Hydraulic and Pneumatic Power Systems (1) When servicing aircraft hydraulic systems, use the type fluid specified in the aircraft manufacturer’s maintenance manual or on the instruction plate affixed to the reservoir or unit. (2) Hydraulic fluids for aircraft are dyed a specific color for each type of fluid. Regarding the above statements, a. only No. 1 is true. b. only No. 2 is true. c. both No. 1 and No. 2 are true.