ARTCC radar controller missed incorrect readback on altitude descending to for an small transport, aircraft later involved in operational error in TRACON airspace.

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Attributes
ACN	164798
Time
Date	199012
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : gdm airport : bos
State Reference	MA
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : bos tower : ewr
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other descent other
Route In Use	enroute airway : bos enroute airway : zbw
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	164798
Person 2
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Small transport X was en route to bos at 17000'. Approximately 25 NM west of gdm I instructed small transport X to descend to 7000' (this is the LOA altitude for propellers landing bos). Aircraft read back 9000'. My trnee, manual controller, and I all missed the incorrect readback. There were later reports from small transport X that he was in moderate to severe turbulence at 17000'. Aircraft was handed off to bos approach at 9000' instead of 7000'. Bos approach subsequently descend a medium large transport Y jet from 11000' to 9000', creating (for them) an operational error.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR MISSED INCORRECT READBACK ON ALT DESCENDING TO FOR AN SMT, ACFT LATER INVOLVED IN OPERATIONAL ERROR IN TRACON AIRSPACE.

Narrative: SMT X WAS ENRTE TO BOS AT 17000'. APPROX 25 NM W OF GDM I INSTRUCTED SMT X TO DSND TO 7000' (THIS IS THE LOA ALT FOR PROPS LNDG BOS). ACFT READ BACK 9000'. MY TRNEE, MANUAL CTLR, AND I ALL MISSED THE INCORRECT READBACK. THERE WERE LATER RPTS FROM SMT X THAT HE WAS IN MODERATE TO SEVERE TURB AT 17000'. ACFT WAS HANDED OFF TO BOS APCH AT 9000' INSTEAD OF 7000'. BOS APCH SUBSEQUENTLY DSND A MLG Y JET FROM 11000' TO 9000', CREATING (FOR THEM) AN OPERROR.

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.