Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed As Precaution
Aircraft
In cruise at FL350 Level 1 SYS 3 Air Off alert. Ran QRH and was messaging Dispatch to check weather and if they wanted us to continue with Wing Anti Ice unavailable. Checked weather at ZZZ1 ZZZ2 ZZZ3 about that time we got a Level 3 Manf Number 3 Fail alert. ZZZ was nearest suitable airport.
Returned to cockpit to find Captain working a QRH problem. We had an Air System 3 Off alert at cruise; a Level 1 alert. The air system schematic showed our manifold 3 in red and the MANF light red on the overhead. We were discussing the listed consequences. Not to pressurize the manifold if it was failed and lack of anti ice. We would have needed anti-ice to continue to destination. As the Captain was continuing to work through the QRH we received a momentary manifold fail. The manifold fail called for a diversion to the nearest suitable airport. We reviewed the weather and the captain decided to divert to the closest and it had VFR weather.
MD11 flight crew experiences a Level 1 SYS 3 Air Off alert at FL350; followed shortly by a Level 3 Manf Number 3 Fail alert. Crew diverts to the nearest suitable airport.