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

shown not to thermally shock the units; however a different rate of temperature change

may be used at the tester's discretion.

6.7 Subject term (key word) listing.

Howitzer

M777

M198

Towed Artillery

6.8 Changes from previous issue. Marginal notations are not used in this revision to

identify changes with respect to the previous issue due to the extent of the changes.

Custodian:

Preparing activity:

Army-AR

Navy-OS

(1240-2012-002)

Air Force-84

Review activities:

Army-AV, MI

Navy-MC

Air Force-99

DLA-CC

Civil agency:

GSA-FAS

NOTE: The activities listed above were interested in this document as of the date of this

document. Since organizations and responsibilities can change, you should verify the

currency of the information above using the ASSIST Online database at