Runway Visual Range (RVR)

What Is Runway Visual Range (RVR)?#

Runway Visual Range (RVR) is the instrumentally derived horizontal distance, measured along the runway centerline, over which a pilot can see runway surface markings or lights from a height corresponding to the eye position of a pilot on final approach. This guide is part of Aviatopia's Aviation Weather Explained series.

RVR is runway-specific and is reported in feet in the United States and meters in most ICAO states. It represents the visual conditions available for landing or takeoff on a particular runway, not the general airport visibility.

RVR becomes operationally controlling during instrument flight rules (IFR) operations, especially when conducting a precision approach such as an ILS.

Why It Matters in Aviation#

RVR directly affects whether an aircraft may:

• Begin or continue an instrument approach
• Descend below decision altitude (DA) or decision height (DH)
• Initiate a takeoff in low visibility
• Conduct low-visibility surface operations

Published approach minima specify either visibility (statute miles or meters) or RVR. When RVR is reported and required for the procedure, it becomes the controlling value.

Air traffic control uses RVR to implement low-visibility procedures, protect critical ILS areas, and determine runway suitability. For airlines and dispatchers, RVR influences alternate planning, fuel strategy, and diversion decisions.

How RVR Is Measured#

RVR is measured using transmissometers or forward-scatter sensors installed adjacent to the runway. These devices evaluate how much light is scattered or absorbed by atmospheric particles such as fog, mist, rain, or snow.

Most precision runways provide up to three RVR reporting positions:

The Touchdown Zone RVR is normally controlling for approach minima unless otherwise specified.

Sensor output is processed to represent the distance at which runway centerline or edge lights of standard intensity would be visible to a pilot at approximately 50 feet above touchdown.

How RVR Is Reported in a METAR#

RVR is included in a METAR when visibility drops below certain thresholds or when required by national reporting criteria.

Example:

R27L/1200FT

Breakdown:

• R27L → Runway 27 Left
• 1200FT → 1,200 feet RVR

Variable RVR example:

R09/0600V1000FT

• 0600V1000FT → Variable between 600 and 1,000 feet

Trend indicators may be appended:

• U → Upward (improving)
• D → Downward (deteriorating)
• N → No significant change

Example:

R27/1400FTU

This indicates improving RVR.

For a complete breakdown of METAR structure, see our guide on how to read a METAR.

RVR vs Prevailing Visibility#

RVR and prevailing visibility are distinct measurements.

In dense fog, prevailing visibility may report 1 statute mile while RVR is 1,200 feet. For many precision approaches, RVR—not prevailing visibility—determines whether the approach may continue.

For broader weather context, see aviation weather explained.

Operational Example#

An aircraft is conducting an ILS Category I approach requiring 2,400 feet RVR.

ATIS reports:

R27L/2200FT

Because reported RVR is below required minimums, the approach may not be initiated or continued beyond the final approach fix, depending on regulatory framework.

Later, RVR updates to:

R27L/2600FT

The reported value now meets minimums, allowing the approach to proceed.

For Category II and III operations, certified aircraft and equipped runways may allow significantly lower RVR values, subject to regulatory approval and operator authorization.

RVR and Takeoff Minima#

RVR also governs low-visibility departures.

Standard takeoff minima vary by regulatory authority and runway lighting configuration. Reduced takeoff RVR typically requires:

• Runway centerline lighting
• High-intensity runway lights (HIRL)
• Adequate runway edge lighting
• Approved operator procedures

Aircraft equipped with head-up displays (HUD) or enhanced flight vision systems (EFVS) may qualify for lower takeoff RVR, subject to certification and regulation.

Specific thresholds differ between authorities such as the FAA and EASA; pilots must consult applicable regulations and operator specifications.

Common Misconceptions#

“RVR and visibility are identical.” They are measured differently and serve different regulatory functions.

“If I can see runway lights, the RVR must be adequate.” RVR is based on calibrated sensor systems, not subjective pilot perception.

“RVR replaces decision altitude.” RVR determines whether continuation is permitted; DA/DH determines the decision point during descent.

“RVR is available at every airport.” Only runways equipped with approved sensor systems report RVR.

“RVR only affects landing.” Takeoff minima are frequently expressed in RVR.

Frequently Asked Questions#

Key Takeaways#

• Runway Visual Range (RVR) measures how far a pilot can see along the runway centerline.
• It is runway-specific and may differ from airport-wide visibility.
• RVR is measured by calibrated sensor systems, not pilot estimates.
• Touchdown Zone RVR is typically controlling for landing minima.
• RVR is reported in feet (US) or meters (most ICAO states).
• Both landing and takeoff minima may depend on RVR.
• Regulatory authority and aircraft certification determine allowable minimum values.

When visibility deteriorates, RVR becomes the decisive metric for safe and legal instrument operations.

Sources & References#

• FAA Aeronautical Information Manual (AIM), Chapter 1 — Air navigation including runway visual range reporting and interpretation.
• ICAO Annex 3 — Meteorological Service for International Air Navigation — International standards for RVR measurement and reporting.
• SKYbrary — Runway Visual Range — Operational reference for RVR systems and regulatory minimums.

Related Guides#

• How to Read a METAR
• Crosswind Explained
• Airport Operations 101

More in Aviation Weather#

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