B777 first officer reported satellite communication difficulties on a trans-pacific polar route.

Attributes
ACN	1518695
Time
Date	201802
Local Time Of Day	0601-1200
Place
Locale Reference	CZEG.ARTCC
State Reference	AB
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air/Ground Communication
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 210 Flight Crew Type 8480
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

Unable to log off of inmarsat and log on to iridium by all 4 crew members over several hours above 78 degrees north latitude.

Original NASA ASRS Text

Title: B777 First Officer reported satellite communication difficulties on a trans-Pacific polar route.

Narrative: Unable to log off of Inmarsat and log on to Iridium by all 4 crew members over several hours above 78 degrees north latitude.

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.