Altitude deviation altitude excursion in pilot flight crew response to TCASII RA.

Attributes
ACN	217112
Time
Date	199208
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	msl bound lower : 3000 msl bound upper : 3400
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dtw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	approach : straight in enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 11430 flight time type : 7000
ASRS Report	217112
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 3000 vertical : 200
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

TCASII had TA of an aircraft below us about 200 ft approaching us from our 10:30 position. We were just above a layer of clouds and were unable to establish visual contact with traffic. The TCASII then upgraded advisory to an RA saying monitor vertical rate, followed shortly by a climb RA. We immediately complied with RA and climbed to 3400 ft when a clear of conflict was given and immediately returned to 3000 ft and reported the conflict to ATC whom was very busy on the frequency. I followed up with a telephone conversation with controller. He said he had no conflicts with our climb and had no traffic other than a primary target.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION IN PLT FLC RESPONSE TO TCASII RA.

Narrative: TCASII HAD TA OF AN ACFT BELOW US ABOUT 200 FT APCHING US FROM OUR 10:30 POS. WE WERE JUST ABOVE A LAYER OF CLOUDS AND WERE UNABLE TO ESTABLISH VISUAL CONTACT WITH TFC. THE TCASII THEN UPGRADED ADVISORY TO AN RA SAYING MONITOR VERT RATE, FOLLOWED SHORTLY BY A CLB RA. WE IMMEDIATELY COMPLIED WITH RA AND CLBED TO 3400 FT WHEN A CLR OF CONFLICT WAS GIVEN AND IMMEDIATELY RETURNED TO 3000 FT AND RPTED THE CONFLICT TO ATC WHOM WAS VERY BUSY ON THE FREQ. I FOLLOWED UP WITH A TELEPHONE CONVERSATION WITH CTLR. HE SAID HE HAD NO CONFLICTS WITH OUR CLB AND HAD NO TFC OTHER THAN A PRIMARY TARGET.

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.