Info on 727 Simulator

From:         rdd@cactus.org (Robert Dorsett)
Date:         03 Jun 93 02:58:22 PDT
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A few users have asked for more information on my 727 simulator, following
the blurb on comp.sys.mac.games.  So, here's some background.

The airplane modeled is a 727-200(ADV), without auxilliary fuel tanks.

    There are two distinct versions:
        1.  A *Systems* simulator.
        2.  A *Flight* simulator.

The systems simulator will mainly be of interest to 727 pilots, flight 
engineers, F/E wanna-be's, and aero-science schools, as a "review guide" 
(courtesy system synoptic displays), or as low-cost transport-category 
systems simulator.  In general, features include everything EXCEPT voice 
communications, lighting, oxygen masks, and manual cranks.  Minor interface 
changes have been made to adapt to the requirements of getting everything to 
work on a computer (e.g., sliders instead of knobs; square push-buttons 
instead of toggle-switches).

This version is nearing final (ultimate) release, late-June.  System 
performance is being constantly re-evaluated and validated, with the 
generous assistance and input of several pilots and technical personnel
from four carriers.


The flight simulator == the systems simulator, plus a 6 degree of freedom 
flight model, world-wide navaid database, additional interface features 
(flight planner, map mode), and a simple, 3D display (night view).  I plan
an August release.  This should be of interest to a wider market, including 
airliner enthusiasts, veteran simulator enthusiasts, airline-pilot wanna-
be's, etc.


The documentation is extensive, but won't teach users how to "fly."  There
are plenty of retail simulators that can do that.  The documentation is 
written for a user with a private pilot rating and some basic knowledge of 
IFR navigation, with specific "gotcha" pointers for professional users 
(i.e., discrepancies between the simulator and the Real Thing).  One major 
design objective is to be completely honest about the capabilities of the 
simulator; therefore, there will be no nonsensical or wishful claims 
of "realism."  

There will be two or three "tutorials" for the flight simulator version, 
guiding the user from takeoff through a coupled landing at a different 
airport.  These will be intended to introduce newcomers to the basic flow 
patterns of transport-category operations.


Both versions will sell for about $150.  The systems simulator will be
phased out when the flight simulator has been released, and there should
be a nominal upgrade fee (at cost).  

The target platform is the Mac; a PC (Windows) version of the systems 
simulator *may* be out this fall.



Specific features:

Systems Simulator
-----------------

    Requirements:
        2M on disk, 3M RAM partition.  
        Mac II-class machine or better.
        640 x 480 display (support 13" monitor in high-res mode)
        8-bit color (256 colors) or better
        Math co-processor NOT required.
    General
        Synoptic dialogs
        Day/night panel display mode.
        System snapshot-save capability.
        Point & click interface
        Four "panels."  (pilot, overhead, two flight engineer panels).
        Extensive documentation.
    Air conditioning & pressurization
        Automatic, manual, and standby modes.
        Faults.
    APU
        Start/shutdown
        Fire
        Electrical loading
        Pneumatics support
    Autopilot
        Place-holder, mainly.    
        Supports a simple "parametric flight" mode to illustrate the
            APD and provide some context for pressurization and airspeed
            warning system demonstration.
    Electrical system
        Battery
        AC generators
        APU
        Frequency control & faults
        Loading
        Synoptic dialog.
        External power
    Faults
        May be scheduled for random execution within 60 minutes.
        Engine failure, fire, separation, severe damage.
        Hydraulic A & B fluid loss/failure.
        Gear jam
        APU fire
        Wheel well fire
        T/R faults
        Generator faults:
            Instability
            Phase unbalance
            Differential
            Exciter ceiling protection
            Over/under excitation
            Over/under speed.
    Flight controls
        Alternate flaps
        Ground proximity warning system
        Airspeed warning system (A/B modes).
        Anti-ice
        Synoptic dialog.
    Fuel system
        Management
        Crossfeed
        Dumping.
        Icing.
        Synoptic dialog.
    Hydraulics
        A & B systems.
        Standby power.
        Alternate flaps.
        Proper electrical loading.
        Proper demand-loading as a function of gear or flap select.
        Control management.
        Accurate landing gear performance; wheel well fires.
        Synoptic dialog.
    Instruments
        Functioning airspeed/mach/vmo, altimeter, and vertical speed 
           indicators.
        Consolidated "ECAM" display (glass), designed to provide a monitoring
           capability from the pilot's panel.  This is divided into alert,
           flap, oil, and hydraulics pages.
    Pneumatics
        Ground cart                    
        APU support
        Engine support
        Air conditioning & pressurization support.
        Pack trips & faults.
    Powerplant
    Pratt & Whitney JT8D-15
        Start/shutdown
        All relevant device support.
        Failure/fire modes.
        Accurate run-time performance.
        Fire control.
        

The Flight Simulator
--------------------

    Requirements
        Same as Systems simulator, except:
            Floating-point chip required (tentative).
        4M RAM requirement.
        8M on disk.
    Systems
        Same as Systems Simulator.
    Autopilot
        Loosely based on Sperry SP-150
        Altitude hold/select
        Heading hold/select.
        Pitch hold.
        Glide slope/localizer tracking.
        VOR/localizer tracking.
        "Manual" mode.
        Approach Progress display.
        Autothrottle (tentative)
    Faults
        Same as Systems Simulator, plus:
            Reverser failure
            Runaway/jammed stabilizer
    Flight instruments
        Functioning additude-directional indicator (horizon)
        Flight director.
        Radio altimeter.
        Decision height annunciator & call-outs.
    Flight model
        6 degree-of-freedom flight model representative of a 727-class 
           airliner.
        Interactive, C*-derivative flight control law.
        Custom ground control laws.
    Interface
        Map position-set mode.
        Automatic flight plan generator (airways).
        Automatic V-speed call-outs.
        Debrief mode.
        Partial panel dialog
        ICAO 17 Simulator features (mainly various freeze modes).
        Position load/set independent of system states.
    Navigation database
        World-wide nav database.
        Around 6,000 navaids.
        About 4,000 runways.
        Most dense in the United States.
    Navigation instruments
        Horizontal situation indicator.
        Radio-magnetic indicator with superimposed VOR and ADF needles.
        Two DME displays.
        Coupled autopilot support.
    Visual
        Simple, light-point display.
        Runways and airport features only.  Perhaps shorelines, eventually.
    
    


---
Robert Dorsett
rdd@cactus.org
...cs.utexas.edu!cactus.org!rdd