This aeronautical standard covers two basic trpes of pressure instrument.Theseare intended for use in measuring fuel@oil or hydrilulic pressures as follows: Type I: Direct Indicating Type 2: Remote IndIcating This aeronauticalstandard does not apply to engine mounted torque meter systems. These PURPOSE: To specify minimum requirements for pressure instruments for use in aircraft@ the operation of which may subject the instruments to the enviromental conditions specified in section 3.3