TCASII aircraft followed RA command and climbed.

Attributes
ACN	299154
Time
Date	199503
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mxe
State Reference	PA
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl artcc : zny
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 7500
ASRS Report	299154
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 8500 flight time type : 1800
ASRS Report	299527
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were climbing to assigned altitude of 10000 ft. Phl departure control pointed out VFR traffic at 11 O'clock at 9500 ft. We responded with a negative contact. ATC then asked an aircraft if he saw an MD80 at 2 O'clock. He responded affirmatively, ATC then gave us a left turn as we were leveling at 10000 ft. At this point we received a TCASII RA with a climb command. We followed TCASII RA command to climb. At 10600 ft command changed to monitor vertical speed. We leveled at 11000 ft - assigned altitude was 10000 ft. After 'RA' said clear of conflict we descended back to 10000 ft. We advised ATC we had climbed in response to an 'RA.' ATC said the VFR aircraft had us in sight. In my opinion the VFR aircraft did not take enough evasive action to provide adequate separation. We never saw the VFR aircraft. We are required to respond to an RA if we do not have the other aircraft in sight.

Original NASA ASRS Text

Title: TCASII ACFT FOLLOWED RA COMMAND AND CLBED.

Narrative: WE WERE CLBING TO ASSIGNED ALT OF 10000 FT. PHL DEP CTL POINTED OUT VFR TFC AT 11 O'CLOCK AT 9500 FT. WE RESPONDED WITH A NEGATIVE CONTACT. ATC THEN ASKED AN ACFT IF HE SAW AN MD80 AT 2 O'CLOCK. HE RESPONDED AFFIRMATIVELY, ATC THEN GAVE US A L TURN AS WE WERE LEVELING AT 10000 FT. AT THIS POINT WE RECEIVED A TCASII RA WITH A CLB COMMAND. WE FOLLOWED TCASII RA COMMAND TO CLB. AT 10600 FT COMMAND CHANGED TO MONITOR VERT SPD. WE LEVELED AT 11000 FT - ASSIGNED ALT WAS 10000 FT. AFTER 'RA' SAID CLR OF CONFLICT WE DSNDED BACK TO 10000 FT. WE ADVISED ATC WE HAD CLBED IN RESPONSE TO AN 'RA.' ATC SAID THE VFR ACFT HAD US IN SIGHT. IN MY OPINION THE VFR ACFT DID NOT TAKE ENOUGH EVASIVE ACTION TO PROVIDE ADEQUATE SEPARATION. WE NEVER SAW THE VFR ACFT. WE ARE REQUIRED TO RESPOND TO AN RA IF WE DO NOT HAVE THE OTHER ACFT IN SIGHT.

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