User manual ACR ELECTRONICS ELT-202 EMERGENCY LOCATOR TRANSMITTER

[. . . ] Unlike other types of ELT's, the ELT (S) is intended to be removed from the aircraft and to travel with survivors. The ELT-202 may be installed within life rafts or slide/rafts or mounted in the aircraft cabin on flightdeck. The ELT-202 is activated by placing the unit in water. The unit is completely waterproof and floats upright when deployed. [. . . ] Testing outside of a shielded room may only be performed during the first five minutes of each hour, and then only for a maximum duration of three audio sweeps (equivalent to one flash of the red indicator light). 2) The ELT possesses a self-test feature, which monitors the signal at the antenna terminal. The red indicator light will flash only if the proper signal is detected. 3) An ELT should always be self-tested prior to the initial installation (see section 5. 2). Periodic testing is recommended to help assure that the ELT will function optimally and reliably in an emergency. 4) An ELT should always be shop tested prior to reinstallation (see section 5. 3). 5. 2 Operational Test - Self Test Test Equipment Required: 1) 12 volts power supply. 2) RF screen room or test within the first 5 minutes of each hour (see section 5. 1, note 1) 6 Y1-03-0090-2 Rev. D Test Procedure 1) Place the ELT in a secure screen room to prevent radiation of signals on emergency frequencies. 2) Apply 12 volts DC (from a power supply or external battery) to the test terminals at the bottom of the unit. CAUTION: Do not attempt to test the ELT by immersing it in water. Once activated, the internal battery will discharge and cannot be reused. 3) Check to see that red indicator is flashing approximately once per second. 4) The ELT is functional only if the red indicator light flashes without interruption. 5) If the conditions specified in step 4) are not met, return the unit to ACR 5. 3 Operational Test - Shop Test Equipment Required: 1) Spectrum Analyzer, IFR A-7550 or equivalent. Total length of 7. 00 inches including connector circular by 11/16 inch in diameter. 3) Aluminum Ground Plane 12 inches in diameter by 1/16 inch thick. 4) BNC female to BNC female UG-492 B/U feed through adapter to elevate top of monopole antenna to 7 3/16 inches above ground plane. 5) 13 foot long 50-Ohm RG 58 A/U coaxial cable (0. 9 dB loss at 121. 5 MHz and 1. 3 dB loss at 243 MHz) with BNC male connectors. 6) Test Fixture ACR #T2-01-0016 shown in Figure 3. Connect 12-volt power supply to the fixture banana jacks. 9) Spectrum Analyzer settings: Horizontal Sensitivity 20 MHz / Div Center Frequency 180 MHz Vertical Sensitivity 10 dB / Div Resolution Bandwidth 3 MHz Reference Level 0 dBm 7 Y1-03-0090-2 Rev. [. . . ] Check the bottom contacts for corrosion or other damage. 6) If any physical damage is observed, have the unit inspected at ACR. 6. 3 Factory Inspection and Test The ELT must be returned to ACR every 5 years for a complete factory inspection and battery recertification. (The 5 year interval is controlled by the expiration date of the battery). The factory inspection and test will include a full functional test, a battery test, and a visual inspection of the case, antenna and lanyard. [. . . ]