Downloaded from https://www.everyspec.com ADS-79D-HDBK oil related problems. As a result of this and other successes, in-service oil analysis became firmly established as a reliable engine monitoring technique. The US Army instituted a similar oil analysis program for its aircraft in 1959. This program was followed by the addition of ground combat equipment in 1975 and remaining Army equipment in 1979.
In the 21 st century, the newest commercial and military aircraft utilize on- line wear debris sensors to provide diagnostic and prognostic capabilities such as the oil debris sensors on the F-35 JSF (F135 engine and STOVL LiftFan) and F-22 Raptor (F119 engine) military aircraft and the commercial geared turbofan PW1000G. The Army Oil Analysis Program (AOAP) was implemented to enhance safety, conserve resources, and to extend the life of major assemblies and components. AR750-1 states that oil analysis is mandatory for all Army aircraft unless the Deputy Chief of Staff (DCS), G–4 approves the exception per AR 750-1 Material Maintenance Policy.
For a list of equipment and components enrolled in the AOAP, the AOAP Web site: https://aoapserver.logsa.army.mil/aircraft_page_1.asp In the past two decades there have been significant improvements to oil testing equipment. Automation alone has provided improved test repeatability and reproducibility by reducing operator influence. For example, a series of wet chemistry tests have been replaced by a single automated Fourier Transform Infrared (FTIR) spectroscopy test. 67 The industry movement is towards performing oil and debris testing on-line, or at a minimum at-line, with hand-held oil condition testing and filter debris analysis.
68 Changes to component configuration and operation also impact oil analysis, such as: a. Advanced lubricant formulations to meet specific problems such as MIL-PRF- 23699F HTS for high thermal-oxidative stability and MIL-PRF-23699F C/I for improved corrosion inhibition. b. Improved design and metal manufacturing to reduce stress induced cracking. c. Finer filtration to remove wear debris that may cause secondary damage due to over- rolling. d. Longer duration missions. e. Operation in sandy conditions. f. Utilizing remediated/refurbished components. 67 Toms, A. M., J.R. Powell and J. Dixon. The Utilization of FT-IR for Army Oil Condition Monitoring , presented at and published in Proc.
JOAP International Condition Monitoring Conference, Humphrey, G. & R. Martin, ed., JOAP-TSC, Pensacola, FL (1998), pp. 170-176. 68 Garvey, R. ―Outstanding Return on Investment When Industrial Plant Lubrication Programs are Support by International Standards‖, JAI, Vol. 8, No. 6, JAI103526, 2011. 240