MIL-DTL-197L
transferred to the unit packaging area in a continuous process. Delays shall be minimized.
Bearings waiting to be preserved or lubricated shall be kept in covered containers, suitable rust
preservatives, or humidity chambers to avoid corrosion. Bearings shall be reprocessed if they
become contaminated. Preserved bearings shall immediately be transferred (after insertion of
seals or shields) to the unit packaging area in clean, dust-excluding, compatible containers. The
unit packaging area, or secondary bagging, shall be well illuminated, clean, dry, and in an air-
conditioned environment. The presence of dust and dirt-producing sources shall be kept to a
minimum.
3.6.3 Cleaning. Open, non-lubricated 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 shall be used. Spray washes and ultrasonic
cleaning are permitted. Prior to lubrication and wrapping, bearings shall be thoroughly cleaned
and shall be free of any chemical or particulate residue that will have a detrimental effect on the
life of the bearing. The cleaning system shall be capable of cleaning bearings to the
requirements of 4.5.4. 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.
3.6.4 Method 40B preservation area environment, cleaning and drying areas, and process
controls. Working area environment and process controls for method 40B bearings shall
3.7 Bearings, plain, rod end, self-aligning, self-lubricating, SAE AS81935; bearings,
sleeve, plain and flanged, self-lubricating, SAE AS81934; bearings, plain, self-aligning, self-
lubricating, low speed oscillation, SAE AS81820; and similar airframe products.
3.7.1 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. The area for the self-lubricating plain bearings shall be maintained
at a temperature of 75 ±10 °F (24 ±6 °C) with a maximum R.H. of 75 percent. The enclosed
atmosphere shall be well ventilated and maintained so that the particle count is 2500 maximum,
with a particle size of 5 µm or less, when measured in accordance with ASTM F25/F25M or
ASTM F50.
3.7.2 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. Bearings shall be preserved and transferred to
the unit packaging area in a continuous process (see 3.10.1). Delays shall be minimized.
Bearings shall be reprocessed if they become contaminated. 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.
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