Large transport received TCASII RA.

Attributes
ACN	187762
Time
Date	199108
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sie
State Reference	NJ
Altitude	msl bound lower : 20700 msl bound upper : 21000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Heavy Transport
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	187762
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

Got TCASII RA, began descent and went 300 ft low, advised ATC. Traffic in sight entire time. Hard to tell at night whether to stay level, or descend, so we followed RA for a moment.

Original NASA ASRS Text

Title: LGT RECEIVED TCASII RA.

Narrative: GOT TCASII RA, BEGAN DSCNT AND WENT 300 FT LOW, ADVISED ATC. TFC IN SIGHT ENTIRE TIME. HARD TO TELL AT NIGHT WHETHER TO STAY LEVEL, OR DSND, SO WE FOLLOWED RA FOR A MOMENT.

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.