Flight crew of MD88 has less than standard separation from a DC9 while descending on a STAR due to ATC training. Controller is replaced and vectors the aircraft for better separation.

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Attributes
ACN	380094
Time
Date	199709
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mss airport : yul
State Reference	FO
Altitude	msl bound lower : 24700 msl bound upper : 24700
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : czul tower : ewr
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival star : star enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-9 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 260 flight time total : 13000 flight time type : 6000
ASRS Report	380094
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 24500 vertical : 100
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Issued descent and slow down approaching mss VOR on arrival to montreal. Left FL370 and was listening to ATIS for montreal (yul XA00Z, XB05 6 SM visibility 5900 ft, 18 degrees C, 17 degrees C, 997 landing runway 6L ILS and visual approachs). Passing through FL247 noticed TA on TCASII 100-300 ft above our altitude and descending with us. Aircraft appeared to be paralleling our ATC vector 4 1/2 - 5 mi to one side. ATC issued diverging vector to us and the other air carrier. Controller was replaced with another voice and approach continued. Called center later and supervisor said loss of separation occurred and controller training was in progress at time.

Original NASA ASRS Text

Title: FLC OF MD88 HAS LTSS FROM A DC9 WHILE DSNDING ON A STAR DUE TO ATC TRAINING. CTLR IS REPLACED AND VECTORS THE ACFT FOR BETTER SEPARATION.

Narrative: ISSUED DSCNT AND SLOW DOWN APCHING MSS VOR ON ARR TO MONTREAL. LEFT FL370 AND WAS LISTENING TO ATIS FOR MONTREAL (YUL XA00Z, XB05 6 SM VISIBILITY 5900 FT, 18 DEGS C, 17 DEGS C, 997 LNDG RWY 6L ILS AND VISUAL APCHS). PASSING THROUGH FL247 NOTICED TA ON TCASII 100-300 FT ABOVE OUR ALT AND DSNDING WITH US. ACFT APPEARED TO BE PARALLELING OUR ATC VECTOR 4 1/2 - 5 MI TO ONE SIDE. ATC ISSUED DIVERGING VECTOR TO US AND THE OTHER ACR. CTLR WAS REPLACED WITH ANOTHER VOICE AND APCH CONTINUED. CALLED CTR LATER AND SUPVR SAID LOSS OF SEPARATION OCCURRED AND CTLR TRAINING WAS IN PROGRESS AT TIME.

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.