Near midair collision between air carrier-medium large transport and unk-small transport.

Attributes
ACN	95885
Time
Date	198810
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bwi
State Reference	MD
Altitude	msl bound lower : 10300 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 160 flight time total : 13000
ASRS Report	95885
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac
Independent Detector	other other : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 300 vertical : 100
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Jumpseat rider spotted converging traffic 10-11 O'clock, same altitude (small transport) at a 90 degree angle to our southerly heading. Captain and first officer reacted simultaneously by disengaging autoplt and climbing above traffic, which was banked to the right 45-60 degrees and turning from west to north. Traffic passed below and left of our left wing. Subsequent radio contact with approach control verified traffic no code/VFR code altitude readout 10300' (not previously reported). Our evasive pull up, straight ahead, entailed 1000' from descent to abrupt 1000' FPM climb with some passenger on the left side of the plane witnessing the encounter. Resumed descent to 1000' as assigned and continued to destination. Landed west/O incident. Note: incident occurred seconds after a F/a closed the cockpit door following the request of change of a $20 bill. Both pilots were momentarily distracted.

Original NASA ASRS Text

Title: NMAC BETWEEN ACR-MLG AND UNK-SMT.

Narrative: JUMPSEAT RIDER SPOTTED CONVERGING TFC 10-11 O'CLOCK, SAME ALT (SMT) AT A 90 DEG ANGLE TO OUR SOUTHERLY HDG. CAPT AND F/O REACTED SIMULTANEOUSLY BY DISENGAGING AUTOPLT AND CLBING ABOVE TFC, WHICH WAS BANKED TO THE RIGHT 45-60 DEGS AND TURNING FROM W TO N. TFC PASSED BELOW AND LEFT OF OUR LEFT WING. SUBSEQUENT RADIO CONTACT WITH APCH CTL VERIFIED TFC NO CODE/VFR CODE ALT READOUT 10300' (NOT PREVIOUSLY RPTED). OUR EVASIVE PULL UP, STRAIGHT AHEAD, ENTAILED 1000' FROM DSCNT TO ABRUPT 1000' FPM CLB WITH SOME PAX ON THE LEFT SIDE OF THE PLANE WITNESSING THE ENCOUNTER. RESUMED DSCNT TO 1000' AS ASSIGNED AND CONTINUED TO DEST. LANDED W/O INCIDENT. NOTE: INCIDENT OCCURRED SECS AFTER A F/A CLOSED THE COCKPIT DOOR FOLLOWING THE REQUEST OF CHANGE OF A $20 BILL. BOTH PLTS WERE MOMENTARILY DISTRACTED.

Data retrieved from NASA's ASRS site as of August 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.