Air carrier widebody transport altitude deviation excursion from clearance altitude in response to T...

Attributes
ACN	199530
Time
Date	199201
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : djb
State Reference	OH
Altitude	msl bound lower : 23500 msl bound upper : 24000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : zob
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 14000 flight time type : 1200
ASRS Report	199530
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	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

FL240 approaching djb VOR had just switched to new controller but had not yet made contact. TCASII TA extreme edge of vsi (yellow symbol) 12 O'clock turned into RA (red) at about 2 O'clock. We turned left 240 without clearance in response to TCASII RA. Informed ATC of deviation and reason. Was cleared immediately to 17000. TCASII clear of conflict at 23500. Red TCASII symbol showed +1100 but was unable to see arrow showing climb or descent. Contacted center when on ground. They stated that they had no alert on their end and controller showed no traffic in that position at the time. I'm fairly sure that this was not a fake indication.

Original NASA ASRS Text

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

Narrative: FL240 APCHING DJB VOR HAD JUST SWITCHED TO NEW CTLR BUT HAD NOT YET MADE CONTACT. TCASII TA EXTREME EDGE OF VSI (YELLOW SYMBOL) 12 O'CLOCK TURNED INTO RA (RED) AT ABOUT 2 O'CLOCK. WE TURNED L 240 WITHOUT CLRNC IN RESPONSE TO TCASII RA. INFORMED ATC OF DEV AND REASON. WAS CLRED IMMEDIATELY TO 17000. TCASII CLR OF CONFLICT AT 23500. RED TCASII SYMBOL SHOWED +1100 BUT WAS UNABLE TO SEE ARROW SHOWING CLB OR DSCNT. CONTACTED CENTER WHEN ON GND. THEY STATED THAT THEY HAD NO ALERT ON THEIR END AND CTLR SHOWED NO TFC IN THAT POS AT THE TIME. I'M FAIRLY SURE THAT THIS WAS NOT A FAKE INDICATION.

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 widebody transport altitude deviation excursion from clearance altitude in response to TCASII RA.