Altitude deviation altitude undershot in climb by air carrier medium large transport after TCASII RA with opposite direction traffic.

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Attributes
ACN	216794
Time
Date	199207
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mxe airport : phl
State Reference	PA
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
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	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 : 9500 flight time type : 1500
ASRS Report	216794
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : undershoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Our flight cleared to FL230, working ZNY. Center called mutual traffic, to us and a VFR target at 13500 ft. We were on a heading assigned by center and at approximately 12000 ft when he called traffic. TCASII picked him up at 10-11 O'clock. VFR traffic told center he had us in sight. We still didn't see him. TCASII gave a monitor vertical speed command, indicating not to descend and keep climb rate we had. Still looking outside for traffic. TCASII gave climb command -- I believe in excess of 2500 FPM. As we were increasing climb, TCASII reversed to 'descend' command. We descended to approximately 12000 ft from 13000 ft, notified center and then continued our climb. ATC said it didn't appear closer than 1 NM separation and 500 ft vertically. It appears TCASII did what it was planned to do. It avoided a possible conflict. After we notified that we were responding to an RA, he again confirmed with the VFR target that they had us visually. The target again answered, 'yes.'

Original NASA ASRS Text

Title: ALTDEV ALT UNDERSHOT IN CLB BY ACR MLG AFTER TCASII RA WITH OPPOSITE DIRECTION TFC.

Narrative: OUR FLT CLRED TO FL230, WORKING ZNY. CTR CALLED MUTUAL TFC, TO US AND A VFR TARGET AT 13500 FT. WE WERE ON A HDG ASSIGNED BY CTR AND AT APPROX 12000 FT WHEN HE CALLED TFC. TCASII PICKED HIM UP AT 10-11 O'CLOCK. VFR TFC TOLD CTR HE HAD US IN SIGHT. WE STILL DIDN'T SEE HIM. TCASII GAVE A MONITOR VERT SPD COMMAND, INDICATING NOT TO DSND AND KEEP CLB RATE WE HAD. STILL LOOKING OUTSIDE FOR TFC. TCASII GAVE CLB COMMAND -- I BELIEVE IN EXCESS OF 2500 FPM. AS WE WERE INCREASING CLB, TCASII REVERSED TO 'DSND' COMMAND. WE DSNDED TO APPROX 12000 FT FROM 13000 FT, NOTIFIED CTR AND THEN CONTINUED OUR CLB. ATC SAID IT DIDN'T APPEAR CLOSER THAN 1 NM SEPARATION AND 500 FT VERTICALLY. IT APPEARS TCASII DID WHAT IT WAS PLANNED TO DO. IT AVOIDED A POSSIBLE CONFLICT. AFTER WE NOTIFIED THAT WE WERE RESPONDING TO AN RA, HE AGAIN CONFIRMED WITH THE VFR TARGET THAT THEY HAD US VISUALLY. THE TARGET AGAIN ANSWERED, 'YES.'

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.