Avbook intro/notes a/w sect
AEROSHELL GREASE 33
AeroShell Grease 33 is a synthetic universal airframe grease composed of
Use of AeroShell Grease 33 can provide operators with the following
a lithium complex thickened synthetic base oil with corrosion and oxidation
inhibitors and load carrying additives.
The useful operating temperature range is –73°C to +121°C.
• Easier maintainability (one major grease for most applications)• Reduced maintenance labour costs
• Less chance of product mis-application
For many years aircraft operators have been seeking to rationalise the
AeroShell Grease 33 contains a synthetic oil and must not be used with
greases used on aircraft and to reduce the number of different greases in
incompatible seal materials. Refer to the General Notes at the front of this
their inventories. Recently Boeing began research on a new, general
purpose, corrosion-inhibiting grease. The aim was for a non-clay basedgrease that would provide longer life for components and mechanisms and
possess improved wear and corrosion resistance. This led to the
introduction of the new Boeing Specification BMS 3-33.
Owing to the wide range of operating temperatures, loads and other
environmental conditions required for various aircraft components, severaldifferent types of grease with different desirable properties are used during
routine lubrication of aircraft components. Boeing, in developing their BMS3-33 specification, took account of the properties of the different grease
types used on aircraft and wrote a specification for a grease which wouldprovide improved performance and which could be used in the widest
possible range of grease applications.
AeroShell Grease 33 is approved to BMS 3-33A and offers the improvedperformance properties required by this specification.
Joint Service Designation
AeroShell Grease 33 can be used for routine lubrication on Boeing aircraftwhere MIL-PRF-23827C or BMS 3-24 is specified. AeroShell Grease 33
can also be used in some applications on Boeing aircraft which require useof MIL-G-21164. Other applications on Boeing aircraft which require use ofMIL-G-21164 and other greases are being reviewed and in due courseBoeing will issue details of the full range of applications. For the currentstatus, refer to the latest issue of Boeing Service Letter "BMS 3-33 GeneralPurpose Aircraft Grease".
AeroShell Grease 33 can be used for routine lubrication in applicationswhere MIL-PRF-23827C is specified on aircraft manufactured by McDonnellDouglas, Airbus, BAe Regional Aircraft, Canadair, Lockheed, Embraer,Fokker and Gulfstream (except for wheel bearings, applications above121°C and sliding applications requiring molybdenum disulphide).
Other aircraft manufacturers are evaluating AeroShell Grease 33 with theaim of approving it for use on their aircraft. Operators should regularlycheck with these manufacturers for the latest status.
William Vlach Assistant Lab/PSD Manager ADM Cocoa 12500 W. Carmen Ave. Milwaukee, WI 53225-6199 PH: 414-358-5886 William_vlach@admworld.com Bill graduated from Concordia University with a B.A. in Science. He has been a presenter for ten years at in-house seminars held by ADM Cocoa and has attended workshops and seminars including Penn State Chocolate Manufacturer
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