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# FlightPhaseEstimation (UORB message)

**TOPICS:** flight_phase_estimation

## Fields

| Name         | Type     | Unit [Frame] | Range/Enum | Description                            |
| ------------ | -------- | ------------ | ---------- | -------------------------------------- |
| timestamp    | `uint64` |              |            | time since system start (microseconds) |
| flight_phase | `uint8`  |              |            | Estimate of current flight phase       |

## Constants

| Name                                                    | Type    | Value | Description                     |
| ------------------------------------------------------- | ------- | ----- | ------------------------------- |
| <a id="#FLIGHT_PHASE_UNKNOWN"></a> FLIGHT_PHASE_UNKNOWN | `uint8` | 0     | vehicle flight phase is unknown |
| <a id="#FLIGHT_PHASE_LEVEL"></a> FLIGHT_PHASE_LEVEL     | `uint8` | 1     | Vehicle is in level flight      |
| <a id="#FLIGHT_PHASE_DESCEND"></a> FLIGHT_PHASE_DESCEND | `uint8` | 2     | vehicle is in descend           |
| <a id="#FLIGHT_PHASE_CLIMB"></a> FLIGHT_PHASE_CLIMB     | `uint8` | 3     | vehicle is climbing             |

## Source Message

[Source file (GitHub)](https://github.com/PX4/PX4-Autopilot/blob/main/msg/FlightPhaseEstimation.msg)

::: details Click here to see original file

```c
uint64 timestamp               # time since system start (microseconds)

uint8 flight_phase 		# Estimate of current flight phase

uint8 FLIGHT_PHASE_UNKNOWN = 0  # vehicle flight phase is unknown
uint8 FLIGHT_PHASE_LEVEL = 1	# Vehicle is in level flight
uint8 FLIGHT_PHASE_DESCEND = 2	# vehicle is in descend
uint8 FLIGHT_PHASE_CLIMB = 3   # vehicle is climbing
```

:::