An air carrier medium large transport aircraft climbed in response to a TCASII command.

Attributes
ACN	248776
Time
Date	199308
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 3000 msl bound upper : 5500
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dca artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 3000
ASRS Report	248776
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 7000 flight time type : 3000
ASRS Report	248633
Events
Anomaly	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	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	unspecified : 12000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Upon approach, ATC advised us to descend to 3000 ft (from 6000 ft) and upon reaching 3000 ft, slow to 210 KTS (from 250 KTS). We observed traffic ahead of us on TCASII above us, descending, and at a range of 4 mi. Passing 4000 ft, we received a TCASII RA showing a required climb of 3500 FPM. We complied with RA and initiated a climb. At 5000 ft, RA was cancelled with a 'monitor vertical speed' advisory. ATC advised us they had no conflict with separation of traffic. Supplemental information from acn 248633: I believe the original vectoring did not work out quite as well as the controller planned, and it was good to have a TCASII backup.

Original NASA ASRS Text

Title: AN ACR MLG ACFT CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: UPON APCH, ATC ADVISED US TO DSND TO 3000 FT (FROM 6000 FT) AND UPON REACHING 3000 FT, SLOW TO 210 KTS (FROM 250 KTS). WE OBSERVED TFC AHEAD OF US ON TCASII ABOVE US, DSNDING, AND AT A RANGE OF 4 MI. PASSING 4000 FT, WE RECEIVED A TCASII RA SHOWING A REQUIRED CLB OF 3500 FPM. WE COMPLIED WITH RA AND INITIATED A CLB. AT 5000 FT, RA WAS CANCELLED WITH A 'MONITOR VERT SPD' ADVISORY. ATC ADVISED US THEY HAD NO CONFLICT WITH SEPARATION OF TFC. SUPPLEMENTAL INFO FROM ACN 248633: I BELIEVE THE ORIGINAL VECTORING DID NOT WORK OUT QUITE AS WELL AS THE CTLR PLANNED, AND IT WAS GOOD TO HAVE A TCASII BACKUP.

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.