UNCLASSIFIED//

Subject: Safety Of Use (SOU) Message, TACOM Life Cycle Management Command,

(TACOM LCMC) Control No. SOU 09-001, "Operational", Uncontrolled Turret

Movement. Line Item Number (LIN) A93374, Armored Security Vehicle (ASV),

NSN 2320-01-437-6957, Entire fleet of vehicles affected Total Density; 1419

vehicles (as of 16 May 08), number affected in SWA (Southwest Asia) approx

1000.

D XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX D

A X "WARNING" X A

N X SERIOUS INJURY TO SOLDIERS, OR DAMAGE X N

G X TO EQUIPMENT MAY OCCUR IF THE INSTRUCTIONS X G

E X IN THIS MESSAGE ARE NOT FOLLOWED. X E

R XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX R

REFERENCE: Safety of Use (SOU) Message, TACOM LCMC Control No. SOU 08-022,

ASV, Uncontrolled Turret Movement.

1. Distribution:

a. This is an Operational Safety-Of-Use-Message. Commanders/Directors of

Army Commands (AC)/Army Service Component Commands (ASCC)/Direct Reporting

Units (DRU), Army National Guard (ARNG), US Army Reserve (USAR) Command and

other Service Commanders and Responsible Offices will retransmit this

message to all subordinate Commanders/Activities within 24 hours of receipt

of this message and will, within 5 working days, acknowledge receipt of this

message by e-mail to or by telephoning DSN

786-6096, Commercial (586)574-6096 or in writing to Commander, TACOM Life

Cycle Management Command (TACOM LCMC), ATTN: AMSTA-LC-LMPM, 6501 E. 11 Mile

Rd., Warren, MI48397-5000.

b. Commanders/Directors of Army Commands (AC)/Army Service Component

Commands (ASCC)/Direct Reporting Units (DRU), Army National Guard (ARNG), US

Army Reserve (USAR) Command, other Service Commanders and other Responsible

Offices, will also track and report compliance of this message for all

subordinate Commands/Activities to: ASV: Mr. Frank Cox, Equip Spec. (Auto),

AMSTA-LC-CHMF, DSN 786-7553, Commercial 580-574-7553, email:

, or Ms. Denise Jackson, Logistics Manager, ASV,

SFAE-CSS-TV-A, DSN 786-6561, Commercial 586-574-6561,

; NLT: 30 Days from date of this message.

2. PROBLEM: REVISION OF SOUM 08-022 TO REFLECT THE CORRECT NATIONAL STOCK

NUMBER (NSN) AND PART NUMBER RELATED TO TURRET TRAVERSE MOTOR POWER RELAY

MALFUNCTION. ALL CHANGES TO SOUM 08-022 ARE IN ITALICS.

a. An incorrect National Stock Number and part number were issued in

SOUM 08-022. The correct NSN is 2920-01-395-3879 and the correct part number

is SBC-4401D with a cage code of 24975.

b. If you order part number 6288971 and NSN 5945-01-262-2018 you will

receive the wrong part.

c. Due to high Operation Tempo (OPTEMPO) in Operation Iraqi Freedom

(OIF)/Operation Enduring Freedom (OEF), power relays 2ea in the ASV turret

are reaching their intended life span earlier than originally estimated.

Relay life span is further reduced by frequent, quick, and repetitive

slewing back and forth of the turret.

d. As the power relay wears down, there is potential that the turret

traverse motor power relays will short, causing the turret to continue to

spin after the traverse switch has been released. In an uncontrolled

situation where the turret traverse switch does not stop the turret, the

turret can only be stopped by shutting down either, the Turret Power or the

Master Power switches located in the driver's compartment.

e. Gunners in the turret have had their feet crushed between the turret

basket and the hull when the turret continued to spin and the gunner did not

have all body parts within the basket.

3. User Actions:

a. Users must operate the turret IAW the instructions that are listed in

TM 9-2320-307-10, and TM 9-2320-309-10. TM 9-2320-309-10, chapter 2-5,

lists the warnings for safe operation of the turret.

(1) Failure to follow these instructions may result in damage to

equipment and injury to personnel. TM 9-2320-307-10, chapter 2-3, fig 2-2,

shows both the Turret Power and master Power switches.

(2) You can find these pages in Army Electronic Product Support (AEPS)

under turret SOUM. These pages can be found at:

f

WARNING

Make sure all personnel are clear of the turret and basket area before

operating the turret or personnel injury may result.

b. If an incident occurs where the turret continues to spin after the

traverse switch has been released, the only way to shut the power off to the

turret is for the gunner to immediately inform the driver to turn-off the

Turret Power or the Master Power switches located in the driver's

compartment. See paragraph 3.d(2) below, which now establishes a requirement

that a qualified driver must be in the driver's compartment, prior to

traversing the turret.

c. Based on the failure analysis study conducted by the Product Director

ASV, the root cause is likely due to a power relay malfunction. Remove the

vehicle from service and replace the traverse motor power relays 2ea,

located in the POWER RELAY UNIT (PRU).

(1) Turn off all electrical accessories. Place master power switch to

the OFF position. Isolate the power by disconnecting the negative battery

power supply cable from battery.

(2) If you need assistance see the link below for the removal and

replacement of the relay:

.pdf

(3) Contact the TACOM LCMC Logistics Assistance Representative (LAR)

and/or the TEXTRON FSR immediately with a detailed report of the

circumstances of the event. See paragraph 6.c. below for contact directions.

d. Additionally, as with all Army turreted systems, the following

principles for safe operation of the turret must be followed:

(1) Personnel must keep all body parts inside the turret at all times;

except when entering and exiting the turret.

(2) The turret power will not be activated unless there is a qualified

driver in the driver's compartment.

(3) Gunners should not enter or exit the turret unless the gunner has

verified with the driver, through the intercom system, that the Turret Power

or the Master Power switches are in the off position.

e. Do not attempt to change direction of travel until the turret has

come to a complete stop.

f. Units will not modify the turret's traverse switch.

g. Unit Commanders, contact your local TACOM LCMC Logistics Assistance

Representative (LAR) or your Field Service Representative (FSR) upon receipt

of this message for assistance. For assistance in locating your TACOM LCMC

LAR, see paragraph 6.c.

4. TACOM LCMC/PM actions:

a. Product Director, ASV has completed a failure analysis study on the

failed traverse motor power relays. No evidence of a latent defect in the

relays was found.

b. Product Director ASV through its Field Service Representatives, is

aiding units in determining which ASVs may need replacement of the relays.

c. TACOM issued an updated LARs-All message on 28 Jul 08 to correctly

identify the NSN for the relays.

d. TACOM will also identify the correct NSN for the relays in the new

technical manual (under development and estimated for completion in

September 2009).

e. Product Director, ASV submitted an article on this issue for

publication in the Preventive Maintenance Monthly Magazine (estimated for

fall 2008).

f. Product Director, ASV is developing a turret proportional control

switch to address this issue. A field retrofit of a completed switch is

planned for 3rd Quarter, FY 2009.

5. Supply Status:

a. The part number is SBC-4401D; cage code 24975, and the NSN is

2920-01-395-3879. The Defense Logistics Agency (DLA) has been notified of a

potential surge in orders. There are currently 158 relays on hand as of 26

August 2008.

b. DLA continues to procure requisite quantities of relays.

6. POCs:

a. Frank Cox, DSN 786.7553, Comm# 586-574-7553, email:

.

b. Denise Jackson, DSN 786.6561, Comm# 586-574-6561, email:

.

c. To find your TACOM LCMC LAR, you must be a registered user in the

AEPS database. If you are a registered user, then click on this link:

then select the appropriate region; i.e. Continental United States (CONUS),

Europe, Far East, and Southwest Asia SWA. Select the location nearest you

and click on a name. This will give you a LAR's name, DSN and commercial

phone number, email address, and photo.

(1) If you are not a registered user, request access at the public page:

then click on "Access Request Form"

and follow the instructions for obtaining an AEPS userid. If you don't have

access to AEPS, you can also obtain this information by contacting the TACOM

LCMC Senior Command Representative (SCR) for your area.

(2) CONUS-East Region includes all Active Duty, National Guard and

Reserve Units in Wisconsin, Illinois, Michigan, Indiana, Ohio, Kentucky,

Tennessee, Mississippi, Alabama, Georgia, Florida, Louisiana, South

Carolina, North Carolina, Virginia, West Virginia, Maryland, Delaware,

Pennsylvania, New Jersey, Connecticut, Rhode Island, Massachusetts, New

York, New Hampshire, Vermont, Maine and FORSCOM. CONUS-East SCR can be

reached at DSN 236-6921, Commercial 910-396-6921.

(3) CONUS-West Region includes all Active Duty, National Guard and

Reserve Units in North Dakota, South Dakota, Minnesota, Nebraska, Iowa,

Missouri, Kansas, Oklahoma, Arkansas, Texas, Colorado, Montana, and Wyoming.

CONUS-West SCR can be reached at DSN 737-0263, Commercial 254-287-0263.

(4) Pacific Region includes all Active Duty, National Guard and Reserve

Units in Washington, Oregon, Idaho, Nevada, Utah, Arizona, Alaska, Hawaii,

California, New Mexico and Guam. Pacific SCR can be reached at DSN 357-2991,

Commercial 253-967-2991.

(5) Europe Region includes all Active Duty, National Guard and Reserve

Units in Great Britain, Germany, Belgium, Luxemburg, Italy, Bosnia, Kosovo,

and Macedonia. Europe SCR can be reached at DSN 314-375-3461, Commercial

01149-621-487-3461, in Germany, 0621-487-3461.

(6) Far East Region includes all Active Duty, National Guard and Reserve

Units in Korea, Okinawa, Kwajalein, and Japan. Far East SCR can be reached

at DSN 315-721-7101, commercial 011-82-2-2270-7101.

Classification: UNCLASSIFIED

Caveats: FOUO

Classification: UNCLASSIFIED

Caveats: FOUO