Potential conflict during a circle to another runway in a night operation.

Attributes
ACN	240135
Time
Date	199304
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : bwi
State Reference	MD
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : bwi
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach landing : go around
Route In Use	approach : circling
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain instruction : trainee
Qualification	pilot : atp
Experience	flight time last 90 days : 25 flight time total : 10000 flight time type : 10
ASRS Report	240135
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer observation : company check pilot oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Second day of IOE for new captain. On approach to bwi (visual) runway 10, tower controller requested we side-step to runway 15R. As instructor was programming for runway change, I observed aircraft on a long final for what I thought was runway 15L (commuter aircraft). As we turned short final TCASII gave warning 'do not descend.' I maintained altitude and flew commands of TCASII. Executed missed approach without further incident. Later learned other aircraft was air carrier flight on final for runway 15R also. Not sure of conflict altitudes. Tower controller was working both tower and ground control. An aircraft had been cleared for takeoff on runway 28.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT DURING A CIRCLE TO ANOTHER RWY IN A NIGHT OP.

Narrative: SECOND DAY OF IOE FOR NEW CAPT. ON APCH TO BWI (VISUAL) RWY 10, TWR CTLR REQUESTED WE SIDE-STEP TO RWY 15R. AS INSTRUCTOR WAS PROGRAMMING FOR RWY CHANGE, I OBSERVED ACFT ON A LONG FINAL FOR WHAT I THOUGHT WAS RWY 15L (COMMUTER ACFT). AS WE TURNED SHORT FINAL TCASII GAVE WARNING 'DO NOT DSND.' I MAINTAINED ALT AND FLEW COMMANDS OF TCASII. EXECUTED MISSED APCH WITHOUT FURTHER INCIDENT. LATER LEARNED OTHER ACFT WAS ACR FLT ON FINAL FOR RWY 15R ALSO. NOT SURE OF CONFLICT ALTS. TWR CTLR WAS WORKING BOTH TWR AND GND CTL. AN ACFT HAD BEEN CLRED FOR TKOF ON RWY 28.

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.