Air carrier medium large transport flight crew has altitude excursion due TCASII RA with aircraft Y.

Attributes
ACN	179424
Time
Date	199105
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 10000 msl bound upper : 10400
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dca
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
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 : 11000 flight time type : 3000
ASRS Report	179424
Person 2
Affiliation	company : air carrier
Function	observation : company check pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 75 flight time total : 8000 flight time type : 5000
ASRS Report	179027
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
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1200
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation

Narrative:

TCASII generated RA and climb command. PF climbed to 10400' and conflict was resolved. ATC inquired and we confirmed RA was given.

Original NASA ASRS Text

Title: ACR MLG FLT CREW HAS ALT EXCURSION DUE TCASII RA WITH ACFT Y.

Narrative: TCASII GENERATED RA AND CLB COMMAND. PF CLBED TO 10400' AND CONFLICT WAS RESOLVED. ATC INQUIRED AND WE CONFIRMED RA WAS GIVEN.

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.