First officer of air carrier large transport aircraft deviated from assigned altitude in response to...

Attributes
ACN	218556
Time
Date	199208
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gld
State Reference	KS
Altitude	msl bound lower : 31000 msl bound upper : 31200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
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 : 8300 flight time type : 2700
ASRS Report	218556
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At cruise over gld out of dfw en route to yyc. Noticed a target approaching us from about the 9 O'clock position in a climb. We were level at FL310. The target continued to climb and when it got to 1000 ft below us and continued its ascent our TCASII ordered 'climb.' we climbed about 200 ft. The target began a right turn and leveled. Our TCASII ordered 'monitor vertical speed' and we leveled. The conflict resolved, we returned to FL310. Upon calling center, found we had lost radio contact. Another aircraft relayed a new frequency to us. And we continued. We were at our assigned altitude and on course. Center never mentioned the incident.

Original NASA ASRS Text

Title: FO OF ACR LGT ACFT DEVIATED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: AT CRUISE OVER GLD OUT OF DFW ENRTE TO YYC. NOTICED A TARGET APCHING US FROM ABOUT THE 9 O'CLOCK POS IN A CLB. WE WERE LEVEL AT FL310. THE TARGET CONTINUED TO CLB AND WHEN IT GOT TO 1000 FT BELOW US AND CONTINUED ITS ASCENT OUR TCASII ORDERED 'CLB.' WE CLBED ABOUT 200 FT. THE TARGET BEGAN A R TURN AND LEVELED. OUR TCASII ORDERED 'MONITOR VERT SPD' AND WE LEVELED. THE CONFLICT RESOLVED, WE RETURNED TO FL310. UPON CALLING CTR, FOUND WE HAD LOST RADIO CONTACT. ANOTHER ACFT RELAYED A NEW FREQ TO US. AND WE CONTINUED. WE WERE AT OUR ASSIGNED ALT AND ON COURSE. CTR NEVER MENTIONED THE INCIDENT.

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.

First officer of air carrier large transport aircraft deviated from assigned altitude in response to a TCASII RA.