MIL-DTL-23618H(AS)
a. In maintenance manuals, when the entire paragraph, including all subparagraphs, is
considered hardness critical, only major paragraph shall be marked. The symbol [HCP]
shall be placed between paragraph number and title.
b. When only certain processes/steps within a paragraph are hardness critical, only the
applicable process/step will be marked. The symbol [HCP] shall be placed between the
step number and title.
c. In the Illustrated Parts Breakdown (IPB), when survivability considerations are specified
and Hardness Critical Items [HCI] are identified on drawings and parts lists, they must
also be marked and identified in the description column of the GAPL. It is preferred that
the symbol [HCI] be placed within brackets [HCI]; however, other methods of
highlighting the symbol to call attention to its importance are acceptable.
d. The introduction shall include a listing and explanation of the symbols [HCP]/[HCI]
respectively and other pertinent information as necessary to emphasize the specialness of
hardness features. This shall include an explanation statement that the symbols establish
the requirement that all paragraphs and processes/steps in the maintenance manual and the
items in the IPB identified by the symbols must be followed as written to ensure nuclear
hardness is not degraded. This statement shall be preceded by a caution.
3.1.5.7 Electrostatic discharge [ESD] sensitive parts. If electronic equipment to be handled,
inspected, repaired, or assembled is ESD sensitive, the items shall be marked and identified with
the symbol [ESD] as follows:
a. In maintenance manuals, when an entire paragraph, including all subparagraphs, is
considered ESD sensitive, only the major paragraph shall be marked. The symbol [ESD]
shall be placed between paragraph number and title.
b. When only certain processes/steps within a paragraph are ESD sensitive, only the
applicable process/step shall be marked. The symbol [ESD] shall be placed between the
step number and title.
c. In the IPB, ESD sensitive items shall be identified in the description column of the GAPL.
It is preferred that the symbol [ESD] be placed within brackets [ESD]; however, other
methods of highlighting the symbol to call attention to its importance are acceptable.
d. The introduction shall include a listing and explanation of the symbol [ESD] and other
pertinent information as necessary to emphasize the uniqueness of ESD components.
(1) This will include an explanation statement that the symbols establish the requirement
that all paragraphs and processes/steps in the maintenance manual and the items in the
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