UNITED24 - Make a charitable donation in support of Ukraine!




Employment considerations require that field artillery TA assets be
deployed across the entire battlefield. For this reason, TA assets normally
are attached to another FA unit for administrative and logistical support.
This appendix outlines support requirements for field artillery TA assets.


The specific survey data required for each system are described below.

Weapons-Locating Radar

Required survey data for the AN/TPQ-36 are:

  • Grid zone.

  • Site location (universal transverse mercator [UTM] coordinates within 10 meters CEP).

  • Distance from near stake (radar location) to far stake (orienting point). This distance should be at least 250 meters. (Minimum distance is 100 meters).

  • Azimuth from near stake to far stake (0.4 mil PE).

  • Vertical angle from near stake to far stake (0.5 mil PE).

  • Altitude of the near stake (10 meters PE).

Weapons-Locating Radar

Survey data required for the AN/TPQ-37 are:

  • Grid zone.

  • Distance from near stake (radar location) to far stake (orienting point). This distance should be at least 250 meters. (Minimum distance is 100 meters).

  • Azimuth from near stake to far stake (0.4 mil PE).

  • Altitude of the near stake (3 meters PE).

AN/TPS-25A or AN/TPS-58B
Moving-Target-Locating Radar

Required survey data for the AN/TPS-25A or AN/TPS-58B are:

  • Site location (UTM coordinates within 10 meters CEP).

  • Azimuth from radar location to the orienting point (0.4 mil PE).

  • Distance from radar location to the orienting point (at least 450 meters for TPS-25A and 300 meters for TPS-58B).

  • Site location altitude (10 meters PE).


The supported unit must provide all communications data. These include signal operation instructions (SOI) and, for digital communications, an authentication matrix, a codebook and communications net materials. See Appendix E for further information on communications.

Radio Communication

The AN/TPQ-36 section normally operates on the DS battalion operations/fire net (VHF-FM)(D) and command net (VHF-FM)(V) as directed by the controlling headquarters. The AN/TPQ-37 and MTLR sections normally operate on the TA/intel net (VHF-FM)(D) and on the command net (VHF-FM)(V), as directed by the controlling headquarters. If a digital communications means is not available, the radar operator must use standard voice procedures over the command/fire net of the supported unit. These procedures are described in Appendix E of this manual and in FM 6-30, Chapter 4.

Wire Communications

Wire is the preferred means for both digital and voice communications. The unit to which the radar is attached is responsible for providing and installing the wire. However, in situations requiring frequent rapid moves or when the radar is located a distance from the headquarters, wire will probably not be used. Radio then becomes the primary means of communication.


When the radar section is attached to a unit, that unit is responsible for providing routine personnel and administrative support. The parent unit of the radar section will forward mail, pay, and routine distribution on a regular basis to the attached unit headquarters. The attached unit makes distribution to the radar section.


The unit to which the radar is attached supports the section with rations and water.


The supported unit is responsible for automotive and unit-level communications maintenance and turn-in of radios for repair or replacement, as required.


FA radar systems are maintained at four maintenance levels - unit, direct support, general support, and depot.

Unit-Level Maintenance

Unit maintenance consists of operator-performed scheduled preventive maintenance checks and services (PMCS) and unit-level scheduled and unscheduled maintenance as prescribed by the maintenance allocation chart. Each radar section should have on hand the prescribed essential repair parts stockage list (ERPSL) as authorized by the ERPSL manual for unit-level maintenance. These parts are mandatory and do not require demand support. The WLR mechanic (MOS 13R10X5) is responsible for performing all unit-level maintenance on WLRs. The target acquisition and surveillance radar repairer (MOS 39C10X5) is responsible for performing unit-level maintenance on the MTLRs. Both are also responsible for identifying equipment faults that require higher-level maintenance and for making sure the faulty equipment is job ordered to the support maintenance unit. The TA technician is trained to perform these supervisory tasks.

Direct Support Maintenance

The TA technician and unit mechanic request DS maintenance. The requests go through the controlling unit headquarters. The supported unit commander must be informed of all such requests to be sure that response of support is in keeping with the commander's TA priorities. Organization of an FA maintenance contact team will facilitate repair at the DS level. Positioning the contact team at div arty will reduce response time. The radar repairman (39C10X5) from the contact team performs selected tests and repairs and replaces components. He has a complete set of tools, test equipment, and repair parts at his disposal. If on-site repairs cannot be made, the radar will be moved to a rear location for major repairs. At DS level, the mean time to repair the radar is 2 hours. Maximum time for repair is 4 hours with two persons. The TAB and the CTAD each have a trained DS-level Firefinder repairman (MOS 39C10X5) and DS-level test, measurement, and diagnostic equipment (TMDE) to isolate DS-level faults to facilitate repairs to Firefinder radars as well as MTLRs. The TMDE will be located in one of the AN/TPQ-37 WLR sections.

General Support Maintenance

General support maintenance of Firefinder-peculiar items is either repair or replacement. Major components of a Firefinder radar that are not repairable by maintenance are replaced in heavy units on a one-for-one basis through Class VII resupply. In light units, the operational readiness float (ORF) can be issued for temporary use until the radar is repaired.

Depot Maintenance

The depot can completely overhaul and recondition major end items and assemblies that are beyond the capabilities of field maintenance units. The appointed depot for Firefinder and AN/TPS-58B radars is Sacramento Army Depot. For the AN/TPS-25A, it is Tobyhanna Army Depot.


The logistics concept for FA radar systems will not place any unusual demands on the supply system. The ERPSL governs the supply of Firefinder-peculiar items. Each support level has an ERPSL. Those quantities are demand-supported upward, but the minimum level prescribed must be maintained. The radar section deploys with essential repair parts for the radar. (See the ERPSL manual, TM 11-5840-363-24P.) The supported unit restocks common expendables as they are consumed. The parent unit forwards system-peculiar expendables to the section on an as-required basis.


The supported FA unit supplies Class III petroleum products to the radar section as part of its normal petroleum, oils, and lubricants (POL) distribution process.

NOTE: POL requirements for all FA radar systems
are shown in the table below.


Because of its small size, the FA radar section cannot provide its own security in a tactical situation. For this reason, the radar section should coordinate with adjacent units for mutual security. Similarly, when deployed, the radar section cannot perform other security or administrative functions, such as forming NBC or crater analysis teams, that are parent unit requirements when sections are not deployed.

Figure H-1. Radar System Requirements for Petroleum, Oils, and Lubricants

The deployed section falls under the responsibility of the supported unit for these functions.


Met data are crucial to the accuracy of hostile weapon location and friendly fire data. When using computer met messages, determine relative humidity from the TA met message. When using line 11 of the TA met message, obtain barometric pressure from line 03 of the computer met message. Required met data are:

  • Relative humidity.

  • Temperature.

  • Barometric pressure.

  • Altitude of met data.

  • Wind speed (must be entered when greater than 20 knots).

  • Wind direction.
Note: The first four items are not required for the
AN/TPQ-36 radar.


The section TA technician or section chief and the supported unit commander coordinate all other support on an as-required basis to include Class V support for the attached radar section.

Join the GlobalSecurity.org mailing list