That's interesting. How did DEF get in the jet fuel?
This is a big problem in FBO safety. Newer trucks have engines that require DEF, which is stored in a tank on the truck. Those same trucks usually have the capability of mixing in Prist with the jet fuel, and the Prist is stored in a tank on the truck too. When filling those tanks, it's easy to confuse one for the other.
There have been, last I checked (which has been about ~3 years at least), at least 8 incidents of DEF getting into jet fuel, and at least one instance of it causing dual flameout causing a jet to be dead-sticked to an airport.
IMO, someone needs to develop an electric refueling truck, and soon. Also, at least one company has developed a truck that has a prist tank that can detect if DEF is added.
That makes sense. We don't use Prist in transport jets. We have fuel/oil heat exchangers where heat is removed from the oil and transferred to the fuel.
Some places have jet fuel that is premixed, others have trucks that mix (or don't). I wouldn't bet that "we don't use Prist in transport jets" is always true - I wouldn't be surprised at all if some of your smaller out-stations, especially for a regional, have fuel that's premixed or comes from a truck that can mix in Prist. I would say the more accurate version of your statement is "We don't require Prist in transport jets." It's still quite possible to have a contamination issue if you're taking fuel from a diesel truck that services both Jet-A- and Jet-A+.
To pilots who know this operation well and present and ex Airline pilots:
Is 11 hrs-duty a long time that may have contributed to Fatigue of the pilots?
Is this type of duty time within the FAR guidelines for 121 and 135 parts, or maybe even within NetJet or an Airline own guidelines?
Part 117 governs duty time for part 121 operators. For Part 135, it's Subpart F (135.263 through 135.273) and generally speaking we're limited to 14 hours. For a 91K operator like NetJets, it's 91.1059 which is very similar and generally limits to 14 hours.
However, fatigue isn't binary. After 11 hours, you're definitely not as sharp as you were after 1 hour.
For the crew. Do they change crews at NetJets in one day? I had thought only Airlines would do it…..
Heck, even small operators do it.
That is correct. It’s more for CG issues from fuel trapped in the tail tank than it is for over weight landings.
Interesting... If we become unable to transfer fuel from our ventral tank, we simply have to land before we get down to a certain weight, which is just barely below max landing weight. No dump available.