1. SCOPE:

1.1 Scope:

This Specification covers constant displacement hydraulic motors, generally remotely mounted, using hydraulic fluid under pressure as the energy transfer medium for driving various accessories. Hydraulic motors shall be suitable for use in aircraft hydraulic systems conforming to and as defined in MIL-H-5440 and MIL-H-8891 as applicable.

1.2 Classification:

Aircraft constant displacement hydraulic motors shall be of the following types and classes, as specified (see 6.2):

Class 1500. 1500 psi (103 Bar) rated inlet pressure

Class 3000. 3000 psi (207 Bar) rated inlet pressure

Class 4000. 4000 psi (276 Bar) rated inlet pressure

Category A. Secondary. Secondary flight controls, winches, gun drives, constant speed drives, transfer packages, etc.

Category B. Primary. Primary flight controls, modulating slats, etc. See Para 4.6.15 for utility and primary motor endurance test requirements.