MIL-DTL-82909A (OS)
2.4 Order of precedence. In the event of a conflict between the text of this document and the references
cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes
applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 First article. When specified in the contract or purchase order (see 6.2), a sample shall be subjected to
the first article inspection (see 4.2.1 and 6.3).
3.2 Flight critical part. The battery pack is a flight critical item and the technical data package shall be
identified and procured as such.
3.3 Design and construction. The following applies to the qualification status and configuration control
of the battery pack over the entire life of the item.
3.3.1 Identical configuration. The battery pack design and construction shall be identical to that
subjected to qualification testing and approved for service use by the Navy. The battery pack operational
life shall be 225 seconds, minimum, in the operational environment of -65 to 200°F.
3.3.2 Configuration control. Only the thermal battery procured from the vendor(s) listed on Drawing
MBEU147991 is approved for the application specified. A substitute thermal battery shall not be used
without prior testing and approval by the Indian Head Division, Naval Surface Warfare Center, Indian
Head, MD 20640-5035 and the Naval Air Systems Command Headquarters.
3.4 Primary components. The percussion primer and the thermal battery chemicals are primary
components. Only one lot of each primary component shall be used in a battery pack lot. One primary lot
may be used in more than one battery pack lot.
3.4.1 Percussion Primers. Only primers manufactured within the last 24 months or recertified within the
last 12 months shall be used in the thermal battery.
3.5 Battery pack production. The battery packs shall be manufactured in accordance with
MBEU147990 and the documents listed thereon. Each production battery pack shall meet the requirements
of 3.4 and 3.5.1 through 3.5.8 as outlined in table I. Failure of any battery pack to meet the requirements of
3.4 and table I shall result in rejection of that battery pack.
3.5.1 Visual inspection. Battery packs shall be free of the following defects: illegible, missing or
inaccurate identification markings, damage, burrs, dents, sharp edges, or other defects which may prevent
installation of the battery pack into its mounting bracket and/or gas or electrical connections. Each battery
pack shall meet the requirements of 3.4, 3.7, and Drawing MBEU147990.
3.5.2 Radiographic examination. When radiographically examined in accordance with 4.3.2, the battery
pack shall show proper assembly, presence of parts, sealing and proper electrical connections, proper
thread form, and presence of the battery chemicals. The radiographic inspection shall show no foreign
materials present.
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