<< >> NASA ASRS Report 244838, June 1993

Altitude deviation altitude excursion occurs as flight crew response to TCASII RA on aircraft who is same direction traffic.

Attributes
ACN	244838
Time
Date	199306
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 5600 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	arrival other arrival star : star enroute airway : zfw
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 275 flight time total : 19000 flight time type : 4500
ASRS Report	244838
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
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 : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 5280 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While inbound to kaven intersection on scy arrival dfw approach control informed us that an light transport jet was overtaking us at 7000 ft. We observed aircraft on TCASII in that location that had visual contact with us. A few mins later we had visual contact at 9 O'clock 7000 ft. Approach asked if we could maintain visual contact so he could let aircraft Y down to 5000 MSL. We confirmed that we could. As aircraft passed through our altitude, pulling away slowly, we received an RA alert calling for a descent. The first officer flew the aircraft down as indicated until alert went out at 5600 ft. I notified approach we were deviating. When we reached 5600 ft, we started back to 6000. Approach control asked why we deviated just because we got RA with aircraft in sight. We informed them that we are to respond to RA's at all times. Ps: ATC was notified as aircraft was passing through 5900 MSL that we were deviating from assigned altitude.

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Original NASA ASRS Text

Title: ALTDEV ALT EXCURSION OCCURS AS FLC RESPONSE TO TCASII RA ON ACFT WHO IS SAME DIRECTION TFC.

Narrative: WHILE INBOUND TO KAVEN INTXN ON SCY ARR DFW APCH CTL INFORMED US THAT AN LTT JET WAS OVERTAKING US AT 7000 FT. WE OBSERVED ACFT ON TCASII IN THAT LOCATION THAT HAD VISUAL CONTACT WITH US. A FEW MINS LATER WE HAD VISUAL CONTACT AT 9 O'CLOCK 7000 FT. APCH ASKED IF WE COULD MAINTAIN VISUAL CONTACT SO HE COULD LET ACFT Y DOWN TO 5000 MSL. WE CONFIRMED THAT WE COULD. AS ACFT PASSED THROUGH OUR ALT, PULLING AWAY SLOWLY, WE RECEIVED AN RA ALERT CALLING FOR A DSCNT. THE FO FLEW THE ACFT DOWN AS INDICATED UNTIL ALERT WENT OUT AT 5600 FT. I NOTIFIED APCH WE WERE DEVIATING. WHEN WE REACHED 5600 FT, WE STARTED BACK TO 6000. APCH CTL ASKED WHY WE DEVIATED JUST BECAUSE WE GOT RA WITH ACFT IN SIGHT. WE INFORMED THEM THAT WE ARE TO RESPOND TO RA'S AT ALL TIMES. PS: ATC WAS NOTIFIED AS ACFT WAS PASSING THROUGH 5900 MSL THAT WE WERE DEVIATING FROM ASSIGNED ALT.

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.