> For the complete documentation index, see [llms.txt](https://fs2crew.gitbook.io/fs2crew-generation-ai-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fs2crew.gitbook.io/fs2crew-generation-ai-documentation/basics/glossary.md).

# Glossary

## <mark style="color:$primary;">**A**</mark>

**A32NX — Airbus A320neo (FlyByWire)**\
Community‑developed MSFS A320neo variant supported by FS2Crew.

**ADIRS — Air Data Inertial Reference System**\
An onboard aircraft system that combines air data and inertial navigation information to provide critical flight data—such as position, speed, altitude, attitude, and heading—to the cockpit instruments and aircraft systems.

**AI — Artificial Intelligence**\
The system that powers dynamic crew interaction by interpreting user input, managing procedures and cockpit coordination, and generating realistic conversations and flight-specific cabin announcements.

**AI Command Center —** \
Background service required by the FS2Crew MSFS Toolbar, indicated by a green FS2Crew System Tray icon.

**AppData — Application Data**\
The default Windows directory where FS2Crew installs its components.

**APU — Auxiliary Power Unit**\
A small onboard engine that provides electrical power and air for engine start and aircraft systems, especially when the main engines are off.

**Azure — Microsoft Azure**\
A cloud computing platform by Microsoft that provides services such as computing, storage, networking, text-to-speech, and AI tools over the internet.

## <mark style="color:$primary;">B</mark>

**BATC — Beyond ATC**\
An AI-powered air traffic control add-on for flight simulators that delivers realistic, dynamic ATC communications with natural-sounding voices and real-world procedures.\
Link: <https://www.beyondatc.net/>

## <mark style="color:$primary;">**C**</mark>

**CA — Captain**\
The pilot in command with final authority for the safety and operation of the aircraft; in FS2Crew, you are the Captain.

**CM1 — Crew Member 1 (Left Seat)**\
The left-seat pilot, typically the Captain, responsible for primary command duties.

**CM2 — Crew Member 2 (Right Seat)**\
The right-seat pilot, typically the First Officer, assisting with flight operations.

## <mark style="color:$primary;">**D**</mark>

**Descent Mode —** \
FS2Crew automation state enabling approach/landing events

## <mark style="color:$primary;">**E**</mark>

**ElevenLabs — Executable XML File**\
Third‑party text‑to‑speech provider. Especially good for cloning voices.

**EXE.xml — Executable XML File**\
A Microsoft Flight Simulator configuration file used to auto-launch add-ons during startup.

## <mark style="color:$primary;">**F**</mark>

**FA — Flight Attendant**\
A cabin crew member responsible for passenger safety, comfort, and in-flight service.

**FBW — FlyByWire**\
Developer of the A32NX Airbus aircraft for MSFS. \
Link: <https://flybywiresim.com/>

**Flows —** \
Crew actioned procedural sequences, often performed silently.

**FMA — Flight Mode Annunciator**\
A display on the Primary Flight Display that shows the active and armed modes of the aircraft’s autoflight system, including autopilot, autothrust, and flight director modes.

**FO — First Officer**\
The second-in-command pilot who assists the Captain and performs flying or monitoring duties.

**FS2Crew —**\
Flight simulator add-on providing AI-driven multi-crew operations.

## <mark style="color:$primary;">**G**</mark>

**Google TTS — Google Text-to-Speech**\
A cloud-based service by Google that converts written text into natural-sounding spoken audio using AI-generated voices.

**Groq —** \
A high-performance AI platform by Groq used to run text-to-speech models with extremely fast, low-latency audio generation, making it well-suited for real-time voice applications like dynamic crew interactions and announcements.

**Ground Spoiler —** \
Panels on the wing that automatically deploy after touchdown to destroy lift and transfer the aircraft’s weight onto the wheels, improving braking effectiveness.

## <mark style="color:$primary;">**J**</mark>

**JPG — Joint Photographic Experts Group**\
Common compressed image format used for crew avatars in the FS2Crew Comms Center.

## <mark style="color:$primary;">**M**</mark>

**MCDU — Multipurpose Control and Display Unit**\
The cockpit interface used to program and manage the aircraft’s Flight Management System, including flight plans, performance data, and navigation settings.

## <mark style="color:$primary;">**O**</mark>

**OpenAI —** \
A platform by OpenAI that provides advanced AI models capable of converting text into natural, expressive speech, often used for realistic voice generation in applications like virtual crew and automated announcements.

**OS — Operating System**\
Refers to Windows, particularly regarding auto-launching the AI Command Center.

**OTP — One-Time Password**\
A temporary authentication code sent to the user during activation.

## <mark style="color:$primary;">**P**</mark>

**PA — Public Address**\
The aircraft’s onboard audio system used by the flight crew to make announcements to passengers in the cabin.

**PF — Pilot Flying**\
The pilot controlling the aircraft’s flight path; in FS2Crew, you are the PF unless noted otherwise.

**PM — Pilot Monitoring**\
The pilot supporting the PF by handling communications, checklists, and system monitoring.

**PNG — Portable Network Graphics**\
A lossless image file format commonly used for high-quality graphics and images, especially where transparency is needed.

## <mark style="color:$primary;">**R**</mark>

**RAD NAV — Radio Navigation**\
A page on the MCDU used to manually tune and monitor radio navigation aids (such as VOR, ILS, and ADF), allowing pilots to override automatic tuning when required.

## <mark style="color:$primary;">**S**</mark>

**SayIntentions.AI —** \
An AI-powered platform that provides realistic, real-time air traffic control communications for flight simulation, allowing pilots to interact with virtual ATC using natural speech.\
Link: <https://www.sayintentions.ai/>

**SimBrief —** \
An online flight planning tool that generates detailed operational flight plans—including routes, fuel calculations, weather data, and performance figures—for flight simulation. FS2Crew recommends that users utilize SimBrief for every flight, as it can automatically populate flight data fields.\
Link: <https://www.simbrief.com/home/>

**SOPs — Standard Operating Procedures**\
Documented, standardized instructions that define how flight crews perform normal, abnormal, and emergency operations to ensure safety, consistency, and regulatory compliance.

## <mark style="color:$primary;">**T**</mark>

**TOGA — Takeoff/Go-Around**\
A thrust setting and autoflight mode used to provide maximum or near-maximum power for takeoff or for executing a go-around.

**TTS — Text-to-speech**\
Technology that converts written text into natural-sounding spoken audio, often using AI-generated voices.

## <mark style="color:$primary;">**U**</mark>

**UAC — User Account Control**\
A Windows security feature that may block applications unless run as Administrator.

**USB — Universal Serial Bus**\
A standard interface used to connect and power external devices—such as keyboards, storage drives, and peripherals—to a computer or other electronic systems.

## <mark style="color:$primary;">**V**</mark>

**VB-Cable — Virtual Audio Cable**\
A virtual audio device software by VB-Audio that routes audio between applications internally, allowing sound to be sent from one program to another without using physical cables.

## <mark style="color:$primary;">W</mark>

**Whitelist**\
A whitelist is a list of approved users, devices, files, applications, or actions that are explicitly permitted to access or operate within a system. Items on a whitelist are trusted by default, while anything not included may be blocked or require additional approval.

In software and AI systems, a whitelist is commonly used as a security or configuration measure to limit access to specific features, integrations, accounts, or resources that have been verified as safe or authorized.