DescriptionPAR Scope.jpg	SRA James Calkins, an air traffic controller with the 1974th Communications Group of the Air Force Communications Command (AFCC), is reflected in the precision approach radar scope as he directs an aircraft. Location: SCOTT AIR FORCE BASE, ILLINOIS (IL) UNITED STATES OF AMERICA (USA)
Date	Prise le 1er novembre 1980
Source	ID:DFST8203799
Auteur	Service Depicted: Air Force
Autorisation (Réutilisation de ce fichier)	Public domainPublic domainfalsefalse Cette image ou ce fichier est un travail réalisé par un aviateur ou un employé de l'U.S. Air Force, pris ou fait dans le cadre des fonctions officielles de cette personne. En tant que travail du Gouvernement fédéral des États-Unis, cette image ou ce fichier est dans le domaine public. العربية ∙ беларуская (тарашкевіца) ∙ català ∙ čeština ∙ Deutsch ∙ English ∙ español ∙ eesti ∙ فارسی ∙ suomi ∙ français ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ മലയാളം ∙ မြန်မာဘာသာ ∙ norsk bokmål ∙ Plattdüütsch ∙ Nederlands ∙ polski ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ српски / srpski ∙ svenska ∙ Türkçe ∙ українська ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−

description

From: w:en:Radar_display#Beta_Scan_Scope

The specialist Beta Scan Scope was used for precision approach radar systems. It displays two lines on the same display, the upper one (typically) displaying the vertical approach (the glideslope), and the lower one the horizontal approach. A marker indicates the desired touchdown point on the runway, and often the lines are angled towards the middle of the screen to indicate this location. A single aircraft's "blip" is also displayed, superimposed over both lines, the signals being generated from separate antennas. Deviation from the centerline of the approach can be seen and easily relayed to the pilot.

In the image, the upper portion of the display shows the vertical situation, and the lower portion the horizontal. In the vertical, the two diagonal lines show the desired glideslope (upper) and minimum altitude approach (lower). The aircraft began its approach below the glideslope and captured it just before landing. The proper landing point is shown by the horizontal line at the left end. The lower display shows the aircraft starting to the left of the approach line and then being guided toward it.