ZBW controller is concerned with altitude deviation by foreign air carrier.

Attributes
ACN	595878
Time
Date	200310
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	intersection : trait
State Reference	RI
Altitude	msl bound lower : 23400 msl bound upper : 24900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw.artcc tower : boi.tower
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach descent : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : radar
Experience	controller radar : 14 controller time certified in position1 : 11 flight time total : 88
ASRS Report	595878
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	altitude deviation : undershoot altitude deviation : excursion from assigned altitude altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

The aircraft blew his altitude assignment of FL240. He descended to FL234. After the receiving controller questioned him, he climbed to FL249. The supervisor was in on duty and took no action. I thought abnormal flight characteristics on special interest flts going into jfk had to be handled as suspicious. I was concerned along with the radar controller and was surprised nobody called the military.

Original NASA ASRS Text

Title: ZBW CTLR IS CONCERNED WITH ALTDEV BY FOREIGN ACR.

Narrative: THE ACFT BLEW HIS ALT ASSIGNMENT OF FL240. HE DSNDED TO FL234. AFTER THE RECEIVING CTLR QUESTIONED HIM, HE CLBED TO FL249. THE SUPVR WAS IN ON DUTY AND TOOK NO ACTION. I THOUGHT ABNORMAL FLT CHARACTERISTICS ON SPECIAL INTEREST FLTS GOING INTO JFK HAD TO BE HANDLED AS SUSPICIOUS. I WAS CONCERNED ALONG WITH THE RADAR CTLR AND WAS SURPRISED NOBODY CALLED THE MIL.

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.