An air carrier medium large transport climbed in response to a TCASII command.

Attributes
ACN	250528
Time
Date	199308
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : swl
State Reference	MD
Altitude	msl bound lower : 29000 msl bound upper : 30000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zdc artcc : zdc
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
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 1500
ASRS Report	250528
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At cruise FL290, TA shows aircraft 1000 ft below us at 12 O'clock but climbing. According to TCASII, aircraft didn't level off and an RA was issued. We responded to the climb command to almost 1000 ft above till clear of conflict, then returned to FL290. ATC was informed as we initiated RA maneuver. ATC told other aircraft he showed 400 ft high. Aircraft stated level at FL280. No discussion followed.

Original NASA ASRS Text

Title: AN ACR MLG CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: AT CRUISE FL290, TA SHOWS ACFT 1000 FT BELOW US AT 12 O'CLOCK BUT CLBING. ACCORDING TO TCASII, ACFT DIDN'T LEVEL OFF AND AN RA WAS ISSUED. WE RESPONDED TO THE CLB COMMAND TO ALMOST 1000 FT ABOVE TILL CLR OF CONFLICT, THEN RETURNED TO FL290. ATC WAS INFORMED AS WE INITIATED RA MANEUVER. ATC TOLD OTHER ACFT HE SHOWED 400 FT HIGH. ACFT STATED LEVEL AT FL280. NO DISCUSSION FOLLOWED.

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.