A B747-400 flight crew receives a message via CPDLC to climb in a block altitude while flying the Pacific in ZOA airspace, then receives an HF radio call from ARTCC rescinding the clearance.
Synopsis
A B747-400 flight crew receives a message via CPDLC to climb in a block altitude while flying the Pacific in ZOA airspace, then receives an HF radio call from ARTCC rescinding the clearance.
Narrative
Rewritten in plain English from NASA’s original all-caps telegraphic report — facts, figures, and terminology preserved.
Received CPDLC clearance for block altitude FL350/FL370. Began climb to FL370 and received HF radio call to rescind climb due to no clearance. Have written documentation of ATC clearance received over printer through CPDLC.
Show the original NASA report (verbatim, telegraphic)
RECEIVED CPDLC CLRNC FOR BLOCK ALT FL350/FL370. BEGAN CLB TO FL370 AND RECEIVED HF RADIO CALL TO RESCIND CLB DUE TO NO CLRNC. HAVE WRITTEN DOCUMENTATION OF ATC CLRNC RECEIVED OVER PRINTER THROUGH CPDLC.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.