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Summary of Contents for Narco Avionics MK12D TSO
- Page 1 NARCO AVIONICS MK12D TSO (MK12, MK12A, MK12B REPLACEMENT RADIO) ADDENDUM INSTALLATION MANUAL 03118-0620R NARCO AVIONICS INC. 270 COMMERCE DRIVE FT. WASHINGTON, PA. 19034 U.S.A. PRINTED IN U.S.A. JUNE, 1999...
- Page 2 NARCO AVIONICS INC. MK12D/R INSTALLATION MANUAL REVISION HISTORY This page is provided and updated as necessary as a means of identifying pages that were changed at each revision level. The affected page number, the revision level, and the date of the change are listed. Additionally the date and revision level is changed on the bottom of the affected pages.
- Page 3 1.0 INTRODUCTION 1.1 DESCRIPTION The MK-12D TSO ( replacement radio ) referred to here on as MK-12DR, is a modified version of the MK12D Cessna replacement radio. The MK-12DR is a direct replacement for the NARCO MK12, MK12A, and MK12B NAV/COMS. 1.2 FEATURES GENERAL Active channel keep alive ( when connected ).
- Page 4 2.3 UNIT PART NUMBERS MK-12DR (14V) 03118-0334 MK-12DR (28V) 03118-0336 2.4 TSO CONSIDERATIONS COM Transceiver The COM section of the MK-12DR is designed to meet TSO's C37b-Class IV, and C38b - Class C. The existing installation into which the MK-12DR is going to be installed must be inspected to insure that the wiring and antenna meet the appropriate TSO, otherwise the TSO will not be valid.
- Page 5 2.5 PARALLEL AUDIO INSTALLATIONS In some dual installations ( usually without audio panel) the speaker outputs of the two NAV/COMs were wired in parallel. The MK12DR TSO has a solid state speaker amplifier for improved audio response and reliability and this type amplifier cannot be paralleled.
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Page 6: Removal And Installation
2.6 REMOVAL AND INSTALLATION The existing MK12 or MK12A can be removed by first disconnecting all cables and then releasing the locking screw at the rear of the unit. The MK12B's have a front mounted cam lock that can be released by removing the snap in button on the trim panel and using a screw driver to release the radio ( some MK12B's may be installed in MK12 or MK12A trays and they would use the rear locking screw). - Page 7 FIG 2-2 GLIDESLOPE CHANNELING FIG 2-3 DME CHANNELING JUNE 1996 REV. C...
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Page 8: External Connections
2.8 EXTERNAL CONNECTIONS Figure 2-4 shows the locations of cables, connectors and antenna inputs of the MK- 12DR. Figure 2-5 shows the pinouts of the 16 pin and 6 pin connectors attached to the MK-12DR and the 16 pin jumper plug. Fig. - Page 9 P101 P301 GROUND GROUND MIKE AUDIO GND. SWITCHED A+ VOR/LOC CONTROL 14V OR 28V INPUT DIMMER MIKE KEY VOR/LOC SIGNAL MIKE AUDIO SPEAKER OUT DIMMER INPUT AUX AUDIO IN PHONES OUT P501 JUMPER PLUG CONNECTIONS FIG. 2-6 MK12D/R MK12 J301 18.01 110.1 GLIDESCOPE...
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Page 10: Operation
2.9 OPERATION This operation procedure presumes that the MK-12DR has been installed with the Keep-Alive option The Keep-Alive option maintains the last set COM and NAV Active frequencies in their memory IC's. When the Unit is turned ON, these "active" frequencies will be seen in the Active displays. -
Page 11: Nav: Display
COM: MHz/KHz CHANNEL SELECT KNOBS Both these controls allow for continuous CW or CCW rotation. MHz frequency readout, in Standby display, changes at a rate of 1 MHz per detent. Rotation of the KHz knob steps the Standby frequency readout at a change rate of 25 KHz per detent. Clockwise rotation increments the frequency, counterclockwise decrements the frequency. - Page 12 NAV: HOW TO ENTER A FREQUENCY All frequencies entered into the NAV Section enter via the Standby route, that is, the frequency is entered (seen in the Standby displays) and then transferred to the Active by depressing the "arrowed" transfer push button. The next frequency entered is the Standby frequency.
- Page 13 Should it appear that in changing frequency you lost count, you may rely on the factory pre- programmed frequency of 110.50 in the Standby memory. However, you must turn the MK- 12DR OFF, then ON, to automatically set 110.50 into the Standby display. (Active frequency being Kept-Alive, will not be affected by the turning OFF and ON of the Unit.) Now channel to the desired frequency using the detent-by-detent count off method.
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Page 14: Post Installation Tests
If wrong, transfer your original COM frequency back to Active, then repeat the turn OFF, turn ON, and the detent-by-detent channel selection. 2.10 POST INSTALLATION TESTS This operation procedure presumes that the MK-12DR has been installed with the Keep-Alive option. All references to figures for adjustments refer to figures in the MK-12D maintenance manual. - Page 15 2.10.1 NAV Preflight Tests For this series of in-aircraft tests, the aircraft's engine(s), rotating beacon, electrical and avionics equipments should be operating. Note any abnormal interaction of interference (ignition or rotating beacon noise, abnormal meter deflection, compass deviation, etc.) observed during these tests. The following procedure requires a ramp type piece of test equipment such as that offered by Tel-Instrument Corp.
- Page 16 Check the remaining three cardinal points (90, 180, and 270).The Left-Right needle should center within ±2.0 degrees ( ±1.5 degrees for TSO'd indicator) with a TO flag. With OBS remaining at 270, set test equipment to 90.The Left-Right needle should center within ±2.0 degrees ( ±1.5 degrees for TSO'd indicator) with a FROM flag.
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Page 17: Flight Test
During this exercise make a panel illumination check: COM READOUT SEGMENTS AND TRANSFER CHECK - Set 120.20 Active - 136.95 Standby, push arrowed white transfer button. If complete frequencies were seen in both positions - all segments are OK. (Transfer button does not illuminate.) TRANSMIT - "T"... - Page 18 Flying at an altitude of 6000 feet AGL, channel the NAV Active to a VOR facility 10 NM away and fly inbound. Check course width . Observe the VOR warning flag while approaching, passing over, and flying outbound: TO/FROM indicator shall indicate correctly and the warning flag must be out of view except when passing directly over the station.
- Page 19 JUNE 1996 REV. C...
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