<!-- AVIONICS-NARRATIVE:START -->
## The aircraft that is made of decisions
Avionics is the least visible half of an aeroplane and, since roughly the 1970s, the half where the hard problems live. The airframe question -- can this shape carry this load at this speed -- was largely settled by the end of the piston era. What replaced it is a different question: given imperfect sensors, finite computing, a crew with finite attention and an environment actively trying to corrupt your memory, what should the aircraft DECIDE, and who gets the final word?
That last clause is the real subject. Every system in this room is an argument about authority. The autopilot holds the aircraft on a path until the crew takes it back. Fly-by-wire interposes a computer that will refuse a demand it considers dangerous, and different manufacturers drew that line in genuinely different places. The collision-avoidance system will override a controller's instruction, and it took a mid-air collision to make that rule unambiguous. Terrain warning fires whether or not anybody asked it to. None of these are conveniences bolted onto flying; they are a negotiated settlement about who commands the aircraft in the seconds that matter.
The second thread is that none of it is trustworthy by default. Sensors lie, position fixes drift, databases contain errors, and cosmic rays flip bits in memory that is otherwise in perfect health. Avionics engineering is largely the discipline of building dependable behaviour out of undependable parts -- by voting, by cross-checking, by degrading in announced stages rather than failing silently.
## Seven machines, from surface to silicon
<!-- SECTIONSIMS:BEGIN g34 2026-09-19 - microsims the articles linked here play; generated by _tools/generate/g34_portal_section_sims.py; do not hand-edit inside -->
*Microsims from the articles this section links:*
<div class="wt-simrow">
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/Fly-by-wire.html" data-title="Fly-by-wire"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/Autopilot.html" data-title="Autopilot"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/Head-up_display.html" data-title="Head-up display"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/Radio_navigation.html" data-title="Radio navigation"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/Radiation_hardening.html" data-title="Radiation hardening"></div>
</div>
<!-- SECTIONSIMS:END -->
Each of the seven three.js microsims in this room isolates one of those arguments and lets you run it.
**[[Fly-by-wire]]** removes the cable. The stick no longer commands a surface deflection; it commands a load factor or a roll rate, and the computer works out the deflection that delivers it. Hold the stick still and the aircraft holds a steady g, not a steady surface angle. Then push past the alpha limit and watch the demand get clipped -- and step down through normal, alternate and direct law to watch the protections disappear one tier at a time. Fail the redundant channels one by one and the voter carries on until too few remain.
**[[Autopilot]]** is the cascade. A fast inner loop holds attitude, a slower outer loop holds heading and altitude, a slower one still steers to the path. The timescale separation is not a style choice -- collapse it and the stack goes unstable. Raise the outer gain and the aircraft begins to hunt; add actuator lag and oscillation appears from nothing but lost phase margin. The flight mode annunciator shows armed versus captured throughout, because mode confusion is a recognised accident category rather than a UI quibble.
**[[Head-up_display]]** is about registration. Symbology collimated to optical infinity stays locked to the outside world; the flight path vector sits exactly where the aircraft is actually going, which in a crosswind is emphatically not where the nose is pointing. Switch collimation off and eight centimetres of head movement smears the symbology against the world by degrees -- which is the entire reason a HUD is not merely a screen near the windscreen.
**[[Traffic_alert_and_collision_avoidance_system]]** thinks in seconds, not miles. Tau -- time to closest approach -- drives the alert, which is why a slow convergence up close can be legal and a fast one further out is not. The centrepiece is coordination: two equipped aircraft negotiate over the Mode S link so their advisories are complementary, one climbing, one descending. Switch coordination off and watch both pick the same sense and defeat the protection. That is the Ueberlingen mechanism, and it is why the rule is now unambiguous that the crew follows the advisory over the controller.
**[[Terrain_awareness_warning_system]]** is the difference between looking down and looking ahead. Reactive ground-proximity warning measured the ground directly below and inferred danger from closure rate, which arrives far too late against a cliff. Add a terrain database and compare it against the predicted flight path, and the warning comes tens of seconds earlier. The sim measures that gap directly -- against a cliff the lead grows from about four seconds to over a minute -- and then shows the failure path, because the database is only ever as good as the position fix feeding it.
**[[Radio_navigation]]** is position as pure geometry. A bearing is a plane, a range is a sphere, a time difference is a hyperbolic sheet, and a fix is where the surfaces cross. The payoff is slant range: fly directly over a DME at 30,000 ft and it reads about five miles, because you are five miles above it. Spread the stations badly and the same measurement accuracy yields a smeared fix -- dilution of precision drawn as a shape rather than quoted as a number.
**[[Radiation_hardening]]** closes on the hardware itself, and on the failure mode that has nothing to do with wear. A single ion punches a track through the die, deposits charge, and flips a bit -- no damage, just wrong data. Fly the die higher and toward the pole and the rate climbs; trigger a solar particle event and it spikes. Then switch on error correction and triple modular redundancy and watch the UNCORRECTED rate collapse while the particles keep arriving. Hardening never stops the particles. It stops upsets from becoming failures.
## How to read 167 children
The tree below is machine-harvested from the live Wikipedia article and alphabetical -- exhaustive, and unreadable in the way exhaustive lists are. Most entries fall into one of five bands.
There is **sensing**: radar in its many forms, infrared search and track, radio and satellite navigation, inertial systems, air data, lightning detection. There is **the buses and the boxes** -- ARINC 429 and 664, MIL-STD-1553, CAN, integrated modular avionics, the unglamorous plumbing that decides what can talk to what. There is **the crew interface**: glass cockpit, head-up and helmet-mounted displays, annunciation, and the human-factors literature that grew up around them. There is **protection**: collision avoidance, terrain awareness, envelope protection, flight recorders, and the certification machinery such as DO-178C that governs software allowed to fly. And there is **the environment**: cosmic rays, solar events, radiation hardening, operating temperature, and the physics that treats avionics as a target.
One caution carried over from the room's own scaffold: most entries below are intentional forward-references, not built pages. They render as links because the tree is real; the articles behind them mostly are not written yet. Treat the list as a map of the territory and a backlog, not as an index of existing content.
<!-- AVIONICS-NARRATIVE:END -->
<!-- SECTIONSIMS:BEGIN g34 2026-09-19 - microsims the articles linked here play; generated by _tools/generate/g34_portal_section_sims.py; do not hand-edit inside -->
*Microsims from the articles linked below:*
<div class="wt-simrow">
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Integrated_modular_avionics.html" data-title="Integrated modular avionics"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Airband.html" data-title="Airband"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Automatic_Dependent_Surveillance–Broadcast.html" data-title="Automatic Dependent Surveillance–Broadcast"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Pitot–static_system.html" data-title="Pitot–static system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Inertial_navigation_system.html" data-title="Inertial navigation system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Global_Positioning_System.html" data-title="Global Positioning System"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Instrument_landing_system.html" data-title="Instrument landing system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Flight_instruments.html" data-title="Flight instruments"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/FADEC.html" data-title="FADEC"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Aircraft_fuel_system.html" data-title="Aircraft fuel system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Traffic_collision_avoidance_system.html" data-title="Traffic collision avoidance system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Terrain_awareness_and_warning_system.html" data-title="Terrain awareness and warning system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Flight_recorder.html" data-title="Flight recorder"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Weather_radar.html" data-title="Weather radar"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Airborne_wind_shear_detection_and_alert_system.html" data-title="Airborne wind shear detection and alert system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Flight_management_system.html" data-title="Flight management system"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Link_16.html" data-title="Link 16"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Radar.html" data-title="Radar"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Sonobuoy.html" data-title="Sonobuoy"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Forward-looking_infrared.html" data-title="Forward-looking infrared"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/Radar_warning_receiver.html" data-title="Radar warning receiver"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/flight/MIL-STD-1553.html" data-title="MIL-STD-1553"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/electronics/Resistor.html" data-title="Resistor"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/electronics/Capacitor.html" data-title="Capacitor"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/electronics/Inductor.html" data-title="Inductor"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/electronics/Diode.html" data-title="Diode"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/electronics/Transistor.html" data-title="Transistor"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/electronics/Alternating_current.html" data-title="Alternating current"></div>
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/electronics/Electric_motor.html" data-title="Electric motor"></div>
</div>
<!-- SECTIONSIMS:END -->
<!-- GIFPLATE:BEGIN v1.0 g16 — room plate pending; pick a Commons animation and verify its licence with g17_gif_verify.py on a networked lane. Do not hand-edit inside. -->
## Images
*Room plate for [[Avionics]] pending — no Commons establishing shot has been selected yet. This is a live worklist item, not an error: run `g16` to choose a plate and `g17_gif_verify.py` (networked lane) to verify its licence before it renders here.*
<!-- GIFPLATE:END -->
The canonical spine of [[Avionics]]: the full tree-verified child structure of the [[Electronics|electronic]] systems flown aboard [[Aircraft|aircraft]] and spacecraft — [[Radar|radar]], [[Autopilot|autopilot]], [[Fly-by-wire|fly-by-wire]], the [[Glass_cockpit|glass cockpit]], [[Satellite_navigation|satellite]] and [[Inertial_navigation_system|inertial]] navigation, the [[ARINC|ARINC]] and [[MIL-STD-1553|MIL-STD-1553]] data buses, [[Integrated_modular_avionics|integrated modular avionics]], and the [[Traffic_alert_and_collision_avoidance_system|collision-avoidance]] and [[Terrain_awareness_warning_system|terrain-awareness]] systems that keep it safe, out to spaceborne [[Astrionics|astrionics]]. Every entry below is a child of this hub's live Wikipedia article, publishable to Obsidian as the scaffold for route objects keyed to this hub.
## Crosslinks
Doors to adjacent rooms: [[PORTAL_Aviation]] for the [[Aircraft|aircraft]] these systems fly in; [[PORTAL_Signal_Processing]] for the [[Radar|radar]], [[Radio_navigation|radio-navigation]] and modulation underneath; [[PORTAL_Control_theory]] for [[Autopilot|autopilot]] and [[Fly-by-wire|fly-by-wire]] control law; [[PORTAL_Physics]] for the sensing physics; and [[PORTAL_Reliability_engineering]] for [[DO-178C|DO-178C]] and the safety case behind flight software.
<!-- NOTE 2026-08-05: seven Avionics three.js sims added to _3d_deploy_stage/ (Fly-by-wire, Autopilot,
Head-up_display, Traffic_alert_and_collision_avoidance_system, Terrain_awareness_warning_system,
Radio_navigation, Radiation_hardening). Re-run g13 to regenerate the gallery below; the current
entries predate them. -->
<!-- SIMGALLERY:BEGIN v1.0 g13 — generated iframe set; do not hand-edit inside -->
## Play every microsim on this page
<p class="microsim-gallery-note">Every microsim linked from this portal, embedded live. <strong>9 players</strong> — 5 threejs · 4 p5js.</p>
<ul class="microsim-gallery">
<li class="microsim-card" data-lib="threejs">
<iframe src="https://wikitube-3d-microsims.netlify.app/polytope4d.html" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Four-dimensional polytopes — threejs microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/WT!Three_js_Microsim_Master_Class">Four-dimensional polytopes</a></div><div class="ms-sub">threejs · <a href="https://wikitube-3d-microsims.netlify.app/polytope4d.html" target="_blank" rel="noopener">open full-screen</a> · on <a href="https://en.wikitube.io/wiki/WT!Three_js_Microsim_Master_Class">Three.js Microsim Master Class</a></div></div>
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<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/WT!Three_js_Microsim_Master_Class">Klein bottle</a></div><div class="ms-sub">threejs · <a href="https://wikitube-3d-microsims.netlify.app/Klein_bottle.html" target="_blank" rel="noopener">open full-screen</a> · on <a href="https://en.wikitube.io/wiki/WT!Three_js_Microsim_Master_Class">Three.js Microsim Master Class</a></div></div>
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<iframe src="https://wikitube-3d-microsims.netlify.app/Platonic_solid.html" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Platonic solids — threejs microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/WT!Three_js_Microsim_Master_Class">Platonic solids</a></div><div class="ms-sub">threejs · <a href="https://wikitube-3d-microsims.netlify.app/Platonic_solid.html" target="_blank" rel="noopener">open full-screen</a> · on <a href="https://en.wikitube.io/wiki/WT!Three_js_Microsim_Master_Class">Three.js Microsim Master Class</a></div></div>
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<iframe src="https://editor.p5js.org/sciencenibber/full/90jeLsBsW" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Acoustic wave — p5js microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/WT!P5_js_Microsim_Master_Class">Acoustic wave</a></div><div class="ms-sub">p5js · <a href="https://editor.p5js.org/sciencenibber/full/90jeLsBsW" target="_blank" rel="noopener">open in the p5 editor</a> · on <a href="https://en.wikitube.io/wiki/WT!P5_js_Microsim_Master_Class">p5.js Microsim Master Class</a></div></div>
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<iframe src="https://editor.p5js.org/sciencenibber/full/tHGSVAofH" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Aliasing — p5js microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/WT!P5_js_Microsim_Master_Class">Aliasing</a></div><div class="ms-sub">p5js · <a href="https://editor.p5js.org/sciencenibber/full/tHGSVAofH" target="_blank" rel="noopener">open in the p5 editor</a> · on <a href="https://en.wikitube.io/wiki/WT!P5_js_Microsim_Master_Class">p5.js Microsim Master Class</a></div></div>
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<iframe src="https://editor.p5js.org/sciencenibber/full/3joGGd1vg" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Alternating current — p5js microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/Alternating_current">Alternating current</a></div><div class="ms-sub">p5js · <a href="https://editor.p5js.org/sciencenibber/full/3joGGd1vg" target="_blank" rel="noopener">open in the p5 editor</a></div></div>
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<iframe src="https://editor.p5js.org/sciencenibber/full/HVNGd9nMv" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Histogram — p5js microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/WT!P5_js_Microsim_Master_Class">Histogram</a></div><div class="ms-sub">p5js · <a href="https://editor.p5js.org/sciencenibber/full/HVNGd9nMv" target="_blank" rel="noopener">open in the p5 editor</a> · on <a href="https://en.wikitube.io/wiki/WT!P5_js_Microsim_Master_Class">p5.js Microsim Master Class</a></div></div>
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<iframe src="https://wikitube-3d-microsims.netlify.app/Air_traffic_control.html" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Air Traffic Control — threejs microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/Air_traffic_control">Air Traffic Control</a></div><div class="ms-sub">threejs · <a href="https://wikitube-3d-microsims.netlify.app/Air_traffic_control.html" target="_blank" rel="noopener">open full-screen</a></div></div>
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<iframe src="https://wikitube-3d-microsims.netlify.app/Helicopter.html" loading="lazy" frameborder="0" sandbox="allow-scripts allow-same-origin" title="Helicopter: dissymmetry of lift — threejs microsim"></iframe>
<div class="ms-meta"><div class="ms-title"><a href="https://en.wikitube.io/wiki/Helicopter">Helicopter: dissymmetry of lift</a></div><div class="ms-sub">threejs · <a href="https://wikitube-3d-microsims.netlify.app/Helicopter.html" target="_blank" rel="noopener">open full-screen</a> · on <a href="https://en.wikitube.io/wiki/Helicopter">Helicopter</a></div></div>
</li>
</ul>
<!-- SIMGALLERY:END -->
<!-- CRAFT-LINK:START g12 -->
**Craft standard:** Both craft standards apply here — [[WT!Three_js_Microsim_Master_Class|three.js]] and [[WT!P5_js_Microsim_Master_Class|p5.js]].
<!-- CRAFT-LINK:END -->
<!-- SECTIONSIMS:BEGIN g34 2026-09-19 - microsims the articles linked here play; generated by _tools/generate/g34_portal_section_sims.py; do not hand-edit inside -->
*Microsims from the articles linked below:*
<div class="wt-sim" data-src="https://wikitube-3d-microsims.netlify.app/thury/Turbulence.html" data-title="Turbulence"></div>
<!-- SECTIONSIMS:END -->
<!-- TREEGEN:BEGIN v1.4 src=_registry/linktree/Avionics.json harvested=2026-08-05T14:26:20Z children=167 — generated by g01_hub_portals.py; do not hand-edit inside this block -->
## Canonical link structure — 167 tree-verified children
Hub article: [[Avionics]] · tree harvested 2026-08-05T14:26:20Z · every entry below is in this hub's harvested
child tree (v09-gated). Unbuilt links are intentional forward-refs: the populate scaffold.
**A** — [[ACARS]] · [[Acronyms_and_abbreviations_in_avionics]] · [[ADS-B]] · [[Aerial_reconnaissance]] · [[Africa]] · [[Airband]] · [[Airborne_early_warning]] · [[Airborne_radio_relay]] · [[Airbus_A350]] · [[Airbus_A380]] · [[Aircraft]] · [[Aircraft_Data_Network]] · [[Aircraft_Electronics_Association]] · [[Aircraft_heading]] · [[Airliner]] · [[Air_defense]] · [[Air_navigation]] · [[Air_traffic_control]] · [[Air_traffic_management]] · [[Alternating_current]] · [[Amplitude_modulation]] · [[Anti-submarine_warfare]] · [[ARINC]] · [[ARINC_429]] · [[ARINC_629]] · [[ARINC_664]] · [[Arinc_708]] · [[ARINC_717]] · [[ARINC_825]] · [[ASTOR]] · [[Astrionics]] · [[Autopilot]] · [[Aviation_Week_&_Space_Technology]] · [[Avidyne_Corporation]] · [[Avionics_Full-Duplex_Switched_Ethernet]] · [[Avionics_software]] · [[Avionic_bay]]
**B** — [[Bendix_Aviation]] · [[Boeing_777]] · [[Boeing_787]] · [[Boeing_Starliner]] · [[Bowman_(communications_system)]] · [[Business_aviation]]
**C** — [[CAN_bus]] · [[Cathode_ray_tube]] · [[Clear-air_turbulence]] · [[Cockpit]] · [[Collins_Aerospace]] · [[Commercial_Standard_Digital_Bus]] · [[Controlled_flight_into_terrain]] · [[Coronal_mass_ejection]] · [[Cryptography]]
**D** — [[Dipping_sonar]] · [[Direct_current]] · [[DO-178C]]
**E** — [[E-3D]] · [[Electronics]] · [[Electronic_counter-countermeasures]] · [[Emergency_locator_beacon]] · [[Emergency_position-indicating_radiobeacon]] · [[Environmental_Control_and_Life_Support_System]] · [[European_Geostationary_Navigation_Overlay_Service]]
**F** — [[Federal_Aviation_Administration]] · [[Flight_control_surfaces]] · [[Flight_recorder]] · [[Fly-by-wire]] · [[Forward_looking_infrared]] · [[Fourth_generation_jet_fighter]]
**G** — [[Galactic_cosmic_rays]] · [[Garmin]] · [[General_aviation]] · [[GE_Aviation_Systems]] · [[Glass_cockpit]] · [[GPS]] · [[Ground-proximity_warning_systems]] · [[Grumman_F-14_Tomcat]] · [[Gulfstream_Aerospace]]
**H** — [[Head-up_display]] · [[Health_and_usage_monitoring_systems]] · [[Helicopter]] · [[Honeywell_Aerospace]]
**I** — [[IEEE_1394b]] · [[India]] · [[Inertial_navigation_system]] · [[Infrared_search_and_track]] · [[Instrument_meteorological_conditions]] · [[Integrated_modular_avionics]] · [[Israel_Aerospace_Industries]]
**J** — [[Joint_Planning_and_Development_Office]] · [[JSTARS]] · [[JTRS]]
**L** — [[Lawrence_Sperry]] · [[Leonardo_(company)]] · [[Life-support_system]] · [[Lightning_detector]] · [[Link_11]] · [[Link_16]] · [[Link_22]] · [[Local-area_augmentation_system]] · [[LORAN]]
**M** — [[Magnetron]] · [[McDonnell_Douglas_F-15E_Strike_Eagle]] · [[Merlin_HM_Mk_1]] · [[MIL-STD-1553]] · [[MIL-STD-1760]] · [[Military_aircraft]] · [[Morse_code]]
**N** — [[Navigational_aid]] · [[NEXRAD]] · [[Next_Generation_Air_Transportation_System]] · [[Nimrod_MRA4]]
**O** — [[Operating_temperature]] · [[Orion_(spacecraft)]]
**P** — [[Panasonic_Avionics_Corporation]] · [[Parker_Aerospace]] · [[Parker_Hannifin]] · [[Passive_infrared_sensor]] · [[Philip_J._Klass]] · [[Police_helicopter]] · [[Portmanteau]]
**R** — [[Radar]] · [[Radiation_hardening]] · [[Radiotelegraphy]] · [[Radio_communication]] · [[Radio_navigation]] · [[Raytheon]] · [[Retrofit]] · [[Rockwell_Collins]]
**S** — [[Satellite_navigation]] · [[Searchlight]] · [[Selex_ES]] · [[Simplex_communication]] · [[Single_European_Sky_ATM_Research]] · [[Solar_flare]] · [[Sonobuoy]] · [[SpaceX_Dragon_2]] · [[Space_Shuttle]] · [[Stormscope]]
**T** — [[Target_acquisition]] · [[Telegraph_key]] · [[Terrain-following_radar]] · [[Terrain_awareness_warning_system]] · [[TETRA]] · [[Thales_Group]] · [[The_Boeing_Company]] · [[Thrust]] · [[Time-Triggered_Protocol]] · [[Tizard_Mission]] · [[TM_(triode)]] · [[Traffic_alert_and_collision_avoidance_system]] · [[Transponder]] · [[Triode]] · [[Turbulence]] · [[Two_way_radio]]
**U** — [[Ultra_high_frequency]] · [[United_States_Navy]] · [[Universal_Avionics_Systems_Corporation]] · [[UTC_Aerospace_Systems]]
**V** — [[Vacuum_tube]] · [[Very_high_frequency]] · [[VHF_omnidirectional_range]]
**W** — [[WAAS]] · [[Weather_radar]] · [[Wind_shear]] · [[World_War_I]] · [[World_War_II]]
**Z** — [[Zeppelin]]
## Route objects (§10.3 stubs — placeholders declared in `_registry/firebase/`)
- **microsim** — `microsim/{library}/Avionics__{YYYYMMDD}T{HHMM}Z/`
- **songs** — `songs/{Band_name}/{Song_name}/Avionics/`
- **semiotics** — `semiotics/{authorizer}/{set}/{Song_name}/{audio_video_id}/Avionics/`
- **cardset** — `cardset/{authorizer}/{set}/Avionics/`
- **games** — `games/quizzes/Avionics/`
- **channel_stream** — `channel_stream/Avionics/`
- **transcripts** — `transcripts/{audio_video_id}/Avionics/`
Hub + children route keys are pre-declared in `_registry/firebase/expansion_matches.csv`
(54,000 Related Wikipedia Matches). Minting any leaf passes §10.1 registration.
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*Repopulated 2026-09-19 · append-only · source: _tools/generate/g34_portal_section_sims.py@36068b13 (players of the linked articles, each URL 200-checked) · 2 added · 0 deletions*