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9/27/01 AC 43.13-1B CHG 1 the ELT. A TSO-C91 ELT can be activated by using a quick rap with the palm. A TSO-C91a ELT can be activated by using a rapid forward (throwing) motion coupled by a rapid revers ing action. Verify that the ELT can be acti vated using a watt meter, the airplane’s VHF radio communications receiver tuned to 121.5 MHz, or other means (see NOTE 1). Insure that the “G” switch has been reset if ap plicable. d. For a Sufficient Signal Radiated From its Antenna. Activate the ELT using the ON or ELT TEST switch. A low-quality AM broadcast radio receiver should be used to determine if energy is being transmitted from the antenna. When the antenna of the AM broadcast radio receiver (tuning dial on any setting) is held about 6 inches from the acti vated ELT antenna, the ELT aural tone will be heard (see NOTE 2 and 3). e. Verify that All Switches are Properly Labeled and Positioned. f. Record the Inspection. Record the in spection in the aircraft maintenance records according to 14 CFR part 43, section 43.9. We suggest the following: I inspected the Make/Model ______________ ELT system in this aircraft according to appli cable Aircraft and ELT manufacturer’s in structions and applicable FAA guidance and found that it meets the requirements of sec tion 91.207(d). NOTE 2: This is not a measured check; but it does provide confidence that the antenna is radiating with suf- ficient power to aid search and rescue. The signal may be weak even if it is picked up by an aircraft VHF receiver located at a considerable distance from the radiating ELT. Therefore, this check does not check the integrity of the ELT system or provide the same level of confidence as does the AM ra- dio check. NOTE 3: Because the ELT radiates on the emergency frequency, the Fed- eral Communications Commission al- lows these tests only to be conducted within the first five minutes after any hour and is limited in three sweeps of the transmitter audio modulation. 12-23. FLIGHT DATA RECORDER. The flight data recorder is housed in a crush-proof container located near the tail section of the aircraft. The tape unit is fire resistant, and contains a radio transmitter to help crash in vestigators locate the unit under water. In- spection/Operational checks include: a. Check special sticker on front of the flight data recorder for the date of the next tape replacement, if applicable. b. Remove recorder magazine and in spect tape for the following: (1) broken or torn tape, (2) proper feed of tape, and (3) all scribes were recording properly for approximately the last hour of flight. c. Conditions for tape replacement (as applicable): Signed: Certificate No. Date: ______________________ ______________________ ______________________ NOTE 1: This is not a measured check; it only indicates that the G-switch is working. Par 12-22 Page 12-9PDF Image | AFS-640
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