About Cobham Life Support, ACR Products Cobham Life Support, ACR Products www.acrelectronics.com, designs and manufactures a complete line of safety and survival products including EPIRBs, PLBs, AIS, SARTs, Strobe Lights, Life Jacket Lights, Search Lights and safety accessories. 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 www.acrelectronics.com. 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

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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 multifunctional 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. within a few seconds. The strobe should begin flashing
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 filter in to lock into place. (See Figure 2)

Stored

Rotate
Figure 2 d. IR Light With the flashguard shield in the retracted (stored) position, insure that the IR filter is resting on the top (vertical) end of the light over the clear lens, then push filter down to lock into place. (See Figure 3)

IR light

Turn On

Figure 3

e. Blue Light With the flashguard shield in the retracted (stored) position, slightly raise the IR filter and rotate it either left/right 90. Then snap it in toward the side of the light to lock it into position. While holding the main body case with either hand, grasp the flashguard shield with the other hand and pull it up until it stops or a slight locking sound is detected, then release. This is an indication that the blue filter has been released and fully engaged to its proper operating position. (See Figure 4)

Blue light

Raise Shield

Turn ON

Figure 4

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SECTION THREE- TESTING AND MAINTENANCE
1. Light Leakage Test With the IR filter in its operation position (See Figure 3), turn the switch ON and observe that no light is transmitted through the sides of the case or the flashguard shield. Turn switch OFF. No light leakage is allowed in the IR mode. If necessary, replace the flashguard shield assembly and repeat the test. If a new flashguard shield fails to remedy the problem, the light is to be condemned and discarded in accordance with local procedures. 2. Flash Rate Test a. Initial A ten minute MANUAL flash rate test is a one-time requirement for all new MS-2000(M) lights received from supply stock. This test is required for initial acceptance of the light and is conducted to insure that the light is capable of sustained operations. Select the white light function (See Figure 2), turn the switch to ON and observe that the strobe lamp flashes. Allow the light to flash for nine (9) minutes, and then manually count the flash rate of the strobe during the final one minute of the test. This rate should be flashes. It is not necessary to directly observe the light flashes during this evaluation. This inspection should be performed in a dark room or enclosure. If any light fails to meet the flash rate requirements, check the batteries and, if necessary, replace both batteries and repeat the test. Additionally, the battery contacts in the battery well should be checked and, if necessary, cleaned with a small brush. Hold vertical while using brush so that any debris falls out of the light. Repeat the test again. If battery replacements or cleaning contacts fail to correct the problem, discard the light in accordance with local procedures. b. Periodic Normally this test is accomplished in conjunction with other life support survival kit/vest test requirements and/or as required by specific MAJCOM directives. This test may be accomplished MANUALLY or AUTOMATICALLY by using the TS-23/A Strobe Light Tester. If the test is to be conducted MANUALLY, follow the test procedures as outlined in paragraph 2a above, except limit the test duration to two (2) minutes. Again, a flash rate of flashes per minute is the acceptable test rate. If using the TS23/A Strobe Light Tester for this inspection, the light can be tested in the TS-23/A with the IR filter in place, by placing the lens/filter over the inspection window on the TS-23 face label and then

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pressing the trap door down to turn the TS-23 "ON", or by removing the flashguard shield and inserting it into the tester. This is accomplished by separating the main body of the light from its flashguard shield. This separation is performed by holding the main body of the light with one hand while grasping the flashguard shield with the other and pulling in opposite directions. After separation, insert the top of the light into the trap door on the top of the TS-23/A, insuring that the xenon lamp is fully inserted into the tester. Turn the light switch ON and note the numerical reading recorded on the digital readout of the tester. An acceptable reading between 100-150 is required and equates to a flash rate of flashes per minute. If a reading of less than 100 is noted, replace both batteries and, if necessary, clean the battery contacts in the light, then repeat the test. Should any light continue to fail this test, discard the light in accordance with local procedures. Upon completion of this test, the reassemble the light by inserting the top of the light (lamp) into the bottom of the flashguard and pushing upward until it stops. NOTE: Standard ambient temperature for performing flash rate test is 70 Fahrenheit. A lower temperature may result in somewhat lower flash rates. c. BA-3058/U battery ("AA" Alkaline) or equivalent Currently only a commercial test fixture exists to test the BA-3058 Radio Shack part number 910-2135 Type 22-096 or equivalent. Therefore, batteries surpassing their lifecycle/manufacturing duration's or batteries that are found to be defective will be discarded in accordance with local disposition instructions/guidelines. 2. Test Equipment and Tools No special test equipment other than the TS-23/A Strobe Light Tester is required to test the MS-2000(M) strobe light. If this tester is not available or functionally inoperative, flash rate testing can be accomplished MANUALLY in accordance with procedures outlined in paragraph 2a except limit the test to two (2) minutes, counting the rate in the last minute. Test equipment for the BA-3058/U battery is commercially available. 3. Maintenance Requirements Since all electronic circuitry of the MS-2000(M) strobe is enclosed within its main body case assembly and cannot be disassembled without destroying its integrity, preventive maintenance requirements are limited to initial and periodic flash rate testing and visual inspections.

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Battery preventive maintenance visual checks will be performed during initial and periodic inspections of the light. 4. Preventive Maintenance Checks WARNING: Do not perform preventive maintenance in a flammable atmosphere or near an open flame. a. MS-2000(M) Distress Marker Light (1) Check that the xenon flash tube lens is not cracked or discolored. (2) Check both the main body and flashguard shield cases for cracks or excessive abrasions. (3) Check for full and free operations of both the IR and Blue light filters. (4) Check that the IR and Blue filters are not cracked and discolored. (5) Check that the light switch moves up and down freely. (6) Check that the battery wells are free of dust and are clean. b. BA-3058/U Battery (or equivalent) 1.5V, AA, Alkaline. (1) Check the battery case for cracks, swelling or leakage. Replace as necessary. (2) (3) CAUTION: Do not mix different battery brands. CAUTION: Do not mix old and new batteries.
(4) CAUTION: Do not mix different battery types, e.g., lithium and alkaine. (5) Replace batteries if device is used on a mission or annually. 5. Alignment No alignment procedures or special inspection requirements must be performed on the MS-2000(M). 6. Periodic Inspection Requirements Normally the MS-2000(M) and associated batteries will be inspected concurrently with other equipment installed in aircraft/ejection seat survival kits, aircrew survival vest or other special requirements. Such inspection intervals will be as specified by respective MAJCOM/agency life support directives. Periodic inspections will include both flash rate and preventative maintenance checks. See previous sections for details. Record inspection dates per MAJCOM/agency procedures and directives.
7. Replacement Parts List (See Figure 1 for additional details) a. Flashguard shield assembly, ACR P/N 4463 b. Battery door assembly, ACR P/N 9338 c. IR Filter, ACR P/N 4459 Item a. comes complete with blue filter, IR filter and labels. Item b. comes complete with retention cable, battery cover screw, door and o-ring. 8. Parts Replacement Procedures a. To replace flashguard Remove the old flashguard by grasping the flashguard with one hand and the light body and lanyard in the other. Pull them sharply away from each other. Then slide the new flashguard in place until it clicks into the locked position. b. To replace the battery door Unscrew the wire cable from the insert in the battery compartment. To install new battery door, screw the cable end through the insert in the battery compartment. The cable is held in place after the threaded cable-end goes all the way through the insert. c. To replace the IR filter Remove the old filter by locking it in the IR position, then slide a 7 level screwdriver between the flashguard case and the IR filter attachment leg twist the screwdriver or pry upward and the leg will pop off of the retainer. Put the replacement filter into place then press with thumb to seat legs over retainers.

APPENDIX A WARRANTY, USEFUL LIFE POLICY, NOTICES

LIMITED WARRANTY

This product is warranted against factory defects in material and workmanship for a period of 1 (one) year* from date of purchase or receipt as a gift. During the warranty period ACR Electronics, Inc. will repair or, at its option, replace the unit at no cost to you for labor, materials and return transportation from ACR. For further assistance, please contact our Technical Service Department at ACR Electronics, Inc.,5757 Ravenswood Road, Fort Lauderdale, FL 33312-6645. Email: service@acrelectronics.com, Fax: +1 (954) 983-5087, Telephone: +1 (954) 9813333. This warranty does not apply if the product has been damaged by accident or misuse, or as a result of service or modification performed by an unauthorized factory. Except as otherwise expressly stated in the previous paragraph, THE COMPANY MAKES NO REPRESENTATION OR WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR ANY OTHER MATTER WITH RESPECT TO THIS PRODUCT. The Company shall not be liable for consequential or special damages. To place the warranty in effect, register online at www.acrelectronics.com or return the attached card within 10 days. *Five years for the following products: EPIRB, PLB, S-VDR, SSAS.

USEFUL LIFE POLICY

The typical service life of a properly maintained Product is limited to 12 years from date of manufacture. Products that are 12 years and 1 month or older from date of manufacture will not be serviced by ACR or our Battery Replacement Centers. A Product that is 12 or less years old from date of manufacture will be serviced as long as the unit appears fit to be placed back into its final operational cycle. Service includes the replacement of those items that must be replaced at service intervals and the verification that the device appears to be in good mechanical and electrical working condition by an ACR authorized service technician.

NOTICES

ACR Electronics diligently works to provide a high quality Product Support Manual, however, despite best efforts, information is subject to change without notice, and omissions and inaccuracies are possible. ACR cannot accept liability for manual contents. To ensure that you have the most recent version of the Product Support Manual, please visit the ACR website at www.acrelectronics.com. 2009 by ACR Electronics, Inc., part of Cobham plc. All rights reserved. Reproduction in whole or in part is permitted only with permission of ACR Electronics, Inc. ___________________________________________________________________ Ongoing product improvements may change product specifications without notice.

Trademarks or registered trademarks are the property of their respective owners.

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YOUR ULTIMATE WAY OUT
The MS-2000(M) Distress Marker Light
Attached Infrared (IR) filter for Night Vision Goggle (NVG) viewing Omnidirectional white strobe emits brilliant 250,000 peak lumens New felt liner on inside of light guard sleeve prevents overt light leakage during IR mode Waterproof factory tested to 10 meters (33 ft) Large sliding Magnetic Reed switch for easy operation under any condition; eliminates water access to internal components
Directional, shielded blue filter alerts friendly forces; identifies strobe from ground fire Improved electronics and silicone conformal coating protect against moisture Raised polarity indicators allow correct battery placement even when visibility is low Battery door attached to case to prevent loss
Since the introduction of the MS-2000(M), it has become the main Combat Search and Rescue (C-SAR) Light carried by elite military forces around the world. Like our highly regarded, reliable SDU-5E, the MS-2000(M) meets all military specifications, including MIL-L-38217D, and CID
Uses commercial off-theshelf AA alkaline batteries; 8 hours continuous operation, minimum
A-A-59176, but it has many improved life-saving features to meet multiple mission capability. Federal Stock Number (FSN) for basic model P/N 3990 is 6230-01-411-8535. Procurement is simple. Call 1-954-9813333 ext. 104. Do it now. There are lives to be saved.
ACR Electronics, Inc., 5757 Ravenswood Road, Fort Lauderdale, FL 33312 USA www.acrelectronics.com
When it comes to saving lives, anything less than the best is not an option.
The MS-2000(M) distress marker light has come a long way since you purchased ACRs original Firefly back in the 1960s. Today, ACR features five distinctive versions of the MS-2000(M) that meet the most up-to-date requirements of the military and fit virtually any application. Here are a few of the new features found in all of our MS-2000(M) models: Shield extends/retracts for omni- or uni-directional visibility IR filter blocks all visible light (lets through only IR light) Raised polarity indicators allow correct battery placement in low or no visibility conditions New braided steel retainer keeps battery door from being lost Operates on 2 standard alkaline AA batteries disposal causes no environmental impact For extreme cold environments or long term storage, use 2 common AA lithium batteries Blue filter distinguishes strobe from ground fire when in place Specifications Product Number: 3990 MS-2000(M)* Product Number: 3991 MS-2000(M) Waterbug (water activated version*) Product Number: 3992 Photofly (photo cell activated version*) Product Number: 3993 Pilotlight (photo cell and water activated version*) Product Number: 3994 Doublefly (strobe and incandescent version*) Size: 4.5 x 2.2 x 1.1 in (11.4 x 5.6 x 3.3 cm) Weight: 4.0 oz (115 g) without batteries Light Output: 250,000 peak lumens per flash Flash Rate: 5010 per minute Light Dispersion: White-omnidirectional, Infrared-omnidirectional, Blue-unidirectional Operating Life: 8 hours minimum strobe; 2 hours minimum incandescent Visibility: Military tested at a distance of 6 miles (9.6 km) on a clear, dark night Batteries: Two AA alkaline or lithium batteries (not included) Case Color: Black with olive drab flash guard Construction: Case, lens and flash guard high impact polycarbonate; IR filter butyrate Activation: Spark proof magnetic reed switch Limited Warranty: One year Federal Stock Number (FSN): Product No. 3990 only: 6230-01-411-8535
White strobe light configuration
With blue filter and directional shield extended, strobe is not mistaken for ground fire
With IR filter in place, strobe visible only with night vision goggles
*Minimum: 5 each (except 3991, 3992, 3993, 3994 call for minimum); Order lead: standard 180 days; Call for availability Slide switch on once Slide switch on 2nd time to activate to activate Doublefly Doublefly strobe incandescent lamp
ACR Electronics, Inc., 5757 Ravenswood Road, Fort Lauderdale, FL 33312 USA www.acrelectronics.com Telephone: +1 (954) 981-3333; (800) 432-0227; Fax: +1 (954) 983-5087