Aircraft Systems: APU and Electrical Power

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Questions and Answers

What is the consequence of failing to properly connect and adjust cabin crew harnesses during turbulent air conditions?

Increased risk of personal injury. (correct)

Enhanced emergency response time.

Reduced equipment accessibility.

Improved cabin crew movement.

Where must the station harness remain when not in use?

Fastened to the seat.

Attached to the nearest emergency exit.

Stowed in the overhead bin.

Unfastened for quick access. (correct)

Which control panel has work lights and an interphone/PA system for the cabin crew?

Galley control panel.

Left Attendant Control Panel (ACP). (correct)

AFT left control panel.

Front cockpit control panel.

What items must be available in the unit under the seat during the pre-flight station check?

Checklists, MRT, LV, flashlight. Signup and view all the answers

How can the ceiling and window lighting be adjusted?

Independently controlled with specific settings. Signup and view all the answers

What is the correct button sequence to alert the Pilot from the cabin interphone system?

Press 2 three times, then press 5 Signup and view all the answers

What color represents a passenger call on the master call light panel?

Blue light Signup and view all the answers

What function do entry lights serve?

To illuminate the threshold of each door. Signup and view all the answers

What should be done after each use of the interphone handset?

Press the re-set button Signup and view all the answers

What must crew work lights be set to during take-off and landing?

Off. Signup and view all the answers

How are galley lights controlled?

Individually in each respective galley. Signup and view all the answers

What is the purpose of the different colored lights on the master call panel?

To verify the type of call made Signup and view all the answers

Which of the following button combinations is used to perform an announcement via the interphone system?

Press 8, then push the PTT button Signup and view all the answers

What color light is activated when a lavatory call is made?

Amber light Signup and view all the answers

Which button must be pressed to make a call to a CCM station?

Press 5 twice Signup and view all the answers

The master call system’s panel includes lights to indicate which of the following?

Various types of calls Signup and view all the answers

What should be done with items that may break and leak inside the overhead bins?

They should be stored under the seat in front of the passenger. Signup and view all the answers

What is the function of the BAM lever on the Sky Interior bins?

To help close fully loaded bins. Signup and view all the answers

What equipment is included in the passenger service units located beneath the overhead bins?

Oxygen masks, speaker, and Attendant call buttons. Signup and view all the answers

What happens if overhead bin lids are forced to close?

They could open during turbulence or landing. Signup and view all the answers

Which of the following is true regarding the no smoking signs in aircraft?

They are sometimes indicated by stickers. Signup and view all the answers

What is the maximum number of oxygen masks typically included in a passenger service unit?

Four masks. Signup and view all the answers

Which feature is NOT typically found in the passenger service units?

Emergency exits. Signup and view all the answers

What could be the consequence of overloading overhead bins?

Difficulty closing the lid. Signup and view all the answers

What is the first step to open a door from the outside?

Check that the slide is armed Signup and view all the answers

What must be done to arm the escape slide?

Remove the girt bar from the floor brackets Signup and view all the answers

Where is the slide safety strap placed when the slide is armed?

Across the window Signup and view all the answers

What indicates the escape slide is in the disarmed position?

The girt bar is in the retainer hooks Signup and view all the answers

What is the final step to close a door from the outside?

Rotate the handle in the opposite direction of the arrow until fully closed Signup and view all the answers

What is indicated when the girt bar is secured in the floor brackets?

The escape slide is in the armed position Signup and view all the answers

During what phase must the escape slide be armed?

Before the flight Signup and view all the answers

How is the door unlocked from the outside?

Push the door release handle down/up Signup and view all the answers

What must be done to open the door?

Rotate the handle up and push out and forward Signup and view all the answers

What is the purpose of the door warning strap?

To secure the door when it is open and unattended Signup and view all the answers

What action must be performed before closing the door?

Press down on the door hinge release handle Signup and view all the answers

How should the door be held when it is being closed?

By grasping the assist handle and pulling Signup and view all the answers

What should be done after releasing the door due to the door being open?

Pull the door until the handle rotates opposite to the arrow Signup and view all the answers

What is required for opening doors without stairs or a bridge?

Extreme care should be taken and the door must be guarded Signup and view all the answers

What happens when the door is pushed outboard to the open position?

It can be locked against the fuselage Signup and view all the answers

What action should be taken if the vacuum system continues to work after the flush button is pushed?

Secure the lavatory as INOP Signup and view all the answers

What should be done with the door hinge release handle after starting to pull the door closed?

Release it after rotating the door a few degrees Signup and view all the answers

What is the heating duration for the water in the lavatory heaters?

4 minutes Signup and view all the answers

What temperature range does the water heater maintain?

52°C to 56°C Signup and view all the answers

What must be checked before each flight concerning the fresh water supply?

Fresh water tank indicator Signup and view all the answers

What happens when the waste tank becomes full?

The LAVS INOP light illuminates Signup and view all the answers

Where is the control panel for the fresh water tank located?

On the aft CCM’s panel Signup and view all the answers

What does the Clean / Check Sensor light indicate?

A sensor has failed or is fouled Signup and view all the answers

How is the lavatory door locked from the outside?

By moving the lock slide Signup and view all the answers

Study Notes

Aircraft Type Specific Information

05.01 Specifications: Includes Auxiliary Power Unit (APU), Electrical Power, Air Conditioning and Pressurization, and In-Flight Entertainment (IFE).
05.01.01 Auxiliary Power Unit (APU): The APU is a gas turbine engine that can operate both in the air and on the ground. It provides electrical power and bleed air for airplane systems, acting as a backup for external ground services when necessary.
05.01.02 Electrical Power: The electrical system supplies 115-volt AC and 28-volt DC power. Ground power can also be provided by the APU or external power carts. Electrical power in galleys shuts off automatically if other generators fail.
05.01.03 Air Conditioning and Pressurization: Bleed air for air conditioning and pressurization is usually supplied by the turbofan engines (under wings). The flight deck controls cabin temperature, which is separately controlled for the flight deck and passenger cabin.
05.01.04 IFE (In-Flight Entertainment): Some aircraft models have IFE systems (inboard or outboard) for passenger use. However, IFE systems are to be used only when instructed by the SCCM. Usage is restricted during taxi, takeoff, and landing unless it's a mandatory safety briefing.

05.02 Configuration

05.02.01 Passenger Seating: The B737 800 has 189 economy class seats, arranged 6 abreast. Seats located at over-wing emergency exits do not recline. All seats have seatbelts and a restraint bar for bag storage.
05.02.02 Overhead Stowage Bins: Above the passenger seats are overhead bins for storing baggage, often including blankets, pillows, and equipment. Bins have weight capacity limits to avoid dangerous overloads.
05.02.03 Passenger Service Units and Oxygen System: Located underneath overhead bins, passenger service units include air vents, reading lights, a call button, and indicators showing "Fasten Seatbelt" and "No Smoking" warnings. Each unit also has oxygen masks. Cabin crew stations have additional oxygen masks.

05.03 Cabin Doors

05.03.01 Opening Doors - Normal Operation: Doors open by rotating the handle. A red safety strap is usually located above each door.
05.03.02 Closing Doors: Use the handle to start closing, follow the hinge release to continue. The door must be locked by the mechanism that it locks into.
05.03.03 Exterior Operation of Doors: Exterior door operation is available for opening and closing.

05.04 Arming and Disarming Escape Slides

All doors have escape slides located below
The slide must be placed in "armed" mode before each flight by removing the girt bar from the hooks and placing it in the floor brackets
To disarm, remove and place into hooks beneath the slide
There is a safety slide strap located above each door

05.05 Emergency Operation of Doors

05.05.01 Escape Slide Specifications: Each door has a single lane escape slide, typically 508 cm long and 153 cm wide. The system is pressured with Nitrogen or CO2/nitrogen mix for quick inflation, and re-entry straps on the sides.
05.05.02 Deployment of Slides: Deploy the slide as indicated, with the aircraft being used and door opened to allow safe ejection
05.05.03 Using Slides for Ditching: If a ditching is necessary, do not use the aft doors, use the forward ones

05.06 Emergency Evacuation Routes

Emergency evacuation can be performed through four service doors and four over-wing emergency exits.
Flight deck crew members can use sliding windows.

05.06.01 Slide Length, Width and Doorsill Height

Details of slide dimensions and doorsill height.
05.06.02 Usable Exits: The appropriate exits to use for various scenarios are outlined.

05.07 Over Wing Emergency Exits

Four over-wing exits are present in the B737-800. The doors are opened using mechanical locks and a spring-loaded handle.
A 28-volt DC flight lock system manages the opening and closing of over-wing doors in situations including takeoff, landing, flight and ground operations.

05.08 Cabin Crew Stations

Stations are located in specific areas for cabin crew.
Seats have seatbelts/shoulder harnesses.
Equipment like interphone/PA system is found at the stations

05.09 Cabin Lighting System

Lighting can be independently controlled and adjusted.
There are different light types and settings for various areas.

05.10 Cabin Communication System

Handset is used to make calls across all areas (flight deck-cabin, cabin-cabin, etc.).
The handset has specific features for different calls or announcements
There is a reset button before placing handset back in its cradle.

05.11 Galleys

05.11.01-05.11.09: Details of various galley components (power, circuit breakers, water, waste, sinks, trolleys, ovens, etc.) and their required operation and maintenance requirements.

05.12 Lavatories

05.12.01-05.12.04: Information about lavatory features (toilets, wash basins, mirrors, vanity items, etc.), the waste system and their maintenance. Specific details for various aspects of lavatory operation are provided.

05.13 Flight Deck

05.13.01 Flight Deck Video Surveillance System: Real-time video surveillance of the area near the flight deck entrance.
05.13.02 Flight Deck Door: The flight deck doors have a three-position switch (Unlocked, Auto, Deny)
05.13.03 Flight Deck Windows: Two flight deck windows provide secondary emergency exits.
05.13.04 Flight Deck Seats: Adjustable pilot and co-pilot seats.

05.14 Internal Doors and Curtains

Information about internal doors and their operation

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Description

Test your knowledge on key aircraft systems, including Auxiliary Power Units (APU), electrical power supply, air conditioning, and pressurization. This quiz covers essential specifications and functionalities that are crucial for understanding aircraft operations. Perfect for aviation enthusiasts and professionals alike!