Pilot deviation resulting in a loss of separation between uga X and uga Y.

Attributes
ACN	281574
Time
Date	199408
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sea
State Reference	WA
Altitude	msl bound lower : 2000 msl bound upper : 2600
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sea
Make Model Name	PA-46 Malibu
Operating Under FAR Part	other : unknown
Flight Phase	climbout : initial
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Aircraft 2
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	other : unknown
Flight Phase	climbout : initial
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure other personnel other
Qualification	controller : radar
Experience	controller non radar : 2 controller radar : 10
ASRS Report	281574
Person 2
Affiliation	government : faa
Function	controller : departure other personnel other
Qualification	controller : non radar
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted other
Consequence	faa : investigated
Miss Distance	horizontal : 9000 vertical : 600
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was conducting OJT on departure east with a high time student. A piper malibu departed bfi runway 13 on the kent 2 departure. He flew it as published for about 3 mi then made a right turn towards the sea VOR. A DH8 simultaneously departed sea runway 16L and was turned by the tower heading 130 degrees. This is standard procedure. The 2 aircraft flew a parallel course for about 30 seconds when the malibu inexplicably made a right turn towards the DH8. The student controller observed the turn and instructed the dash 8 to maintain 2000 ft (instead of 3000 ft as previously assigned by the tower). Additional vectors were issued to the malibu to turn him away from additional sea departures. ARTS III a tracking data indicate the aircraft, both IFR, closed to within 600 ft vertical and 1.46 mi horizontal. At the closest point of approach the dash 8 was level at 2000 ft and the malibu was 2600 ft climbing.

Original NASA ASRS Text

Title: PLTDEV RESULTING IN A LOSS OF SEPARATION BTWN UGA X AND UGA Y.

Narrative: I WAS CONDUCTING OJT ON DEP E WITH A HIGH TIME STUDENT. A PIPER MALIBU DEPARTED BFI RWY 13 ON THE KENT 2 DEP. HE FLEW IT AS PUBLISHED FOR ABOUT 3 MI THEN MADE A R TURN TOWARDS THE SEA VOR. A DH8 SIMULTANEOUSLY DEPARTED SEA RWY 16L AND WAS TURNED BY THE TWR HDG 130 DEGS. THIS IS STANDARD PROC. THE 2 ACFT FLEW A PARALLEL COURSE FOR ABOUT 30 SECONDS WHEN THE MALIBU INEXPLICABLY MADE A R TURN TOWARDS THE DH8. THE STUDENT CTLR OBSERVED THE TURN AND INSTRUCTED THE DASH 8 TO MAINTAIN 2000 FT (INSTEAD OF 3000 FT AS PREVIOUSLY ASSIGNED BY THE TWR). ADDITIONAL VECTORS WERE ISSUED TO THE MALIBU TO TURN HIM AWAY FROM ADDITIONAL SEA DEPS. ARTS III A TRACKING DATA INDICATE THE ACFT, BOTH IFR, CLOSED TO WITHIN 600 FT VERT AND 1.46 MI HORIZ. AT THE CLOSEST POINT OF APCH THE DASH 8 WAS LEVEL AT 2000 FT AND THE MALIBU WAS 2600 FT CLBING.

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.