Mechanical Specification

Thermal Loads

Domain(s)

Space

System(s)

Satellite

Specialty

MECH

Profile(s)

CH, COMM, EXP, PS, RP, SMAC

Specification Type

Recommendation

Yield and ultimate thermal loads for hardware subject to thermal tests shall be calculated by either Alternate A or Alternate B, as defined below, whichever produces the maximum load. These thermal loads are not to be used for fatigue.

Alternate A:

Yield thermal load (YTL) = Predicted thermal load (PTL) x 1.32

Ultimate thermal load (UTL) = (PTL) x 1.50

Alternate B:

YTL = (Predicted temperature +/- 27 deg F) x 1.10

UTL = (Predicted temperature +/- 27 deg F) x 1.25

For hardware not subject to thermal testing, the following method is used to calculate yield and ultimate thermal loads.

YTL = PTL x 1.50

UTL = PTL x 2.00