Data block drops when radar scope is centered or de-centered.

Attributes
ACN	253239
Time
Date	199310
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 8000 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : stl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other descent other
Route In Use	enroute : on vectors enroute airway : stl
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 2
ASRS Report	253239
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Navigational Facility
Air Traffic Incident	other
Situations
Navigational Aid	Unspecified

Narrative:

I was at the arrival south position and had just decombined the position and de-centered the scope. I noticed that air carrier X, an medium large transport, was displayed on arrival north's radar scope, but not on arrival south's. I observed a primary and beacon, not a data tag. I had to center and de-center the scope to get a tag. This should be fixed to prevent a system error or worse. This same situation occurred earlier in the day.

Original NASA ASRS Text

Title: DATA BLOCK DROPS WHEN RADAR SCOPE IS CTRED OR DE-CTRED.

Narrative: I WAS AT THE ARR S POS AND HAD JUST DECOMBINED THE POS AND DE-CTRED THE SCOPE. I NOTICED THAT ACR X, AN MLG, WAS DISPLAYED ON ARR NORTH'S RADAR SCOPE, BUT NOT ON ARR SOUTH'S. I OBSERVED A PRIMARY AND BEACON, NOT A DATA TAG. I HAD TO CTR AND DE-CTR THE SCOPE TO GET A TAG. THIS SHOULD BE FIXED TO PREVENT A SYS ERROR OR WORSE. THIS SAME SIT OCCURRED EARLIER IN THE DAY.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.