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Xna controller describes error in wrong selection of ILS equipment for aircraft awaiting approach resulting in go around.
| Attributes | |
| ACN | 638062 |
| Time | |
| Date | 200411 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : xna.airport |
| State Reference | AR |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tower : xna.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer & glide slope : 16 |
| Flight Phase | descent : approach landing : missed approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : local |
| Qualification | controller : radar controller : non radar pilot : private pilot : instrument |
| Experience | controller non radar : 1 controller radar : 10 controller time certified in position1 : 11 controller time certified in position2 : 6 flight time total : 1800 |
| ASRS Report | 638062 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
A CRJ2 aircraft from ord to xna advised fyva over jadir that they weren't receiving a GS signal. The reason they weren't getting the GS was because I had previously set the ILS to runway 34 to permit a previous aircraft to land on that runway (at the request of the pilot and fyva, razorback approach control). The CRJ2 executed a missed approach 4 NM from runway 16 and never descended below 3000 ft MSL, the MSA for the GS intercept. I had forgotten to change the ILS back to runway 16 after the landing to runway 34. Traffic was very light at the time. Both ILS system at xna use the same frequency (110.55) so we (ATC's) can only select 1 runway at a time. Pilots can tell which approach is selected by listening to the ILS identify -- each system has a unique identify. It takes about 30 seconds to switch between ILS system. I caused this situation but the pilots could have noticed this error earlier in the approach had they first listened to the identify code for the ILS system.
Original NASA ASRS Text
Title: XNA CTLR DESCRIBES ERROR IN WRONG SELECTION OF ILS EQUIP FOR ACFT AWAITING APCH RESULTING IN GAR.
Narrative: A CRJ2 ACFT FROM ORD TO XNA ADVISED FYVA OVER JADIR THAT THEY WEREN'T RECEIVING A GS SIGNAL. THE REASON THEY WEREN'T GETTING THE GS WAS BECAUSE I HAD PREVIOUSLY SET THE ILS TO RWY 34 TO PERMIT A PREVIOUS ACFT TO LAND ON THAT RWY (AT THE REQUEST OF THE PLT AND FYVA, RAZORBACK APCH CTL). THE CRJ2 EXECUTED A MISSED APCH 4 NM FROM RWY 16 AND NEVER DSNDED BELOW 3000 FT MSL, THE MSA FOR THE GS INTERCEPT. I HAD FORGOTTEN TO CHANGE THE ILS BACK TO RWY 16 AFTER THE LNDG TO RWY 34. TFC WAS VERY LIGHT AT THE TIME. BOTH ILS SYS AT XNA USE THE SAME FREQ (110.55) SO WE (ATC'S) CAN ONLY SELECT 1 RWY AT A TIME. PLTS CAN TELL WHICH APCH IS SELECTED BY LISTENING TO THE ILS IDENT -- EACH SYS HAS A UNIQUE IDENT. IT TAKES ABOUT 30 SECONDS TO SWITCH BTWN ILS SYS. I CAUSED THIS SIT BUT THE PLTS COULD HAVE NOTICED THIS ERROR EARLIER IN THE APCH HAD THEY FIRST LISTENED TO THE IDENT CODE FOR THE ILS SYS.
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.