Shuttle: The Space Flight Simulator - Manual
The instructions to SHUTTLE
To move around the screens, press E to scroll down, X to scroll
up, S to scroll right, and D to scroll left.
For those running Space Shuttle without a mouse, the above mouse
controls can be emulated by the keyboard as follows: to operate
the switches, use the Shift and Home keys together to simulate the
left mouse button, and Shift and Pg Up for the right button. USing
Shift together with the keypad cursor keys [2,4,6,&8] emulates
the pointer movement. Thus all mouse functions described above
can be emulated by using these keys.
Once in the simulator, you can scroll around your chosen panels
simply by moving the mouse: when the pointer comes to the edge of
the screen, the screen will scroll in that direction.
To move the switches wither up or down, or from left to right,
click the left mouse button for up,or left, or the right mouse
button for down, or to move the mouse to the right. Where a switch
has more than 2 settings, continue to click the button in the
Clicking the left and right mouse buttons simultaneously brings up
the menu bar, while clicking them again removes it.
Finally, when in the PANEL OVERVIEW view, clicking the right mouse
button scrolls you round the different views, while the left button
selects the one you are currently on.
GAME RUNNING ICON:
This appears whenever you are running the simulator, and denotes that
it is in progress. Occasionally other symbols will flash inside this
'/' - Time Running
'M' - Message on Teleprinter from Ground Control - press f7 to read
'S' - Time Skip facility is in operation
'T' - Time Advance facility is in operation
When you pause the game, whichever of these symbols is on the screen at
the time will flash
Now select NEXT MISSION from the MISSIONS menu, and you'll see the text
for the first mission. Select ACCEPT, if you want to accept it, and
you'll find yourself already in the air, watching the 747, with the
Shuttle on top, just before separation. From here on in, you have to
guide the Orbiter down to a safe landing. Once this mission is
successfully completed, you'll be able to select the next mission,
TEST LAUNCH KENNEDY, which will allow you to go through the whole
Before starting the mission, go back to the game Set Up option, select
start position, then select Launch Pad, then click DONE, and you're
ready to start the mission. Select NEXT MISSION from the main menu,
skip past the mission text as before, and you'll find yourself
looking at the Orbiter sitting on the launch pad.
Now you have 2 Options:
1. sit and wait while it goes through proper pre-launch countdown,
which takes 5 hours!
2. simply set the SKIP facility(within the Windows Menu Option). This
can also be done with the Orbiter menu within the Main Menu. Set it
to a time just before launch, i.e., T-30 seconds, then select
Time Skip from the ACTIONS menu. Next select SKIP within the
ACTIONS menu, and it will take you to the required point. This
will take time, of course, but the view is worth the wait. The
Orbiter is now about to launch-the rest is up to you!
NORMAL KEYS (without SHIFT, CTRL, or ALT
CURSOR UP Pitch Down
CURSOR DOWN Pitch Up
CURSOR LEFT Roll Left
CURSOR RIGHT Roll Right
' Yaw Left
. Yaw Right
E Move Up Across Panel
X Move Down Across Panel
S Move Left Across Panel
D Move Right Across Panel
F Use Front RHC
A Use aft RHC
P Pause the game
T Time Advance the game
-/= Speed Brake/Throttle Control
 Move Selected Joint
RETURN Grab payload using RMS
DELETE Release Grabbed Payload
SPACE Moves around panels in PANEL OVERVIEW.
Keys With SHIFT held down:
Home Left Mouse Button
PgUp Right Mouse Button
CUR UP Move Pointer Up
CUR DOWN Move Pointer Down
CUR LEFT Move Pointer Left
CUR RIGHT Move Pointer Right
Keys With ALT held down:
P Toggle "Game Running" icon ON/OFF
 Slow Movement of RMS joint @ 0.2
CUR UP -Z Translates SHUTTLE
CUR DOWN +Z Translates SHUTTLE
CUR LEFT -Y Translates SHUTTLE
CUR RIGHT +Y Translates SHUTTLE
+ +X Translates SHUTTLE
- -X Translates SHUTTLE
Keys Used on the Numeric Keypad:
+/- Scroll through display on Aft CRT
Home Camera Roll Left
End Camera Roll Right
PgUp Camera Pitch Up
PgDn Camera Pitch Down
Ins Camera Yaw Left
Del Camera Yaw Right
CONTROL Key Sequences:
Control C + Y Turn The Cursor On
C + N Turn The Cursor Off
Control F + Y Turn Sound On
F + N Turn Sound Off
Control G + A Arm Landing Gear
G + D Drop Landing Gear
Control H + 1 Full On Auto
H + 2 First Simulation
H + 3 First Command
H + 4 Veteran
H + 5 Fully Manual
H + 0 Automatic Selection
Control J + 1 Select Shoulder Yaw
J + 2 Select Shoulder Pitch
J + 3 Select Elbow Pitch
J + 4 Select Wrist Pitch
J + 5 Select Wrist Yaw
J + 6 Select Wrist Roll
Control L + S Save log File
Control P + F GoTo Front Panel
P + A GoTo Aft Panel
P + C GoTo Center Panel
P + L GoTo Left Panel
P + R GoTo Right Panel
P + O GoTo Overhead Panel
P + M GoTo Right-aft Panel
P + N GoTo Lower-aft Panel
P + H Slow Sown Panel Movement(use up to 3 times)
P + J Speed Up Panel Movement
Control Q + Y Quit To Main Menu
Q + N Return To Simulator
Q + D Return To DOS
Control S + T Start Time Skip
S + P Start Time Skip and pause when finished
S + C Turn Off Comms.
Control T + T Time Advance
T + P Time Advance and Pause
Control W + T Open Time Advance Window
W + S Open Time Skip Window
W + D Open Time of Day Window
W + M Open MET Window
W + C Open Detail Complexity Window
W + G Open Ground View Window
W + H Open Help Level Window
W + L Open Log Options Window
No shift/ctrl/alt: SHIFT +: ALT +:
f1 Last Panel Select Panel
f2 Left HUD Right HUD
f3 Left Window Right Window
f4 Left AFT Right AFT
f5 Left Payload Bay Right Payload Bay
f6 Inside MMU Release MMU Attach MMU
f7 Mission Control Text External Tank View
f8 Ground View Sel Ground View Roaming MMU View
f9 CCTV View Crawler View 747 View
f10Roaming Camera Left SRB Camera Right SRB View
U Pitch Up
N Pitch Down
H Roll Left
J Roll Right
B Yaw Left
M Yaw Right
ALT + U -Z Translate
ALT + N +Z Translate
ALT + H -Y Translate
ALT + J +Y Translate
ALT + B -X Translate
ALT + M +X Translate
Space Shuttle is controlled by 2 menu systems, the MAIN MENU, for all
applications prior to launch, and the SIMULATOR MENU, for all in-flight
operations. Both menu bars appear at the top of the screen. The MAIN
MENU contains information that will be useful in familiarizing you with
the Space Shuttle and its systems, and to help you choose the level of
customizing you require, as well as Launch and Landing Sites and the
The first menu option contains 4 further sub-options:
1. ABOUT SPACE SHUTTLE
Gives the publishing and development credits for SPACE SHUTTLE
2. RUNNING DEMO
This takes you straight to the launch pad, where you're taken
through a typical mission that demonstrates the many different
functions and aspects of SPACE SHUTTLE. In this demo, you'll see
the Orbiter launch init orbit and deploy a satellite. This demo
lasts for about 15 minutes and allows you just to sit back and watch.
To access this demo, first load up the game as detailed above. To
bypass the loading screen, hit the space bar(or click the left mouse
button). Now, select RUNNING DEMO from the ORBITER menu at the
opening screen and sit back and watch the shuttle launch and deploy
its satellite. To quit the demo, press ESC to access the
SIMULATOR MENU, then select MISC, and then QUIT TI MAIN MENU. This
will take you back to the main menu.
3. GAME SET UP
This feature allows you to customize the various aspects of the
game. This has 6 further options within it, which appear in a
window called "SELECT WINDOW" whenever you select "GAME SETUP".
From here, by selecting with the mouse and then clicking on the
OPEN icon, you go to the following:
This feature brings up another window that allows you to start
either from VAB [Vehicle Assembly Building] ROLLOUT, i.e., right
from the beginning, LAUNCH PAD, IN-ORBIT or LANDING. You click
on the required button, then remove this second window by
clicking on the box in the top left hand corner.
TIMER ADVANCE: Clicking on TIMER ADVANCE first brings another
window onto the screen, in which are two options:
ADVANCE BY - This feature allows you to move to any point in
the simulator you want: just type in the required time. When
When the simulator is started, you'll see a letter "T" in the
GAME RUNNING ICON that denotes that the simulator is now in
TIME ADVANCE mode. While in this mode, the simulator pauses
until it finds the required point. When it has done so, the
letter "T" will disappear, and you'll be returned to normal
real time. The time advance will stop, however, if a message
comes up for an in-flight operation to be carried out.
DISPLAY RATE: This feature allows you to customize the rate at
which the view is updated. For instance, if you type in
10 MINUTES, then every new frame you'll see will be points 10
minutes apart. Of course, these views wouldn't change at this
speed in real time, only within the simulator.
TIME SKIP SET: This differs form TIMER ADVANCE, above, only in
that it simply allows you to jump to a designated point in the
mission. Selecting this option brings up another window, in which
a box marked 'ADVANCE TO' appears, set out in hours, minutes and
second. Below this are two icons marked 'T+', meaning time after
lift off, and 'T-' meaning time before lift off.
To reach a set point in time within the mission, simply select "t-'
or 'T+' and type in the required time. The simulator will then time
advance until it has reached this point, skipping though time at a
rate of approximately one minute of simulator time to one second of
DETAIL COMPLEXITY: This feature allows you to set the map and/or the
shape complexities. In each case, a choice of levels is offered. The
choice of complexities will of course effect the speed of the simulator.
HELP LEVEL: This sets the level of communications between you and the
computes, with the following choices:
These help levels range from NOVICE to EXPERIENCED VETERAN with the
most guidance offered at the FULL-ON AUTO level.
SET TIME OF DAY: This brings up a window of the same title, inside
which are two main boxes, each with times in hours and minutes,
entitled 'TIME OF DAY' and 'LENGTH OF DAY'.
TIME OF DAY allows you to set the time of day, based on Eastern
Daylight Time, to whatever you required. This can come in useful,
for example, if you're on the dark side of the planet trying to
retrieve a satellite - setting the time to daylight hours in this
instance would be extremely useful!
LENGTH OF DAY allows you to determine how long a day within the
simulator takes in real time. For example, setting this to one
minute, say, means that the Earth then rotates once a minute, i.e.
you'll see 30 seconds of light and 30 seconds of darkness every
minute of the mission.
4. QUIT: Enables you to exit SPACE SHUTTLE. THE SIMULATOR. note:
pressing ESC while in the MAIN MENU also exits the program.
2. LOG: This menu provides you with many facilities both before,
during and after missions. If you go straight into a mission without
creating your own log, and then use the Log Save option once in flight,
your log will be saved out as 'Vektor Graphix Ltd"
"LOG" contains several options which enable you to maintain a
1. NEW LOG: Enables you to enter in your name as you're given command
of a space shuttle orbiter for the first time. After you've entered
your name, your log is cleared and all subsequent missions will have
their details logged.
You can save your log on auto or manual by pressing th appropriate
button on this panel: auto means that the log is saved automatically,
and manual allows you to save the log at any time you want, using
the in-flight simulator menu log save facility.
Finally, when you insert your name in the box provided, it is always
done in over-write mode, i.ie, whatever you type in will automatically
type over anything that is there already.
2. RELOAD: Enables you to reload a previously saved log from disk.
Selecting this option brings up a window title 'SELECT LOG FILE', which
contains a list of all previously saved logs. Beneath this are two icons
'ABORT', which takes you back to the MAIN MENU and 'LOAD' to load an
old log, simply select the one required from the list and then
press 'LOAD'. This will then take you straight into the selected log. If
a mission was in progress at the time the log was saved, the the
mission is continued from that point.
3.INFO: This feature gives you information about the space shuttle itself.
with a sub-menu containing many of the orbiter's different aspects
for further on-screen information.
Click on the required section, and a screen of illustrations and infor-
mation comes on screen. At the bottom of these screens are three
icons, in the form of book pages. These allow you scroll forwards,
backwards, and return to the MAIN MENU.
4.SITES: This selection gives you two further options:
LAUNCH SITES: Allows you to see the two launch sites, KENNEDY SPACE
CENTER, or VANENBURG AIR FORCE BASE, in a short demo that zooms in
from orbit down to the site in question. To return o the menu screen,
simply press the ESCAPE key.
LANDING SITES: This selection shows the two landing sites, KENNEDY SPACE
CENTER and the primary site, EDWARDS AIR FORCE BASE, in th same way as
the launch sites, by way of a short demo, which can be quit in the
5.MISSIONS: This feature allows you to select which mission you wish
to perform. When you start with a new Commander, the only option
available at the beginning is NEXT MISSION. Selecting this displays the
mission objectives of the next full mission on the screen. Press 'ACCEPT'
to start the mission, or 'ABORT' to cancel. During a full mission,
Mission Control will expect you to be familiar enough with the shuttle to
respond to their commands.
As with all the missions in SPACE SHUTTLE THE SIMULATOR the first thing
you see after selecting this mission is a page of mission text. At the
bottom of the page are two buttons; 'ACCEPT', which you select to
start the mission and 'ABORT' which take you back to the MAIN MENU.These
icons don't appear if you're re-playing a mission.
This first training mission is entitled ALT  MISSION and in it
you'll launch from the back of a 747 transport plane near the
glideslope for an unpowered landing ad Edwards Air Force Base.
WARNING: on this first test mission, almost all the controls are set
for you when on Full-ON Auto. However, the LANDING GEAR isn't
so don't forget to put it down! You will also be requested to turn on
the Heads Up Displays.
After completing this first mission, you'll see a screen entitled MIS-
SION OBJECTIVES, which tells you how you fared in the mission.
When you click on OK at this screen, you're returned to the Main menu.
Selecting missions again either allows you to run the mission again,
either for fun or because you just failed it, or to continue on to the
Once a full mission has been successfully completed, it objectives
will be added to the Mission menu so that you can re-attempt a
similar mission at any time in the future As you become more experi-
enced as a commander, Mission Control will select you for more
SIMULATOR MENU: This menu is split into six categories:
1.ACTIONS: This menu allows you access to various primary in-flight
PILOT'S HUD with this feature you can turn the pilot's heads up display
on or off without having to go to the respective panel.
COMMANDER'S HUD does the same as the above for the commander's hud.
TIMER ADVANCE allows you mouse access to this facility, offering two
Advance - activates the facility according to the limits you've
set Advance, Pause to Next Comms - activates the timer advance,
but only as fas the next communications from Ground Control, at
which point it resumes the normal countdown.
TIME SKIP similar to TIMER ADVANCE, this feature gain offers two sub- options:
Skip - sets the pre-determined skip facility running
(see main menu, game set up, time skip above)
Skip, Pause - skips to the predetermined time, then pauses until
you're ready to continue
Turn Off Comms - does just that. But beware, this is NOT for
turning off the teleprinter. Using this switch means that you will
no longer get any communications from Ground Control and therefore
means that you'll have no idea of what you're supposed to be doing.
It also means that you cannot switch them back on again.
REQUEST MISSION COMMS: All missions within SPACE SHUTTLE begin after T+55
minutes. By this point, you'll have successfully launched the shuttle
into orbit, and prepared it for the mission. NOw go to the ACTION menu
select REQUEST MISSION COMMS, and up they'll come, telling you
everything you need to know about the progress of the mission. If you
select this before you're at the right point in time, the comms will
tell you you don't need them just yet.
REQUEST LANDING COMMS: Once your mission is complete, you'll be ready
to return home. As with the mission comms above, go to the ACTION menu.
select REQUEST LANDING COMMS and they will appear. As above if you
select them before time, you'll be told politely that they're not
quite necessary yet.
2.PANELS: This is a quick way for you to get to the panel you want
quickly [or to locate a particular panel if you're not sure where it is,
of course] Under this heading is the following list of panels:
RIGHT AFT PANEL
LOWER AFT PANEL
The last of these Overviews takes you to a series of diagrammatic
representations of the orbiter's operating stations. There are five of
these that may be seen from the pilot's point of view. Move the cursor
around this and you'll find that the different panels are highlighted
as you go over them. Click on the required panel with the left mouse
button and you'll be taken to it straight away. Use the right mouse
button or space bar to go to the next Overview screen: Once the last on
has been displayed, it starts again at the beginning.
3.GO TO: This is similar to 'PANELS' above, except that GOTO offers you
more detailed lists of the orbiter's available functions. For instance,
pilot's instrument power, anti-skid light and so on.
4.WINDOWS: This allows you access to all the various in-game set up
windows available within the MAIN MENU. These are as follows:
TIME OF DAY
MET - Short for MISSION ELAPSED TIMER, this brings up a window
showing the time elapsed so far on the current mission.
This can be moved to any desired point on the screen
simply by clicking and holding the mouse pointer onto the
top of the window and moving it around. To remove the MET
simply click on the small box in the top left hand corner
of the window.
FIXED VIEWS - Brings up a window with a list of all the different
fixed views available - note that these are not
available in orbit
Once you have chosen a view, pressing F8 will select
the chosen view as the default for the F8 key for
the rest of your current stay within SPACE SHUTTLE
HELP LEVEL - Help levels cannot be increased once a simulation has
been started. Help levels can only be reduced during
an ongoing simulation.
LOG OPTIONS - Brings up a window of the same name. The 'AUTO' log
save time feature will allow you to set the time
that the log is saved, i.e. every 5 minutes, every
10 minutes and so on. Of course, this only applies
if you choose to have th log saved automatically. At
the bottom of the window are three buttons.
M - MANUAL LOG SAVE
A - AUTO LOG SAVE
OK - quits the window
If you wish to save any new configuration, you must
use the OK button - clicking the CLOSE WINDOW button
at the top of the box will simply abandon any
changes you might have made
5. VIEWS- Gives a submenu of all the different viewpoints available.
selecting any one of them will take you to the viewpoint.
QUIT TO DOS
This section gives a description of, and any necessary background to
each and every part and function of the Space Shuttle. The reference
section is split into 3 major activities, LAUNCH, ON ORBIT OPERATIONS,
AND LANDING, with each aspect of the shuttle being covered under that
section for which it has the most relevance. In the case of an item being
equally as important to more than one stage of the Shuttle's activities,
we have given the full description and background, where applicable, in
the first such occurance.
SUMMARY OF PANELS:
The controls and instrumentation of the real Space Shuttle are
understandably complex. SPACE SHUTTLE accurately reproduces the
layout and functions of all of the genuine shuttle controls.
The FLIGHT DECK is split into 2 main stations:
The FORWARD station, at which are seated the Commander[right] and the
The AFT Station, from which the RMS is controlled during orbit.
The instrument panels are labeled according to their positions:
F front PANEL
O overhead PANEL
L left PANEL
R right PANEL
C center PANEL
A aft PANEL
M right aft PANEL
N lower aft PANEL
F2 Commander's Control Panel - CSS/AUTO buttons, Speed Brak
F3 HUD Power, Trim Controls
F4 Pilot's Control Panel - as F2
F6 Commander's Main Panel - Landing Gear,Direction Altitude etc
F7 CRT Main Panel, pressure gauges
F8 Pilot's Main Panel - as F6
L1 Fire Suppressio
L2 Nose Wheel Steering, Anti-Skid Controls & Life Suppor
C2 Keypads, CRT Control
C3 DAP, SRB/ET Sep, Air Data probe controls etc.
R1 Power Distribution
R2 APU/Hydraulics/ET Umbilical
R12 Keypad/CRT, fuel/water
R13L PLB/MMU/KU antenna
O1 GPC Status, Pressure/Temps
O3 RCS/OMS Pressure, Timers
O5 Pilot's Communication Controls
O6 GPC's, Star Tracker
O7 Tacan, RCS
O8 Radar Altimeter, OMS
O9 Commander's Communication Controls
A3 CCTV Monitors
A6 Orbital DAP
A7 Video Control, RHC
A8 RMS Controls
A14 RMS Arm and KU Antenna jettison controls
WATER SPRAY BOTTLES:
These are located in the aft fuselage of the Orbiter, and are used to
cool down the power unit, lube oil, and hydraulic systems during both
the ascent and de-orbit phases. There are 3 boilers in all, and they
store water in a bellows-type storage tank pressurized by gasseous nitrogen.
Along with 3 APUs and the hydraulic pumps, the water spray boilers are
in operation 5 minutes before take-off, although the boilers are
pre-activated 45 minutes before this. One of these boilers is also briefly
opened one day before de-orbit during a flight control system check out.
BOILER N2 Supply 1/2/3 [PANEL R2] - controls the nitrogen shut off valves,
which maintain water pressure in the boilers.
APU Fuel/H2O QTY [PANEL F8] - allows the water quantity of each boiler to
be displayed on the 1/2/3 METERS on the same panel.
1/2/3 [PANEL R2] -
i] Operates the two boiler controllers. When the relevant switch is at
position A, the A Controller for that boiler is powered, and likewise
for position B. When at OFF, electrical power is removed from both
ii] Operates the electrical heaters when in orbit to prevent water freeze
up in orbit. The heaters apply to the same boilers as do the power
switches, and the access method is also the same.
1/2/3 [PANEL R2] - enables the relevant controller selected by the
previous switch. When enabled, the READY signal appears on the
corresponding APU/HYD READY TO START talkback indicator on PANEL R2, as
long as the following has been actioned: N2 shut-off valve is opened,
steam vent nozzle temperature is >130F, and the hydraulic fluid bypass
valve is in the correct position with regard to the hydraulic fluid
Problems - As the boilers and heaters are immediately concerned with
the smooth running of the APU's on ascent, you must check to make
certain that they are reading and operating correctly at all times.
Once the pilot has initiated the pre-start sequence, he confirms that
the water spray boilers are activated before he does anything else. At
T - 5 minutes the pilot starts the 3 power units by setting the APU CNTL
switches to START/RUN and checking the hydraulic pressure gauges for an
indication of approximately 600 - 1000 psi. He then pressurizes the main
pump and looks for about 3000 psi on the gauges. All 3 hydraulic main
pump pressures must be greater than 2800 psi by T - 4 minutes or the
automatic launch sequence will abort the launch! This is not
something that the pilot can do anything about, of course, and the
Shuttle must be returned for a complete check over.
CRT DISPLAY SYSTEM:
The MCDS on the Orbiter crew compartment flight deck allows onboard
monitoring of Orbiter systems, computer software processing, and
manual control for flight crew data and software manipulation. The
system is composed of 3 types of hardware: display electronic units[DEUs],
display units that include the CRTs, and keyboard units, which together
communicate with the GPCs over the display/keyboard data bus network.
The MCDS provides almost immediate response to flight crew inquiries
through displays, graphs, trajectory plots, and predictions about flight
progress. The crew controls the vehicle system operation through the use
of keyboards in conjunction with the display units.
Three keyboards are located on the flight deck: two on the left and
right sides of the flight deck center console [PANEL C2] and one on
the flight deck at the side aft flight station [PANEL R12]. Depending
on crew requirements and preferences, each of the front keyboards can
communicate with any of the front DEUs: the aft keyboard, however, is
only wired to display on the aft DEU.
Problems - If the CRTs go, there is little the crew can do about it.
The likelihood of all of them going at once is extremely remote. The
only thing the crew can do to replace a blown CRT with one of the
others - i.e., if one of the front CRTs went, the crew could replace
it with the aft one. This simulator is not, for obvious reasons, able
to recreate this emergency.
GENERAL PURPOSE COMPUTERS [GPCs]:
Almost all of the operations carried out by the Space Shuttle are
controlled or overseen by the main computer system. The DPS [Data
Processing System] consists of 5 general purpose computers [GPCs]
connected to the many hundreds of feedback censors and actuators
throughout the Shuttle. These are each made up of a Central
Processing Unit [CPU] and an input/output processor [IOP], and each
of the 5 do a different job. All five are IBM Ap-101 computers, and
contain a memory area for storing data and software. They are
collectively referred to as Shuttle's Main Memory, into which are
loaded all the flight and operational informational systems. The
system software controls the computer systems and monitors
communication between them. It also supports the user interface
modules to provide interaction with the crew.
The application software consists of specific modules to manage
navigation and control at various stages of the mission. Each
major module of operations or OPS has a number associated with it:
OPS 1 Ascent
OPS 2 On Orbit
OPS 3 Reentry
OPS 4 Orbit Operations
OPS 6 RTLS [loaded along with OPS 1]
OPS 8 On Orbit Checkout
OPS 9 Computer Utilities
Each major OPS also has a particular CRT display associated with it.
GPC POWER ON/OFF [PANEL 06] - First of all you have to turn things on.
These switches are guarded, as, for one, they control 600 watts of
power each, and moreover the GPCs should not be able to be turned off
GPC OUTPUT [PANEL 06] - has three positions: BACKUP, NORMAL & TERMINATE.
BACKUP is only used for the GPC containing the BFS, which stops it
being used until needed; All switches for operating GPCs will be set at
NORMAL, whereas the GPCs controlling systems management [i.e., on-orbit
operations} will be positioned at TERMINATE, as they shouldn't be
commanding anything during the flight phases.
MODE [PANEL 06] - three positions" RUN, STBY & HALT. Normally if these
switches are put into HALT in the RUN position, the software is precluded
from operating. However, if the switches are put into STBY, the software
can still not be executed, but the GPC is in a software controlled state.
Normal practice is to go from HALT to STBY and then to RUN, and vice
versa, as this gives the software a chance to ready and clean itself up.
ORBITER FLIGHT COMPUTER SOFTWARE - refers to all the various software
commands that are typed in at the relevant moment by the flight crew.
PROBLEMS - If the main GPC fails, the shuttle has its own backup flight
system, or BFS, which is loaded into the GPCs and the mass memory unit.
As it's only concerned with the emergency ascent, insertion into orbit
or de-orbit of the shuttle, it has a great deal less information stored
although any of the GPCs could become a BFS if necessary. Remember, GPC 5
must be switched on at the pre-launch phase, otherwise the shuttle won't
Other than this, however, for the purposes of SPACE SHUTTLE - THE
SIMULATOR, the BFS won't be operable.
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