TM 9-1290-333-15 - Liberated Manuals.com

1 TM 9-1290-333-15 DEPARTMENT OF THE ARMY TECHNICAL MANUALOPERATOR, ORGANIZATIONAL, FIELDAND DEPOT maintenance MANUALCOMPASS, MAGNETIC,UNMOUNTED: M2 This copy IS a reprint which includes currentpages from Changes 1 through , DEPARTMENT OF THE ARMY7 NOVEMBER 1963 CHANGENo. 4TM 9-1290-333-15C4 HEADQUARTERSDEPARTMENT OF THE ARMYW ashington, DC, 11 September 1985 OPERATOR, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORTAND DEPOT maintenance MANUAL(Including Repair Parts and Special Tools List)COMPASS, MAGNETIC, UNMOUNTED: M2 (1290-930-4260)TM 9-1290-333-15 , 7 November 1963, is changed as follows:Page 6, para 11c. When closing the M2 Compass,make sure that the rear sight is folded into the planeof the rearsight holder. If the rear sight is not inthis position during closing, mirror damage 7, Table I, Point of Inspection: (MagneticNeedle).

2 Figure number 5 is 7, Table I, Accepted Standards: (MagneticNeedle). Paragraph is superseded as follows: Placethe compass on a level non-metalic surface, with thecover open. Once the magnetic needle has stabilized,note the position of the magnetic needle with re-spect to the azimuth scale. With a piece of metal,pull the needle off a minimum of 100 mils. Theneedle should stabilize at the same reading as before 10 mils. Watch for any sudden stoppage ofmagnetic needle during this 7, Table I, under Point of Inspection. AddNeedle Lifting (Locking) 7, Table I, Accepted Standards: (NeedleLifting (Locking) Pin). Add, Press the NeedleLifting (Locking) Pin down until its end is flushwith the compass body. Note, whether or not themagnetic needle is lifted offthe pivot point andis pressed flush against the glass face of 13, Table II, Malfunction.

3 Needle liftinglever fails to lock, is changed to read Needlelifting lever fails to lift. Page 13, Table II, Malfunction. Add, Cannot readazimuth scale or see sight picture through 13, Table II, probable Cause. Add, Mirrorcracked, broken or 13, Table II, Corrective Action. Add, Obtainnew 13, para 28b is superseded as follows: b. Turnin unserviceable compasses through direct supportunit for property 18, Column (2). Federal Stock No. 1290-560-6596 is superseded by NSN 1290-00-930-4260. Page 18, Column (3). Part Number (8293421) issuperseded by (10547166)".Page 18, Column (2). Federal Stock No. 1290-654-5048 is superseded by NSN 6605-00-946-8757. By Order of the Secretary of the Army:Official:JOHN A. WICKHAM, , United States ArmyChief of StaffDONALD J. DELANDROB rigadier General. United States Army The Adjutant GeneralDistribution:To be distributed in accordance with DA Form 12-41, Operator,Organizational, Direct and General Support maintenance requirementsfor Compass, Magnetic, M2.

4 *TM 9-1290-333-15 DEPARTMENT OF THE ARMY TECHNICAL MANUALOPERATOR, ORGANIZATIONAL, FIELD AND DEPOTMAINTENANCE MANUAL(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)FORCOMPASS, MAGNETIC, UNMOUNTED: M2 Headquarters, Department of the Amy, Washington 25, November .. maintenance allocation..Forms, records, and reports ..Description and dataDescription..Characteristic ..Equipment issued with compass M2..OPERATING INSTRUCTIONSG eneral..Duties..Services..Operation under usual conditionsGeneral ..Care in handling..Preparation for use..Operation..Operation under unusual conditionsGeneral..Operation in extreme cold..Operation under dusty or sandy conditions.. maintenance INSTRUCTIONSR epair parts, tools and equipment for operation and organizationalmaintenanceRepair parts..Common or special tools..Equipment ..Preventive- maintenance servicesGeneral.

5 Responsibility..General procedures for all services and inspections ..Preventive maintanance by operator (s)..Specific procedures for first echelon..1234567891011121314151617181920 21222324 Page333455666666699101111111111111212*Th is manual supersedes SB 9-208, 28 June 1962; TM 9-6605200-12P, 6 March 1959; and that portion of TM 9-575,20 October 1948, and TM 9-1530, 21 March 1950, pertaining to Compass ..Procedure..Repair of compass M2 and carrying case M19 General .. maintenance ..Final inspection..DOMESTIC SHIPMENT, LIMITED STORAGE, AND DEMOLITIONTO PREVENT ENEMY USED omestic shipment and limited storageShipping instructions ..Proceeding and packaging ..Demolition of materiel to prevent enemy useGeneral ..Destruction by disposal..REFERENCESBASIC ISSUE ITEMS, ORGANIZATIONAL, FIELD AND DEPOTREPAIR PARTS AND SPECIAL TOOLS LISTSMAINTENANCE ALLOCATION CHARTP aragraph252627282930313233 Page1313131313141414141517192 CHAPTER 1 INTRODUCTIONS ection I.

6 GENERAL1. Scopea. This manual contains instructions foroperation, organizational, field, and depotmaintenance of compass, magnetic, un-mounted: Appendix I contains a list of currentreferences, including supply and technicalmanuals, forms, and other available pub-lications applicable to compass Appendix II contains a basic issueitem list required for stockage by firstechelon maintenance and includes thosecomponents, with quantities thereof, con-stituting the major item. It also lists firstechelon equipment and spare parts all ofwhich constitute the major end item forissue to users. The list also includesmaintenance parts and equipment, withquantities thereof, required for organiza-tional, field and depot maintenance of themajor end item and its Appendix III contains a maintenanceallocation chart which lists maintenanceresponsibilities allocated to each echelonof This first edition is being publishedin advance of complete technical direct reporting of errors, omissions,and recommendations for improving thisequipment -manual by the individual useris authorized and encouraged.

7 DA Form2028 will be used for reporting these im-provements. This form may be completedusing pencil, pen or typewriter. DA Forms2028 will be completed in triplicate andforwarded by the individual using the man-ual. The original and one copy will beforwarded direct to the Commanding Offi-cer, Frankford Arsenal, ATTN: SMUFA-3100, Philadelphia, Pennsylvania information copy will be provided tothe individuals immediate maintenance AllocationThe maintenance of compass M2 doesnot require the use of tools and will beperformed as reflected in the maintenanceallocation chart (app. III).3. Form, Records, and Reportsa. General. Responsibility for theproper execution of forms, records, andreports rests upon the commanding offi-cers of all units maintaining this equip-ment.

8 However, the value of accuraterecords must be fully appreciated by allpersons responsible for their compilation, maintenance , and use. Records, reports,and authorized forms are normally utilizedto indicate the type, quantity, and condi-tion of materiel to be inspected or re-placed. Properly executed forms conveyauthorization and serve as records forreplacement of materiel in the hands Authorized Forms. The forms gen-erally applicable to units operating ormaintaining this materiel are listed inappendix I. For instructions on the use ofthese forms refer to TM 38-750, FM 9-3and FM 9-4, For a listing of all forms,refer to DA Pam Field Reports of Accidents. The re-ports necessary to comp1y with. therequirements of the Army safety programare prescribed in detail in AR.

9 Reports are required whenever ac-cidents involving injury to personnel ordamage to materiel Equipment Improvements Recom-mendations. Deficiencies detected in theequipment or materials should be reportedusing the Equipment Improvement Recom-mendation section of DA Form II. DESCRIPTION AND DATA4. Descriptiona. General. Unmounted magnetic com-pass M2 (figs. 1 and 2) is a multiple pur-pose instrument applicable to obtainingclinometer, angle of site, and azimuthreadings. The body of the compass isdustproof and moisture proof, and is madeof nonmagnetic material except for themagnetic needle and its pivot. When thecover is closed, the magnetic needle isautomatically lifted from its pivot to pro-tect the pivot point and jewel jewel bearing is agate.

10 The compassis provided with an angle of site scale andan azimuth scale. The azimuth scale maybe rotated approximately 1,800 mils. Thecompass is equipped with circular andtubular levels. In place of a telescope,the compass employs front and rear leafsights in conjunction with a mirror in thecover for sighting and reading the instrument has an azimuth scale ad-juster for orienting the azimuth scale tothe local magnetic declination, so thatgrid or Y azimuths may be read Angle of Sight Mechanism and Re-lated Parts. Rotation of the level lever(fig. 6) causes tie elevation level andelevation scale index to rotate as a index clamps against the bottom pieceto prevent the mechanism from movingunless actuated by the level Magnetic Needle and Lifting magnetic needle provides amagnetic north direction for orienting pur-poses.