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![]() ARMY
TM 9-6650-235-13&P
MARINE CORPS
TM-08552A-13&P
c. Borescope Extension Tubes I, II, and III. Three
borescope extension tubes are provided, each consisting
of a forward (1) and a rear (2) section. They permit
inspection of the longest weapons encountered. The
borescope extension tubes are numbered with Roman
numerals (I, II, and III). These tubes have a lock
assembly on one end and a hole on the other end to
receive the key on the lock assembly of the next tube
section. The forward sections of the extension tubes are
identical (as are the rear sections) except for the
graduations on the outside of the tubes. The tubes have
graduation marks of 1.0 inch, 6.0 inch and 1.0 foot
intervals (up to 26 feet) with the 6.0 inch and 1.0 foot
marks completely encircling the tube. A line runs within
4.0 inches of the length of the tube through the center of
the graduation intervals to assist in the assembly of the
sections and to provide a reference point for stating the
o'clock position of cannon bore defects. The specific
order of assembly between the objective tube assembly
and adapter tube assembly is borescope extension tubes
I, II, and III.
BORESCOPE EXTENSION TUBES I, II, & III
1-3
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