Patent Abstract:
A system and method directed to providing a communication system for receiving data from sources outside the aircraft, storing the received information and then presenting the received information on a portable display device having a screen that may be read with the necessary information. The portable display device may interface with a docking station for receiving the data from a communication management unit and then removed and passed freely among flight attendants or other personnel on the aircraft. Further, the portable display device may be interfaced with other docking stations in other parts of the aircraft to communicate with the communication management unit.

Full Description:
CROSS REFERENCE TO RELATED APPLICATION  
       [0001]     This application claims priority from U.S. Provisional Application 60/642,190 titled, “SYSTEM AND METHOD FOR PORTABLE COMMUNICATION DEVICE IN AN AIRCRAFT,” which was filed on Jan. 5, 2005, and which is incorporated by reference. 
     
    
     TECHNICAL FIELD OF THE INVENTION  
       [0002]     The present invention relates, generally, to the field of telecommunications and more specifically, the present invention relates to a system and method directed to a communication system for handling communications within an aircraft or other vehicle.  
       BACKGROUND OF THE INVENTION  
       [0003]     Aircraft (and other large vehicles, such as ships) use a great number of communications systems to coordinate communications in air traffic between air traffic controllers, airports, and other aircraft (or vessel traffic in the case of ships). One such conventional system  100  is shown in  FIG. 1  wherein a central-aircraft communication system  110  is typically located within an aircraft (not shown) and is operable to communicate with a number of exterior communications systems including an Aircraft Communication Addressing and Reporting System (ACARS)  120 , Satellite Communications (SatCom)  121  and Telephony  122  systems. The central-aircraft communication system  110  typically further includes a communication management unit  111  for receiving various communications from the external communication systems mentioned above. Information received at the central-aircraft communication system  110  from any of these sources as well as others is typically assimilated and organized by the communication management unit  111 .  
         [0004]     A pilot or other aircraft personnel may interact with the communication management unit  111  via a message display and entry device  112  that is communicatively coupled to the communication management unit  111 . In this manner, the individual may step through all received information for display or manipulation according to known methods and established standards for any number of types of information. Examples of received and assimilated information include air traffic updates, weather reports, gate assignments, pre-flight, flight, and post-flight checklists, etc. As is expected, sometimes this information may be useful to be printed on paper for easily marking up or handing to other aircraft personnel as the message display and entry device  112  is affixed to the cockpit and difficult to access by any other personnel other than the pilot.  
         [0005]     Thus, the message display and entry device  112  is typically communicatively coupled to a printer  113  such that any information displayed on the message display and entry device  112  may be printed at the printer  113 . As a result, the above-mentioned information may be printed such that a hard copy of the information may be passed to aircraft personnel not seated in the cockpit of the aircraft, e.g., flight attendants, etc. It is advantageous to be able to pass a physical copy of the information received to other people for use in a different part of the aircraft.  
         [0006]     A problem with the system  100  of  FIG. 1  is that printers  113  are inherently expensive. A typical printer  113  that conforms to established avionics standards may cost in the range of $15,000. Printers  113  also use ink and paper that must be maintained and replaced that adds an additional maintenance expense. Furthermore, printers  113  have many moving parts and may easily break or wear out after repeated use. A typical life cycle for a printer  113  used in this capacity is about one year. Printers  113  within the system  100  for aircraft communications are inefficient and are a frequent cause of failure and downtime.  
       SUMMARY OF THE INVENTION  
       [0007]     According to one embodiment, a system and method is directed to providing a communication system for receiving data from sources outside the aircraft, storing the received information and then presented on a portable digital communication device having a display that may be read with the necessary information. The device is portable and may interfaced with a docking station for receiving the data from a communication management unit and then removed and passed freely among flight attendants or other personnel on the aircraft. Further, the device may be plugged into other docking stations in other parts of the plane to interface with the communication management unit for an update of received information or to recharge the unit&#39;s batteries.  
         [0008]     According to another embodiment, the device may be in communication with the central communication management unit continuously via a wireless communication connection. Furthermore, the device may include a display that is reversible such that the information may be displayed having a first side as a top side and then may be set for reverse display such that a second side, opposite the first side now becomes the top side with respect to the display. Such a reversible display, along with reciprocal control buttons on either side of the display allow user to switch between one-handed operation in the left hand and the right hand yet always have the display and respective control buttons comfortably accessible below the display. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0009]     The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:  
         [0010]      FIG. 1  shows a conventional communications system that includes a portable display device within an aircraft and aircraft support systems;  
         [0011]      FIG. 2  shows a communications system between an aircraft and aircraft support systems according to an embodiment of the invention;  
         [0012]      FIG. 3  shows an isometric view of a docking station for interfacing with the portable display device shown in  FIG. 2  according to an embodiment of the invention;  
         [0013]      FIG. 4  shows an isometric view in more detail of the portable display device of  FIG. 2  according to an embodiment of the invention; and  
         [0014]      FIG. 5  shows a top view of an aircraft having several docking stations as shown in  FIG. 3  for interfacing with the portable display device of  FIG. 4  according to an embodiment of the invention. 
     
    
     DETAILED DESCRIPTION  
       [0015]     The following discussion is presented to enable a person skilled in the art to make and use the invention. The general principles described herein may be applied to embodiments and applications other than those detailed above without departing from the spirit and scope of the present invention. The present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed or suggested herein.  
         [0016]      FIG. 2  shows a communications system  200  having a portable display device  250  enabled for use within an aircraft and aircraft support systems according to an embodiment of the invention. The communications system  200  may typically include an ACARS system  220 , a SatCom system  221  and a Telephony system  222  all of which may be configured to communicate with a central-aircraft communication system  210  according to known standards and protocols. The central-aircraft communication system  210  typically includes a communications management unit  211  that may, in turn, be configured to communicate not only with various external communications systems (such as ACARS  220  and so on) but also with a message display and entry device  212 . The communications management unit  211  may be configured for receiving various communications from the external communication systems mentioned above. Information received at the central-aircraft communication system  110  from any of these sources as well as others is typically assimilated and organized by the communication management unit  211 .  
         [0017]     A pilot or other aircraft personnel may interact with the communication management unit  211  via the message display and entry device  212  that is communicatively coupled to the communication management unit  211 . In this manner, the individual may step through all received information for display or manipulation according to known methods and established standards for any number of types of information. Typically, the message display and entry device  212  is anchored to the cockpit of the aircraft and is situated to be most accessible by the pilot(s). As such, other personnel may experience a difficult time reading information displayed on the message display and entry device  212 . As mentioned in the background, printers have provided a means for providing a portable copy of the needed information, but printers are expensive and unreliable.  
         [0018]     Thus, instead of having a printer, as was the case with a conventional system of  FIG. 1 , the central-aircraft communications system  210  of  FIG. 2  includes a portable display device  250  for receiving and displaying data. The portable display device  250  takes the place of a conventional printer  113  (shown in  FIG. 1 ) such that information may be called up and displayed on the portable display device  250  without having to print out a physical copy.  
         [0019]     Having a portable display device  250  for retrieving and displaying any number of kinds of information typically communicated to an aircraft provides numerous advantages over conventional printers. The use of a portable display device  250  with an electronic display that replaces an electro-mechanical printer on an aircraft eliminates the required upkeep and maintenance associated with the conventional printer. Furthermore, with no moving parts and/or ink cartridges and paper to replace, annual costs associated with the portable display device  250  are negligible. The portable display device  250  and its associated docking station (not shown in  FIG. 2 ) is also lighter and takes up less space than a conventional printer.  
         [0020]     Additionally, the portable display device  250  is configured to have all information stored electronically may be passed between different aircraft personnel who may easily call up and display any desired information as to their needs. As such, a flight attendant may call up gate change information, a mechanic may call up maintenance records, a co-pilot may call up an emergency checklist, etc. The portable display device  250  may also be used to store and organize messages on an aircraft between personnel.  
         [0021]     Further yet, the portable display device  250  with an electronic display may be used to record aircraft weight and balance data (i.e., occupied seats) and to transmit such information to a company dispatcher in an additional feature. Also, the portable display device  250  may provide a secure alternate communications links between the cockpit and the cabin crew using additional devices and docking stations (described below with respect to  FIG. 5 ). Displayable information typically includes flight status, flight changes, flight crew information, weather information, aircraft performance, aircraft maintenance, current events, emergency information, checklist information, passenger information, and airport information. Still further, the portable display device  250  may typically include a unique latching mechanism to hold the portable display device  250  in place during maneuvering acceleration and turbulence on an aircraft and have features of a hand-held device that allows use with one hand (unique hand grip and button placement).  
         [0022]      FIG. 3  shows an isometric view of a docking station  300  (sometimes called a receiver) for interfacing the portable display device  250  shown in  FIG. 2  with the communications management unit  211  according to an embodiment of the invention. The portable display device  250  may typically interface with the docking station  300  using an Ethernet connection, an RS-232 communications link, a USB-type communications link, a fire wire communication link or any other communications links commonly found in communications systems. In other embodiments, the docking station  300  is merely a cradle for storing and charging the batteries (not shown) of the portable display device  250  as communications between the portable display device  250  and the communications management unit  211  may be a wireless communication connection.  
         [0023]     The docking station  300  may be anchored in a position inside the cockpit of an aircraft but may be one of several docking stations  300  suitable for recharging and communicating with one or more portable display devices  250 . As such, an aircraft may have several docking stations  300  located throughout the aircraft such that a portable display device  250  may be “plugged in” at any number of locations throughout an aircraft for recharging and receiving information stored by the communication management unit  211 .  
         [0024]      FIG. 4  shows an isometric view in more detail of the portable display device  250  according to an embodiment of the invention. The portable display device  250  typically includes a large, flat-panel display  401  that provides a screen for displaying information received from the communication management unit  211 . The portable display device  250  also typically includes an interface (not shown in detail) for communicating with the central-aircraft communication system  210  that may be an RS-232 interface, a USB interface, a parallel port interface, a serial port interface, a fire wire interface, etc. In another embodiment, the portable display device  250  communicates with the central-aircraft communication system  210  via a wireless communication connection.  
         [0025]     The screen of the portable display device  250  may also be manipulated to display the messages from any perspective of a potential user. The portable display device  250  typically includes a manipulative display such that the display may be manipulated with respect to the direction in which the user is viewing the display. For example, when docked, the display  401  may display the information from the perspective of a user sitting to the left (for a pilot) or to the right (for a co-pilot, or from the perspective of a user standing between the pilots. A user may easily change the orientations of the screen with the push of a pre-assigned soft-key (described below).  
         [0026]     The portable display device  250  also typically includes a plurality of action and navigation buttons for manipulating the display to show various menus, options and information. As such, directional keys  402  are provided for maneuvering a cursor displayed on the display  401 . Further, programmable function soft-keys  403  may be provided to actuate various options and manipulation parameters. Additionally, other buttons  404  are provided to realize additional functionality, such as power on/off, brightness, backlight, reverse display, update information, etc. It is appreciated that one skilled in the art realizes that any number of functions may be realized via known programming standards and tenets such that any of the following descriptive functionality may be initiated, controlled, manipulated, and otherwise realized via the programmable buttons described above. A detailed account of specific button functionality will not occur except to the extent the exemplary possible functions of the portable display device  250  that are described below  
         [0027]     A typical portable display device  250  according to an embodiment of the invention may include the following features. Upon startup, the portable display device  250  may initiate a Power-Up Built In Test. Further, during operation a user may also begin a User-initiated Built In Test. Both tests are designed to run diagnostics to assure proper operation.  
         [0028]     When in an initial state, the display may show a hierarchical menu structure of functions in which a user may navigate. The menu choices include at least the following: 
        1. Receive New Message     2. Read Messages     3. Delete Message     4. File Message     5. Recover Deleted Message     6. Change Flight Crew     7. Find Message     8. Create Folders     9. Delete Folders     10. Download Folders     11. Format Display     12. Get Help     13. Configure Display        
 
         [0042]     These features are based a file management and page layout hierarchy that is well-known in the computer arts. A user may navigate through the menu and sub-menus using the directional keys and soft-keys described above.  
         [0000]     File Management  
         [0043]     Information received at a portable display device  250  is organized into files which are, in turn, organized into folders within the portable display device  250 . There are at least two default folders that are typically always available and not able to be deleted or renamed: (1) Current Messages and (2) Deleted Messages. Other folders may be created, renamed, or deleted according to the needs of a user and/or the capacity in which the portable display device  250  is being used. The user may perform any action (such as opening folders and files) through the directional keys and soft-keys that affect the display. In another embodiment, a remote dispatcher may initiate control the portable display device  250  via ACARS commands in which the user may choose to accept or reject upon receipt of the ACARS message. As such, folders and files are used to organize information in an intuitive manner in the form of pages.  
         [0000]     Page Layout  
         [0044]     The home page is typically the default page that is displayed when first using the portable display device  250 . The home page displays a list of top-level functions. In one embodiment, all functions are inoperative except messages. However, the default page when the portable display device  250  is removed from the docking station is typically a message list page for the Current Messages folder. The home page may further allow for a user to navigate to a plurality of additional pages.  
         [0045]     A Message List page is the default when the display is removed from the docking station. The soft-keys  403  on the left allow the user to take action on the message highlighted by the cursor. The directional keys  401  allow the user to move the cursor between messages and to the sorting fields at the top of the list. Pressing an enter key displays a new page having the selected message or folder.  
         [0046]     A Message page displays the contents of the folder shown in the top line. The default is to the Current Messages folder, which is where all newly received messages are stored. The new messages remain in this folder until deleted or moved to a different folder. A user may view multiple pages of the message using the up/down direction keys  401  or may view other messages in the folder using the left/right direction keys  401 .  
         [0047]     When the user selects a Store option while reading a message, a Store page is shown with available folders and other options. The user may navigate using directional/enter keys  401  to select a folder in which to store the message. When the desired folder has not been created yet, the user may select a Folders option to display a Folders page where new folders can be created or renamed or deleted. Once again, the user may navigate using the directional/enter keys  401  to view the Message List page for another folder. Adding new folders or renaming a folder takes the user to a page where alphanumeric characters can be selected from a list. Again, directional/enter keys  401  select characters from the list.  
         [0048]     When the user wants to search for a message the Display page shows a page with a list of all stored messages than can be sorted in various ways. For instance, pressing the TIME key sorts the list by time received. Again using the directional/enter keys  401  displays the selected message.  
         [0049]     As discussed above, various methods may be implemented by the portable display device  250 . Each of these are described in further detail as follows.  
         [0050]     Receive New Message  
         [0051]     Purpose: To demonstrate the ability to receive a new message from the Base Station.  
         [0052]     Precondition: Display contains 4-5 canned messages.  
         [0053]     Triggers: User places the Display in the base station.  
         [0054]     Basic Course: 
        1. Display lights the New Message indicator.     2. User removes Display from base station.     3. New Message indicator goes out.     4. Display shows the Message List page of the Current Message folder with a message retrieved from memory at the top of the list and the current time shown (the oldest unread message).        
 
         [0059]     Alternates: (none)  
         [0060]     Read Messages  
         [0061]     Purpose: To demonstrate the ability to scroll through a message and between messages on the Message List page.  
         [0062]     Precondition: Message List page contains several canned messages.  
         [0063]     Triggers: User navigates to the Message List page. 
        User removes Display from Base Station.        
 
         [0065]     Basic Course: 
        1. User presses Up or Down keys to scroll through a list of messages.     2. User presses Enter to show the Message page for the selected message.     3. User presses Up or Down keys to scroll through the message.     4. User presses Left or Right keys to scroll between messages.        
 
         [0070]     Alternates: (none)  
         [0071]     Delete Message  
         [0072]     Purpose: To demonstrate the ability to delete a message. The demo unit retains it in Deleted Messages folder.  
         [0073]     Precondition: Message page contains several canned messages. The Message page is displayed for any folder.  
         [0074]     Triggers: User selects the Delete option.  
         [0075]     Basic Course: 
        1. Display shows a dialog box asking the user to confirm the delete request.     2. User presses the Yes option.     3. Display moves the message to the Deleted Message folder.     4. Display shows the Message List page of the folder.        
 
         [0080]     Alternate 1: 
        5. If the Display is showing a message in the Deleted folder and the User selects the Delete option, the Display shows a dialog box with “Permanently delete this message?”    6. User selects Yes.     7. Display deletes message from Deleted Message folder.     8. Display shows the Message List page for the Deleted folder with the cursor at the first message on the page.        
 
         [0085]     Alternate 2: 
        9. In Step 6 User selects No.     10. Display shows Message page for Deleted folder with the same message in view.        
 
         [0088]     File Message  
         [0089]     Purpose: To demonstrate the ability to file a message to a folder. We assume there is a preamble to every message indicating the folder it should be stored in.  
         [0090]     Precondition: Message or Message List page is displayed and contains at least one message.  
         [0091]     Triggers: User selects the Store option.  
         [0092]     Basic Course: 
        1. Display shows the Store Message page with an icon of the message to be filed, and the appropriate folder highlighted.     2. User presses Directional keys to select the destination folder.     3. User presses Enter.     4. Display stores message in highlighted folder.     5. Display shows message icon disappearing into selected folder (or, just blink the folder 3 times).     6. Display shows Message page for Current Message folder.        
 
         [0099]     Alternate 1: 
        7. In Step 2 if User wants to create a new folder to store the message, User selects Folders option which activates the Create Folder use case.     8. When Create Folder is complete, User proceeds to Step 3.        
 
         [0102]     Recover Deleted Message  
         [0103]     Purpose: To demonstrate the ability to recover a deleted message.  
         [0104]     Precondition: A message is in the Deleted folder. The Folders page is shown.  
         [0105]     Triggers: User uses directional keys to highlight the Deleted folder.  
         [0106]     Basic Course: 
        1. User presses Enter key.     2. Display shows the Message List page for the Deleted Folder with the most recent message highlighted.     3. User presses Store key.     4. Display shows the Store Message page with the appropriate folder highlighted.     5. User uses directional keys to highlight the destination folder.     6. User presses Enter.     7. Display moves the message to the indicated folder and displays the Message List page for the Deleted folder.        
 
         [0114]     Alternates: 
        8. In Step 2 if there are no messages in the folder, the Display shows “(No Messages)”.        
 
         [0116]     Change Flight Crew  
         [0117]     Purpose: To demonstrate the ability for a new User to quickly delete all current messages plus all custom folders and contents, except those defined by the Dispatcher (uploaded by ACARS).  
         [0118]     Precondition: There is a folder created on this display that was not uploaded via ACARS.  
         [0119]     Triggers: User selects “Crew Change” option on Message or Message List page.  
         [0120]     Basic Course: 
        1. Display shows Folders page, with first custom folder highlighted, and a dialog box “Delete xxx folder and contents?” (“xxx” is the folder name).     2. Pilot selects Yes.     3. Display deletes folder and all contents (all content move to Deleted Messages folder).     4. Display highlights next custom folder and repeats Steps 1 &amp; 2 until none are left.     5. Display highlights Current Messages folder, with a dialog box “Delete all current messages?”    6. User selects Yes.     7. Display highlights Deleted Messages folder, with a dialog box “Permanently delete all messages?”    8. User selects Yes.     9. Display shows Message Page of Current Message folder with “(no messages)”.        
 
         [0130]     Alternates: 
        10. If in Step 2 User selects No, Display does not delete item and proceeds to next folder.     11. If in Step 5 User selects No, Display does not delete current messages and shows the Message page of the Current Message folder.        
 
         [0133]     Find Message  
         [0134]     Purpose: To demonstrate the ability to locate a message anywhere in memory. This may be by navigating manually through folders, or by a list of all message in memory. Messages are sorted in folders by time of receipt, most recent first.  
         [0135]     Precondition: Message page contains several canned messages. There are at least two other folders containing at least one message each.  
         [0136]     Triggers: (none).  
         [0137]     Basic Course: 
        1. User selects Message page.     2. Display shows Message page.     3. Use presses Left or Right directional keys to scroll between messages.     4. User selects Folders option.     5. Display shows Folders page with Current folder highlighted.     6. User uses directional keys to select a folder and presses Enter key.     7. Display shows Message page for that folder. The folder name is shown along the top of the page.        
 
         [0145]     Alternate 1: 
        8. User selects Find Message option on Folders page.     9. Display shows Find Message page, which is a list of all message in memory, plus several line select key options to sort by name, folder or receive time/date.     10. Display highlights the first message on the list.     11. User presses Up or Down keys to highlight the desired message.     12. User presses Enter key.     13. Display shows Message page of folder in which the message resides.        
 
         [0152]     Create Folder  
         [0153]     Purpose: To demonstrate the ability to create custom folders for sorting messages.  
         [0154]     Precondition: (none)  
         [0155]     Triggers: User selects Add Folder option.  
         [0156]     Basic Course: 
        1. Display shows Name Folder page with entry field for folder name and a list of characters allowed for naming.     2. User enters name for new folder by selecting characters from list using directional keys.     3. User selects Enter key.     4. Display shows a Folders page with all available folders.        
 
         [0161]     Alternate 1: 
        5. If in Step 2 the User decides not to create a new folder, he selects the Cancel option     6. Display shows the Folders page with all pre-existing folders.        
 
         [0164]     Delete Folder  
         [0165]     Purpose: To demonstrate the ability to delete folders.  
         [0166]     Precondition: (none)  
         [0167]     Triggers: (none)  
         [0168]     Basic Course: 
        1. User navigates to Folders page.     2. User uses directional keys to highlight a folder.     3. User selects Delete option.     4. Display shows a dialog box indicating number of messages in the folder, and asking the User to confirm the deletion of folder and all messages in the folder.     5. User selects Delete option.     6. Display deletes folder and all messages it contained from memory.     7. Display shows the Folders page with all available folders.        
 
         [0176]     Alternate 1: 
        8. If in Step 4 there are no messages in the folder, the Display deletes the folder and shows the Folders page with all remaining folders.        
 
         [0178]     Alternate 2: 
        9. If in Step 4 the User decides not to delete the folder, he selects the Cancel option.     10. Display shows a Folders page with all pre-existing folders.        
 
         [0181]     Download Folders  
         [0182]     Purpose: To demonstrate the ability to create custom folders via ACARS message. There are two options. In the first, the dispatcher creates one new folder “on the fly” by designating the new folder name in the preamble of the ACARS message. The Display creates the new folder as a result of the message being displayed. The second option is for the Dispatcher to create a complete new set of folders and erase the old ones.  
         [0183]     Precondition: Display is docked.  
         [0184]     Triggers: User presses TEST button three times within 2 seconds.  
         [0185]     Basic Course: 
        1. New Message indicator lights.     2. User removes display from base station.     3. New Message indicator light goes out.     4. Display shows Message page with new message. Message indicates it contains a new folder set, and contains user instructions for (a) add new folder(s) only, or (b) add new folders and delete all current folders and contents.     5. User follows instructions in the message to add new folders only (for instance, hold down two buttons at one time).     6. Display creates new folders and displays Folders page.        
 
         [0192]     Alternate 1: 
        7. If in Step 4 the User decides not to add the new folders, he does nothing.     8. Message remains on the Message page. User can return to this message any time and continue, or he can delete the message.        
 
         [0195]     Alternate 2: 
        9. If in Step 4 the User decides to replace the existing folders with the new ones and delete all current messages, he follows the given instructions.     10. Display deletes all current folders and contents, adds the new folders, and shows the Folders page with the new folder set.        
 
         [0198]      FIG. 5  shows a top view of an aircraft  500  having several docking stations of  FIG. 3  for interfacing with one or more portable display devices  250  of  FIG. 4  according to an embodiment of the invention. Although  FIG. 5  depicts an aircraft  500 , the communication system  550  of the present invention may be realized in any vehicle that may communicate via wireless transmissions with one or more communications systems based outside of the vehicle. For example, instead of an aircraft  500 , the communications system  550  described in various embodiments above may be employed in a ship, water-born vessel, spacecraft, car, truck, military craft or virtually any vehicle wherein communications may be used.  
         [0199]     As such, the communications system  550  (including both the on-board systems and the off-board systems) typically includes at least a first communication sub-system  501  located outside the aircraft  500 , such that the first communication sub-system  501  operable to communicate with the aircraft  500 . An example of the first sub-system  501  may be the ACARS system  220  depicted in  FIG. 2 . The overall system  550  further includes a second communication sub-system  502  located inside the aircraft  500  and operable to receive data from the first communication sub-system  501 . An example of the second sub-system  502  may be the central-aircraft communication system  210  also depicted in  FIG. 2 . Finally, the system  550  includes a portable display device  250  operable to removably interface with the second communication sub-system  502  and to receive and display the data received by the second communication sub-system  502 . As shown in  FIG. 5 , the interface may be one of a plurality of docking stations, such as a cockpit docking station  510 , a galley docking station  511  or an aft docking station  512 . Other locations and types of interfaces are contemplated, but not discussed herein for brevity.  
         [0200]     Each of the docking stations  510 ,  511 , and  512  may be typically communicatively coupled to the central-aircraft communication system  210  such that the portable display device  250  may operably interface with any docking station  510 ,  511 , or  512  to receive information communicated from the off-aircraft communication sub-system  501 . In an alternative embodiment, only the main docking station  510  in the cockpit may be communicatively coupled to the central-aircraft communication system  210  and each of the remaining docking stations  511  and  512  may be communicatively coupled just to the cockpit docking station and/or amongst each other. The communication coupling may typically be any standards often realized in an aircraft communications system, such as Ethernet or serial bus, but may also be any other commonly used medium and protocol, such as a wireless standard and protocol, for example.  
         [0201]     While the invention is susceptible to various modifications and alternative constructions, certain illustrated embodiments thereof are shown in the drawings and have been described above in detail. It should be understood, however, that there is no intention to limit the invention to the specific forms disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions, and equivalents falling within the spirit and scope of the invention.

Technology Classification (CPC): 7