Aircraft Maintenance Technology

NOV-DEC 2018

The aircraft maintenance professional's source for technological advancements, maintenance alerts, news, articles, events, and careers

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TECH TIPS 12 NOVEMBER/DECEMBER 2018 AIRCRAFT MAINTENANCE TECHNOLOGY o better understand the aviation industry's key con- cerns and pain points related to grease, ExxonMobil asked MRO Americas attendees to submit their grease-related questions directly to the ExxonMobil team. Having collected more than 40 questions on grease, including color, formulation, compatibility, storage, and handling, ExxonMobil has offered to share the answers in a three-part article series. In the final part of the grease series, Gary Dudley tackles questions on evaluating grease color and odor and how this may or may not indicate the status of grease condition. Q. What causes grease to produce an odor? Does grease odor impact performance? While many base oils and additives used in greases have a defined odor when fresh, odors can also be the result of in-service degradation of the grease. However, ExxonMobil aviation greases formulated from 100 percent polyalpha- olefin (PAO) base oil, such as Mobilgrease 33, will minimize these objectionable odors. Greases containing an ester base stock may be susceptible to hydrolysis and could generate an odor as they degrade in-service. EXXONMOBIL Gary Dudley, Ph.D., Global Grease Product Technical Advisor for ExxonMobil Research & Engineering Lubricants Technology, tackles questions on evaluating grease color and odor and how this may or may not indicate the status of grease condition By Gary Dudley

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