<< >> NASA ASRS Report 372852, June 1997

C402 aircraft was cleared to stop climb for traffic and traffic continued descent to reporter aircraft altitude resulting in loss of separation.

Attributes
ACN	372852
Time
Date	199706
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bos artcc : zmp
Operator	common carrier : air taxi
Make Model Name	Cessna 402/402C/B379 Businessliner/Utiliner
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3700 flight time type : 275
ASRS Report	372852
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

IFR, bos direct ack filed 5000 ft. ATC stopped climb at 4000 ft heading 150 degrees. Jetstream was seen descending right to left approximately 060 degree heading descent stopped at 4000 ft. I called traffic right to left 10 seconds before jetstream called. ATC said jetstream was cleared to 5000 ft, jetstream said cleared to 4000 ft. Poor vector from control. Dangerous altitude assignment. Dangerous situational awareness of ATC. If in IMC no visual would have been available, very high possibility of midair collision. Control stopped my climb at an improper altitude for heading.

Related reports:

• King air told to maintain visual separation with brasilia. H...
• Operational error less than standard separation when small c...

	Enter your search terms Submit search form
	Web www.37000feet.com

Original NASA ASRS Text

Title: C402 ACFT WAS CLRED TO STOP CLB FOR TFC AND TFC CONTINUED DSCNT TO RPTR ACFT ALT RESULTING IN LOSS OF SEPARATION.

Narrative: IFR, BOS DIRECT ACK FILED 5000 FT. ATC STOPPED CLB AT 4000 FT HDG 150 DEGS. JETSTREAM WAS SEEN DSNDING R TO L APPROX 060 DEG HDG DSCNT STOPPED AT 4000 FT. I CALLED TFC R TO L 10 SECONDS BEFORE JETSTREAM CALLED. ATC SAID JETSTREAM WAS CLRED TO 5000 FT, JETSTREAM SAID CLRED TO 4000 FT. POOR VECTOR FROM CTL. DANGEROUS ALT ASSIGNMENT. DANGEROUS SITUATIONAL AWARENESS OF ATC. IF IN IMC NO VISUAL WOULD HAVE BEEN AVAILABLE, VERY HIGH POSSIBILITY OF MIDAIR COLLISION. CTL STOPPED MY CLB AT AN IMPROPER ALT FOR HEADING.

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.