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Dc-3 opposite direction departure had less than standard separation from southwest-3 on approach. System error.
| Attributes | |
| ACN | 278294 |
| Time | |
| Date | 199407 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : avl |
| State Reference | NC |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : avl tower : avl |
| Operator | general aviation : personal |
| Make Model Name | DC-3/Dakota/Skytrain |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude descent : intermediate altitude |
| Route In Use | arrival : on vectors enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Merlin III |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 278294 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : flight data |
| Qualification | controller : radar |
| Experience | controller military : 4 controller radar : 1 |
| ASRS Report | 278503 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Inter Facility Coordination Failure |
Narrative:
I approved an opposite direction departure for a dc-3 northbound (runway 34) based via a request from the tower. The dc-3 departed and transponder did not come on. I turned a southwest-3 on the approach 12 mi (runway 16) out and descended him to 4600 ft. The dc-3's transponder turned on when the aircraft was 4 mi north climbing out of 4000 ft. I turned the southwest-3 eastbound and canceled his approach clearance. The aircraft probably missed by 700 ft and 2 mi. Supplemental information from acn 278503: tower coordinated an opposite direction departure with radar. Several mins later, the departure called. The controller didn't see his transponder and forgot he departed opposite of the arrival. The tower controller, seeing the situation, called and said are you watching those 2. The radar controller realized his mistake as the departures' transponder showed up 1 mi from the inbound 700 ft apart. He turned the arrival and they missed. Neither plane saw the other. Contributing factors: 1) departure called radar late. 2) transponder was not able to be seen. 3) controller wasn't paying enough attention as he was involved in a conversation.
Original NASA ASRS Text
Title: DC-3 OPPOSITE DIRECTION DEP HAD LTSS FROM SW-3 ON APCH. SYS ERROR.
Narrative: I APPROVED AN OPPOSITE DIRECTION DEP FOR A DC-3 NBOUND (RWY 34) BASED VIA A REQUEST FROM THE TWR. THE DC-3 DEPARTED AND XPONDER DID NOT COME ON. I TURNED A SW-3 ON THE APCH 12 MI (RWY 16) OUT AND DSNDED HIM TO 4600 FT. THE DC-3'S XPONDER TURNED ON WHEN THE ACFT WAS 4 MI N CLBING OUT OF 4000 FT. I TURNED THE SW-3 EBOUND AND CANCELED HIS APCH CLRNC. THE ACFT PROBABLY MISSED BY 700 FT AND 2 MI. SUPPLEMENTAL INFO FROM ACN 278503: TWR COORDINATED AN OPPOSITE DIRECTION DEP WITH RADAR. SEVERAL MINS LATER, THE DEP CALLED. THE CTLR DIDN'T SEE HIS XPONDER AND FORGOT HE DEPARTED OPPOSITE OF THE ARR. THE TWR CTLR, SEEING THE SIT, CALLED AND SAID ARE YOU WATCHING THOSE 2. THE RADAR CTLR REALIZED HIS MISTAKE AS THE DEPS' XPONDER SHOWED UP 1 MI FROM THE INBOUND 700 FT APART. HE TURNED THE ARR AND THEY MISSED. NEITHER PLANE SAW THE OTHER. CONTRIBUTING FACTORS: 1) DEP CALLED RADAR LATE. 2) XPONDER WAS NOT ABLE TO BE SEEN. 3) CTLR WASN'T PAYING ENOUGH ATTN AS HE WAS INVOLVED IN A CONVERSATION.
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.