Altitude deviation altitude excursion.

Attributes
ACN	239649
Time
Date	199304
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 3500 msl bound upper : 4100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dca artcc : zau
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	approach : straight in arrival other arrival star : star
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 : flight engineer pilot : atp
Experience	flight time last 90 days : 160 flight time total : 12000 flight time type : 4800
ASRS Report	239649
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure other anomaly other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 450
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On approach into dca, on a mount vernon arrival, about 15 DME and at 3500 ft, we received a TA from TCASII. Target was below, at about 3000 ft AGL. Seconds later the TA changed to an RA and a climb was initiated to about 4100 ft, when clear of conflict was heard. When we reached 4100 ft we were 13.2 DME from dca VOR. Did not visually see the traffic. Reported to dca approach TCASII altitude deviation and landed uneventfully.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION.

Narrative: ON APCH INTO DCA, ON A MOUNT VERNON ARR, ABOUT 15 DME AND AT 3500 FT, WE RECEIVED A TA FROM TCASII. TARGET WAS BELOW, AT ABOUT 3000 FT AGL. SECONDS LATER THE TA CHANGED TO AN RA AND A CLB WAS INITIATED TO ABOUT 4100 FT, WHEN CLR OF CONFLICT WAS HEARD. WHEN WE REACHED 4100 FT WE WERE 13.2 DME FROM DCA VOR. DID NOT VISUALLY SEE THE TFC. RPTED TO DCA APCH TCASII ALTDEV AND LANDED UNEVENTFULLY.

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.