Tag: Maintenance Minute
Here’s a tip to help troubleshoot a customer bleed air system. Different manufacturers have their own nomenclatures, but this is the system that takes hot engine bleed air and routes it for cabin heating, cooling turbines, particle separators, and the like.
On occasion, the bleed air problem only manifests itself when the aircraft is running. One way to check this without running an engine is to apply shop air to the aircraft bleed air system. The picture below is a work aid version used for Bell 212/412, MBB BO105, Bell 222/230, or any aircraft with a 209-type bleed air “deck” valve. [Read More...]
One item that used to perplex me was reinstalling the K-FLEX drive shaft on a Bell 407. It wasn’t too bad on the earlier models. But once the aft T/R driveshaft flywheel was “incorporated” to form the new thicker rotorbrake (R/B) disc up front, it became a little tighter getting the shaft to drop in.
However, when Bell increased the size of the transmission drive flange it became downright impossible without some persuasion. That was until a fellow wrench, Kevin H., showed me the light. This tip is directed at the latter K-FLEX installation. While it’s a bit hard to explain, it’s even harder to draw a diagram. But it works. You just need to hold your mouth right. [Read More...]