Medium large transport at level altitude receives RA to descend with traffic indicated 1000 ft below. RA instructions change to climb, then monitor vertical speed. Never gave a clear of conflict. TCASII written up.

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Attributes
ACN	219349
Time
Date	199208
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : rod
State Reference	OH
Altitude	msl bound lower : 25000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : cfi pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 30000 flight time type : 3000
ASRS Report	219349
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Miss Distance	horizontal : 0 vertical : 1000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

WX radar was on, TCASII was automatic. Copilot saw traffic. At night, looked level -- switched to 20 mi range TCASII. Aircraft showed 1000 ft below followed momentarily with 'descend, descend, descend' followed momentarily with 'climb, climb, climb' followed momentarily with 'monitor vertical speed, monitor vertical speed.' aircraft passed behind. Written in TCASII on CDU, but, no 'clear of conflict' from the voice synthesizer. The TCASII was tested ok. The TCASII was written up.

Original NASA ASRS Text

Title: MLG AT LEVEL ALT RECEIVES RA TO DSND WITH TFC INDICATED 1000 FT BELOW. RA INSTRUCTIONS CHANGE TO CLB, THEN MONITOR VERT SPD. NEVER GAVE A CLR OF CONFLICT. TCASII WRITTEN UP.

Narrative: WX RADAR WAS ON, TCASII WAS AUTO. COPLT SAW TFC. AT NIGHT, LOOKED LEVEL -- SWITCHED TO 20 MI RANGE TCASII. ACFT SHOWED 1000 FT BELOW FOLLOWED MOMENTARILY WITH 'DSND, DSND, DSND' FOLLOWED MOMENTARILY WITH 'CLB, CLB, CLB' FOLLOWED MOMENTARILY WITH 'MONITOR VERT SPD, MONITOR VERT SPD.' ACFT PASSED BEHIND. WRITTEN IN TCASII ON CDU, BUT, NO 'CLR OF CONFLICT' FROM THE VOICE SYNTHESIZER. THE TCASII WAS TESTED OK. THE TCASII WAS WRITTEN UP.

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.