<< >> NASA ASRS Report 396582, March 1998

A climbing air carrier overshot his altitude and comes close to the altitude of a descending DH8 on radar vectors into bos.

Attributes
ACN	396582
Time
Date	199803
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	msl bound lower : 6400 msl bound upper : 6400
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bos
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6800 flight time type : 2500
ASRS Report	396582
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were on vectors from bos approach and descending to 6000 ft, heading 090 degrees. ATC advised that a jet flight was climbing to 5000 ft. We were in IMC conditions and I assume the other aircraft was as well. At 6700 ft descending at a rate of 1000 FPM, we received an RA on the conflicting traffic. The first command was to descend. I believe this was due to the present descent rate of our aircraft and the high rate of climb of the other aircraft. After the first command, it was followed by an immediate response to climb. At 6400 ft, the captain immediately complied with the second RA command. I noted at this point the 2 aircraft were 500 ft vertically and approximately 1 mi horizontally separated. At 6800 ft, the TCASII indicated that we were clear of conflict. By my estimate the other aircraft was at 5900 ft and climbing when the RA advised us to climb. The controller immediately instructed the other aircraft to return to 5000 ft. I advised the controller of the RA and that we were continuing our descent to 6000 ft. The flight continued without incident.

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Original NASA ASRS Text

Title: A CLBING ACR OVERSHOT HIS ALT AND COMES CLOSE TO THE ALT OF A DSNDING DH8 ON RADAR VECTORS INTO BOS.

Narrative: WE WERE ON VECTORS FROM BOS APCH AND DSNDING TO 6000 FT, HEADING 090 DEGS. ATC ADVISED THAT A JET FLT WAS CLBING TO 5000 FT. WE WERE IN IMC CONDITIONS AND I ASSUME THE OTHER ACFT WAS AS WELL. AT 6700 FT DSNDING AT A RATE OF 1000 FPM, WE RECEIVED AN RA ON THE CONFLICTING TFC. THE FIRST COMMAND WAS TO DSND. I BELIEVE THIS WAS DUE TO THE PRESENT DSCNT RATE OF OUR ACFT AND THE HIGH RATE OF CLB OF THE OTHER ACFT. AFTER THE FIRST COMMAND, IT WAS FOLLOWED BY AN IMMEDIATE RESPONSE TO CLB. AT 6400 FT, THE CAPT IMMEDIATELY COMPLIED WITH THE SECOND RA COMMAND. I NOTED AT THIS POINT THE 2 ACFT WERE 500 FT VERTLY AND APPROX 1 MI HORIZLY SEPARATED. AT 6800 FT, THE TCASII INDICATED THAT WE WERE CLR OF CONFLICT. BY MY ESTIMATE THE OTHER ACFT WAS AT 5900 FT AND CLBING WHEN THE RA ADVISED US TO CLB. THE CTLR IMMEDIATELY INSTRUCTED THE OTHER ACFT TO RETURN TO 5000 FT. I ADVISED THE CTLR OF THE RA AND THAT WE WERE CONTINUING OUR DSCNT TO 6000 FT. THE FLT CONTINUED WITHOUT INCIDENT.

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.