Altitude deviation altitude excursion during flight crew response to TCASII RA.

Attributes
ACN	218004
Time
Date	199208
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute airway : ord
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 175 flight time total : 19000 flight time type : 300
ASRS Report	218004
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 : clearance non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 11500 vertical : 800
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Level 11000 assigned, controller advised traffic 10.5 and climbing. At the same time TCASII TA 11 O'clock, 3 mi. TCASII RA climb message and vsi red band up 2000. I immediately pulled to 3000 FPM. Clear of traffic message at about 11600. I leveled 12000. Captain advised ATC, I pushed down to 11000 at about 1000 or 1500 FPM. ATC said proceed direct to ord when able and change frequency to next controller. No visual contact with traffic. TCASII seemed to work exactly as advertised.

Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION DURING FLC RESPONSE TO TCASII RA.

Narrative: LEVEL 11000 ASSIGNED, CTLR ADVISED TFC 10.5 AND CLBING. AT THE SAME TIME TCASII TA 11 O'CLOCK, 3 MI. TCASII RA CLB MESSAGE AND VSI RED BAND UP 2000. I IMMEDIATELY PULLED TO 3000 FPM. CLR OF TFC MESSAGE AT ABOUT 11600. I LEVELED 12000. CAPT ADVISED ATC, I PUSHED DOWN TO 11000 AT ABOUT 1000 OR 1500 FPM. ATC SAID PROCEED DIRECT TO ORD WHEN ABLE AND CHANGE FREQ TO NEXT CTLR. NO VISUAL CONTACT WITH TFC. TCASII SEEMED TO WORK EXACTLY AS ADVERTISED.

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.