A B767-200 flight crew; descending to 11;000 MSL; responded to a TCAS RA generated by a flight of two VFR military aircraft climbing to 10;500 MSL.

2011-11 · NASA ASRS report 984025

Date: 2011-11 · Aircraft: B767-200 · Phase: descent

Anomalies: conflict-airborne-conflict|deviation-altitude-excursion-from-assigned-altitude

Synopsis

A B767-200 flight crew; descending to 11;000 MSL; responded to a TCAS RA generated by a flight of two VFR military aircraft climbing to 10;500 MSL.

Narrative

On descent into PHL between BRIGS and VCN and descending to 11;000 MSL; ATC advised of traffic climbing to 10;500 below us. We had no visual contact. Passing northeast of ACY VOR we received an RA climb command at about 11;500. The Captain disconnected the autopilot and autothrottle and commenced an immediate climb to satisfy a VSI command of 'almost all of the VSI red!' While I tried to acquire the traffic I advised ATC we had received an RA and were climbing to follow it. I thought I saw traffic and it appeared to be single low wing aircraft coming near us; possibly less than 1;000 FT horizontally. On TCAS screen I got the impression that traffic was still climbing and not diverging even though we were now in steep climb. It appeared to go above 11;000. We continued to communicate with ATC and stopped climb once RA ceased clear of conflict approximately 13;000 and then descended back to 11;000. ATC advised it was a flight of two USAF A-10's. It appeared to me they were VFR traffic that were cleared to--but failed to level off at--10;500 and had actually climbed through 11;000. ATC should have better facts about actual vertical/horizontal distances.

Second reporter narrative

I was working a B-767 PHL arrival descending to 11;000 FT. ACY called me and pointed out a flight of A-10s entering R5002 VFR and climbing to 10;500. I then advised ACY of the B767.I called the traffic to my inbound who acknowledged and then told me that he was responding to a RA and was climbing; he went up to 13;000; and said the aircraft did not look like A-10's and were higher than 10;500.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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