One might say, what? Engines are too hot for internal icing. This article threw me for a loop. Please forgive me as I lost the URL for this article but I retained the part of the article which I found very interesting. The main topic of the article was safety for business jets. Ya think this is perhaps a problem with other twins and not just the Beechjet 400? And does anyone have any updates on this?
"The NTSB has also recently called for urgent action from the FAA over a series of high-altitude, dual-engine flameouts involving Beechcraft Beechjet 400 business jets. The latest incident took place in July, when a Beechjet 400 operated by fractional provider Flight Options suddenly lost power while descending from 41,000ft to 33,000ft in IMC. The pilots were able to restart one of the Pratt & Whitney Canada JT15D-5s and land safely. In another incident, in November, another Beechjet 400 had to make a deadstick landing after dual engine failure during a descent from 38,000ft.
The safety board points to P&Ws own investigation into the flameouts, which revealed that with engine anti-icing turned off it was possible for ice to build up on the leading edges of the low-pressure compressor stator, leading to compressor surge and/or flameout. The suggestion is that ice crystals melt as they enter the engine then re-freeze on the stator blades. The NTSB wants the FAA to work with engine and aircraft manufacturers to actively pursue research to develop an ice detector that would alert pilots to internal engine icing."