Which manual contains information on de-icing fluid?

The Flight Crew Operating Manual (FCOM) is the correct choice because it serves as a comprehensive guide for flight crews and includes detailed procedures, operational limitations, and performance data relevant to flight operations. De-icing fluid information is vital for safe operations in icy conditions, and the FCOM typically contains specific instructions on when and how to apply de-icing fluids, their types, and the implications on aircraft performance.

In contrast, the Aircraft Maintenance Manual (AMM) primarily focuses on maintenance procedures and technical information relevant to the maintenance personnel rather than operational procedures. The Operations Manual (OM) includes general operational guidelines but is less specific about tasks like de-icing, which are critical during flight operations and thus found in the FCOM. The Pilot's Handbook of Aeronautical Knowledge (PHAK) is an educational resource that covers a variety of aviation topics, but it does not provide the specific procedural details that would be found in the FCOM regarding de-icing fluid application.