FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

The correct choice is B, Manufacturer's technical bulletins. Manufacturer's technical bulletins are official documents issued by the aircraft or component manufacturer that provide detailed information about the specific materials, components, and fluids that are compatible with the aircraft. This information is crucial to ensure the safe operation of the aircraft and to prevent any potential damage or safety hazards.

Option A, the Aircraft operator's guide, may contain some information about the compatibility of fluids with aircraft materials, but Manufacturer's technical bulletins are more specific and detailed sources for this information.

Option C, the General aviation handbook, is a good source of general information about aviation practices but may not provide the detailed compatibility information required for specific situations.

Option D, Online aviation forums, may contain some helpful information and insights from other maintenance professionals or enthusiasts, but it may not always provide accurate or official information regarding the compatibility of fire-resistant hydraulic fluid with aircraft materials. It is always best to rely on official sources like Manufacturer's technical bulletins for such critical information.