Air carrier medium large transport altitude deviation in response to TCASII RA.

Attributes
ACN	188556
Time
Date	199109
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : pit
State Reference	PA
Altitude	msl bound lower : 5800 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 7300 flight time type : 3000
ASRS Report	188556
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 300
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

On descent to pit controller called 'known VFR at 6500'. Level at 6000 our TCASII called 'traffic', followed by RA 'monitor vertical speed', followed by 'descend'. We acquired aircraft visually while descending to 5800 ft. Conflict ended. We notified ATC of RA and altitude deviation and climbed back to 6000.

Original NASA ASRS Text

Title: ACR MLG ALT DEV IN RESPONSE TO TCASII RA.

Narrative: ON DSCNT TO PIT CTLR CALLED 'KNOWN VFR AT 6500'. LEVEL AT 6000 OUR TCASII CALLED 'TFC', FOLLOWED BY RA 'MONITOR VERT SPD', FOLLOWED BY 'DSND'. WE ACQUIRED ACFT VISUALLY WHILE DSNDING TO 5800 FT. CONFLICT ENDED. WE NOTIFIED ATC OF RA AND ALT DEV AND CLBED BACK TO 6000.

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.