An mdt air carrier climbed, then descended in response to a TCASII command.

Attributes
ACN	224527
Time
Date	199210
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : iah
State Reference	TX
Altitude	msl bound lower : 3800 msl bound upper : 4200
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : iah tower : den
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3500 flight time type : 200
ASRS Report	224527
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Scattered clouds at about 3000-5000. We were 3600 climbing to assigned altitude of 4000. I noticed a target on TCASII level at 4500, 4 mi, 12 O'clock and opposite direction, informed PF of target and he continued to climb. Upon reaching 3900 we received a TCASII RA 'reduce climb.' PF increased climb, at 4200 I pushed the yoke over and started the descent, at 3800 the target passed behind us and the TCASII resolution stopped. After the incident I asked him what he was thinking. He informed me all he heard was climb. Apparently he did not monitor his vsi or listen to the RA 'descend, now.'

Original NASA ASRS Text

Title: AN MDT ACR CLBED, THEN DSNDED IN RESPONSE TO A TCASII COMMAND.

Narrative: SCATTERED CLOUDS AT ABOUT 3000-5000. WE WERE 3600 CLBING TO ASSIGNED ALT OF 4000. I NOTICED A TARGET ON TCASII LEVEL AT 4500, 4 MI, 12 O'CLOCK AND OPPOSITE DIRECTION, INFORMED PF OF TARGET AND HE CONTINUED TO CLB. UPON REACHING 3900 WE RECEIVED A TCASII RA 'REDUCE CLB.' PF INCREASED CLB, AT 4200 I PUSHED THE YOKE OVER AND STARTED THE DSCNT, AT 3800 THE TARGET PASSED BEHIND US AND THE TCASII RESOLUTION STOPPED. AFTER THE INCIDENT I ASKED HIM WHAT HE WAS THINKING. HE INFORMED ME ALL HE HEARD WAS CLB. APPARENTLY HE DID NOT MONITOR HIS VSI OR LISTEN TO THE RA 'DSND, NOW.'

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.