Altitude deviation altitude excursion on TCASII alert resolution command.

Attributes
ACN	174904
Time
Date	199104
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zdv
State Reference	CO
Altitude	msl bound lower : 27700 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Large Transport, 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 : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 9000 flight time type : 150
ASRS Report	174904
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was in cruise at FL280 when TCAS command to descend was received. I complied with rate of descent of 1100 FPM to FL277. TCAS cleared and I returned to FL280. Entire event took less than 1 min. I advised ATC of the 300' altitude deviation. After landing at den, I phoned den ATC and discussed the event with the area 3 supervisor.

Original NASA ASRS Text

Title: ALT DEVIATION ALT EXCURSION ON TCASII ALERT RESOLUTION COMMAND.

Narrative: I WAS IN CRUISE AT FL280 WHEN TCAS COMMAND TO DSND WAS RECEIVED. I COMPLIED WITH RATE OF DSNT OF 1100 FPM TO FL277. TCAS CLRED AND I RETURNED TO FL280. ENTIRE EVENT TOOK LESS THAN 1 MIN. I ADVISED ATC OF THE 300' ALT DEVIATION. AFTER LNDG AT DEN, I PHONED DEN ATC AND DISCUSSED THE EVENT WITH THE AREA 3 SUPVR.

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.