Description / Abstract:
1. SCOPE:
This SAE Aerospace Information Report (AIR) presents a discussion of
drag torques of engine accessories operating at cold temperature.
Various conditions of temperature, speed, and acceleration rates are
reviewed showing the merits of each method and recommending a standard
test method.
1.1 Purpose:
The purpose of this Aerospace Information Report is to present a brief
discussion of the drag torques of aircraft accessories operating at
cold temperatures, specifically −65 °F. The parameters
affecting the magnitude of torque at various speeds and acceleration
rates are reviewed. In conclusion, this report establishes the
difference in accessory torque characteristics that are obtained by
various test procedures and recognizes the need for a standard test
method.