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TM-9-1240-311-34 Telescope Articulated: M127 (1240-437-1254) and M127A1 (M127E1) (1240-148-8539) and Hanger Assembly (1240-906-79451) Manual
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Figure 1-1. Articulated telescope M127 and M127A1 (M127E1) with hanger assembly--assembled view
TM 9-1240-311-34
CHAPTER 1
INTRODUCTION
Section I. GENERAL
forms, records, and reports which are to be used by
1-1.
Scope
maintenance personnel at all maintenance levels are
a. This publication contains instructions for repair of
listed and prescribed by TM 38-750.
articulated telescope M127, M127A1 (M127E1) and
associated equipment, by direct support (DS) and
b.  Reporting of Errors.   The reporting of errors,
general support (GS) maintenance shops.
omissions, and recommendations for improving this
b. Instructions  for  operation,  lubrication,  and
publication by the individual user is encouraged.
preventative maintenance of this instrument at the
Reports should be submitted on DA  Form  2028
operator and organizational levels are contained in TM 9-
(Recommended Changes to Publications) and forwarded
2350-230-12.
directly to the Commanding Officer, Frankford Arsenal,
ATTN: SARFA-W3100, Philadelphia.
1-2.
Forms and Reports
PA 19137.
a.  Maintenance Forms and Records.
Maintenance
Section II. DESCRIPTION AND DATA
means of optical projection. Selection of reticles is made
1-3.
Description (Fig. 1-1)
by actuating a switch (gunner's control panel) to
illuminate either reticle pattern.
a. Articulated  telescope  M127  and  M127A1
(M127E1) (fig. 1-1) are hermetically sealed, dual power,
1-4.
Data
instrument used for direct fire control of the conventional
a. General.
(152MM) round and part of the guidance and control
Length ............................................... 41-1/4 in.
group for the Shillelagh missile, the main armament
Weight ............................................... 33 lbs
system of the armored reconnaissance airborne assault
Electrical power source ..................... 24-28 VDC
vehicle, M551. The telescope is supported in the vehicle
by telescope mount M149, and hanger assembly (8)
b. Operating Limits.
described in Chapter 4. The articulated joints (4 and 10)
permits the gunner to view the target through the full
Elevation ........................................... 20 degrees
range of gun elevation and depression.
Depression ........................................ 10 degrees
b. The filter selector lever (3) is used to select one
of two filters, or a clear glass plate, as required. The
c. Characteristics.
dual power unit (6) contains an optical assembly which is
Magnification ..................................... 3 or 12 power
placed into the field-of-view by means of a selector lever
.......................................................... 8 power -8.0
to increase magnification of the telescope from 8 to 12
degrees
power. A diopter adjustment knob (9) permits focusing
Field-of-view ...................................... 12 power -5.338
of the telescope to the eye of the observer. Parallax is
.......................................................... degrees
corrected by rotating the parallax adjustment (a slotted
Clear eye distance ............................ 1.31 in.
screw (5)) on top of the filter housing at the articulated
Diameter of exit pupil ........................ 8 power -7MM
joint. The reticle projector assembly (11) is separately
12 power -4.7MM
housed on the underside of the telescope in front of the
Effective focal length of objective...... 12.00 in.
Diopter range .................................... 4 diopters
articulated joint.  The assembly induces two reticle
patterns, one for the guided missile the other for the
conventional round. separately into the field-of-view by
Change 1 1-1

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