MIL-DTL-48559 Mount, Telescope And Quadrant - M172A1This specification covers the Mount, Telescope and Quadrant: M172A1 which supports the Fire Control Quadrant: M18A1 for use on the M777 and M198 series of howitzers and gives elevation compensation to correct for cant when the mount is leveled by a cross level movement. The mount also supports and aligns the mounting bracket for the Elbow Telescope: M138A1.

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MIL-DTL-48559B

4.9 Interchangeability.

4.9.1 Interchangeability of mounting surface for M18A1 quadrant. Insert, seat,

secure, and subsequently remove the maximum interchangeability gage, 11747844, on the

mounting surface for the M18A1 quadrant on the M172A1 to verify conformance to 3.9.1.

4.9.2 Interchangeability of mounting surface for M172A1 mount. Insert, seat,

secure, and subsequently remove the maximum interchangeability gage, 11747840, on the

mounting surface for the M172A1 mount to verify conformance to 3.9.2.

4.9.3 Interchangeability of mounting surface for M138A1 telescope. Insert, seat,

secure, and subsequently remove the maximum interchangeability gage, 11747978, on the

mounting surface for the M138A1 telescope on the M172A1 to verify conformance to

3.9.3.

4.10 Workmanship. Workmanship of the M172A1 mount shall be verified in

accordance with MIL-F-13926.

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as

specified in the contract or order (see 6.2). When packaging of materiel is to be performed

by DoD or in-house contractor personnel, these personnel need to contact the responsible

packaging activity to ascertain packaging requirements. Packaging requirements are

maintained by the Inventory Control Point's packaging activities within the Military

Service or Defense Agency, or within the military service's system commands. Packaging

data retrieval is available from the managing Military Department's or Defense Agency's

automated packaging files, CD-ROM products, or by contacting the responsible packaging

activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be

helpful, but is not mandatory.)

6.1 Intended use. The Mount, Telescope, and Quadrant: M172A1 is used to support

and employ a fire control quadrant for laying the artillery weapon in elevation for indirect

fire and direct fire. It also supports an elbow telescope intended for laying the artillery

weapon in elevation for direct fire.

6.2 Acquisition requirements. Acquisition documents should specify the following:

a. Title, number and date of this specification.