M1A2 SEP Tank…Avoid Slave Start Woes

Crewmen, slave start your M1A2 SEP tank the wrong way and you can seriously damage the generator drive shaft and the vehicle’s charging system.

A broken generator drive shaft makes your tank NMC. Replacing the shaft is a big headache because the power pack has to be pulled. In some cases, you may even have to replace the transmission.

gen drive shaft

You can avoid a lot of trouble and expense by slave starting your tank the right way. The steps in bold are different from what’s in the TM:

  1. Ensure all electronics are powered down on both the live tank and dead tank, including the Force XXI Battle Command Brigade-and-Below (FBCB2).
  2. To prevent damage, the external slave receptacle should be used whenever the situation allows. On both tanks, connect the battery box power cable by removing the protective cap and remounting the cable from the storage position to the power receptacle.
  3. For tanks equipped with 4.4.01 and earlier software, set the left battery compartment circuit breaker to OFF.
  4. Turn on Master Power for the live tank.
  5. Start the live tank.
  6. Plug the slave cable into the live tank.
  7. Plug the other end of the cable into the slave receptacle on the dead tank.
  8. Turn on Master Power for the dead tank.
  9. Check that the Parking Brake Set message appears on the improved driver’s integrated display (iDID) of the dead tank.
  10. Set tach idle on the live tank to ON.
  11. With iDID on the main menu, press the Power Sources pushbutton on both tanks.
  12. Make sure M is highlighted on the NATO UTL PWR A/M pushbutton on both tanks.
  13. Press the Battery Start P/A pushbutton until A is highlighted on the dead tank.
  14. Wait until the dead tank reaches 26 volts. This could take 15 minutes to one hour.
  15. Start the dead tank.

For vehicles equipped with 4.4.01 and earlier software, follow these instructions set the left battery compartment circuit breaker to ON.

  1. With iDID on the main menu, press the Power Sources pushbutton on both tanks.
  2. Make sure A is highlighted on the NATO UTL PWR A/M pushbutton on both tanks.
  3. Remove the slave cable from both tanks.
  4. Re-cap the slave receptacles.
  5. Let the dead tank recharge its batteries for a minimum 30 minutes using its own generator with tach idle on.

Stryker…Shift Away Transfer Case Damage

Drivers, that grinding noise you hear when you shift your Stryker’s transfer case into low gear on the fly is more than just annoying. It could mean that you’ve done some serious-and expensive-damage to the transfer case.


You must bring your vehicle to a complete stop before shifting the transfer into low. If you don’t, the transfer case might start complaining loudly. Vital parts can crack, meaning you might be unable to shift it at all. Replacing the transfer case will set your unit back more than $21,000 for a flat bottom Stryker and more than $38,000 for a double V-hull Stryker!

Here’s the right way to shift your Stryker’s transfer case into low gear:

  1. Come to a full stop.
  2. Apply the service brakes.
  3. Put the transmission in neutral.
  4. Apply the parking brake.
  5. Shift the transfer case to low.
  6. Release the parking brake.
  7. Put the transmission in D (drive).

Now you’re ready to drive without doing any damage.

transmission selector

BB-2590/U Rechargeable Battery…Update Battery Charger Software

The BB-2590/U rechargeable lithium-ion battery is great because it’s lightweight and its charge lasts a long time. But if you don’t charge it the right way, you could be in for trouble.

BB-2590 Battery

Using chargers with out-of-date software can cause a fire. One recent fire caused $5.5 million in damage! Follow these tips to avoid expensive damage to equipment and personnel injuries:

  • Battery maintenance. First, fully charge lithium-ion rechargeable batteries before using them the first time and at least once a year afterwards. Don’t use commercial versions of Army-issued batteries or chargers. They aren’t approved for military use.

Batteries approved for military use will have a contract number above the date code. Military-approved chargers have the contract number listed on the charger faceplate.

  • Inspection. Check the program label on your charger to find if its software needs to be updated. The correct software version is Program H for PP-8498/U soldier portable chargers (SPC), NSN 6130-01-495-2839, and Program C for PP-8481B/U vehicle mounted chargers (VMC), NSN 6130-01-527-2726. Note that the PP-8481A/U charger on the move (COTM), NSN 6130-01-494-9164, cannot be updated.
  • Software update. If you need updated software, go to this website to download and install the correct version:


   You’ll need a USB-to-serial cable such as NSN 6150-01-558-7214, or a DB9 male to DB9 female serial cable with straight through connections. Do not use a null cable.

  • Monitored charging. If you have to charge batteries before you can update your charger’s software, don’t leave the charger unattended. That’s a fire hazard. Signs of trouble include batteries that are hot to the touch or have smoke coming from them. It’s a good idea to always keep a fire extinguisher on hand while the charger is in use.

Also, don’t charge more than two batteries at the same time if the software is out of date.

Check out the user manual or the matrix printed inside the charger lid. Both’ll tell you how to properly interpret the charger lights so you can avoid overcharging the batteries.


Logistics Management . . .Fire Support Command and Control Systems Added to MMDF

PM Mission Command has added several Fire Support Command and Control (FSC2) Systems to the Maintenance Master Data File (MMDF). The 5 LINs/8 NSNs added are as follows:

AN/GYK-56 Client/EMT 7010-01-501-1560 C05018
AN/GYK-63(V)2 AFATDS 7010-01-560-8112 C05032
AN/GYK-63A(V)2 AFATDS 7010-01-642-0638 C05032
AN/GYK-63A(V)3 AFATDS 7010-01-644-2212 C05032
AN/PSG-10(V)3 PFED 7010-01-538-9663 C05011
AN/PSG-14A(V)1 LFED 7010-01-624-0393 C04819
AN/PSG-14A(V)2 LFED 7010-01-623-9078 C04819
AN/PYG-1A(V)1 Centaur 7010-01-620-2824 C53293


The MMDF is a USAMC Logistics Support Activity (LOGSA) product that identifies the Army’s readiness-reportable equipment and systems. If your equipment is in the MMDF that means you must report its readiness status. That requirement is found in Para 2-6b of AR 700-138, Army Logistics Readiness and Sustainability (Feb 04). It applies to Active Army, Army National Guard and Army Reserve.

You should also review AR 750-1, Army Materiel Maintenance Policy (Sep 13), for additional guidance.

Where to Find the MMDF

You’ll find it online in the LOGSA Logistics Information Warehouse (LIW):


   Request access through your supervisor and security manager. For MMDF issues or support, call DSN 645-9682, (256) 955-9682, or email:


Got FSC2 Questions?

For FSC2 Systems questions, contact Scott (Scottee) Welsh, DSN 648-1012, (443) 395-1012, e-mail:



Adam Santini, DSN 648-1013, (443) 395-1013, email:


Chinook Alternate Covers Approved

Mechanics, your Chinooks come with primary covers for different parts of the aircraft. You’ll find these covers listed in the TMs.

In case you don’t have the primary covers on hand, the Chinook headshed has provided three approved alternate covers for the pitot tube, the T-714 engine, and the rotor head:

Item NSN 1730-
Pitot tube cover 01-645-1206
T-714 engine maintenance cover 01-646-0357
Rotor head maintenance cover 01-646-0358


These covers come from a third party source and the NSNs won’t be added to the TMs, so make a note. If you order the covers, you have the option of a free, three-part, on-site training session from the manufacturer. To arrange for the training, contact:

Mark Bechtel

Shield Technologies Corporation



The three part training covers:

  • information about the unique anti-corrosion cover technology and how it benefits your aircraft and equipment.
  • hands-on training to properly install, remove and care for the covers.
  • a CD with written instructions on how to properly install, remove and care for the covers.

The CD also helps train new Soldiers and provides refresher training.

The training prevents damage to aircraft, components and equipment, while extending the life of the covers.         Primary Cover NSNs

Here’s a list of the primary covers for the Chinook. Keep this as a handy reference.

# ITEM NSN 1730- PN
1 Engine exhaust cover 01-593-9707 CH-47-202
2 Forward rotor head cover 01-593-9690 CH-47-063
3 FWS XMSN oil inlet cover 01-593-9716 CH-47-068
Aft rotor hub cover 01-593-9723 CH-47-064
4 Hyd/oil cooler exhaust vent cover set 01-593-9684 CH-47-067
5 APU tail cone exhaust cover 01-593-9515 CH-47-150
6 Center console set cover 01-593-9662 CH-47-127
7 Air inlet and oil cooler exhaust cover 01-593-9697 CH-47-124
8 Cockpit enclosure (windshield and nose) 01-593-9636 CH-47-128
9 Aircraft engine right-hand cover 01-593-9359 CH-47-060
10 Aircraft engine left-hand cover 01-539-9488 CH-47-059

Note: Both 9 and ten depict covers designed for two configurations, one with and one without the external air particle separator (EAPS) and engine exhaust installed.

The manufacturer of these covers will also provide hands-on training if requested.

The POC is:

Jim Crotty

Cocoon, Inc.



Everything You Need for UMARK

Mechanics, the last time we told you about the unit maintenance aerial recovery kit (UMARK), it was about checking for defective slings (https://www.logsa.army.mil/psmag/archives/PS2011/703/703-38-39.pdf).

Here’s some additional information to keep your UMARK, NSN 8145-01-487-0841, in operation. The UMARK has everything you need for aircraft recovery. The entire system comes in three boxes. Here’s a list of NSNs to keep handy for a quick parts inventory:

UMARK Box 1, Slings
Item NSN Part No.
UMARK usage tracking form
Green/white sling, 12 1/2 feet 3940-01-538-5739 94D519-1
Blue/white sling, 30 feet 3940-01-538-9499 94D519-4
Red/white sling, 17 1/3 feet 3940-01-539-1505 94D519-3
Yellow/white sling, 13 3/4 feet 3940-01-539-0534 94D519-2
Black/white sling, 10 feet 3940-01-538-6784 94D519-5
Black/white sling, 30 feet 3940-01-538-6732 94H520-1
Black/white sling w/bridle attachment, 30 feet 3940-01-538-5218 94H520-2
Sling retainer assembly 3940-01-543-9075 1012736
Sling sheath, 34 inches 1650-01-632-6759 1024781-1
Sling sheath, 6 feet 1650-01-632-6753 1024781-3
Hard Card 94J500-401
UMARK inventory card case 1 1037403-001
UMARK Box 2, Crossbar Assembly
Item NSN Part No.
Crossbar assembly 3940-01-538-3471 94H501-1
UMARK inventory card (case 2) 1037403-003
UMARK Box 3, Link/Lifting Assembly
Box link assembly 3940-01-538-9452 94C524-1
Sling link assembly 3940-01-538-0291 94H523-1
25K clevis assembly 4030-01-539-0567 94D514-1
Lifting clevis assembly 5340-01-539-1932 94D509-1
CH-47 hook thimble 4030-01-549-4538 94C533-1
AH-1 mast wedge 1680-01-539-3155 94D529-1
Blade bag 1615-01-570-5418 94J516-1
UH-1 square wedge 5340-01-538-4723 94D528-1
Drogue chute 1670-00-391-8499 1670EG029B3
OH-58D sight wedge 5430-01-538-5104 94D527-1
Snapless tie-down 1670-01-541-1132 94C522-2
Fixed length tie-down 1670-01-538-2808 94C522-1
Adjustable length tie-down sling 1670-01-538-2835 94H521-1
OH-58C mast wedge 5340-01-538-4862 94D530-1
Shackle, 6 1/2-ton 4030-01-568-0061 1020496
Sling extension 1670-01-538-8611 94H521-2
Blade pole assembly 1730-01-617-3781 94J531-1
Sling sheath, 8 feet 1650-01-632-6756 1028532
UMARK inventory card 1037403-005

IHADSS… Halt! Get Software Upgrade for HOLT

If you maintain or use the helmet operational level tester (HOLT), NSN 4931-01-534-1228, for the Apache integrated helmet and display sight system (IHADSS), make sure you have the latest version 8 software update.

The previous update, version 7, had reset issues that kept the HOLT from functioning properly during start-up. To determine which software version your HOLT has, turn the power switch to the ON position. The software version will be listed on the second line of the first screen of the built-in test (BIT).

If your HOLT has the wrong software update, get a software update kit by contacting James Casto at (586) 282-1359 or by email:


Be sure to provide a good shipping address and POC so an upgrade kit can be mailed to you.