Small aircraft Y non adherence to ATC instruction flew wrong heading had near midair collision less than standard separation from small aircraft X. System error.

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Attributes
ACN	266050
Time
Date	199403
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bal
State Reference	MD
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	other personnel other
Qualification	pilot : instrument pilot : cfi
Experience	flight time last 90 days : 25 flight time total : 1750 flight time type : 250
ASRS Report	266050
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : published procedure non adherence : required legal separation non adherence : clearance other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 50
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Operational Error Pilot Deviation

Narrative:

Small aircraft X conducting the third in a series of 4 ILS (practice) approachs to runway 28 at bwi. X had been told to descend to 2000 ft, intercept the localizer and had been cleared for the approach. Immediately after getting established on the localizer, I noticed another ordinal Y at 12 O'clock position, at our altitude, approximately 1/2 - 1 mi away. I took control of the aircraft and initiated a right turn to avoid the other aircraft. I did not see the other aircraft alter course. Approach was calling traffic for us during this maneuver. I informed approach of the other aircraft heading and altitude and we completed the approach. A phone call to approach after landing indicated the other pilot seemed to be having a problem with headings. He was heading approximately 100 degrees when he passed us and had been given a 010 degree heading. This points out the necessity for diligence even in class B airspace.

Original NASA ASRS Text

Title: SMA Y NON ADHERENCE TO ATC INSTRUCTION FLEW WRONG HDG HAD NMAC LTSS FROM SMA X. SYS ERROR.

Narrative: SMA X CONDUCTING THE THIRD IN A SERIES OF 4 ILS (PRACTICE) APCHS TO RWY 28 AT BWI. X HAD BEEN TOLD TO DSND TO 2000 FT, INTERCEPT THE LOC AND HAD BEEN CLRED FOR THE APCH. IMMEDIATELY AFTER GETTING ESTABLISHED ON THE LOC, I NOTICED ANOTHER ORDINAL Y AT 12 O'CLOCK POS, AT OUR ALT, APPROX 1/2 - 1 MI AWAY. I TOOK CTL OF THE ACFT AND INITIATED A R TURN TO AVOID THE OTHER ACFT. I DID NOT SEE THE OTHER ACFT ALTER COURSE. APCH WAS CALLING TFC FOR US DURING THIS MANEUVER. I INFORMED APCH OF THE OTHER ACFT HDG AND ALT AND WE COMPLETED THE APCH. A PHONE CALL TO APCH AFTER LNDG INDICATED THE OTHER PLT SEEMED TO BE HAVING A PROB WITH HDGS. HE WAS HDG APPROX 100 DEGS WHEN HE PASSED US AND HAD BEEN GIVEN A 010 DEG HDG. THIS POINTS OUT THE NECESSITY FOR DILIGENCE EVEN IN CLASS B AIRSPACE.

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.