*TM 10-8470-204-10 TECHNICAL MANUAL …

1 *TM 10-8470-204-10 TECHNICAL MANUAL operator 'S MANUAL FOR ADVANCED COMBAT HELMET (ACH) * TM 10-8470-204-10 , dated 14 March 2008, superseded TM 10-8470-204-10 dated 30 September 2005, including all changes. DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. HEADQUARTERS, DEPARTMENT OF THE ARMY 14 MARCH 2008 TM 10-8470-204-10 a WARNING SUMMARY This warning summary contains general safety warnings and hazardous materials warnings that must be understood and applied during operation and maintenance of this equipment. Failure to observe these precautions could result in serious injury or death to personnel.

2 WARNING For first aid treatments, refer to FM WARNING All seven helmet pads must be worn during airborne operations and should be worn during other high-risk operations such as air assault and rappelling/mountaineering. Failure to observe this precaution could result in serious injury or death because all seven pads provide maximum impact protection. WARNING For training and combat missions, Soldiers are to utilize the 7-pad configuration only. For non-training and non-combat missions (for example, parades, ceremonies, etc.) the 5- and 6-pad configurations are authorized.

3 Failure to observe these precautions could result in serious injury or death to personnel. WARNING The hardware for the ACH helmets where the chin strap retention system webbing attaches to the helmet shell must be covered by padding during airborne and other high risk operations such as air assault and rappelling/mountaineering. The oblong/oval pads must be placed flush with the rim (edge) of the helmet and completely cover the hardware. Failure to observe this precaution could result in serious injury or death to personnel because a hard-point could contact the Soldier s head. TM 10-8470-204-10 b WARNING Helmet must fit properly.

4 If you experience fit problems, tightness or looseness, or helmet profile is too high or too low refer to Sizing and Fitting Troubleshooting guidelines. Failure to observe this precaution could result in serious injury or death to personnel. WARNING When donning the helmet for the first time in a cold environment, it is necessary to wear the helmet for a few minutes or otherwise warm the pads, such as by placing in pockets, so that the pads will conform to the shape of your head. As the pads warm up and conform to the shape of your head, it may be necessary to retighten the chin strap retention system.

5 Failure to observe this precaution could result in serious injury or death to personnel. WARNING If you pull too tightly on any strap while putting on the helmet, or if you don t position helmet on head and hold in place with one hand on top of helmet for initial adjustment, the helmet may become uncomfortable and tilted on your head and chin cup may become un-centered. Failure to observe this precaution could result in serious injury or death to personnel. WARNING The rear trapezoidal pad must be placed flush with the rim (edge) of the helmet for airborne operations. If you experience helmet rotation during airborne operations, the rear trapezoidal pad can be placed so that it extends " beyond the rim of the helmet.

6 Placement of the rear trapezoidal pad flush or beyond the rim (edge) of the helmet prevents the hard shell from hitting your neck. Failure to observe this precaution could result in serious injury or death to personnel. TM 10-8470-204-10 A/B blank LIST OF EFFECTIVE PAGES/WORK PACKAGES NOTE: This MANUAL supersedes TM 10-8470-204-10 dated 30 September 2005. Zero in Change No. column indicates an original page or work package. Date of issue for revision is: Original 14 March 2008 TOTAL NUMBER OF PAGES FOR FRONT AND REAR MATTER IS 22 AND TOTAL NUMBER OF WORK PACKAGES IS 25, CONSISTING OF THE FOLLOWING: Page/WP No.

7 Change No. Page/WP No. Change No. Front Cover 0 Chp 3 title page 0 Warning 0 WP 0014 (12 pgs) 0 i-x 0 Chp 4 title page 0 Chp 1 title page 0 WP 0015 (2 pgs) 0 WP 0001 (2 pgs) 0 WP 0016 (2 pgs) 0 WP 0002 (20 pgs) 0 WP 0017 (2 pgs) 0 WP 0003 (2 pgs) 0 WP 0018 (4 pgs) 0 Chp 2 title page 0 WP 0019 (6 pgs) 0 WP 0004 (6 pgs) 0 Chp 5 title page 0 WP 0005 (6 pgs) 0 WP 0020 (2 pgs) 0 WP 0006 (12 pgs) 0 WP 0021 (6 pgs) 0 WP 0007 (8 pgs) 0 WP 0022 (2 pgs) 0 WP 0008 (8 pgs) 0 WP 0023 (4 pgs) 0 WP 0009 (10 pgs) 0 WP 0024 (2 pgs) 0 WP 0010 (8 pgs) 0 WP 0025 (2 pgs) 0 WP 0011 (4 pgs) 0 Back Cover 0 WP 0012 (8 pgs) 0 WP 0013 (10 pgs) 0 *TM 10-8470-204-10 i HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON, , 14 MARCH 2008 TECHNICAL MANUAL operator 'S MANUAL FOR ADVANCED COMBAT HELMET (ACH) * TM 10-8470-204-10 , dated 14 March 2008, superseded TM 10-8470-204-10 dated 30 September 2005, including all changes.

8 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this MANUAL . If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter or DA Form 2028 (Recommended Changes to Publications and Blank Forms), located in the back of this MANUAL , directly to: Commander, TACOM Life Cycle Management Command, ATTN: AMSTA-LC-SECT, Kansas St., Natick, MA 01760. You may also send in your recommended changes via electronic mail or by fax. Our fax number is (DSN 256-5205, and commercial number 508-233-5205).

9 Our e-mail address is A reply will be furnished to you. *TM 10-8470-204-10 ii TABLE OF CONTENTS WP Sequence No. Page No. Warning Summary How to Use This MANUAL Chapter 1 General Information, Equipment Description and Data, and Theory of Operation General Information .. WP 0001 Equipment Description and Data .. WP 0002 Figure 1. Major Components (SDS, MSA, Gentex H, and Rabintex ..0002-2 Figure 2. Major Components (Gentex X) ..0002-3 Figure 3. Helmet Shell (All Models) ..0002-4 Figure 4. Pad Suspension System (All Models) ..0002-5 Figure 5. Chin Strap Retention System with Hardware (MSA, SDS, Gentex H, and Rabintex).)

10 0002-6 Figure 6. Chin Strap Retention System with Hardware (Gentex X) ..0002-7 Figure 7. Hardware (MSA Early Version) ..0002-8 Figure 8. Hardware (MSA Later Version) ..0002-9 Figure 9. Hardware (MSA Current Version) ..0002-10 Figure 10. Hardware (SDS) ..0002-11 Figure 11. Hardware (Gentex X) ..0002-12 Figure 12. Hardware (Gentex H) .0002-13 Figure 13. Hardware (Rabintex)..0002-14 Figure 14. Reversible Helmet Cover (Woodland/Desert, All Models) ..0002-15 Figure 15. Non-Reversible Helmet Cover (White and Universal Camouflage, All Models)..0002-15*TM 10-8470-204-10 Table of Contents Continued iii Figure 16. Eyewear Retention Strap (All Models) .. 0002-16 Figure 17.