<< >> NASA ASRS Report 134816, January 1990

A departure air carrier large transport experiences loss of separation with another departure aircraft on a crossing runway departure.

Attributes
ACN	134816
Time
Date	199001
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : msy
State Reference	LA
Altitude	agl bound lower : 0 agl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : msy tower : msy
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : initial climbout : takeoff
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : takeoff climbout : initial cruise other
Route In Use	departure other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : commercial pilot : instrument
Experience	flight time last 90 days : 200 flight time total : 5300 flight time type : 2000
ASRS Report	134816
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation non adherence other other anomaly other other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 5000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation Intra Facility Coordination Failure Operational Error
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Takeoff clearance was given to our aircraft for runway 19, referencing a light twin (low wing) departing on runway 10. Tower directed us to maintain visibility on the twin, said he would be departing to the southwest, and further advised there was traffic on short final for our runway. As we began our roll the twin was beginning a slow turn to the right, beyond the runway intersection and to the left of our takeoff path. As we became airborne the twin appeared to be paralleling our flight path to the left. I made a slight right turn for sep, at which time the twin began a shallow turn to the right, across our flight path. I made a turn to the left, positive but not excessive, to pass behind the twin. We were approximately co-altitude at the time. We were switching to departure control at the time, who seemed concerned that we had the traffic in sight. Contributing factors include: 1) simultaneous takeoffs on perpendicular runways, 2) uncertainty on our crew's part as to the intention of the pilot of the twin, 3) traffic on short final behind us as we held in position for takeoff.

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Original NASA ASRS Text

Title: A DEP ACR LGT EXPERIENCES LOSS OF SEPARATION WITH ANOTHER DEP ACFT ON A CROSSING RWY DEP.

Narrative: TKOF CLRNC WAS GIVEN TO OUR ACFT FOR RWY 19, REFERENCING A LIGHT TWIN (LOW WING) DEPARTING ON RWY 10. TWR DIRECTED US TO MAINTAIN VIS ON THE TWIN, SAID HE WOULD BE DEPARTING TO THE SW, AND FURTHER ADVISED THERE WAS TFC ON SHORT FINAL FOR OUR RWY. AS WE BEGAN OUR ROLL THE TWIN WAS BEGINNING A SLOW TURN TO THE RIGHT, BEYOND THE RWY INTXN AND TO THE LEFT OF OUR TKOF PATH. AS WE BECAME AIRBORNE THE TWIN APPEARED TO BE PARALLELING OUR FLT PATH TO THE LEFT. I MADE A SLIGHT RIGHT TURN FOR SEP, AT WHICH TIME THE TWIN BEGAN A SHALLOW TURN TO THE RIGHT, ACROSS OUR FLT PATH. I MADE A TURN TO THE LEFT, POSITIVE BUT NOT EXCESSIVE, TO PASS BEHIND THE TWIN. WE WERE APPROX CO-ALT AT THE TIME. WE WERE SWITCHING TO DEP CTL AT THE TIME, WHO SEEMED CONCERNED THAT WE HAD THE TFC IN SIGHT. CONTRIBUTING FACTORS INCLUDE: 1) SIMULTANEOUS TKOFS ON PERPENDICULAR RWYS, 2) UNCERTAINTY ON OUR CREW'S PART AS TO THE INTENTION OF THE PLT OF THE TWIN, 3) TFC ON SHORT FINAL BEHIND US AS WE HELD IN POS FOR TKOF.

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.