TRACON approach controller allows trainee to make judgement traffic spacing call that he cannot save. Coordination effected by other TRACON controller allowing 2 aircraft on final (B737 and D328) to takeoff to allow for his (B757) to be put in front. Separation lost in trying to put the original 2 aircraft back on final behind the B757.

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Attributes
ACN	405202
Time
Date	199806
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mmj airport : pit
State Reference	PA
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : pit
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach other personnel other
Qualification	controller : developmental pilot : private
Experience	controller radar : 2 flight time total : 280
ASRS Report	405202
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller non radar : 3 controller radar : 9 flight time total : 70
ASRS Report	406358
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was training at arrival radar south position at pit. With numerous aircraft on vectors the two in question had been turned off the final approach course to make room for a B757 that should have landed on another runway. After realizing this would not work, the instructor noticed the two in question closing and took immediate action to ensure separation. Supplemental information from acn 406358: I let trainee pick the slot on final for the B757 (with the concurrence of the other arrival controller, who was working the B757). In retrospect, I would tell the other arrival controller to follow a different airplane.

Original NASA ASRS Text

Title: TRACON APCH CTLR ALLOWS TRAINEE TO MAKE JUDGEMENT TFC SPACING CALL THAT HE CANNOT SAVE. COORD EFFECTED BY OTHER TRACON CTLR ALLOWING 2 ACFT ON FINAL (B737 AND D328) TO TKOF TO ALLOW FOR HIS (B757) TO BE PUT IN FRONT. SEPARATION LOST IN TRYING TO PUT THE ORIGINAL 2 ACFT BACK ON FINAL BEHIND THE B757.

Narrative: I WAS TRAINING AT ARR RADAR S POS AT PIT. WITH NUMEROUS ACFT ON VECTORS THE TWO IN QUESTION HAD BEEN TURNED OFF THE FINAL APCH COURSE TO MAKE ROOM FOR A B757 THAT SHOULD HAVE LANDED ON ANOTHER RWY. AFTER REALIZING THIS WOULD NOT WORK, THE INSTRUCTOR NOTICED THE TWO IN QUESTION CLOSING AND TOOK IMMEDIATE ACTION TO ENSURE SEPARATION. SUPPLEMENTAL INFO FROM ACN 406358: I LET TRAINEE PICK THE SLOT ON FINAL FOR THE B757 (WITH THE CONCURRENCE OF THE OTHER ARR CTLR, WHO WAS WORKING THE B757). IN RETROSPECT, I WOULD TELL THE OTHER ARR CTLR TO FOLLOW A DIFFERENT AIRPLANE.

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.