Flight crew of an medium large transport air carrier aircraft deviated from assigned in response to ...

Attributes
ACN	244974
Time
Date	199306
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : vla
State Reference	IL
Altitude	msl bound lower : 25000 msl bound upper : 27000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent 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 : 40 flight time total : 12000 flight time type : 7000
ASRS Report	244974
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 180 flight time total : 15000 flight time type : 5000
ASRS Report	244962
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 other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 2000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Complied with TCASII RA to descend at 2000 FPM to lower altitude, ATC was advised. After leveling off at FL250 it was determined to be probably a malfunction in equipment. Note: the threat aircraft also got an RA not to descend. The TCASII equipment was written up and pulled for testing. I cannot offer any recommendation as to what could be done to solve this problem.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DEVIATED FROM ASSIGNED IN RESPONSE TO A TCASII RA.

Narrative: COMPLIED WITH TCASII RA TO DSND AT 2000 FPM TO LOWER ALT, ATC WAS ADVISED. AFTER LEVELING OFF AT FL250 IT WAS DETERMINED TO BE PROBABLY A MALFUNCTION IN EQUIP. NOTE: THE THREAT ACFT ALSO GOT AN RA NOT TO DSND. THE TCASII EQUIP WAS WRITTEN UP AND PULLED FOR TESTING. I CANNOT OFFER ANY RECOMMENDATION AS TO WHAT COULD BE DONE TO SOLVE THIS PROB.

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.

Flight crew of an medium large transport air carrier aircraft deviated from assigned in response to a TCASII RA.