TCASII RA creates an altitude deviation altitude excursion by PIC.

Attributes
ACN	200646
Time
Date	199202
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ric
State Reference	VA
Altitude	msl bound lower : 2500 msl bound upper : 3000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tracon : ric
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 : atp
Experience	flight time last 90 days : 210 flight time total : 7500
ASRS Report	200646
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 400
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

While being vectored at 3000 ft MSL for a left base to ILS 16 at ric, approach advised us that traffic to our right would follow us visually to runway 16. Shortly after this call, we got a TCASII altitude alert followed by a RA to descend at a min of 1000 FPM. Traffic indicated 400 ft above at the time of the RA closing both vertically and horizontally. Following the RA instructions we immediately descended from 3000 ft MSL to 2500 ft MSL, which terminated the RA. We immediately advised approach control at the time of the occurrence and they assigned us 2500 ft MSL for the approach. We continued vectors and ILS approach to 16, no other incidents occurred. Ground tested TCASII at the gate and it tested ok.

Original NASA ASRS Text

Title: TCASII RA CREATES AN ALTDEV ALT EXCURSION BY PIC.

Narrative: WHILE BEING VECTORED AT 3000 FT MSL FOR A L BASE TO ILS 16 AT RIC, APCH ADVISED US THAT TFC TO OUR R WOULD FOLLOW US VISUALLY TO RWY 16. SHORTLY AFTER THIS CALL, WE GOT A TCASII ALT ALERT FOLLOWED BY A RA TO DSND AT A MIN OF 1000 FPM. TFC INDICATED 400 FT ABOVE AT THE TIME OF THE RA CLOSING BOTH VERTICALLY AND HORIZLY. FOLLOWING THE RA INSTRUCTIONS WE IMMEDIATELY DSNDED FROM 3000 FT MSL TO 2500 FT MSL, WHICH TERMINATED THE RA. WE IMMEDIATELY ADVISED APCH CTL AT THE TIME OF THE OCCURRENCE AND THEY ASSIGNED US 2500 FT MSL FOR THE APCH. WE CONTINUED VECTORS AND ILS APCH TO 16, NO OTHER INCIDENTS OCCURRED. GND TESTED TCASII AT THE GATE AND IT TESTED OK.

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.