Reported less than standard separation when a B747 climbed through the altitude of a commuter BE02 w...

Attributes
ACN	371392
Time
Date	199706
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bdr
State Reference	CT
Altitude	msl bound lower : 14000 msl bound upper : 14200
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Experience	controller radar : 15
ASRS Report	371392
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 85 flight time total : 1460 flight time type : 195
ASRS Report	371379
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 150
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

The situation started when I turned a B747 on course anticipating that it would top all the other turboprop aircraft in the airspace. I was distraction putting all the commuters on my frequency in trail using altitude and mileage and didn't realize how slowly the B747 was climbing. The conflict alert went off. I turned and expedited the B747 and descended the BE02. Supplemental information from acn 371379: as we were climbing through 14000 ft we had a TCASII alert at our 5 O'clock position. I looked for a visual on the traffic. There was a B747 below us about 3-5 mi and climbing. At that point, ATC called and said to descend to 11000 ft. After careful evaluation of the situation, I decided not to do what I was instructed by ATC. I felt that if we started to descend that we would have clipped the B747 or we would have hit its wake turbulence. I elected to make a turn to the left to parallel the flight path of the B747. All of this happened within a few seconds. As I started the evasive action, the B747 came into view at our 12 O'clock position. We were very close and the flight crew stated that we were 400 meters away. The entire time, ATC never stated a traffic alert. The ATC operator had no urgency of the situation in her voice. Callback conversation with reporter acn #371392 revealed the following information: they operated with a TCASII. The captain called the facility regarding the near miss and was told they were investigating the incident. They had just come out of the clouds when they saw the B747 and that it moved a little but did not take evasive action. A passenger on the reporter's aircraft commented to the closeness of the B747 to their aircraft.

Original NASA ASRS Text

Title: RPTED LTSS WHEN A B747 CLBED THROUGH THE ALT OF A COMMUTER BE02 WHICH HAD STOPPED ITS CLB AT 14200 FT. THE BE02 RECEIVED A TCASII ALERT ON THE B747 AND TURNED TO PARALLEL ITS COURSE.

Narrative: THE SIT STARTED WHEN I TURNED A B747 ON COURSE ANTICIPATING THAT IT WOULD TOP ALL THE OTHER TURBOPROP ACFT IN THE AIRSPACE. I WAS DISTR PUTTING ALL THE COMMUTERS ON MY FREQ IN TRAIL USING ALT AND MILEAGE AND DIDN'T REALIZE HOW SLOWLY THE B747 WAS CLBING. THE CONFLICT ALERT WENT OFF. I TURNED AND EXPEDITED THE B747 AND DSNDED THE BE02. SUPPLEMENTAL INFO FROM ACN 371379: AS WE WERE CLBING THROUGH 14000 FT WE HAD A TCASII ALERT AT OUR 5 O'CLOCK POS. I LOOKED FOR A VISUAL ON THE TFC. THERE WAS A B747 BELOW US ABOUT 3-5 MI AND CLBING. AT THAT POINT, ATC CALLED AND SAID TO DSND TO 11000 FT. AFTER CAREFUL EVALUATION OF THE SIT, I DECIDED NOT TO DO WHAT I WAS INSTRUCTED BY ATC. I FELT THAT IF WE STARTED TO DSND THAT WE WOULD HAVE CLIPPED THE B747 OR WE WOULD HAVE HIT ITS WAKE TURB. I ELECTED TO MAKE A TURN TO THE L TO PARALLEL THE FLT PATH OF THE B747. ALL OF THIS HAPPENED WITHIN A FEW SECONDS. AS I STARTED THE EVASIVE ACTION, THE B747 CAME INTO VIEW AT OUR 12 O'CLOCK POS. WE WERE VERY CLOSE AND THE FLC STATED THAT WE WERE 400 METERS AWAY. THE ENTIRE TIME, ATC NEVER STATED A TFC ALERT. THE ATC OPERATOR HAD NO URGENCY OF THE SIT IN HER VOICE. CALLBACK CONVERSATION WITH RPTR ACN #371392 REVEALED THE FOLLOWING INFO: THEY OPERATED WITH A TCASII. THE CAPT CALLED THE FACILITY REGARDING THE NEAR MISS AND WAS TOLD THEY WERE INVESTIGATING THE INCIDENT. THEY HAD JUST COME OUT OF THE CLOUDS WHEN THEY SAW THE B747 AND THAT IT MOVED A LITTLE BUT DID NOT TAKE EVASIVE ACTION. A PAX ON THE RPTR'S ACFT COMMENTED TO THE CLOSENESS OF THE B747 TO THEIR ACFT.

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.

Reported less than standard separation when a B747 climbed through the altitude of a commuter BE02 which had stopped its climb at 14200 ft. The BE02 received a TCASII alert on the B747 and turned to parallel its course.