A80 controller described a terrain warning event during simultaneous prm approaches to runway 10; th...

Attributes
ACN	1084903
Time
Date	201305
Local Time Of Day	1201-1800
Place
Locale Reference	ATL.Airport
State Reference	GA
Aircraft 1
Make Model Name	Regional Jet 700 ER/LR (CRJ700)
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Other Runway 10
Flight Plan	IFR
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

A CRJ7 was cleared for; and established on; the ILS prm runway 10. The CRJ7 was level at 030 and approaching point to switch to tower frequency when the pilot notified me he was responding to a terrain warning. I instructed him to maintain at or below 040 because of traffic on adjacent finals. I then instructed the pilot to track the localized and simultaneously observed the aircraft drifting off the localizer toward the other final. I then instructed the CRJ7 to turn right to a 120 heading in an attempt to achieve separation. Soon after the pilot stated that they had recaptured the localizer. I recleared the CRJ7 for the approach and kept the pilot on my frequency to ensure they were settled on the approach before switching to tower frequency.

Original NASA ASRS Text

Title: A80 Controller described a terrain warning event during simultaneous PRM approaches to Runway 10; the reporter noting the aircraft was initially not established on the localizer.

Narrative: A CRJ7 was cleared for; and established on; the ILS PRM Runway 10. The CRJ7 was level at 030 and approaching point to switch to Tower frequency when the pilot notified me he was responding to a terrain warning. I instructed him to maintain at or below 040 because of traffic on adjacent finals. I then instructed the pilot to track the localized and simultaneously observed the aircraft drifting off the localizer toward the other final. I then instructed the CRJ7 to turn right to a 120 heading in an attempt to achieve separation. Soon after the pilot stated that they had recaptured the localizer. I recleared the CRJ7 for the approach and kept the pilot on my frequency to ensure they were settled on the approach before switching to Tower frequency.

Data retrieved from NASA's ASRS site as of July 2013 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.

A80 controller described a terrain warning event during simultaneous prm approaches to runway 10; the reporter noting the aircraft was initially not established on the localizer.