TCASII RA creates an altitude deviation altitude excursion by PIC.

Attributes
ACN	188367
Time
Date	199108
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : phl
State Reference	PA
Altitude	msl bound lower : 11000 msl bound upper : 11700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : mjzs
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : direct enroute airway : zny
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 240 flight time total : 8000 flight time type : 4000
ASRS Report	188367
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

En route to phl at 11000 ft, received a TA from center 'traffic 10 O'clock altitude unknown'. At same time we received a TCASII RA to climb at 1200 FPM. We notified center of the TCASII RA and we immediately climbed at 1200 FPM to 11700 ft until receiving a 'clear of conflict' from TCASII (about 30-45 seconds). We then immediately descended to 11000 and notified center again. We did not see the traffic.

Original NASA ASRS Text

Title: TCASII RA CREATES AN ALT DEV ALT EXCURSION BY PIC.

Narrative: ENRTE TO PHL AT 11000 FT, RECEIVED A TA FROM CENTER 'TFC 10 O'CLOCK ALT UNKNOWN'. AT SAME TIME WE RECEIVED A TCASII RA TO CLB AT 1200 FPM. WE NOTIFIED CENTER OF THE TCASII RA AND WE IMMEDIATELY CLBED AT 1200 FPM TO 11700 FT UNTIL RECEIVING A 'CLR OF CONFLICT' FROM TCASII (ABOUT 30-45 SECONDS). WE THEN IMMEDIATELY DSNDED TO 11000 AND NOTIFIED CENTER AGAIN. WE DID NOT SEE THE TFC.

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.