Fgt pilot heard and read back a wrong altitude and descended into adjacent airspace without required coordination on the part of the center controller.

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Attributes
ACN	94459
Time
Date	198809
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fmh
State Reference	MA
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw tracon : fmh
Operator	other
Make Model Name	Fighter
Flight Phase	cruise other descent other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 4 controller non radar : 4 controller radar : 2
ASRS Report	94459
Person 2
Affiliation	government : military
Function	flight crew : single pilot
Qualification	pilot : military
Events
Anomaly	altitude deviation : overshoot non adherence : published procedure other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

Fgt X was issued a descent clearance to 11000'. Pilot misunderstood and read back 10000'. An airspace deviation of otis approach control airspace.

Original NASA ASRS Text

Title: FGT PLT HEARD AND READ BACK A WRONG ALT AND DESCENDED INTO ADJACENT AIRSPACE WITHOUT REQUIRED COORD ON THE PART OF THE CENTER CTLR.

Narrative: FGT X WAS ISSUED A DSCNT CLRNC TO 11000'. PLT MISUNDERSTOOD AND READ BACK 10000'. AN AIRSPACE DEVIATION OF OTIS APCH CTL AIRSPACE.

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.