Government X descended into approach control without coordination. Operational deviation.

Attributes
ACN	122305
Time
Date	198909
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : rdv
State Reference	NC
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc tracon : fay
Operator	other
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	enroute : direct enroute airway : zdc
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 21
ASRS Report	122305
Person 2
Function	controller : radar
Qualification	controller : non radar
Events
Anomaly	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 Inter Facility Coordination Failure

Narrative:

I was OJT a deviation controller. The trnee issued descent clearance to government X from FL180 to 11000'. The pilot read back, '10000 altimeter .' I thought the pilot said 11000' and so did the trnee. However, the tape recording proved the pilot mistakenly heard the wrong altitude assigned, and I missed the pilot's readback. 2 wrongs don't make a right, as the medium large transport descended into approach control airspace west/O coordination, hence a system deviation. Perhaps the fact that I was OJT contributed to this situation, as we had just worked heavy traffic and were discussing speed control as government X was being given the clearance. This is the only reason I feel I missed the readback, because I honestly thought the pilot read back the correct altitude.

Original NASA ASRS Text

Title: GOV X DESCENDED INTO APCH CTL WITHOUT COORD. OPERATIONAL DEVIATION.

Narrative: I WAS OJT A DEV CTLR. THE TRNEE ISSUED DSCNT CLRNC TO GOV X FROM FL180 TO 11000'. THE PLT READ BACK, '10000 ALTIMETER .' I THOUGHT THE PLT SAID 11000' AND SO DID THE TRNEE. HOWEVER, THE TAPE RECORDING PROVED THE PLT MISTAKENLY HEARD THE WRONG ALT ASSIGNED, AND I MISSED THE PLT'S READBACK. 2 WRONGS DON'T MAKE A RIGHT, AS THE MLG DSNDED INTO APCH CTL AIRSPACE W/O COORD, HENCE A SYS DEVIATION. PERHAPS THE FACT THAT I WAS OJT CONTRIBUTED TO THIS SITUATION, AS WE HAD JUST WORKED HEAVY TFC AND WERE DISCUSSING SPD CTL AS GOV X WAS BEING GIVEN THE CLRNC. THIS IS THE ONLY REASON I FEEL I MISSED THE READBACK, BECAUSE I HONESTLY THOUGHT THE PLT READ BACK THE CORRECT ALT.

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.