Potential conflict created by opposite direction traffic descent through assigned altitude.

Attributes
ACN	228901
Time
Date	199212
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : vhp
State Reference	IN
Altitude	msl bound lower : 27600 msl bound upper : 28000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid tower : spi
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 18000 flight time type : 13000
ASRS Report	228901
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 700
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

ZID advised that we had traffic at 12 O'clock, eastbound, at FL290 and at, I believe he said, 15 mi. We shortly picked him up on TCASII at plus 900 ft and descending. Then plus 800 descending, I started getting a TCASII warning and advised center that I was descending. The lowest information on TCASII was plus 700 and this was while we were descending. We descended to FL276 before we saw the TCASII separation number increasing. Passed overhead reading plus 900 and climbing. Center was kept advised and did not indicate any problems.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT CREATED BY OPPOSITE DIRECTION TFC DSCNT THROUGH ASSIGNED ALT.

Narrative: ZID ADVISED THAT WE HAD TFC AT 12 O'CLOCK, EBOUND, AT FL290 AND AT, I BELIEVE HE SAID, 15 MI. WE SHORTLY PICKED HIM UP ON TCASII AT PLUS 900 FT AND DSNDING. THEN PLUS 800 DSNDING, I STARTED GETTING A TCASII WARNING AND ADVISED CTR THAT I WAS DSNDING. THE LOWEST INFO ON TCASII WAS PLUS 700 AND THIS WAS WHILE WE WERE DSNDING. WE DSNDED TO FL276 BEFORE WE SAW THE TCASII SEPARATION NUMBER INCREASING. PASSED OVERHEAD READING PLUS 900 AND CLBING. CTR WAS KEPT ADVISED AND DID NOT INDICATE ANY PROBS.

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.