CHAPTER 1 INTRODUCTION - TM-9-1240-311-340004

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