ENGINES


Examples of damage to an armature caused by the “China Syndrome”


Put that Hammer Down! “Ask an old-timer what the trick he uses when a DC motor doesn’t work, and he might say, ‘Get a hammer,’” Briggs tells Helicopter Maintenance magazine. “They might think that hitting the motor with a hammer will jiggle the brushes or the dead spot on the commutator. That is NEVER a good idea with a fuel pump. Although the housing on the bottom of the pumps looks thick, it’s not, and I have seem some of these come in caved in and cracked!”


“You’re going to end up pushing the armature up against the side of the bearing housing,” adds Lotzer. “It’s not going to work. Don’t beat on them!” If you don’t bang on them with hammers, keep your fuel system FOD- and water-free, inspect for any external corrosion and treat it, and prevent operating them in self- destructive “China Syndrome” scenarios, you will go a long way to help ensure you get the most from your fuel pumps!


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© 2014 SkyBOOKS Inc. All registered trademarks are the property of SkyBOOKS Inc. February | March 2014 HelicopterMaintenanceMagazine.com 29


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