Altitude heading track deviation during a flight crew response to a TCASII RA with crossing traffic ...

Attributes
ACN	228888
Time
Date	199212
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : egpx
State Reference	FO
Altitude	msl bound lower : 29000 msl bound upper : 29300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : egpx
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
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 : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 100 flight time type : 2000
ASRS Report	228888
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Airlines flight lgw-iah cruising FL290, IMC, under radar vector from scottish control, frequency 135.85, squawking abcd, received TCASII TA -- noted red symbol at 11:30 close in. Approximately 10 seconds later, received 'climb' command 1500 FPM from TCASII. Noted TCASII altitude differential at 700 ft. Captain disconnected autoplt, turned right and started immediate climb. Spotted aircraft at 10 O'clock about 1000 ft away (IMC) appeared to be an air carrier medium large transport. We climbed to FL293 to resolve conflict. Passed above and ahead of other aircraft, then received 'clear of conflict' from TCASII and returned to FL290 and assigned course. I do not believe we came closer than 1000 ft to other aircraft.

Original NASA ASRS Text

Title: ALT HDG TRACK DEV DURING A FLC RESPONSE TO A TCASII RA WITH XING TFC IN IMC CONDITIONS.

Narrative: AIRLINES FLT LGW-IAH CRUISING FL290, IMC, UNDER RADAR VECTOR FROM SCOTTISH CTL, FREQ 135.85, SQUAWKING ABCD, RECEIVED TCASII TA -- NOTED RED SYMBOL AT 11:30 CLOSE IN. APPROX 10 SECONDS LATER, RECEIVED 'CLB' COMMAND 1500 FPM FROM TCASII. NOTED TCASII ALT DIFFERENTIAL AT 700 FT. CAPT DISCONNECTED AUTOPLT, TURNED R AND STARTED IMMEDIATE CLB. SPOTTED ACFT AT 10 O'CLOCK ABOUT 1000 FT AWAY (IMC) APPEARED TO BE AN ACR MLG. WE CLBED TO FL293 TO RESOLVE CONFLICT. PASSED ABOVE AND AHEAD OF OTHER ACFT, THEN RECEIVED 'CLR OF CONFLICT' FROM TCASII AND RETURNED TO FL290 AND ASSIGNED COURSE. I DO NOT BELIEVE WE CAME CLOSER THAN 1000 FT TO OTHER ACFT.

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.

Altitude heading track deviation during a flight crew response to a TCASII RA with crossing traffic in IMC conditions.