MIL-PRF-81757/2C
3.10.6 Visual and mechanical. Add after the first sentence: "The vented filler cap shall also
be in accordance with all the requirements of 3.7.12."
4.2.2 Inspection of cells, components, and materials. In the third sentence, change "Three"
to "Twenty".
4.3.1 Inspection of product. In the first sentence, change "groups B and C" to "group C"
(two places). In the second sentence, change "groups A, B, and C inspection" to "groups A and
C inspection".
4.3.3 Sample size and selection for groups A, B, and C inspection. Delete the title and text
and substitute: "Sample size and selection for groups A and C inspection. Each unit shall
undergo group A inspection. The sample size for group C inspection is shown in table V."
4.3.5 Group B inspection. Delete the paragraph.
4.5.3 Electrolyte soak of components and elastomeric materials. Delete the entire text and
substitute: "Force an aqueous solution of potassium hydroxide of 1.30 ± 0.04 specific gravity
through the internal parts of the vented filler cap, including the check valve mechanism. Within
0.50 ± 0.25 hours after this, immerse the entire vented filler cap in an aqueous solution of
potassium hydroxide of 1.30 ± 0.04 specific gravity in a temperature chamber at 65.5° ± 1.1°C
(150° ± 2°F) for 168 ± 2 hours. Rinse with water and wipe dry. Examine the vented filler cap for
the requirements of 3.10.3. Subject the vented filler cap to 4.5.6, 4.5.5.1, 4.5.5.4, and 4.5.5.5.
Examine the vented filler cap for the requirements of 3.7.12, 3.8.6, 3.10.5, and 3.10.6."
3.3 Add the following paragraphs:
"4.5.5.4 Check valve seal. Slowly raise the differential pressure to 12.0 psi to the check
valve over a period of not less than 1 minute. Examine the seal for bubbles or leaks. Examine the
vented filler cap for the requirements of 3.7.12.3."
"4.5.5.5 O-ring seal. Remove the check valve from a vented filler cap. Attach the vented
filler cap to a cell. Apply a 15 psig internal cell pressure differential to the top of the vented filler
cap and immerse the cell in water. Examine the seal for bubbles or leaks. Examine the vented
filler cap for the requirements of 3.7.12.4."
3.4 Modify the following paragraphs and tables:
4.5.6 Visual and mechanical examination. Add a new second sentence: "Examine each
vented filler cap to determine whether any flash and sprue molding remnants exist, all components
are correctly positioned, and the color conforms to tables I and II of the specification sheet."
5
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business