 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
DC9 positioning between atl runway 27L and right at taxiway K cause GS deflection for aircraft on 10 mile final.
| Attributes | |
| ACN | 505535 |
| Time | |
| Date | 200103 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Altitude | msl bound lower : 1900 msl bound upper : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tower : atl.tower tracon : pia.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 27l |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar |
| Experience | controller radar : 19 |
| ASRS Report | 505535 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : undershoot inflight encounter : weather non adherence : published procedure other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : radar other controllera other flight crewa |
| Resolutory Action | flight crew : took precautionary avoidance action flight crew : returned to intended or assigned course flight crew : returned to assigned airspace |
| Consequence | faa : investigated |
| Supplementary | |
| Problem Areas | Aircraft Navigational Facility Flight Crew Human Performance ATC Human Performance Weather Airport |
| Primary Problem | ATC Human Performance |
| Situations | |
| ATC Facility | procedure or policy : atl.tower |
Narrative:
A DC9 was held short of runway 27L on taxiway K, approximately 300 east of glideslope antenna. Since the (atl) ceiling was greater than 800 ft, this was legal. However, interference caused numerous aircraft to descend well below the glideslope, one aircraft was down to 1000 AGL 10 miles from the airport. The DC9 was moved immediately. GS returned to normal. Callback conversation with reporter revealed the following information: reporter advised that the DC9 was 'caught' there, that the controller was attempting to land a few more arrivals when the condition was observed and corrected. A facility specialist advised that taxiway K is not a staging area for runway 27L departures, and used only when traffic situations do not pan-out, and waiting for the next opportunity to launch a departure. Due to the physical location of the GS shack to taxiway K, it is not unexpected that an aircraft could cause momentary electronic deflections.
Original NASA ASRS Text
Title: DC9 POSITIONING BETWEEN ATL RWY 27L AND R AT TXWY K CAUSE GS DEFLECTION FOR ACFT ON 10 MILE FINAL.
Narrative: A DC9 WAS HELD SHORT OF RWY 27L ON TXWY K, APPROX 300 EAST OF GLIDESLOPE ANTENNA. SINCE THE (ATL) CEILING WAS GREATER THAN 800 FT, THIS WAS LEGAL. HOWEVER, INTERFERENCE CAUSED NUMEROUS ACFT TO DESCEND WELL BELOW THE GLIDESLOPE, ONE ACFT WAS DOWN TO 1000 AGL 10 MILES FROM THE ARPT. THE DC9 WAS MOVED IMMEDIATELY. GS RETURNED TO NORMAL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED THAT THE DC9 WAS 'CAUGHT' THERE, THAT THE CTLR WAS ATTEMPTING TO LAND A FEW MORE ARRIVALS WHEN THE CONDITION WAS OBSERVED AND CORRECTED. A FAC SPECIALIST ADVISED THAT TXWY K IS NOT A STAGING AREA FOR RWY 27L DEPS, AND USED ONLY WHEN TFC SITUATIONS DO NOT PAN-OUT, AND WAITING FOR THE NEXT OPPORTUNITY TO LAUNCH A DEP. DUE TO THE PHYSICAL LOCATION OF THE GS SHACK TO TXWY K, IT IS NOT UNEXPECTED THAT AN ACFT COULD CAUSE MOMENTARY ELECTRONIC DEFLECTIONS.
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.