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Boeing Aircraft Configuration

A theoretical approach to Flight Attendant Training carried out by major airline and flight attendant training institutes

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Cabin Interior Systems

Passenger Service Unit (PSU)

Service units are provided throughout the airplane to supply cooling air, oxygen and electrical services for the customer's and Flight Attendant's use.

These units are fastened to the underside of the overhead bins, overhead and 4-5 inches forward of the seat backs. Each unit contains three air vent outlets, three reading lights with individual buttons, four oxygen masks, a passenger address speaker and one Flight Attendant call button. There are also "Fasten Seat Belt" and "No Smoking" signs located on the aft face of all units.

Customer Signs

Signs indicating "No Smoking" and "Fasten Seat Belt" conditions are located in the PSU's which insure visibility to all customers. Although the "No Smoking" and "Fasten Seat Belt" signs are contained in one unit, they function independently of each other. A "Return to Seat" indicator is in each lavatory and is visible only when the sign is on. The signs are controlled in the flight deck either manually or automatically. If the Captain selects automatic control, all signs will be on when the landing gear is down.

 

The "Fasten Seat Belt" and "Return to Seat" signs go off when the wing flaps are fully retracted. During the landing sequence, the "Fasten Seat Belt" and "Return to Seat" signs come on when the flaps are lowered or the landing gear is down. A single low-tone chime sounds over the customer address loudspeaker system each time the signs come on or go off. The "No Smoking Sign" stays illuminated during night and while on the ground. (Cross reference FA.R.s 121.317)

The oxygen masks drop automatically at a cabin altitude of 14,000 feet or may be dropped manually by inserting a pen or small stick into the "pin hole" located at the edge of the compartment.

To manually deploy oxygen masks, the "pin hole" is located in the middle of the PSU.

If no "pin hole" is present, insert an object into the edge of the compartment itself nearest the Flight Attendant call button.

In the 300 series aircraft, all PSU oxygen masks are connected to a single release lanyard. Pulling down on any mask releases the lanyard and all masks come down. The 02 generator in that PSU is activated supplying 02 to the PSU masks. 02 is generated through the line for approximately 12 minutes and can not be shut off once the generator is activated.

Lavatory units

Recessed In the ceiling of each lavatory is a compartment containing two oxygen masks. As in the other Passenger Service Units, these masks will drop from their container when the oxygen system is activated. The masks may be dropped manually by depressing "pin hole" in the compartment door. 02 will flow through the line for approximately 12 minutes.

Flight Attendant Units

These units contain two oxygen masks and are recessed in the cabin ceiling above the forward and aft Flight Attendant jump seats. 02 will flow through the line for approximately 12 minutes.

Flight deck Units

As previously stated, The flight deck has a completely separate oxygen system. It is a gaseous, dilute-demand system with four (4) individual masks and regulators for each flight deck crewmember. During the preflight check, the flight deck will switch the oxygen regulator to the 100% position.

FIGHT ATTENDANT CONTROL PANELS

There are two Flight Attendant control panels on all 737 aircraft.

On the 300 series aircraft, the panel is healed directly across from the Flight Attendant jump seat.

Cabin Lighting Control

Located on the forward Flight Attendant control panel are the controls for the cabin entry, ceiling, and window lights and a switch for the forward Flight Attendant work light. The aft Flight Attendant work light and aft entry lights are controlled from the aft control panel. Some controls may also have a setting marked night.

The Aft Attendant Control Panel

Located adjacent to the Flight Attendant jump seat, aircraft left on all series.

Both Flight Attendant control panels contain a public address (P.A.) hand-held microphone, a crew interphone, and the "call system" controls. In addition, the forward panel is equipped with the cabin lighting controls, while the aft panel contains the emergency light switch.

 

Emergency Light Switch

The emergency light switch, located on the Aft Flight Attendant control panel, is to be activated in case all electrical power is lost. It is important to note that a red cover protects the switch and must be lifted before the emergency lights can be turned on.

Interphone

The crew interphone is a handset with a push-to-talk, push-to-listen button to be used for Flight Attendant to Flight Attendant or pilot to Flight Attendant communication. The call buttons are used in conjunction as a signal to answer the interphone.

P.A. (Public Address System)

Announcements to the cabin are made via the public address system by utilizing the handheld push-to-talk type microphone. An automatic priority system sets the pilot's microphone for first priority.

Call System Controls

The call system controls, located on both the forward and aft control panel, include a Captain, Fight Attendant and Reset button.

In the customer cabin, there are two (2) different types of call lights secured to the forward and aft lowered ceilings. They are used for communication between the flight deck and the cabin or customer and lav to cabin.

Customer Call to Flight Attendant

The Flight Attendant call button is located on the underside of each passenger service unit. To call a Flight Attendant, the customer pushes the call button which illuminates the button in the PSU and the blue master call light located overhead in the forward and/or aft lowered ceiling. A one-toned chime sounds over the public address system. Customer to Flight Attendant calls are cancelled by pressing the button on the customer service unit. The blue call light will be extinguished when all buttons are reset.

 

Lavatory Call to Flight Attendant

The occupant of the lavatory can call a Flight Attendant by depressing the Flight Attendant call button in the lavatory. A high one-toned chime will sound in the cabin and an amber light will illuminate on the master call unit. The amber light will remain illuminated until the call button has been reset.

On some 300 series aircraft, the reset button is located in the lavatory. Some others have the reset button located on the bulkhead above the Flight Attendant jump seat, outside the lavatory door.

Captain Call to Flight Attendant

A pilot to Flight Attendant call illuminates the pink master call lights in the forward and aft lowered ceiling and on two-toned chime sound over the public address system. The lights remain on until the reset button is depressed at the Flight Attendant's panel.

Flight Attendant Call to Captain

A Flight Attendant to Captain call is made by pushing the Captain's call button at any Flight Attendant Control Panel. Pressing this button sounds a one-toned chime in the flight deck and illuminates a blue (Flight Attendant) light on the pilots overhead panel. The blue call light remains on only while the button on the Flight Attendant Control panel is depressed. The Flight Attendant may talk to the crew on the forward or aft handsets.

Flight Attendant Call to Flight Attendant

A Flight Attendant to Flight Attendant call is made by depressing the Flight Attendant call button on the Flight Attendant Control Panel. The pink master call light on the forward and aft lowered ceiling illuminate, and a two-toned chime sounds on the customer address system. The light remains on until the reset button is pressed at either Flight Attendant Control Panels. The Flight Attendants may talk to one another on the handset by depressing the push-to-talk button.

Lighting

Customer Cabin Lighting

General illumination of the customer cabin is provided by florescent lights in each overhead ceiling panel and above the upper portion of each window panel.

The fluorescent ceiling and window light intensity may be selected as either BRIGHT or DIM. In addition to the fluorescent lights, incandescent night lights are located in the ceiling area to provide a low level of illumination for night flights. All cabin window and ceiling lights are controlled from the forward Flight Attendant's panel.

If external power is connected to the airplane but is not being used by the pilots, a switch on the forward Flight Attendant's panel remarked "ground service" may be used to provide a power source for cabin lighting.

Entry Lights

The forward and aft entry areas are illuminated for boarding and departing by incandescent and florescent lights in the ceiling, and a threshold light near the door. A switch for the entry light is located on the respective Flight Attendants panel. Each switch has three positions: OFF, DIM and BRIGHT. Light illuminates the threshold when the respective entry light switch is in the BRIGHT position. The entry lights provide dim illumination when ground power is connected regardless of switch position.

Lavatory Lights

Lavatory lighting consists of one florescent mirror light and one dome light in each lavatory. The dome light will be on any time power is on in the airplane. The florescent light is controlled by a micro switch in the door latch. When the door latch is closed, the light will illuminate. When the airplane is on the ground, using external power, the florescent light will be on regardless of door position.

Exit Lights

In addition to the normal illumination, exit lights are provided in the forward and aft lowered ceiling, above each entry and galley door, and over each of the exit. In addition, lighting on or near the aisle door ensure illumination of the customer escape path. These lights are normally off and will illuminate if a loss of airplane power occurs or when the emergency light switch is activated. These lights are powered by self-contained batteries.

Galley Lights

Galley lighting for the forward or aft galley is provided by either florescent or incandescent lights beside or above the work area, these are controlled by a switch usually located beside the circuit breaker on the galley. Some aft galleys have additional lighting in the ceiling overhead. This is controlled by a switch beside the water gauge indicator pressurization galley door.

Air Conditioning and Pressurization

Normally, the air which is used for air conditioning and pressurization is supplied by the engines. The auxiliary power unit can also be used to supply air. Air entering the engines or APU is compressed to a high level before it is mixed with fuel and ignited. During compression, the temperature is controlled either automatically or manually by controls on the pilot's overhead panel.

Distribution

Air flows into the customer cabin through two completely separate compartments.

Conditioned air enters the cabin by way of sidewall ducts to a slotted overhead duct running 70% of the cabin. Part of this air enters the cabin through grills in the light fixtures at either end of the overhead duct.

Air also enters the cabin through individually controlled outlets in the customer service units and in the lavatories. This air is taken from the cold air side of the air conditioning system and is always colder than the main cabin temperature.

Air exits the cabin through floor level grills in the cabin sidewalls and through vents in the galleys and lavatories. As the air leaves the main cabin, it is routed around the cargo compartments to heat them and out the outflow valves. This process completely exchanges cabin air with outside, fresh air, every 2-3 minutes in all of our aircraft.

Air stairs (if applicable)

Forward Air stairs

The air stairs provide ground access for customer boarding and deplaning. The stairs are cased in the body of the airplane directly under the forward entry door and may be operated from either the inside or outside control panel. (Aircraft may or may not be outfitted with an air stair unit.)

Air stair Operation

The interior control panel is located above and to the left of the forward entry door. Operation of the stairs from this position requires that the entry door be opened far enough to provide good visibility of the area below. The open door also releases the air stairs door back pin. This lock pin prevents inadvertent operation of the air stairs while in-flight.

CAUTION: AIR STAIR SHOULD NOT BE OPERATED more FREQUENTLY THAN THREE CONSECUTIVE CYCLES OF NORMAL SYSTEM OPERATION WITHIN A 20 MINUTE PERIOD. AIR STAIR SHOULD NOT BE OPERATED IF WINDS EXCEED 40 KNOTS.

A. Normal Operation WARNING: WHEN OPERATING AIR STAIRS FROM INTERIOR CONTROL PANEL, OPEN ENTRY DOOR TO COCKED POSITION TO ALLOW CLEAR VISIBILITY OF AREA OUTSIDE AIRPLANE TO PREVENT INJURY TO PERSONNEL. DO NOT OPEN DOOR BEYOND COCKED POSITION WHILE OPERATING AIR STAIR OR EQUIPMENT MAY BE DAMAGED.

1. To Extend:
  a. Crack door at least six inches.

CAUTION: DO NOT RELEASE AIR STAIR CONTROL SWITCH UNTIL STAIRS OPERATING LIGHT IS EXTINGUISHED. RELEASING THE AIR STAIR CONTROL SWITCH BEFORE STAIR EXTENSION IS COMPLETE COULD RESULT IN JAMMING OF THE STAIRS AND STRUCTURAL DAMAGE.

  b. Move the "NORMAL" control switch in the "EXTEND" position until the STAIRS OPERATING light goes out.

NOTE: The forward air stair control panel is located above the forward entry door.

  c. Pull the upper handrail from the stairs and connect it to fittings inside the aircraft door. The stairs are ready for use.

2. To retract:
  a. Disconnect the handrails from their extend fittings and stow them in the handrails ensuring they are in a locked position.

NOTE: DO NOT RELEASE AIR STAIR CONTROL SWITCH UNTIL STAIRS OPERATING LIGHT IS EXTINGUISHED. RELEASING THE AIR STAIR CONTROL SWITCH before STAIR RETRACTION IS COMPLETE COULD RESULT IN JAMMING OF THE STAIRS AND STRUCTURAL DAMAGE.

  b. Move the "NORMAL" control switch in the "RETRACT" position until the STAIRS OPERATING light goes out.
  c. Close the forward entry door.

B. Standby Operation
1. Flight Attendants are required to request permission from the Captain to use the stand by system for air stairs.

WARNING: WHEN OPERATING AIR STAIRS FROM INTERIOR CONTROL PANEL OPEN ENTRY DOOR TO COCKED POSITION TO ALLOW CLEAR VISIBILITY OF AREA OUTSIDE AIRPLANE TO PREVENT INJURY TO PERSONNEL. DO NOT OPEN DOOR BEYOND COCKED POSITION WHILE OPERATING AIR STAIR OR EQUIPMENT MAY BE DAMAGED.

2. To extend:
  a. Crack door at least six inches.
  b. The Captain will ensure that the battery switch is in the ON position before standby operation.

CAUTION: DO NOT RELEASE AIR STAIR CONTROL SWITCH UNTIL STAIRS OPERATING LIGHT IS EXTINGUISHED. RELEASING THE AIR STAIR CONTROL SWITCH BEFORE STAIR EXTENSION IS COMPLETE COULD RESULT IN JAMMING OF THE STAIRS AND STRUCTURAL DAMAGE.

  c. Move switch guard to operate standby switch. Move the "STANDBY" control switch in the "STANDBY" position until the

STAIRS OPERATING light goes out.

NOTE: The standby switch is located in the air stair control panel over the forward entry door.

  d. Pull the upper handrails from the stairs and connect to fittings inside the aircraft floor. The stairs are ready for use.

3. To retract

CAUTION: IN STANDBY OPERATIONS, SAFETY SWITCHES ARE BYPASSED. FAILURE TO PROPERLY STOW HANDRAILS MAY RESULT IN DAMAGE TO THE AIR STAIR AND/OR AIRCRAFT STRUCTURE.

  a. Disconnect the handrails from their extend fittings and stow them in the handrails ensuring they are in a locked position.
  b. The Captain will ensure that the handrail extensions are properly stowed and the battery switch is in the ON position before standby operation.

CAUTION: DO NOT RELEASE AIR STAIR CONTROL SWITCH UNTIL STAIRS OPERATION LIGHT IS EXTINGUISHED. RELEASING THE AIR STAIR CONTROL SWITCH BEFORE STAIR RETRACTION IS COMPLETE COULD RESULT IN JAMMING OF THE Stairs AND STRUCTURAL DAMAGE.

  c. Move switch guard to the left and position the "STANDBY" control switch in the "RETRACT" position until the STAIRS OPERATING light goes out.

NOTE: The standby switch is located in the forward air stair control panel over the forward entry door.

  e. Close the forward entry door.

AIRCRAFT DIFFERENCES

Certain aircraft in our fleet house variations from what is considered "standard" configuration and structure as outlined in the FAM and Initial Training Program. Each cabin crew member is responsible to be aware of the differences that may be present on any one particular aircraft. A complete preflight check of the aircraft should be conducted to ensure that every crew member has knowledge of these variations. A detailed chart, identifying each aircraft tail (registration) number and associated differences, is found immediately following this section. The following differences may be present on any one particular aircraft. Emergency Equipment and Procedures are identified with an (*):

Forward Galley

  • A closet may be located nearest the forward entry door. The closet is part of a bulkhead that divides the jump seat from the general cabin area. This closet is primary used for crew luggage. The floor contents of the closet must not exceed 100 lbs. and must only consist of soft-sided articles. Likewise, contents hanging from the installed rod must be soft sided and not exceed 120 lbs.
  • A bulkhead may not be present at the forward entry door. In this instance, there is no physical separation between row 1 A/C left and the primary boarding door. Thus, row 1 A1/C left must be considered an Emergency Exit Row and the "A" Flight Attendant should ensure the selection criteria is met and verbally confirm ability with each passenger.
  • Crew life vests may be located behind the actual jump seat itself and not accessible through top stowage type compartments. In this case, the jump seat must be physically removed from the wall in order to preflight or retrieve each vest. The jump seat is secured to the wall by Velcro straps and must be properly fitted to the wall after each preflight inspection. Other aircraft jump seats are equipped with an underside compartment that houses each associated life vest. In this case, the compartment must be manually opened to preflight or retrieve the life vest (*).
  • The jump seat lap belt and shoulder harness may not be permanently attached together and must be manually secured. Each shoulder harness is fitted with a metal attachment point that slides onto the lap belt prior to being secured. All shoulder harnesses and lap belts should be fastened so that the buckles are secured low across the hips.
  • The galley may be equipped with either one or two coffee makers.
  • Reset procedures for lavatory smoke detectors vary. Some detectors have a "reset button" that can either be pressed or rotated to silence the alarm and reset the detector. Other detectors must have a pen, pencil, or pin inserted into an "inlet" hole to reset the detector. (*)
  • Boarding music may be available at the forward control panel.
  • Cabin crew chimes may consist of either single tone or dual tone chimes.
  • A forward air stair control panel may be located above the forward entry door and the aircraft may or may not be outfitted with airstrips.

Cabin

  • Smoke locator buttons may be present below the overhead bins at the overwing area. These buttons allow a person to locate the overwing exit area in a cabin that is consumed with smoke. If present, the buttons may consist of a single raised button, or a series of two or more aligned raised buttons. No preflight inspection of these buttons is necessary.
  • Exit signs that are secured to the central ceiling may consist of a single sign or dual sign. Regardless of number, each sign must be identified during the Emergency Briefing prior to flight. (*)
  • There may not be a divider between secured PBES and the open space in a particular overhead bin. Care should be taken to ensure that no single article restricts the availability of PBE retrieval. (*)
  • Row 12 may be the designated overwing exit emergency row on some aircraft instead of row 11.
  • On certain aircraft that are configured with 136 seats rather than 138, the seats deemed emergency exit row seats may include the two at the window exit as well as the seat immediately behind the window exit if it has direct access to the window hatch.
  • The Passenger Service Units may not contain gasped vents. On such aircraft, the ventilation system can not be independently controlled by the passenger.

Aft Galley

  • The number and location of galley units in the aft of the aircraft vary. Any one particular aircraft may be designed with a single a/c right "half galley", a "lull galley" located on both a/c right and left, or a transverse galley that spans the entire width of the aft service area and faces forward.
  • The standard forward facing double jump seat may be replaced by two aft facing single jump seats. In this case, one jump seat is located on a/c left, the other a/c right. The "B" Flight Attendant must always be seated in the jump seats closest to the aft entry door. While assuming the brace position, each aft facing Flight Attendant should ensure that his or her head is positioned against the jump seat/bulkhead. (*)
  • The aircraft may be outfitted with more than the standard number of jump seats. If the aircraft is equipped to seat more than four Flight Attendants, the additional f/a jump seats may not be occupied.
  • The aft galley may contain one or two coffee makers.
  • There may be a trash container located in the aft closet. If present, the fire extinguisher located above the container must be secure and in proper working order for the container to be used during flight. The extinguisher gauge needle must be within the green band. Caution should be taken during the servicing of this container to ensure that the extinguisher is left secured to the closet ceiling. (*)
  • One or two lavatories may be located in the aft section of the aircraft. If two lavatories are present, they may either be positioned aft of the galley area or aft of row 23, forward of the galley.
  • A viewing mirror may be located above the aft galley. The viewing mirror allows aft facing Flight Attendants to view and monitor the passenger cabin. The "C" Flight Attendant must preflight the mirror to ensure that it is secure.
  • Life vest locations: see FORWARD GALLEY (*)
  • Seat Belt: see FORWARD GALLEY
  • Lavatory Smoke Detector Reset: see FORWARD GALLEY (*)

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