While a lot of these recommendations are useful as a common practice, I think the use of the 2.4 was intended to minimise/eliminate most of these potential noise problems. The frequency range of the turbine pump and other noise sources in our models is lower than that of the 2.4. Having said that, it is not wise to "assume" we are 100% safe from any noise in our jets. A strong enough EMI/noise source can mask the Rx signal (multiple rx's helps thu). I think we are a bit more safe with our traditional installations in jets using the 2.4 vs the 72 mhz..