Studs are back sucking O2 like champs with extra supervision....
Navy trainers resume flying with oxygen monitoring upgrades 30 Sep 2017 Leigh Giangreco
"The US Navy has cleared the Boeing T-45 Goshawk fleet to resume regular flights after a five-month grounding caused by contamination concerns over the system that generates and supplies oxygen to the training jet's pilots.
Student pilots can now resume training, but only on aircraft outfitted with a digital upgrade to the CRU-99 oxygen monitor, called the solid-state oxygen monitor (CRU-123), which provides information on temperature and oxygen pressure.
All T-45 aircraft will have the CRU-123 installed by the end of the second quarter of 2018, a navy spokesman tells FlightGlobal. As of 15 September, the Navy modified 111 of 170 active aircraft with CRU-123s.
After a June review revealed the T-45’s OBOGS does not have a water separator mechanism, which helps prevent contaminants releasing into the aircrew breathing air, the navy also decided to install the separators on the trainer aircraft. Out of the 197 T-45s in the Navy’s fleet, the service has installed a water separator on 146. None of the trainers are able to fly without the CRU-123 or water separator modifications, Joyner says...."
https://www.flightglobal.com/news/ar...ring-u-441678/