Air carrier medium large transport altitude deviation excursion from clearance altitude in response ...

Attributes
ACN	194375
Time
Date	199111
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : atl
State Reference	GA
Altitude	msl bound lower : 29000 msl bound upper : 29500
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
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 : 180 flight time total : 8500 flight time type : 300
ASRS Report	194375
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
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 1000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We received a RA while cruising at 29000 ft. The approaching aircraft was cleared to 28000 ft and showed 1100 ft underneath us. We followed the climb command when the aircraft showed 1000 ft underneath us. At 29500 ft the approaching aircraft still showed 1000 ft beneath when we acquired visual contact at approximately 3-5 NM. We immediately descended to 29000 ft when clear of the traffic.

Original NASA ASRS Text

Title: ACR MLG ALTDEV EXCURSION FROM CLRNC ALT IN RESPONSE TO TCASII RA.

Narrative: WE RECEIVED A RA WHILE CRUISING AT 29000 FT. THE APCHING ACFT WAS CLRED TO 28000 FT AND SHOWED 1100 FT UNDERNEATH US. WE FOLLOWED THE CLB COMMAND WHEN THE ACFT SHOWED 1000 FT UNDERNEATH US. AT 29500 FT THE APCHING ACFT STILL SHOWED 1000 FT BENEATH WHEN WE ACQUIRED VISUAL CONTACT AT APPROX 3-5 NM. WE IMMEDIATELY DSNDED TO 29000 FT WHEN CLR OF THE TFC.

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.

Air carrier medium large transport altitude deviation excursion from clearance altitude in response to TCASII RA.