Human Performanceeasy#968
If smoke or fumes are detected in the cockpit, the crew should:
A
ignore it
B
open a window
C
don oxygen masks, identify the source, and follow the QRH smoke/fumes checklist
CorrectD
reduce altitude only
Explanation
The immediate action is to go on oxygen (100%), identify and isolate the source if possible, and follow established emergency procedures.
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