Large transport has TCASII RA to climb while descending.

Attributes
ACN	243321
Time
Date	199306
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : msy
State Reference	LA
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : msy
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 60 flight time total : 6000 flight time type : 60
ASRS Report	243321
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 other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 3000 vertical : 550
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

TCASII issued TA for traffic 10-11 O'clock, approximately 4 mi. RA issued climb, climbing traffic. Instructed by ivsi to climb 3000 FPM. We complied. Visual contact made after 'monitor vertical speed' command issued by TCASII. ATC gave no advisory traffic was in area. When we questioned after clear of traffic, controller made comment that other aircraft was probably united states custom service operating outside TCA. Other aircraft was an small transport jet. ATC should have been more alert to other traffic in area. It sounded like same controller voice on approach control frequency, tower frequency, and ground control. If so, then he was overloaded with areas of control.

Original NASA ASRS Text

Title: LGT HAS TCASII RA TO CLB WHILE DSNDING.

Narrative: TCASII ISSUED TA FOR TFC 10-11 O'CLOCK, APPROX 4 MI. RA ISSUED CLB, CLBING TFC. INSTRUCTED BY IVSI TO CLB 3000 FPM. WE COMPLIED. VISUAL CONTACT MADE AFTER 'MONITOR VERT SPD' COMMAND ISSUED BY TCASII. ATC GAVE NO ADVISORY TFC WAS IN AREA. WHEN WE QUESTIONED AFTER CLR OF TFC, CTLR MADE COMMENT THAT OTHER ACFT WAS PROBABLY UNITED STATES CUSTOM SVC OPERATING OUTSIDE TCA. OTHER ACFT WAS AN SMT JET. ATC SHOULD HAVE BEEN MORE ALERT TO OTHER TFC IN AREA. IT SOUNDED LIKE SAME CTLR VOICE ON APCH CTL FREQ, TWR FREQ, AND GND CTL. IF SO, THEN HE WAS OVERLOADED WITH AREAS OF CTL.

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.