> For the complete documentation index, see [llms.txt](https://eavio.gitbook.io/eavio-club/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eavio.gitbook.io/eavio-club/functionalities/weight-and-balance.md).
# Weight & Balance
With the integrated **Weight & Balance module** in the **eAvio platform**, every flight order is automatically checked against the aircraft’s certified limits.
Define your aircraft configuration once, and eAvio platform will guide you through each flight order with clear CG & weight visualization and complete traceability.
W**eight & Balance (W\&B)** module in the **eAvio platform** ensures that every flight is conducted within the aircraft’s certified loading limits.
It is seamlessly integrated into your workflow:
1. **Aircraft module** – where you configure the Weight & Balance data for each aircraft
2. **Flight Orders** – where the configured data is used to calculate and validate your Weight & Balance for each flight
***
### 1. Configuring Weight & Balance
Weight & Balance is configured in the **Weight & Balance Configuration** section of the aircraft in the eAvio platform.
Here you can define all parameters that affect the weight and balance of your aircraft:
* **Basic configuration**
* Aircraft empty weight and center of gravity (CG)
* Maximum gross weight and (optionally) maneuvering speed
* Units for **weight** (lbs/kg) and **arm/CG** (in/cm) – this determines how all values are interpreted
* Optional link to a source page for this configuration (manual PDF, reference website, or other source)
* **Seats**
* Define the position (arm) for each seat
* Example: Pilot, Co‑Pilot, Rear Left, Rear Right
* Seat weights are entered in the flight order based on standard passenger weights from the configuration
* **Baggage / Storage areas**
* Define one or more baggage compartments with their arms and maximum allowed weight
* Can be marked **read‑only** if a fixed load is always present
* **Fuel configuration**
* Define the fuel tank arm, maximum fuel capacity, and fuel density
* The calculator will convert fuel volume to weight automatically
* **Extra equipment (optional)**
* Define any permanent or optional equipment affecting weight and CG
* Can be **read‑only** for permanently installed items
* **Weight & Balance envelope(s)**
* Define one or more polygons representing the safe CG vs Weight area
* For each point, enter **Weight** and **CG**
* These envelopes are used for Weight & Balance calculations in Flight Orders
* If the aircraft’s calculated CG/Weight is outside the envelope, submitting the flight order will not be possible
**📸 Screenshot** 📸 Screenshot – Aircraft Preset Dropdown
**Full Weight & Balance Configuration Section**
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#### Using Aircraft Presets
* eAvio includes **presets for many common aircraft types** (e.g., Cessna, Piper, Cirrus).
* Selecting a preset **loads a template** with typical seats, baggage areas, fuel tanks, and envelopes.
* **You must always adjust the configuration** for your specific aircraft:
* Actual empty weight
* Actual CG position
* Installed equipment and modifications
* Maximum gross weight and maneuvering speed
**📸 Screenshot – Aircraft** Preset Dropdown
***
#### Read‑only Weights
* Storage areas and extra equipment can be marked **read‑only**
* Useful for:
* Always‑present training ballast
* Permanent baggage items
* These weights are automatically included in calculations and cannot be changed in flight orders
***
### 2. Weight & Balance in Flight Orders
Once an aircraft has a valid Weight & Balance configuration:
* The **Weight & Balance calculator** will appear automatically in the Flight Order form
* eAvio **pre‑fills Pilot and Student/Instructor** seats according to the configuration
#### Seat Assignment Logic
* Passengers are assigned to seats **in order**:
1. First passenger → Left front seat (Pilot)
2. Second passenger → Right front seat (Co‑Pilot)
3. Third passenger → Left rear seat
4. Fourth passenger → Right rear seat
* Standard weights are used based on passenger type: **male, female, child, infant**
* These weights can be **manually adjusted** in the calculator if needed
#### Data Entry in Flight Orders
Depending on the aircraft configuration, you may be able to enter:
* **Fuel quantity** – automatically converted to weight
* **Additional passengers** – up to the number of seats configured
* **Baggage** – if storage areas exist for this aircraft
* **Extra equipment** – if the configuration allows adjustments
A **real‑time envelope chart** shows:
* A **moving dot** representing your current CG and total weight
* Whether the aircraft is **inside the safe envelope**
**Submission rule:**
* **Inside the envelope:** The flight order can be submitted
* **Outside the envelope:** Submission is blocked until the load is adjusted
**📸 Screenshot – Flight Order with Weight & Balance Calculator**
***
### 3. Snapshots and Flight History
Every submitted flight order automatically stores a **snapshot** of its Weight & Balance calculation.
* The snapshot shows **exactly how the aircraft was loaded** at the time of submission
* Snapshots remain **unchanged** even if the aircraft configuration is later updated
> **Note:** Snapshots are stored to provide **full traceability** and allow you to demonstrate to inspectors what was entered by the pilot for any specific flight.
**📸 Screenshot – Snapshot View in a Submitted Flight Order**
***
### 4. Advanced Users – JSON Mode
For advanced users, the **Weight & Balance Configuration** section also offers **JSON Mode**:
* Displays the **entire configuration as JSON**
* Allows advanced editing or preparation of configs with external tools
* Useful for:
* Copying configurations between similar aircraft
* Bulk editing seat or envelope data
> ⚠ Only recommended for users familiar with aircraft weight and balance principles.
>
> Incorrect entries can make calculations invalid.
**📸 Screenshot – JSON Mode Example/**