Btv controller described a near conflict event when an inbound aircraft on a non-precision approach ...

Narrative:

I was working east/west radar at btv. ILS DME runway 33 and RNAV runway 33 approaches were in use. The ILS had an unusable glide slope which has been out for months. A dash 8 departed runway 33 and I turned him direct alb; a 210 heading. A CRJ7 was on a 5 or 6 mile final. Nearly every arrival at btv on the ILS/DME approach receive a low altitude alert due to the pilots using step down altitudes with no glide slope. The CRJ7 was no exception. I am very aware of every step down altitude on this approach and noticed the low altitude alert (la) on the CRJ7 but the pilot was 1-2 hundred ft above where the plane should be so I didn't alert the tower. The tower controller did give a low altitude alert and shortly thereafter; the CRJ7 went missed approach. When the tower controller told me the aircraft was going missed; I told the controller to issue a 360 heading and climb to 3;000. The aircraft turned left direct the btv VORTAC which was quite near the dash 8 aircraft. According to the aim and our training; an aircraft that executes a missed approach shall continue inbound to the missed approach point and then follow the published missed approach procedure. The CRJ7 didn't do this and executed the turn at about a 3-4 mile final. I am not sure if the CRJ7 came closer than 3 miles to the dash 8 but in any case; there was no vertical separation if he did.

Original NASA ASRS Text

Title: BTV Controller described a near conflict event when an inbound aircraft on a non-precision approach was issued a low altitude alert and initiated a missed approach prior to the MDA resulting in the potential conflict.

Narrative: I was working East/West RADAR at BTV. ILS DME Runway 33 and RNAV Runway 33 approaches were in use. The ILS had an unusable glide slope which has been out for months. A Dash 8 departed Runway 33 and I turned him direct ALB; a 210 heading. A CRJ7 was on a 5 or 6 mile final. Nearly every arrival at BTV on the ILS/DME approach receive a low altitude alert due to the pilots using step down altitudes with no glide slope. The CRJ7 was no exception. I am very aware of every step down altitude on this approach and noticed the Low Altitude Alert (LA) on the CRJ7 but the pilot was 1-2 hundred FT above where the plane should be so I didn't alert the Tower. The Tower Controller did give a low altitude alert and shortly thereafter; the CRJ7 went missed approach. When the Tower Controller told me the aircraft was going missed; I told the Controller to issue a 360 heading and climb to 3;000. The aircraft turned left direct the BTV VORTAC which was quite near the Dash 8 aircraft. According to the AIM and our training; an aircraft that executes a missed approach shall continue inbound to the missed approach point and then follow the published missed approach procedure. The CRJ7 didn't do this and executed the turn at about a 3-4 mile final. I am not sure if the CRJ7 came closer than 3 miles to the Dash 8 but in any case; there was no vertical separation if he did.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	917946
Time
Date	201011
Local Time Of Day	1801-2400
Place
Locale Reference	BTV.TRACON
State Reference	VT
Aircraft 1
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	Other Instrument Approach
Flight Plan	IFR
Person 1
Function	Supervisor / CIC Departure Flight Data / Clearance Delivery Approach
Qualification	Air Traffic Control Fully Certified

Btv controller described a near conflict event when an inbound aircraft on a non-precision approach was issued a low altitude alert and initiated a missed approach prior to the MDA resulting in the potential conflict.