In this chapter under auxilary materials media are understood, which can not related to a continuous delivering system. To these belong primarily lubrication greases (chapter 22.4-1), sealing compounds (chapter 22.4.2) as well as cleaning agents and solvents (chapter 22.4.3 and chapter 19.2.3).
Auxilary materials play a considerable role for the function of an aeroengine. Usually they are tested and approved by the OEM. In the instructions like MIL spezifications (Lit. 22.4-1), the limits of application and properties are defined. However ,these give the producer definitely ranges for its prodcuct. That makes it possible, that with a product change surprisingly undesirably effects occur.

The testing and approval of auxilary materials must consider many influences. To these belong:

• Processibility/handling, removal, disposal/dumping (Fig. "Disposal of washing medium") and toxicity.
• Possible deteriorating effects at different materials with which the medium can get in contact.
• Operation influences like time, temperature, humidity/moisture, corrosion, other auxilary materials (e.g., solvents) on the function and aging of the auxilary material.
• Availability.

Confusions or unauthorised application can lead to considerably failures/damages and safety risks. Dangerously are also application specific media, wich are not scheduled from the OEM and instructions respectively manuals. To these belong especially lubrication greases for boltings (screws, nuts, Fig. "Bolt prestress decrease during service").

References

22.4-1 “Military Specification Lubrication Products”, www.mtpinc-exporter.com, page 1-8. (4512/

22.4-2 “Military Specifications & Other Approvals”, www.fsptbm.com, page1 and 2.

22.4-3 NTSB Aircraft Accident Report AAR-02/01,PB2002-910402 Notation 7263E, “Loss of Control and Impact with Pacific Ocean - Alaska Airlines Flight 261, January 31, 2000”, Bericht 30. December 2002, page 1-189.

22.4-4 T.Harless, W.Stelk, “Helicopter Engines and Desert Environments - Who Wins?”, Naval Safety Center, Mech Magazine, Mech Summer 2005, www.safetycenter.navy.mil, page1 and 2.

22.4-5 “Besser als Vaseline - Schmier - und Montagepasten”, Zeitschrift „Konstruktionspraxis“ Nr 8-August 1997, 8.Jg., page 84.

22.4-6 “Premium military approved greases for the aviation industry”, www.shell-lubricants.com, SOC: 140-09/04, page 1-4.

22.4-7 “Angaben zu Spezifikationen von US, NATO, UK, FR, NSN”, www.silco-tec.com.com, SOC: 140-09/04, page 1-4.

22.4-8 “Mil-Spec Chemicals: Lubricants”, www.chemsol.com, 02.03.2006, page 1-6.

22.4-9 “Greases and Anti-Seizure/Lubricant Compounds Selection Guide”, Fa. Acheson, 2006, page 1.

22.4-10 “Lubricants & Lubricating Compounds”, www.zipchem.com, 2006, page 1-3.

22.4-11 “Military Lubricants & Oils”, www.globaltradelink.com, 2006, page 1-3.

22.4-12 “Anti-Seize Compounds”, www.jetlube.com, 2006, page 1-7.

22.4-13 NTSB Identification DCA89MA034, microfiche Number 41269A, “Continental Airlines Inc., Accident occurred Mar-17-89 at Oakland,CA”, page 1.

22.4-14 D.A.Lombardo, „Controlling Foreign Object Damage”, Zeitschrift „Aviation Maintenance (AM)“ , April 1977, page 27-31.

22.4-15 S.Broderick, “FAA to Warn Against Mixing Greases”, Zeitschrift „Overhaul & Maintenance”, May 2001, page 35 and 36.

22.4-16 R.L.McAlpin, P.L.Talley, H.L.Bernstein, R.E.Holm, , “Failure Analysis of Inlet Guide Vanes”, Paper 2001-GT-0428, ASME Turbo Expo 2001, June 4-7, 2001, New Orleans, Louisiana, page 1-5.

22.4-17 R.Martin, R.Campion, “Aging of Composites”, Zeitschrift „Materials World“, Vol.4 no. 4 pp. 200-02, April 1996, www.azom.com, page 1-6.

22.4-18 Australian Transport Safety Bureau, Technical Analysis Report 17/03, “Bolt Fracture, High Pressure Turbine Disk Assembly”, Dr. A.Romeyn, Pratt & Whitney Canada PW 118A, 24-3-2004, page 1-20.

22.4-19 M.Johnson, “Solid Film Lubricants: A Practical Guide”, Zeitschrift „Machinery Lubrication Magazine”, March 2006, 4 pages .

22.4-20 “Solid Lubricants”, www.tribology-abc.com, 2007, page 1-4.

22.4-21 “Solid and Dry Film Lubricants Specifications”, www.GlobalSpec.com, 2007, page1-3.

22.4-22 “Fuel storage system contaminated”, Ref. 510003474, Flight Safety Australia November-December 2006,“Selected Service Difficulty Reports ”, page 52.