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What: TAAG Angola Airlines Boeing 777-300 en route from Lisbon (Portugal) to Luanda (Angola)
When: Feb 27th 2012
Who: 197 passengers
Why: On departure from Lisbon, ATC said that the frequency was blocked. The pilots began responding to Lisbon on the wrong frequency, squawking loss of communication.
Communication was restored, then was lost again, intermittently. ATC directed that the other radio be turned off and changed to the correct frequency. The radio began blocking frequencies again, and pilots returned to Lisbon for a safe landing.
Eighty minutes after departure (ten minutes after the safe landing) the airport resumed normal operations.
All airlines out of Angola are on the EU banned list, banned from flying in the European union, with the exception of 3 Boeing 777-200s, 2 Boeing 777-300 and 4 Boeing 737-700s of TAAG Angola Airlines.