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The quality systems of this facility have been registered by UL to the ISO 9001:2000 Series Standards. Recognized as the world leader in safety and survival technologies, ACR has provided safety equipment to the aviation and marine industries as well as to the military since 1956. About Cobham plc Cobham plc is an international company engaged in the development, delivery and support of advanced aerospace and defense systems for land, sea, air and space. The company has four divisions that collectively specialize in the provision of components, subsystems and services that keep people safe, improve communications and enhance the capability of aerospace and defense platforms. CAUTION: Before proceeding to install, test or use your new ACR Electronics’ product, please read this Product Support Manual in its entirety. If you have questions regarding the contents of the manual, please contact our Technical Service Department at ACR Electronics, Inc., Telephone +1 (954) 981- 3333. Please be ready to provide the technician with the page number you wish to discuss. If you have a question that is not covered in the manual, please visit our website and access the Frequently Asked Questions (FAQs) section for further information or call our Technical Service Department. The website address is If in the future you lose this manual, you may access and print a replacement on the ACR website. Table of Contents SECTION ONE- GENERAL _______________________________ 3 SECTION TWO- OPERATING INSTRUCTIONS _______________ 5 SECTION THREE- TESTING AND MAINTENANCE ___________ 7 APPENDIX A – WARRANTY, USEFUL LIFE POLICY, NOTICES 11 PLEASE READ ALL WARNINGS, CAUTIONS AND NOTES CAREFULLY SECTION ONE- GENERAL This publication provides maintenance and operating instructions for the MS-2000(M) Distress Marker Light. 1. Purpose The light is designed and intended to provide aircrew and other personnel with a high-intensity visual distress marker signal for use in the event of unscheduled abandonment of aircraft in isolated regions and other emergency and/or special operational mission situations. 2. General Characteristics . The MS-2000(M) Distress Marker Light is a lightweight, compact, battery operated, portable unit that is designed to be used as a multi- functional light during emergency and/or clandestine special mission situations. The light is designed to attract attention, to assist in location and to facilitate personnel rescue operations in both overt and covert operations. . The light system consists of a main body case containing the electronics, lamp, batteries and the flashguard (FG) shield containing one infrared (IR) and one blue filter. The flashguard also has raised battery polarity indicators to assist in non-visual battery replacement. The case is fabricated of high impact, cut resistant thermoplastic material and designed to insure watertight integrity of the main body case. The light utilizes a xenon strobe lamp, is powered by two AA batteries and is actuated by a magnetic reed switch. The light is designed for one-handed operation and may be operated by either hand or attached to any object. . The flashguard shield contains both an IR and blue filter which are used as safeguards in hostile territories so as to prevent possible signaling confusion (i.e., small arms ground fire) between the signaler and observer. The IR filter provides omni-directional transmission of IR wavelengths. The blue filter is used for line-of-sight (directional) light transmissions. The IR filter is designed for use during clandestine operations. . Electrical power for the MS-2000(M) is provided by two 1.5V, AA, alkaline batteries located in the base of the main body case. A retained battery door is provided with an "O" ring seal to insure its watertight integrity. Additionally, electrical power is controlled by a magnetic reed switch located on the side of the main body case. This switch also insures waterproof integrity of the main body case. 3. Theory of Operation All electrical circuitry comprising the MS-2000(M) strobe light is enclosed within its main body case assembly. These circuits operate to step up the battery voltage to a level sufficient to fire the xenon flash tube. This stepped-up voltage is so timed that the flash tube will fire between 40-60 flashes per minute. IR filter (in storage position), ACR P/N 4459 Blue filter (in storage position), not visible when stored Flashguard, ACR P/N 4463 Strobe lamp Electronics compartment Slide for flashguard ON/OFF magnetic slide switch Lanyard Battery, alkaline “AA” Battery door, ACR P/N 9338 Figure 1 SECTION TWO- OPERATING INSTRUCTIONS a. Turn "ON" Slide switch up until it stops. The strobe should begin flashing within a few seconds. b. Turn "OFF" Slide switch down until it stops. The unit will stop operating. c. White Light With the flashguard shield in the retracted (stored) position, slightly raise the IR filter and rotate it either left/right 90°, push filt...