Downloaded from https://www.everyspec.com ADS-79D-HDBK FIGURE D-12. Damaged ball from 01-05270 aft hanger bearing Figure D-13 shows a comparative histogram for the AH-64D Survey FPG101 Aft Hanger Bearing Energy CI. The fleet data is a statistically representative sample of 6379 points and includes data from all other monitored tail numbers. The current yellow limit, 7 g, effectively separates this bearing from the rest of the fleet, and it is the only case from the fleet that has ever produced an Aft Hanger Bearing Energy CI value over the red threshold, 14 g. FIGURE D-13.
AH-64D aft hanger bearing energy Figures D-14, D-15, and D-16 show comparative histograms of the same CI from an Apache Tail Drive Train Test Stand seeded fault test. This CI effectively detected saltwater-corroded bearings and coarse sand contamination in the bearing grease, and the current yellow threshold, 7 g, provides excellent separation. The CI provided limited detection of fine sand grease contamination, and very few values were above the yellow threshold. 97