<< >> NASA ASRS Report 125340, September 1989

A departure air carrier was issued an altitude restriction and a turn due to unknown traffic in the TCA.

Attributes
ACN	125340
Time
Date	198909
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 7200 msl bound upper : 7500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak artcc : zau
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : initial
Route In Use	departure sid : sid
Flight Plan	IFR
Aircraft 2
Make Model Name	Large Transport
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : cfi pilot : commercial
Experience	flight time last 90 days : 60 flight time total : 3600 flight time type : 30
ASRS Report	125340
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : far other anomaly other other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X was cleared to depart sfo runway 1R on a sfo 3 SID (heading 030) with a climb to FL230. We climbed through an overcast with tops at approximately 4500' at a climb rate close to 3500 FPM. Passing 6800' a bay departure ATC instructor broke in on the ATC trainee and ordered a level off at 7000' and left turn to 310 degree due to conflicting traffic at 7500'. The captain immediately disconnected the autoplt and initiated a level off and turn. Rate of climb zeroed at 7200'. Since the other traffic was never sighted, the proximity cannot be estimated from the cockpit. The horizontal planes occupied by the 2 aircraft were separated by 300' if the ATC readout was correct.

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Original NASA ASRS Text

Title: A DEP ACR WAS ISSUED AN ALT RESTRICTION AND A TURN DUE TO UNKNOWN TRAFFIC IN THE TCA.

Narrative: ACR X WAS CLRED TO DEPART SFO RWY 1R ON A SFO 3 SID (HEADING 030) WITH A CLIMB TO FL230. WE CLIMBED THROUGH AN OVERCAST WITH TOPS AT APPROX 4500' AT A CLIMB RATE CLOSE TO 3500 FPM. PASSING 6800' A BAY DEP ATC INSTRUCTOR BROKE IN ON THE ATC TRAINEE AND ORDERED A LEVEL OFF AT 7000' AND LEFT TURN TO 310 DEG DUE TO CONFLICTING TFC AT 7500'. THE CAPT IMMEDIATELY DISCONNECTED THE AUTOPLT AND INITIATED A LEVEL OFF AND TURN. RATE OF CLIMB ZEROED AT 7200'. SINCE THE OTHER TFC WAS NEVER SIGHTED, THE PROX CANNOT BE ESTIMATED FROM THE COCKPIT. THE HORIZONTAL PLANES OCCUPIED BY THE 2 ACFT WERE SEPARATED BY 300' IF THE ATC READOUT WAS CORRECT.

Data retrieved from NASA's ASRS site as of August 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.