FlightGear Flight Simulator/Technical/Property tree

The property tree is considered FlightGear's central nervous system and one of its representative assets.https://wiki.flightgear.org/Property_tree There is also a property browser for browsing and modifying all properties (which is also useful for singleplayer cheating). You can press the / key to open the property browser.https://wiki.flightgear.org/Property_browser Annunciators The /instrumentation/annunciators section shall provide a central place for aircrafts to write annunciator status data 3D aircraft models and external devices (like joysticks, yokes, throttle quadrants or custom made cockpit hardware) to read such data and drive status lights etc. Some of the props are automatically calculated by property rules in $FGDATA/Aircraft/Generic/generic-annunciators.xml (available since FG 2024.1) other properties have to be calculated by the actual aircraft. The aircraft.nas module provides aircraft.light which allows easy implementation of blinking lights. Such lights have a bool property 'state' which tells if the light is on or off./instrumentation/annunciators/doors /instrumentation/annunciators/master-caution/state # aircraft.light /instrumentation/annunciators/master-warning/state # aircraft.light /instrumentation/annunciators/autoflight/ap/enabled /instrumentation/annunciators/autoflight/ap/mode/alt /instrumentation/annunciators/autoflight/ap/mode/apr /instrumentation/annunciators/autoflight/ap/mode/hdg /instrumentation/annunciators/autoflight/ap/mode/ias /instrumentation/annunciators/autoflight/ap/mode/nav /instrumentation/annunciators/autoflight/ap/mode/rev /instrumentation/annunciators/autoflight/ap/mode/vs /instrumentation/annunciators/autoflight/flightdirector/enabled /instrumentation/annunciators/engines/ /instrumentation/annunciators/engines/apu/enabled /instrumentation/annunciators/engines/apu/fire # summary props, 'sum' of all engines /instrumentation/annunciators/engines/fire /instrumentation/annunciators/engines/oil-pressure-low /instrumentation/annunciators/engines/starter # for <gear-name> in {nose, left, right} /instrumentation/annunciators/gear/<gear-name>/down /instrumentation/annunciators/gear/<gear-name>/in-transition /instrumentation/annunciators/gear/<gear-name>/unsafe /instrumentation/annunciators/gear/<gear-name>/up # gear summary /instrumentation/annunciators/gear/down /instrumentation/annunciators/gear/in-transition /instrumentation/annunciators/gear/unsafe /instrumentation/annunciators/gear/up /instrumentation/annunciators/gear/parking-brake /instrumentation/annunciators/systems/anti-ice/enabled /instrumentation/annunciators/systems/fuel/aux-pump /instrumentation/annunciators/systems/fuel/pressure-low /instrumentation/annunciators/systems/fuel/system[]/pressure-low /instrumentation/annunciators/systems/hyd/pressure-low /instrumentation/annunciators/systems/hyd/system[]/pressure-low /instrumentation/annunciators/systems/vacuum Consumables See also #Fuel /consumables/fuel/tank[%d]/level-lb /consumables/fuel/tank[%d]/level-lbs /consumables/fuel/tank[%d]/level-gal_us /consumables/fuel/tank[%d]/capacity-gal_us /consumables/fuel/tank[%d]/density-ppg /consumables/fuel/total-fuel-lbs /consumables/fuel/total-gal_us Controls These properties are meant to represent the various cockpit controls (levers, switches, buttons, etc.). Consider these as the pilots input. Recommended usage Animation of control elements (levers, switches, etc) themself in the 3D model of the cockpit As input to aircraft system simulation, e.g. hydraulics or electrical systems Avoid refering to control props directly for animating parts of the 3D model if there is an aircraft system (electric, hydraulic, ...) involved. Better use XML property rules (e.g. logic or filter) that calculate the component state from /controls/foo as well as "power available", "component is serviceable" etc. Anti-ice These properties control the various anti-ice properties that may be present in an aircraft. /controls/anti-ice/wing-heat /controls/anti-ice/pitot-heat /controls/anti-ice/wiper /controls/anti-ice/window-heat /controls/anti-ice/engine[%d]/carb-heat /controls/anti-ice/engine[%d]/inlet-heat APU These properties control any auxiliary power unit, in essence a small turbine engine driving generators, hydraulic pumps etc. before and after the aircraft's engines are up an running. /controls/APU/off-start-run /controls/APU/fire-switch Armament /controls/armament/master-arm /controls/armament/station-select /controls/armament/release-all /controls/armament/station[%d]/stick-size /controls/armament/station[%d]/release-stick /controls/armament/station[%d]/release-all /controls/armament/station[%d]/jettison-all Autoflight These properties control the autopilot on certain airplanes. /controls/autoflight/autopilot[%d]/engage /controls/autoflight/autothrottle-arm /controls/autoflight/autothrottle-engage /controls/autoflight/heading-select /controls/autoflight/altitude-select /controls/autoflight/bank-angle-select /controls/autoflight/vertical-speed-select /controls/autoflight/speed-select /controls/autoflight/mach-select /controls/autoflight/vertical-mode /controls/autoflight/lateral-mode Electric Control elements for electrical systems like battery, generators/alternators, avionics etc. /controls/electric/battery-switch /controls/electric/external-power /controls/electric/APU-generator /controls/electric/engine[%d]/generator /controls/electric/engine[%d]/bus-tie /controls/electric/avionics[%d] /controls/electric/APU-generator should be aliased to /controls/electric/engine[%d]/generator (where %d is the index of the engine representing the APU) by the aircraft code. Engines Engines are numbered engine[0] for a single engine to engine[0] to engine[3] for a 747 for example. (The model allows for up to 12 engines rumour has it ;-) /controls/engines/throttle_idle /controls/engines/engine[%d]/throttle /controls/engines/engine[%d]/starter /controls/engines/engine[%d]/fuel-pump /controls/engines/engine[%d]/fire-switch /controls/engines/engine[%d]/fire-bottle-discharge /controls/engines/engine[%d]/cutoff /controls/engines/engine[%d]/mixture /controls/engines/engine[%d]/propeller-pitch /controls/engines/engine[%d]/magnetos /controls/engines/engine[%d]/boost /controls/engines/engine[%d]/WEP /controls/engines/engine[%d]/cowl-flaps-norm /controls/engines/engine[%d]/feather /controls/engines/engine[%d]/ignition /controls/engines/engine[%d]/augmentation /controls/engines/engine[%d]/afterburner /controls/engines/engine[%d]/reverser /controls/engines/engine[%d]/water-injection /controls/engines/engine[%d]/condition Flight controls These properties control the flight controls surfaces, though often through a mechanical, analog or digital flight control system (FCS) that may or may not be modeled. /controls/flight/aileron /controls/flight/aileron-trim /controls/flight/elevator /controls/flight/elevator-trim /controls/flight/rudder /controls/flight/rudder-trim /controls/flight/flaps /controls/flight/slats /controls/flight/BLC // Boundary Layer Control /controls/flight/spoilers /controls/flight/speedbrake /controls/flight/wing-sweep /controls/flight/wing-fold /controls/flight/drag-chute The positions of the controls are usually put in /surface-positions/ at the discretion of the aircraft designer. These usually drive the animations of the control surfaces. They are either normalized (like /surface-positions/elevator-pos-norm) or in degrees, and sometimes the aileron is split left/right. Fuel /controls/fuel/dump-valve /controls/fuel/tank[%d]/fuel_selector /controls/fuel/tank[%d]/to_engine /controls/fuel/tank[%d]/to_tank /controls/fuel/tank[%d]/boost-pump[%d] Gear /controls/gear/brake-left /controls/gear/brake-right /controls/gear/brake-parking /controls/gear/steering // Used if rudder is not sufficient for control of steering /controls/gear/gear-down /controls/gear/antiskid // Deprecated? /controls/gear/tailhook /controls/gear/tailwheel-lock /controls/gear/wheel[%d]/alternate-extension Hydraulics /controls/hydraulic/system[%d]/engine-pump /controls/hydraulic/system[%d]/electric-pump Lights /controls/lighting/landing-lights /controls/lighting/turn-off-lights /controls/lighting/formation-lights /controls/lighting/taxi-light /controls/lighting/logo-lights /controls/lighting/nav-lights /controls/lighting/beacon /controls/lighting/strobe /controls/lighting/panel-norm /controls/lighting/instruments-norm /controls/lighting/dome-norm Pneumatic /controls/pneumatic/APU-bleed /controls/pneumatic/engine[%d]/bleed Pressurization /controls/pressurization/mode /controls/pressurization/dump /controls/pressurization/outflow-valve /controls/pressurization/pack[%d]/pack-on Seat /controls/seat/vertical-adjust /controls/seat/fore-aft-adjust /controls/seat/cmd_selector_valve /controls/seat/eject[%d]/initiate /controls/seat/eject[%d]/status Engines Common /engines/engine[%d]/fuel-flow-gph /engines/engine[%d]/fuel-flow_pph /engines/engine[%d]/thrust_lb /engines/engine[%d]/running /engines/engine[%d]/starter /engines/engine[%d]/cranking /engines/engine[%d]/fire Turbine /engines/engine[%d]/n1 /engines/engine[%d]/n2 /engines/engine[%d]/epr /engines/engine[%d]/augmentation /engines/engine[%d]/water-injection /engines/engine[%d]/ignition /engines/engine[%d]/nozzle-pos-norm /engines/engine[%d]/inlet-pos-norm /engines/engine[%d]/reversed /engines/engine[%d]/cutoff Piston /engines/engine[%d]/mp-osi /engines/engine[%d]/egt-degf /engines/engine[%d]/oil-temperature-degf /engines/engine[%d]/oil-pressure-psi /engines/engine[%d]/cht-degf /engines/engine[%d]/rpm Propeller /engines/engine[%d]/rpm /engines/engine[%d]/pitch /engines/engine[%d]/torque Flight Dynamics Model Position This will return the current position of the aircraft within FlightGear. This is also the stuff that is transmitted in multiplayer. /position/ /position/altitiude-ft () /position/altitude-agl-ft (22.46983965) /position/altitude-ft (28.24368289) /position/ground-elev-ft (-0.43513529) /position/ground-elev-m (-0.1326292364) /position/latitude-deg (37.61371436) /position/latitude-string (37*36 49.4N) /position/longitude-deg (-122.3576508) /position/longitude-string (-122*21 27.5W) /position/sea-level-radius-ft (20899648.76) Orientation /orientation/roll-deg /orientation/pitch-deg /orientation/heading-deg /orientation/roll-rate-degps /orientation/pitch-rate-degps /orientation/yaw-rate-degps /orientation/side-slip-rad /orientation/side-slip-deg /orientation/alpha-deg Velocities /velocities/airspeed-kt /velocities/mach /velocities/speed-north-fps /velocities/speed-east-fps /velocities/speed-down-fps /velocities/uBody-fps /velocities/vBody-fps /velocities/wBody-fps /velocities/vertical-speed-fps /velocities/glideslope Acceleration /accelerations/nlf /accelerations/ned/north-accel-fps_sec /accelerations/ned/east-accel-fps_sec /accelerations/ned/down-accel-fps_sec /accelerations/pilot/x-accel-fps_sec /accelerations/pilot/y-accel-fps_sec /accelerations/pilot/z-accel-fps_sec Gear /gear/serviceable /gear/gear[%d]/cast-angle-deg // The angle of the wheel where 0 is pointing straight forward /gear/gear[%d]/compression-m /gear/gear[%d]/compression-norm /gear/gear[%d]/ground-friction-factor /gear/gear[%d]/ground-is-solid /gear/gear[%d]/has-brake /gear/gear[%d]/rollspeed-ms // Speed of the wheel's rotation in meters per second /gear/gear[%d]/wow // Weight-on-wheel /gear/gear[%d]/xoffset-in /gear/gear[%d]/yoffset-in /gear/gear[%d]/zoffset-in Instrumentation /instrumentation/adf[%d]/ /instrumentation/airspeed-indicator/ /instrumentation/altimeter/ /instrumentation/annunciator/ /instrumentation/attitude-indicator/ /instrumentation/clock/ /instrumentation/comm[%d]/ /instrumentation/dme/ /instrumentation/efis/ /instrumentation/encoder/ /instrumentation/flightdirector/ /instrumentation/gps/ /instrumentation/gps-annunciator/ /instrumentation/heading-indicator/ /instrumentation/heading-indicator-fg/ /instrumentation/magnetic-compass/ /instrumentation/marker-beacon/ /instrumentation/nav[%d]/ /instrumentation/radar/ /instrumentation/slip-skid-ball/ /instrumentation/tacan[%d]/ /instrumentation/transponder/ /instrumentation/turn-indicator/ /instrumentation/vertical-speed-indicator/ /instrumentation/wxradar/ Instrumentation ADF /instrumentation/adf[%d]/adf-btn /instrumentation/adf[%d]/bro-btn /instrumentation/adf[%d]/display-mode /instrumentation/adf[%d]/enroute-timer/running /instrumentation/adf[%d]/enroute-timer/start-time /instrumentation/adf[%d]/enroute-timer/time /instrumentation/adf[%d]/error-deg /instrumentation/adf[%d]/flight-timer/running /instrumentation/adf[%d]/flight-timer/start-time /instrumentation/adf[%d]/flight-timer/time /instrumentation/adf[%d]/flt-btn /instrumentation/adf[%d]/frequencies/dial-1-khz /instrumentation/adf[%d]/frequencies/dial-100-khz /instrumentation/adf[%d]/frequencies/selected-khz /instrumentation/adf[%d]/frequencies/standby-khz /instrumentation/adf[%d]/frq-btn /instrumentation/adf[%d]/ident /instrumentation/adf[[%d]/ident-audible /instrumentation/adf[%d]/in-range /instrumentation/adf[%d]/indicated-bearing-deg /instrumentation/adf[%d]/mode /instrumentation/adf[%d]/model /instrumentation/adf[%d]/operable /instrumentation/adf[%d]/power-btn /instrumentation/adf[%d]/right-display /instrumentation/adf[%d]/rotation-deg /instrumentation/adf[%d]/serviceable /instrumentation/adf[%d]/set-btn /instrumentation/adf[%d]/volume /instrumentation/adf[%d]/volume-norm Instrumentation NAV radio /instrumentation/nav[%d]/audio-btn /instrumentation/nav[%d]/back-course-btn /instrumentation/nav[%d]/cdi/serviceable /instrumentation/nav[%d]/crosstrack-error-m /instrumentation/nav[%d]/crosstrack-heading-error-deg /instrumentation/nav[%d]/data-is-valid /instrumentation/nav[%d]/dme-in-range /instrumentation/nav[%d]/filtered-cdiNAV0-deflection /instrumentation/nav[%d]/filtered-gsNAV0-deflection /instrumentation/nav[%d]/frequencies/dial-khz /instrumentation/nav[%d]/frequencies/dial-mhz /instrumentation/nav[%d]/frequencies/is-localizer-frequency /instrumentation/nav[%d]/frequencies/selected-mhz /instrumentation/nav[%d]/frequencies/selected-mhz-fmt /instrumentation/nav[%d]/frequencies/standby-mhz /instrumentation/nav[%d]/frequencies/standby-mhz-fmt /instrumentation/nav[%d]/from-flag /instrumentation/nav[%d]/frq-swap-btn /instrumentation/nav[%d]/gs/serviceable /instrumentation/nav[%d]/gs-direct-deg /instrumentation/nav[%d]/gs-distance /instrumentation/nav[%d]/gs-in-range /instrumentation/nav[%d]/gs-needle-deflection /instrumentation/nav[%d]/gs-needle-deflection-deg /instrumentation/nav[%d]/gs-needle-deflection-norm /instrumentation/nav[%d]/gs-rate-of-climb /instrumentation/nav[%d]/gs-rate-of-climb-fpm /instrumentation/nav[%d]/has-gs /instrumentation/nav[%d]/heading-deg /instrumentation/nav[%d]/heading-needle-deflection /instrumentation/nav[%d]/heading-needle-deflection-norm /instrumentation/nav[%d]/ident /instrumentation/nav[%d]/ident-audible /instrumentation/nav[%d]/in-range /instrumentation/nav[%d]/nav-distance /instrumentation/nav[%d]/nav-id /instrumentation/nav[%d]/nav-id_asc1 /instrumentation/nav[%d]/nav-id_asc2 /instrumentation/nav[%d]/nav-id_asc3 /instrumentation/nav[%d]/nav-id_asc4 /instrumentation/nav[%d]/nav-loc /instrumentation/nav[%d]/operable /instrumentation/nav[%d]/power-btn /instrumentation/nav[%d]/radials/actual-deg /instrumentation/nav[%d]/radials/reciprocal-radial-deg /instrumentation/nav[%d]/radials/selected-deg /instrumentation/nav[%d]/radials/target-auto-hdg-deg /instrumentation/nav[%d]/radials/arget-radial-deg /instrumentation/nav[%d]/serviceable /instrumentation/nav[%d]/signal-quality-norm /instrumentation/nav[%d]/slaved-to-gps /instrumentation/nav[%d]/time-to-intercept-sec /instrumentation/nav[%d]/to-flag /instrumentation/nav[%d]/to-from/serviceable /instrumentation/nav[%d]/volume Instrumentation Tacan /instrumentation/tacan[%d]/display/channel /instrumentation/tacan[%d]/display/x-shift /instrumentation/tacan[%d]/display/y-shift /instrumentation/tacan[%d]/frequencies/selected-channel /instrumentation/tacan[%d]/frequencies/selected-channel[1] /instrumentation/tacan[%d]/frequencies/selected-channel[2] /instrumentation/tacan[%d]/frequencies/selected-channel[3] /instrumentation/tacan[%d]/frequencies/selected-channel[4] /instrumentation/tacan[%d]/frequencies/selected-mhz /instrumentation/tacan[%d]/ident /instrumentation/tacan[%d]/in-range /instrumentation/tacan[%d]/indicated-bearing-true-deg /instrumentation/tacan[%d]/indicated-distance-nm /instrumentation/tacan[%d]/indicated-ground-speed-kt /instrumentation/tacan[%d]/indicated-time-min /instrumentation/tacan[%d]/name /instrumentation/tacan[%d]/serviceable /instrumentation/tacan[%d]/switch-position Rotors (YASim only) /rotors/gear/torque-sound-filtered // Unused? /rotors/gear/total-torque /rotors/{name}/balance /rotors/{name}/blade[%d]/flap-deg /rotors/{name}/blade[%d]/incidence-deg /rotors/{name}/blade[%d]/position-deg // Position relative to model /rotors/{name}/bladesvisible // Used for animations /rotors/{name}/cone%d-deg //e.g. cone-deg or cone2-deg /rotors/{name}/roll-deg /rotors/{name}/rpm /rotors/{name}/stall /rotors/{name}/stall-filtered /rotors/{name}/tilt /rotors/{name}/torque /rotors/{name}/yaw-deg https://wiki.flightgear.org/Aircraft_properties_reference References