<< >> NASA ASRS Report 1515717, February 2018

R90 TRACON controller reported a recurring ads-B problem that indicates erroneous groundspeed readouts.

Attributes
ACN	1515717
Time
Date	201802
Local Time Of Day	0601-1200
Place
Locale Reference	LNK.Airport
State Reference	NE
Environment
Light	Daylight
Aircraft 1
Make Model Name	Super King Air 200
Operating Under FAR Part	Part 91
Flight Phase	Climb Descent
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 3
Events
Anomaly	ATC Issue All Types Deviation - Speed All Types

Narrative:

This is an ads-B event. Aircraft X was descending into lnk. From 11000 ft to 3000 ft the groundspeed readouts were jumping around from 200-340kts. I verified with the pilot that he was flying a constant airspeed in the descent and he verified that he was as well as a constant rate of descent. I advised him about the readouts I was getting and he had stated that other pilots at his base had been told about similar issues at R90.on departure the same aircraft was climbing out showing a constant and normal groundspeed readout on the scope until about 9000 ft when the speed started to fluctuate between 140-290kts. Aircraft X was talking to ZMP at the time so I was unable to verify he was flying a constant speed but his track over the ground appeared to be constant.

Related reports:

• PA28 pilot failed to monitor groundspeed; declared an emerge...
• B737 first officer reported achieving a groundspeed of 210 k...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: R90 TRACON Controller reported a recurring ADS-B problem that indicates erroneous groundspeed readouts.

Narrative: This is an ADS-B event. Aircraft X was descending into LNK. From 11000 ft to 3000 ft the groundspeed readouts were jumping around from 200-340kts. I verified with the pilot that he was flying a constant airspeed in the descent and he verified that he was as well as a constant rate of descent. I advised him about the readouts I was getting and he had stated that other pilots at his base had been told about similar issues at R90.On departure the same aircraft was climbing out showing a constant and normal groundspeed readout on the scope until about 9000 ft when the speed started to fluctuate between 140-290kts. Aircraft X was talking to ZMP at the time so I was unable to verify he was flying a constant speed but his track over the ground appeared to be constant.

Data retrieved from NASA's ASRS site 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.