Flight crew of small transport X failed to descent in a timely manner. Pilot deviation. Less than st...

Attributes
ACN	126868
Time
Date	198910
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : hmv
State Reference	TN
Altitude	msl bound lower : 31400 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 1 controller radar : 19 controller supervisory : 3
ASRS Report	126868
Person 2
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 15680 vertical : 1600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

The error occurred at the beckley high sector during a heavy traffic period. There were 31 data blocks displayed on the radar scope of which 17 were on frequency--3 leaving the sector, 5 entering and the remainder pointouts. 5 of the aircraft were conflicting at FL330. I discussed the situation with the tracker and we decided to descend small transport X from FL330 to FL310, which would solve most of the conflicts. Aircraft a was at 12 O'clock and 60 mi from small transport X at the time descent clearance was issued. At that time I believed the situation to be resolved. I noticed C/a activated and then deactivated as small transport X started down. I intended to monitor the situation, but was distracted by other aircraft calling on frequency and another traffic situation. I was also offered a break at this time. I believe that it was at this time that C/a reactivated and was suppressed by the tracker west/O my knowledge. When my scan returned to this traffic situation, the aircraft were approximately 7 mi apart and small transport X was only out of FL317. I instructed small transport X to expedite descent and report level at FL310. The report came 5 seconds after aedp activated. I believe the error occurred due to my failure to closely monitor the situation, complicated by distrs elsewhere at the sector and the actions of my tracker--assuming I was aware of the situation and inhibiting the C/a. The fact that it took small transport X 4 mins to descend 2000' also bothers me.

Original NASA ASRS Text

Title: FLT CREW OF SMT X FAILED TO DESCENT IN A TIMELY MANNER. PLT DEVIATION. LESS THAN STANDARD SEPARATION BETWEEN SMT X AND ACFT Y. SYSTEM ERROR.

Narrative: THE ERROR OCCURRED AT THE BECKLEY HIGH SECTOR DURING A HEAVY TFC PERIOD. THERE WERE 31 DATA BLOCKS DISPLAYED ON THE RADAR SCOPE OF WHICH 17 WERE ON FREQ--3 LEAVING THE SECTOR, 5 ENTERING AND THE REMAINDER POINTOUTS. 5 OF THE ACFT WERE CONFLICTING AT FL330. I DISCUSSED THE SITUATION WITH THE TRACKER AND WE DECIDED TO DSND SMT X FROM FL330 TO FL310, WHICH WOULD SOLVE MOST OF THE CONFLICTS. ACFT A WAS AT 12 O'CLOCK AND 60 MI FROM SMT X AT THE TIME DSCNT CLRNC WAS ISSUED. AT THAT TIME I BELIEVED THE SITUATION TO BE RESOLVED. I NOTICED C/A ACTIVATED AND THEN DEACTIVATED AS SMT X STARTED DOWN. I INTENDED TO MONITOR THE SITUATION, BUT WAS DISTRACTED BY OTHER ACFT CALLING ON FREQ AND ANOTHER TFC SITUATION. I WAS ALSO OFFERED A BREAK AT THIS TIME. I BELIEVE THAT IT WAS AT THIS TIME THAT C/A REACTIVATED AND WAS SUPPRESSED BY THE TRACKER W/O MY KNOWLEDGE. WHEN MY SCAN RETURNED TO THIS TFC SITUATION, THE ACFT WERE APPROX 7 MI APART AND SMT X WAS ONLY OUT OF FL317. I INSTRUCTED SMT X TO EXPEDITE DESCENT AND RPT LEVEL AT FL310. THE RPT CAME 5 SECS AFTER AEDP ACTIVATED. I BELIEVE THE ERROR OCCURRED DUE TO MY FAILURE TO CLOSELY MONITOR THE SITUATION, COMPLICATED BY DISTRS ELSEWHERE AT THE SECTOR AND THE ACTIONS OF MY TRACKER--ASSUMING I WAS AWARE OF THE SITUATION AND INHIBITING THE C/A. THE FACT THAT IT TOOK SMT X 4 MINS TO DSND 2000' ALSO BOTHERS ME.

Data retrieved from NASA's ASRS site as of August 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.

Flight crew of small transport X failed to descent in a timely manner. Pilot deviation. Less than standard separation between small transport X and aircraft Y. System error.