A Small August Correction

The August Issue of PS Magazine, Issue 741, will soon be in your motor pools and day rooms. It’s bursting at the staples with great information, but it does have one slight error. In the head art on the article at the bottom of page 39 on the AN/PED-5, Laser Target Locator Module, something is not quite right. Can you see what it is?


Yep! You guessed it. The talking locator module is not the AN/PED-5! This is the AN/PED-5!


So, print out this Blog page. Cut out these pictures. And when the August Issue of PS arrives, paste these pictures over the picture that is wrong. (Or you can just make a mental note. It’s up to you.) However, you correct it, remember, to err is human and to forgive is divine. (Despite what your drill sergeant might have demonstrated.) MSG Half-Mast


Team ASV Needs Your Help

The Armored Security vehicle (ASV) sustainment team needs your help. They’re checking on what MWOs have been applied to each M1117 ASV so the Modification Management Information System (MMIS) database can be brought up to date.

The ASV team asks that you physically check for each MWO application, not just the MWO tag, and update the MMIS database. You’ll find MMIS on the LOGSA LIW website:


Here is a list of all ASV MWOs, along with artwork showing each application for quick recognition:

9-2320-307-23-1 VSRC ASV126 ASV2723 PM ASV ALL
9-2320-307-55-1 AFES ASV109 ASV2464 PM ASV ALL
9-2320-307-23-13 Master Battery Disconnect ASV132 ASV2880 ALL
9-2320-307-50-13 Upper Rear Door Torsion Bar ASV111 ASV2464 PM ASV ALL
9-2320-307-23-18 Seatbelt Retrofit ASV101 ASV1603 PM ASV ALL
9-2320-307-23-15 Emergency Crew Extraction ASV093 ASV2464 PM ASV ALL
9-2320-307-23-17 Trans Switch Interlock Ground ASV087 ASV1272 PM ASV ALL
9-2320-307-40-1 Side Door Torsion Bar Cover ASV105R1 ASV1898 PM ASV ALL
9-2320-307-23-16 Hydraulic Seat Improvement ASV066 ASV1048 PM ASV ALL
9-2320-307-23-6-9 Skid Plate ASV134 ASV2543
9-2320-307-23-10 AC panel ASV124 ASV1948

MWO 9-2320-307-23-1 -Variable Slew Rate Controller (VSRC). This can be recognized by the joystick controller used to traverse the turret.




9-2320-307-55-1 – Crew AFES. This is recognized by finding the manual discharge and fire bottles installed on the front left wheel well of the driver’s side of the vehicle.


9-2320-307-23-1 – Master Battery Disconnect Switch. This is recognized by a switch installed on the front of the battery box. The battery box is on the right when entering the driver’s side door.


MWO 9-2320-307-50-13 – Upper Rear Door Torsion Bar. You’ll find this by lifting the rear upper door to the tunnel compartment. If there is an assist device, the MWO has been installed.


MWO 9-2320-307-23-18 – Seatbelt Retrofit. This can be identified by the location of the seatbelt tensioners. New tensioners are mounted at the bottom of the seat as opposed to the top. Also, the new seatbelt manufacturer is Indiana Mills. Seatbelts manufactured by AM-Safe are no longer authorized.


A properly outfitted seatbelt configuration.


MWO 9-2320-307-23-15 – Emergency Crew Extraction. This can be recognized by the sliding bar between the gun port and the handle on the upper side doors. Also, the extraction tool will be mounted on the underside of the winch hatch.


MWO 9-2320-307-23-17 – Transmission Switch Interlock Ground. This can be identified by a proximity switch located on the parking brake pedal support bracket (Item #11).

UntitledUntitledMWO 9-2320-307-40-1 – Side Door Torsion Bar Cover. This can be identified by checking for an angled flange on the torsion bar cover where the cover meets the hull below the side door opening.

New Cover


Old Cover


MWO 9-2320-307-23-16 – Hydraulic Seat Improvement. This is easily identified by the type of seat controller used.

Old Seat Controller


New Seat Controller

UntitledMWO 9-2320-307-23-6-9 – Skid Plate Modification. This can be identified by visual inspection of the skid plate.

Old Skid Plate Configuration


New Skid Plate Configuration     


 MWO 9-2320-307-23-10 – Rear A/C Panel Modification. Remove the one securing screw to the rear A/C unit and swing it open. Look at the three screws marked as Item #4 below. If they are flat head rather than hex head (as is Item #1), the modification has been completed.


Questions? Contact TACOM’s Kevin Fritz at DSN 786-4945, (586) 282-4945, or by email:


Yellow Book Online to Meet Demand

Since its first printing in November 1974, the Hazard Classification of United States Military Explosives and Munitions, commonly called the Yellow Book, has been the ammo expert’s constant companion.

The handy, pocket-sized publication is a convenient and easily understood guide to basic ammunition classification. It remains the most commonly used reference in the field.

However, budget cuts have limited hard copy printings of the Yellow Book. And right now, demand is far higher than supply.

To avoid long delays in getting hard copies, users are encouraged to print their own copies locally. An electronic version of the Yellow Book is available on the Defense Ammunition Center website. You’ll need your CAC. Be sure to choose the email certificate when you log in. Go to:


Under the “Available Products” tab on the left side of the page, click on HC Yellow Book.

If you have questions about the hard copy or online Yellow Books, email:


Most of the info in the Yellow Book comes from the Joint Hazard Classification System (JHCS), the Department of Defense’s only official source of hazard classification data. If you have Internet access, the JHCS is the best source for getting good ammo information.

If you have a CAC, you can register to access the JHCS at:


Yellow Book

Order the New 60K BTU IECU

There is a new 60K BTU Improved Environmental Control Unit (IECU), NSN 4120-01-543-0741, LIN B29108, available that replaces the legacy Military Standard ECUs 54K, 60K, and 66K BTU FDECU models (LINs A26852 and A25860). These legacy MIL-STD ECUs will soon be obsolete. Units need to update their authorizations, turn-in the MIL-STD ECUs to DLA Disposition Services, and contact Program Manager Expeditionary Energy & Sustainment Systems (E2S2) to receive the replacement 60K BTU IECU. PM E2S2 POCs are: Israel Sanchez, 703-704-1080, israel.sanchez@us.army.mil and Jerome Walker, 703-704-3198, jerome.walker@us.army.mil.

HEMTT Base/A1/A2/A4 Models . . . TMs Keep ‘Em Running

Your HEMTT is ready to go as long as you’ve got the right technical manuals. Here’s a list of all the TMs that support the HEMTT’s Base, A1, A2 and A4 models:

IETM TM 9-2320-279-14&P (EM 0290)
Hand receipt TM 9-2320-279-10-HR
M977 cargo TM 9-2320-428-10
M978 tanker (with and without winch) TM 9-2320-429-10
M983 tractor TM 9-2320-430-10
M984A1 wrecker (Volumes 1 & 2) TM 9-2320-431-10-1

TM 9-2320-431-10-2

M985 cargo (with and without winch) TM 9-2320-432-10
M985 guided missile transport TM 9-2320-433-10
M1120 load handling system TM 9-2320-434-10
M1977 common bridge transporter TM 9-2320-435-10


IETM TM 9-2320-325-14&P (EM 0289)
Hand receipt TM 9-2320-325-10-HR
M977A2 cargo TM 9-2320-347-10
M978A2 TM 9-2320-348-10
M983A2 tractor TM 9-2320-349-10
M983A2 light equipment transporter TM 9-2320-420-10
M984A2 wrecker (Volumes 1 & 2) TM 9-2320-421-10-1

TM 9-2320-421-10-2

M985A2 cargo (with and without winch) TM 9-2320-422-10
M985A2 guided missile transport TM 9-2320-423-10
M1120A2 load handling system TM 9-2320-424-10
M1977A2 common bridge transporter TM 9-2320-425-10


IETM TM 9-2320-326-14&P (EM 0289)
Hand receipt TM 9-2320-326-10-HR
M977A4 cargo (with and without winch) TM 9-2320-338-10
M978A4 tractor TM 9-2320-339-10
M983A4 tractor TM 9-2320-340-10
M983A4 light equipment transporter TM 9-2320-341-10
M984A4 wrecker (Volumes 1 & 2) TM 9-2320-342-10-1

TM 9-2320-342-10-2

M985A4 cargo (with and without winch) TM 9-2320-343-10
M985A4 guided missile transport TM 9-2320-344-10
M1120A4 load handling system TM 9-2320-345-10
M1977A4 common bridge transporter TM 9-2320-346-10


M113-Series FOV…Battery PM Keeps Mission On Track


Crewmen, when it comes to your M113’s batteries, a little diligence goes a long way. Check out these PMCS tips to make sure battery troubles don’t fizzle out your mission before it begins.

1. Use both hands to check the battery retainers and clamp. If the batteries move or seem loose, let your mechanic know.

2. Same thing with the battery connections. If you can twist the connector with your thumb and first two fingers, it needs to be tightened.

3. Check to see if the cables are connected tightly to the clamp. If not, report ‘em.

4. Check the battery cells. The electrolyte should cover the plates and reach the bottom edge of the vent plugs. If any are low or completely dry, fill them with distilled water. You’ll get six 1-gallon bottles of distilled water when you order NSN 6810-00-682-6867.

5. Take a rag and clean the battery, making sure to wipe off the battery case and surrounding metal parts. While you’re at it, look for missing or damaged rubber boots on the terminal covers. Tell your mechanic and he’ll replace ‘em with NSN 2530-01-089-4992.

6. Give each terminal a light coat of GAA.

Get the complete scoop on keeping your M113’s batteries in top shape by checking out WP 0085-00 of TM 9-2350-261-10 and WP 0104 of TM 9-2350-277-10. For even more battery info, check out TM 9-6140-200-13, Operator and Field Maintenance for Automotive Lead-Acid Storage Batteries.


Up-armored HMMWVs…When A/C Blows Hot, Don’t Lose Your Cool

MS-5819 photo

Is the air conditioning in your up-armored HMMWV blowing hot air instead of cool? Where most people come from, that’s called a heater, not A/C!

The culprit could be a bad A/C flow control valve. So before you turn your truck over to a mechanic for extensive troubleshooting, try this test:

Manually activate the valve by pressing in on the cylinder. If cold air starts blowing, that’s your problem.

Tell your mechanic and he’ll replace the flow control valve, NSN 4810-01-536-3832.