B777 line check captain reported suspected GPS jamming during cruise.

Attributes
ACN	1733501
Time
Date	202003
Place
Locale Reference	LTAA.ARTCC
State Reference	FO
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Check Pilot
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 135 Flight Crew Total 15938 Flight Crew Type 8869
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Inflight Event / Encounter Other / Unknown

Narrative:

Upon crossing into the ankara fir after crossing tombi intersection; our GPS was jammed intermittently for about 5 minutes. All SOP complied with.

Original NASA ASRS Text

Title: B777 Line check Captain reported suspected GPS jamming during cruise.

Narrative: Upon crossing into the Ankara FIR after crossing TOMBI intersection; our GPS was jammed intermittently for about 5 minutes. All SOP complied with.

Data retrieved from NASA's ASRS site 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.