Altitude deviation altitude undershot in climb.

Attributes
ACN	247742
Time
Date	199307
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : eon airport : ord
State Reference	IL
Altitude	msl bound lower : 9200 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : phl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct enroute airway : ord
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 4900 flight time type : 700
ASRS Report	247742
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : far other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were climbing out, departing ord proceeding direct to eon VOR. TCASII indicated traffic on the nose, 10 mi, about 500 ft above. We started to look carefully but couldn't see him. I decreased the rate of climb. ATC radar had not called out the traffic. The TCASII gave a TA at about 5 mi on the nose, 300 ft high. In about 10 seconds the TCASII gave an RA with traffic about 3 mi on the nose, 200 ft high. The RA was to descend 2000-2500 FPM. We achieved the 2500 FPM descent in 5-10 seconds. We sighted the traffic at 10-11 O'clock, heading north. It was probably at 10500 ft VFR. We were descending through 10000 ft. The traffic looked like a light twin. The RA ceased as the traffic passed off the left wing. We had descended to about 9200 ft before starting to climb again. The event was noted to ATC. ATC called out the traffic about the time we got the RA and were initiating the required descent.

Original NASA ASRS Text

Title: ALTDEV ALT UNDERSHOT IN CLB.

Narrative: WE WERE CLBING OUT, DEPARTING ORD PROCEEDING DIRECT TO EON VOR. TCASII INDICATED TFC ON THE NOSE, 10 MI, ABOUT 500 FT ABOVE. WE STARTED TO LOOK CAREFULLY BUT COULDN'T SEE HIM. I DECREASED THE RATE OF CLB. ATC RADAR HAD NOT CALLED OUT THE TFC. THE TCASII GAVE A TA AT ABOUT 5 MI ON THE NOSE, 300 FT HIGH. IN ABOUT 10 SECONDS THE TCASII GAVE AN RA WITH TFC ABOUT 3 MI ON THE NOSE, 200 FT HIGH. THE RA WAS TO DSND 2000-2500 FPM. WE ACHIEVED THE 2500 FPM DSCNT IN 5-10 SECONDS. WE SIGHTED THE TFC AT 10-11 O'CLOCK, HDG N. IT WAS PROBABLY AT 10500 FT VFR. WE WERE DSNDING THROUGH 10000 FT. THE TFC LOOKED LIKE A LIGHT TWIN. THE RA CEASED AS THE TFC PASSED OFF THE L WING. WE HAD DSNDED TO ABOUT 9200 FT BEFORE STARTING TO CLB AGAIN. THE EVENT WAS NOTED TO ATC. ATC CALLED OUT THE TFC ABOUT THE TIME WE GOT THE RA AND WERE INITIATING THE REQUIRED DSCNT.

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.