recirculation fan shut down in flight?

A

Selecting either Pack switch to HIGH causes the Left Recirculation fan to shut down while placing both Pack switches to HIGH causes both recirculation fans to shut down and also causes the Overboard Exhaust valve to open.

17
Q

Details about the cooling fans for NG 737s:

A

There are four fans (two operate at a time) to provide the airflow to cool the EFIS equipment, cockpit circuit breaker panels, and E & E compartment equipment.
There are normal cooling and supply fans and alternate cooling and supply fans.
The equipment cooling Supply Fan (normal or alternate)forces air into the control stand and instrument panels, while the Exhaust Fan (normal or alternate) draws air through the E&E compartment. The supply fan is a push fan and the exhaust fan is a pull fan.

18
Q

What happens if the airflow is not sufficient for either supply or exhaust?

A

If the airflow is not adequate for (supply or exhaust), the associated OFF light illuminates, along with the OVERHEAD annunciator light and the Master Caution lights.
If the aircraft is on the ground with this airflow failure, a horn sounds in the nose gear wheel well.

19
Q

How do the OFF lights illuminate for the equip cooling fans?

A

Activated by thermal “no flow” detector

20
Q

What is the CONFIG for max cooling with the APU on the ground?

A

As an extra feature: On the ground with the APU BLEED switch ON, and either or both pack switch(s) in HIGH, the APU increases its’ bleed air flow rate to the packs.
Therefore, maximum cooling on the ground (when the APU is the bleed source) is achieved by placing the pack switches to HIGH.

21
Q

What does the RAM air system do?

A

The Ram Air system provides cooling airflow for the pack heat exchangers when the aircraft is inflight or on the ground.

22
Q

When are the RAM air doors open?

A

The Ram Inlet Doors are open fully when on the ground, or when inflight with flaps extended, or inflight when maximum cooling is necessary.
An annunciator light for each PACK illuminates RAM DOOR FULL OPEN in this situation.

23
Q

What is the purpose of RAM air deflector doors?

A

Each Deflector Door extends when on the ground to provide slush and debris protection to the Ram Air system.
The Deflector Doors are electrically operated, and are controlled by the air/ground safety sensor.

24
Q

What is the purpose of the RAM air fan?

A

The shaft of the air cycle machine compressor and turbine extends through a seal into the ram air duct.
A fan mounted on this shaft provides cooling air for the heat exchangers when the aircraft is on the ground or in slow flight.
The pilot does not have direct control of this fan operation.

25
Q

Temperature ranges for the ZONE TEMP panel switches:

A

The approximate temperature at COLD is 65F (180C) and the approximate temperature at WARM is 85F (30C). The approximate temperature at the center AUTO position is 70F (21C).

26
Q

What happens when the TRIM AIR switch is selected off?

A

With Trim Air selected OFF, the left pack provides air at the temperature selected for the flight deck and the right pack controller provides air at the temperature selected for the coldest cabin zone (FWD or AFT).

27
Q

How many controllers control the TRIM AIR MODULATING VALVES?

A

2, left and right side

28
Q

During single pack operation with the Trim Air ON, is the zone temperature controlled the same as during two pack operations?

A

Yes

29
Q

What happens during single pack ops w/o trim air?

A

During single pack operation with the Trim Air OFF, the operating pack attempts to provide air temperature that satisfies the average temperature demands of all three zones.

30
Q

What causes the ZONE TEMP LIGHT to come on?

A

Each Temperature Selector can be selected OFF, but this is for non-normal situations.
The Temperature Selector OFF position closes the associated Trim Air Modulating Valve, and the associated ZONE TEMP light comes on.
In this case, the temperature selector has no effect on the system, and without Trim Air, the affected zone temperature will tend to be the temperature delivered from the packs.

31
Q

What happens when are zone heat switches are OFF?

A

If all Temperature Selectors are in OFF, each pack delivers a default temperature.
The left pack supplies 750F (240C), and the right pack supplies 650F (180C).

32
Q

The Air Temperature Source Selector has how many positions?

A

The Air Temperature Source Selector has seven positions, and each position determines the area of display for the indicator.

33
Q

What also causes a zone temp light to come on?

A

In addition to the selection of the OFF position described earlier, the ZONE TEMP lights will also illuminate if there is a duct temperature overheat for a specific zone.
In this case, the associated trim air modulating valve closes.
The trim air modulating valve may be reopened after the duct has cooled by pressing the TRIP RESET switch on the BLEED panel. Always follow the non-normal procedure.

737 (15 decks)

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