A pbi controller described a proximity event that occurred when a SW4 aircraft descended rapidly to ...

Attributes
ACN	843895
Time
Date	200907
Local Time Of Day	1201-1800
Place
Locale Reference	PBI.TRACON
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B717 (Formerly MD-95)
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR FRWAY
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Radar 2 Air Traffic Control Time Certified In Pos 1 (mon) 8
Events
Anomaly	Conflict Airborne Conflict
Miss Distance	Horizontal 1 Vertical 900

Narrative:

B717 was given decent clearance from 10;000 to 4000. B717 was leaving 9400 when SW4 was given decent clearance out of 12;000 to 9000. About two minutes later B717 was descending through 8200 and the SW4 had reached 9100 for one sweep. The B717 was given a turn to an intersection away from the SW4. The B717 continued descending through 8000 and the SW4 leveled off at 9000. No traffic was given. Two radar positions were open with the third having just been closed. The closure of the third increased the workload 40%. About 10 aircraft were being worked at the time.

Original NASA ASRS Text

Title: A PBI Controller described a proximity event that occurred when a SW4 aircraft descended rapidly to an altitude not yet legally separated from an altitude recently vacated by a B717.

Narrative: B717 was given decent clearance from 10;000 to 4000. B717 was leaving 9400 when SW4 was given decent clearance out of 12;000 to 9000. About two minutes later B717 was descending through 8200 and the SW4 had reached 9100 for one sweep. The B717 was given a turn to an intersection away from the SW4. The B717 continued descending through 8000 and the SW4 leveled off at 9000. No traffic was given. Two radar positions were open with the third having just been closed. The closure of the third increased the workload 40%. About 10 aircraft were being worked at the time.

Data retrieved from NASA's ASRS site as of April 2012 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.

A pbi controller described a proximity event that occurred when a SW4 aircraft descended rapidly to an altitude not yet legally separated from an altitude recently vacated by a B717.