<< >> NASA ASRS Report 880841, March 2010

An overwater B747-400 declared an emergency; climbed and deviated around weather when they were unable to obtain a timely clearance via cpdlc.

Attributes
ACN	880841
Time
Date	201003
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 9000 Flight Crew Type 4000
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 15000 Flight Crew Type 4000
Events
Anomaly	ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence

Narrative:

Approaching enroute thunderstorms we requested a climb to FL350 and a deviation left 30 NM from ATC; via cpdlc. We requested the deviation twice with no response; so we declared an emergency via cpdlc and began the deviation. Shortly thereafter; ATC granted the climb and then the deviation. We canceled the emergency and continued with no incident. We notified dispatch of the declaration and canceling of the emergency and the deviation.

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Original NASA ASRS Text

Title: An overwater B747-400 declared an emergency; climbed and deviated around weather when they were unable to obtain a timely clearance via CPDLC.

Narrative: Approaching enroute thunderstorms we requested a climb to FL350 and a deviation Left 30 NM from ATC; via CPDLC. We requested the deviation twice with no response; so we declared an emergency via CPDLC and began the deviation. Shortly thereafter; ATC granted the climb and then the deviation. We canceled the emergency and continued with no incident. We notified dispatch of the declaration and canceling of the emergency and the deviation.

Data retrieved from NASA's ASRS site as of April 2012 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.