Carbon dating flaws seal

06-Mar-2015 23:17

The compound planetary gear train 40 is comprised of a plurality of shafts 42 each having a gear 44 that meshes with the gear 25.

The gear 44 engages a portion of the shaft 42, a ring gear 48 and a hub gear 62 which is the input side of the overrunning clutch 60.

Thus if the face seal develops a flaw (due to coke build up on the contact face or grain pull out from the carbon face) the seal leakage is low even if the sealing faces separate. 3 is a blow-up of the turbine section of the air turbine starter of FIG. The air turbine starter 10 has a first housing assembly 12 and a second housing assembly 13.

If 100 to 300 ccs of oil is displaced to the turbine exhaust air without detection by the pilot or ground crew, loss of the air turbine starter by turbine bearing failure is possible.The coke build-up destroys the flatness of the sealing contact surfaces between the rotor and the seal carbon ring.The coke separates the two surfaces resulting in a clearance therebetween.Typically, the air pressure at the inlet 16 is in the range of 30-40 psig.Within the air turbine starter 10, the housing assemblies 12 and 13 support a turbine section 20, a compound planetary gear train 40, and an overrunning clutch 60.

If 100 to 300 ccs of oil is displaced to the turbine exhaust air without detection by the pilot or ground crew, loss of the air turbine starter by turbine bearing failure is possible.The coke build-up destroys the flatness of the sealing contact surfaces between the rotor and the seal carbon ring.The coke separates the two surfaces resulting in a clearance therebetween.Typically, the air pressure at the inlet 16 is in the range of 30-40 psig.Within the air turbine starter 10, the housing assemblies 12 and 13 support a turbine section 20, a compound planetary gear train 40, and an overrunning clutch 60.The housing assembly 13 includes a mounting flange 19 for mounting the air turbine starter to an aircraft engine (not shown).