Flight crew of widebody transport at FL250 had TCASII RA descend. TCASII observed traffic had descended 200 ft. Flight crew started descent and at 24600 TCASII signalled clear of traffic.

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Attributes
ACN	195484
Time
Date	199111
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dag
State Reference	CA
Altitude	msl bound lower : 24600 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 25000 flight time type : 8000
ASRS Report	195484
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 8000 flight time type : 1000
ASRS Report	195482
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	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:

While flying at FL250, TCASII issued a TA at 1 O'clock and 10 mi. Traffic was level. As traffic approached to within 7 mi, it had descended 200 ft. At this point TCASII issued an RA to descend. We complied with the RA, received a clear of traffic and returned to FL250. Center frequency was very busy and we were unable to advise them in time. Our largest deviation from altitude was 400 ft for 10 seconds.

Original NASA ASRS Text

Title: FLC OF WDB AT FL250 HAD TCASII RA DSND. TCASII OBSERVED TFC HAD DSNDED 200 FT. FLC STARTED DSCNT AND AT 24600 TCASII SIGNALLED CLR OF TFC.

Narrative: WHILE FLYING AT FL250, TCASII ISSUED A TA AT 1 O'CLOCK AND 10 MI. TFC WAS LEVEL. AS TFC APCHED TO WITHIN 7 MI, IT HAD DSNDED 200 FT. AT THIS POINT TCASII ISSUED AN RA TO DSND. WE COMPLIED WITH THE RA, RECEIVED A CLR OF TFC AND RETURNED TO FL250. CENTER FREQ WAS VERY BUSY AND WE WERE UNABLE TO ADVISE THEM IN TIME. OUR LARGEST DEV FROM ALT WAS 400 FT FOR 10 SECONDS.

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.