# Primary Flight Data (PFD)

This page contains all the basic aircraft instrumentation and information necessary to fly the MV-22B.

<figure><img src="/files/uamt7HDDzl6KlRWuAdYB" alt=""><figcaption><p>Figure: Primary Flight Data</p></figcaption></figure>

1. **Nacelles Indicator:** Indicates the angle of nacelles in degrees. It also visualizes the “Conversion Corridor” <mark style="background-color:green;">(See Performance for more details)</mark>. Upper and lower limits based on airspeed are shown as two red indicators, safe area is in green.
2. **Indicated Airspeed** (Knots)
3. **Altitude Indicator** (Feet)
4. **Vertical Speed Indicator** (Feet/min): A warning red line appears below 60 knots IAS.&#x20;

{% hint style="danger" %}
Vertical speeds inferior to 1500 ft/min that may result in Vortex Ring State (VRS). Avoid the red line when flying at low speeds/high nacelle angles.&#x20;
{% endhint %}

5. **Radio Altimeter:** Activates at an altitude between 1-5000ft (min altitude can be set in the CDU)
6. **Artificial Horizon**
7. **Interm Power:** Green = normal, Yellow = caution, Red = warning, Red Blinking = engine overstress

{% hint style="danger" %}
Engines cannot sustain full throttle for longer than 60 seconds. If Interm Power is blinking, reduce throttle to at least 98% for a few seconds to reduce stress on the engines.
{% endhint %}

8. **Heading/Compass Indicator**
9. **VOR/Waypoint Information:** Bearing, distance, estimated time arrival.
10. &#x20;**Autopilot Active Data**: (not visible on screenshot)


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