Altitude deviation altitude excursion after TCASII RA on opposite direction traffic.

Attributes
ACN	246222
Time
Date	199307
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : msp
State Reference	MN
Altitude	msl bound lower : 7000 msl bound upper : 7500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : msp
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 : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 115 flight time total : 13800 flight time type : 8876
ASRS Report	246222
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude 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	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Approach control called traffic at 12 O'clock, 10 mi, 1000 ft below us. Aircraft was not sighted but appeared on our TCASII at 900 ft below us. We watched TCASII presentation but could not pick up the aircraft visually. His altitude varied from 900 ft to 700 ft below us and closing. Our TCASII announced a 'climb' RA as he approached. I disconnected the autoplt and followed the RA. At approximately 500 ft above our assigned altitude the TCASII announced 'clear of conflict' and I returned to 7000 ft assigned. We reported the RA to msp approach, and they reported that he was at 6000 ft.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION AFTER TCASII RA ON OPPOSITE DIRECTION TFC.

Narrative: APCH CTL CALLED TFC AT 12 O'CLOCK, 10 MI, 1000 FT BELOW US. ACFT WAS NOT SIGHTED BUT APPEARED ON OUR TCASII AT 900 FT BELOW US. WE WATCHED TCASII PRESENTATION BUT COULD NOT PICK UP THE ACFT VISUALLY. HIS ALT VARIED FROM 900 FT TO 700 FT BELOW US AND CLOSING. OUR TCASII ANNOUNCED A 'CLB' RA AS HE APCHED. I DISCONNECTED THE AUTOPLT AND FOLLOWED THE RA. AT APPROX 500 FT ABOVE OUR ASSIGNED ALT THE TCASII ANNOUNCED 'CLR OF CONFLICT' AND I RETURNED TO 7000 FT ASSIGNED. WE RPTED THE RA TO MSP APCH, AND THEY RPTED THAT HE WAS AT 6000 FT.

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.