MIL-DTL-197L
3.7.3 Cleaning. The bearings shall be cleaned by any process or combination of
processes that will accomplish thorough cleaning without damage to the item. The self-
lubricating bearings shall be cleaned using established cleaning procedures. The use of filtered,
dry, compressed air or wiping with soft, clean cloth are examples of suitable processes.
Cleaning solvents, greases, or oils shall not be used. Prior to wrapping, bearings shall be
thoroughly dry and free of any chemical or particulate residue that could have a detrimental
affect on the bearing. Written procedures shall be established for planned maintenance and
checks of the cleaning and drying systems and the frequency of such maintenance actions and
checks.
3.8 Bearings, plain, self-aligning, all metal, SAE AS8976; bearings, plain, self-aligning,
(Cu-Be ball, CRES race), SAE AS81936; and similar airframe products.
3.8.1 Environment and process cleanliness of cleaning and drying areas. The presence
of dust and dirt-producing sources, such as cartons or trash barrels, shall be kept to a minimum.
Smoking, eating, and drinking shall not be permitted in the cleaning and drying areas. Cleaning
and drying areas are defined as those areas within a 10-foot radius of the cleaning and drying
equipment, including aisles.
3.8.2 Preservation and unit packaging area environment and process control. The
working area shall be well illuminated. The temperature shall be maintained at 75 ±10 °F
(24 ±6 °C) with a maximum R.H. of 75 percent. Area control shall be in accordance with 3.8.1.
Bearings shall be preserved and transferred to the unit packaging area in a continuous process
(see 3.10.1). Delays shall be minimized. Bearings waiting to be preserved or greased shall be
kept covered as necessary to avoid contamination. Bearings shall be reprocessed if they become
contaminated. Preserved bearings shall be transferred to the unit packaging area. The unit
packaging area shall be well illuminated, clean, and dry. The presence of dust and dirt-
producing sources shall be kept to a minimum.
3.8.3 Cleaning. The bearings shall be cleaned by any process or combination of
processes that will accomplish thorough cleaning without damage to the item. Agitation tanks
and commercial filtration systems may be used. Spray washes and ultrasonic cleaning are
permitted. Prior to wrapping, bearings shall be thoroughly cleaned and shall be free of any
chemical or particulate residue that could have a detrimental effect on the life of the bearing.
Written procedures shall be established for planned maintenance and checks of the cleaning and
drying systems. At a minimum, the procedures shall include machinery cleanliness, filter
maintenance, cleaning fluid quality and cleanliness, and the frequency of such maintenance
actions and checks.
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