A heavy jet captain on the phl jimms 2 RNAV arrival took evasive action to a momentarily TCAS RA des...

Attributes
ACN	1263415
Time
Date	201504
Local Time Of Day	1801-2400
Place
Locale Reference	PHL.TRACON
State Reference	PA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Widebody Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR JIIMS 2
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude

Narrative:

Level at 6000 ft on the JIIMS2 RNAV arrival dasha transition; between jiims and wojik fixes. Received a TCAS RA to descend; no sooner than I started the descent the RA command immediately changed to a climb. We climbed to about 6400 ft before returning to our assigned altitude of 6000 ft. I briefly saw the traffic before focusing all my attention to following the TCAS commands. TCAS maneuver was performed per sops. ATC never said a word to us before; during; or after the event. It appeared they had a lot to say to the other aircraft though. Both aircraft were under ATC control with the same controller at the time of the incident. Other aircraft either changed altitude or turned the wrong direction creating a reduction in separation with us.as long as there are at least two aircraft in the air at the same time this type of event may occur again. Know and follow sops.

Original NASA ASRS Text

Title: A heavy jet Captain on the PHL JIMMS 2 RNAV Arrival took evasive action to a momentarily TCAS RA DESCEND command followed by a CLIMB command. The climb from the other IFR traffic was to about 6400 ft before returning to 6000 ft.

Narrative: Level at 6000 ft on the JIIMS2 RNAV Arrival DASHA Transition; between JIIMS and WOJIK fixes. Received a TCAS RA to descend; no sooner than I started the descent the RA command immediately changed to a climb. We climbed to about 6400 ft before returning to our assigned altitude of 6000 ft. I briefly saw the traffic before focusing all my attention to following the TCAS commands. TCAS maneuver was performed per SOPs. ATC never said a word to us before; during; or after the event. It appeared they had a lot to say to the other aircraft though. Both aircraft were under ATC control with the same controller at the time of the incident. Other aircraft either changed altitude or turned the wrong direction creating a reduction in separation with us.As long as there are at least two aircraft in the air at the same time this type of event may occur again. Know and follow SOPs.

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.

A heavy jet captain on the phl jimms 2 RNAV arrival took evasive action to a momentarily TCAS RA descend command followed by a climb command. The climb from the other IFR traffic was to about 6400 ft before returning to 6000 ft.