Controller clears aircraft to descend and second to climb, 1000 ft apart. TCASII RA causes climb.

Attributes
ACN	277999
Time
Date	199407
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : msy
State Reference	LA
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : msy
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-9 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 : approach
Qualification	controller : radar
Experience	controller military : 5 controller non radar : 6 controller radar : 6
ASRS Report	279999
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Flight X, a B-727, was west of new orleans inbound for landing descending out of 16000 ft for 11000 ft. Flight Y, a dc-9, departed new orleans wbound instructed to climb to 10000 ft. Numerous thunderstorms in the area, space to navigation is limited. Both aircraft were issued traffic on each other when they were 15 mi apart. When X-727 reached 11300 ft and 3 mi from flight Y, the pilot initiated a climb to 12000 ft and advised ATC he was responding to an RA. Then, at 11900 ft, saw the dc-9 and returned back to 11000 ft. Both aircraft were separated properly by ATC. The TCASII RA made a perfectly safe operation totally unsafe.

Original NASA ASRS Text

Title: CTLR CLRS ACFT TO DSND AND SECOND TO CLB, 1000 FT APART. TCASII RA CAUSES CLB.

Narrative: FLT X, A B-727, WAS W OF NEW ORLEANS INBOUND FOR LNDG DSNDING OUT OF 16000 FT FOR 11000 FT. FLT Y, A DC-9, DEPARTED NEW ORLEANS WBOUND INSTRUCTED TO CLB TO 10000 FT. NUMEROUS TSTMS IN THE AREA, SPACE TO NAV IS LIMITED. BOTH ACFT WERE ISSUED TFC ON EACH OTHER WHEN THEY WERE 15 MI APART. WHEN X-727 REACHED 11300 FT AND 3 MI FROM FLT Y, THE PLT INITIATED A CLB TO 12000 FT AND ADVISED ATC HE WAS RESPONDING TO AN RA. THEN, AT 11900 FT, SAW THE DC-9 AND RETURNED BACK TO 11000 FT. BOTH ACFT WERE SEPARATED PROPERLY BY ATC. THE TCASII RA MADE A PERFECTLY SAFE OP TOTALLY UNSAFE.

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.