Hello all. I have been tasked to calculate the MTBF of a system in an AEROSTATIC environment. Can MIL-HDBK-217 be used for this calculation? I am not finding AEROSTATIC environment as a choice for MIL-HBKD-217. What is the closest environment that could be used in liew of AEROSTASTIC using the Handbook? IF MIL-HDBK-217 cannot be used, what other software or procedure can be used to caculate MTBF in this type of environment? Thank you.