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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Approach controller descended a C402 too low near a new antenna and had less than standard separation. C402 pilot questioned the controller about the ht of the antenna and controller was unsure. Aircraft passed in close proximity, but had antenna in sight the whole time.
| Attributes | |
| ACN | 338656 |
| Time | |
| Date | 199606 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : srq |
| State Reference | FL |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : tpa tower : tvc |
| Operator | common carrier : air taxi |
| Make Model Name | Cessna 402/402C/B379 Businessliner/Utiliner |
| Operating Under FAR Part | Part 135 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 6 controller radar : 24 |
| ASRS Report | 338656 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : single pilot |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The C402 was inbound to srq requesting descent from 4000 ft to get below a cloud layer. I descended him from 4000 ft to 3000 ft then to 2000 ft. A 1600 ft antenna was on his flight path that I forgot was there until the pilot questioned its ht. I couldn't remember if it was 800 ft or 1600 ft, as it is new and there are numerous antennas in our airspace at those hts. I asked around the room and got a 50/50 response of 800 and 1600 ft. I told the CH02 1600 ft just to be on the safe side and he responded ok. It was too late to take corrective action and he passed about 1/2 mi and 500 ft from the antenna. The biggest contributing factor is the symbol for the antenna on the map is superimposed on the airspace boundary lines which makes it virtually invisible. I have not had the problem before because I never descend an aircraft to 2000 ft 20 mi from an airport.
Original NASA ASRS Text
Title: APCH CTLR DSNDED A C402 TOO LOW NEAR A NEW ANTENNA AND HAD LTSS. C402 PLT QUESTIONED THE CTLR ABOUT THE HT OF THE ANTENNA AND CTLR WAS UNSURE. ACFT PASSED IN CLOSE PROX, BUT HAD ANTENNA IN SIGHT THE WHOLE TIME.
Narrative: THE C402 WAS INBOUND TO SRQ REQUESTING DSCNT FROM 4000 FT TO GET BELOW A CLOUD LAYER. I DSNDED HIM FROM 4000 FT TO 3000 FT THEN TO 2000 FT. A 1600 FT ANTENNA WAS ON HIS FLT PATH THAT I FORGOT WAS THERE UNTIL THE PLT QUESTIONED ITS HT. I COULDN'T REMEMBER IF IT WAS 800 FT OR 1600 FT, AS IT IS NEW AND THERE ARE NUMEROUS ANTENNAS IN OUR AIRSPACE AT THOSE HTS. I ASKED AROUND THE ROOM AND GOT A 50/50 RESPONSE OF 800 AND 1600 FT. I TOLD THE CH02 1600 FT JUST TO BE ON THE SAFE SIDE AND HE RESPONDED OK. IT WAS TOO LATE TO TAKE CORRECTIVE ACTION AND HE PASSED ABOUT 1/2 MI AND 500 FT FROM THE ANTENNA. THE BIGGEST CONTRIBUTING FACTOR IS THE SYMBOL FOR THE ANTENNA ON THE MAP IS SUPERIMPOSED ON THE AIRSPACE BOUNDARY LINES WHICH MAKES IT VIRTUALLY INVISIBLE. I HAVE NOT HAD THE PROB BEFORE BECAUSE I NEVER DSND AN ACFT TO 2000 FT 20 MI FROM AN ARPT.
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.