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

Attributes
ACN	253233
Time
Date	199310
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dqn
State Reference	OH
Altitude	msl bound lower : 26800 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 75 flight time total : 12000 flight time type : 1500
ASRS Report	253233
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
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
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 1000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

This report addresses a TCASII RA to 'descend' which we received while climbing to FL270. We were climbing to FL270 at approximately 1500 FPM. Oncoming traffic, another air carrier medium large transport, was level at FL280. At 26500 ft and climbing we received a TA and at 26800 ft we received an RA to descend. VNAV had captured the altitude and was leveling, however, we disconnected the autoplt and automatic throttles to manually fly and comply with the RA. We were level at FL270 before we were actually able to change the direction of the aircraft and begin a descent. TCASII 'clear of conflict' was issued at 26800 ft. We advised ATC of the TCASII RA and that we had to descend. When the clear of conflict was issued we returned to FL270. I feel this occurred due to our high closure rate with the other aircraft even though our rate of climb was only moderate.

Original NASA ASRS Text

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

Narrative: THIS RPT ADDRESSES A TCASII RA TO 'DSND' WHICH WE RECEIVED WHILE CLBING TO FL270. WE WERE CLBING TO FL270 AT APPROX 1500 FPM. ONCOMING TFC, ANOTHER ACR MLG, WAS LEVEL AT FL280. AT 26500 FT AND CLBING WE RECEIVED A TA AND AT 26800 FT WE RECEIVED AN RA TO DSND. VNAV HAD CAPTURED THE ALT AND WAS LEVELING, HOWEVER, WE DISCONNECTED THE AUTOPLT AND AUTO THROTTLES TO MANUALLY FLY AND COMPLY WITH THE RA. WE WERE LEVEL AT FL270 BEFORE WE WERE ACTUALLY ABLE TO CHANGE THE DIRECTION OF THE ACFT AND BEGIN A DSCNT. TCASII 'CLR OF CONFLICT' WAS ISSUED AT 26800 FT. WE ADVISED ATC OF THE TCASII RA AND THAT WE HAD TO DSND. WHEN THE CLR OF CONFLICT WAS ISSUED WE RETURNED TO FL270. I FEEL THIS OCCURRED DUE TO OUR HIGH CLOSURE RATE WITH THE OTHER ACFT EVEN THOUGH OUR RATE OF CLB WAS ONLY MODERATE.

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.