<< >> NASA ASRS Report 405450, June 1998

Approach controller at bna instructed arriving aircraft to expedite descent through 5000 ft which was occupied by opposite direction traffic.

Attributes
ACN	405450
Time
Date	199806
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bna
State Reference	TN
Altitude	msl bound lower : 5000 msl bound upper : 5300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bna tower : sfo
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Baron 55/Cochise
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 70 flight time total : 4000 flight time type : 70
ASRS Report	405450
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action none taken : unable
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Airline flight air carrier X was operating under bna approach control inbound to land at bna, approximately 35 mi northeast of bna. The flight was cleared from 10000 ft to 4000 ft and cleared for ILS approach runway 20R. Passing approximately 6300 ft the controller cleared the flight to 3000 ft and to expedite through 5000 ft. Traffic was also pointed out at 12 O'clock position, 10 NM at 5000 ft. As the crew of air carrier X increased the descent the TCASII issued a TA. The crew had the traffic on TCASII but could not obtain a visual of the traffic. Within a few seconds, the TCASII issued an RA to 'reduce descent' followed by a 'climb, climb' alert. At some point the controller had given the other aircraft a turn to avoid us. As we stopped our descent and began to climb the crew got a visual on the other aircraft. The other aircraft passed off to our right about 2 mi and about 300 ft below our altitude. Our altitude was approximately 5300 ft.

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Original NASA ASRS Text

Title: APCH CTLR AT BNA INSTRUCTED ARRIVING ACFT TO EXPEDITE DSCNT THROUGH 5000 FT WHICH WAS OCCUPIED BY OPPOSITE DIRECTION TFC.

Narrative: AIRLINE FLT ACR X WAS OPERATING UNDER BNA APCH CTL INBOUND TO LAND AT BNA, APPROX 35 MI NE OF BNA. THE FLT WAS CLRED FROM 10000 FT TO 4000 FT AND CLRED FOR ILS APCH RWY 20R. PASSING APPROX 6300 FT THE CTLR CLRED THE FLT TO 3000 FT AND TO EXPEDITE THROUGH 5000 FT. TFC WAS ALSO POINTED OUT AT 12 O'CLOCK POS, 10 NM AT 5000 FT. AS THE CREW OF ACR X INCREASED THE DSCNT THE TCASII ISSUED A TA. THE CREW HAD THE TFC ON TCASII BUT COULD NOT OBTAIN A VISUAL OF THE TFC. WITHIN A FEW SECONDS, THE TCASII ISSUED AN RA TO 'REDUCE DSCNT' FOLLOWED BY A 'CLB, CLB' ALERT. AT SOME POINT THE CTLR HAD GIVEN THE OTHER ACFT A TURN TO AVOID US. AS WE STOPPED OUR DSCNT AND BEGAN TO CLB THE CREW GOT A VISUAL ON THE OTHER ACFT. THE OTHER ACFT PASSED OFF TO OUR R ABOUT 2 MI AND ABOUT 300 FT BELOW OUR ALT. OUR ALT WAS APPROX 5300 FT.

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.