Narco Avionics MK12D TSO Manual de usuario
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
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 DATE REV PAGE DATE REV PAGE DATE REV PAGE DATE REV PAGE DATE REV
3 10-96 D
5 10-96 D
5 09-98 E
6 09-98 E
8 06-99 F
9 06-99 F
JUNE 1999
REV. F
OCTOBER 1996
REV. D
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 ).
•Bright sunlight readable display.
•Flip-Flop frequency entry.
•Direct slide in replacement for the MK12, MK12A, MK12B.
•14v or 28v units available.
COM
•760channel TSO'd VHF transceiver.
•7 watts nominal transmit power ( 10W typical ).
•0.003% frequency stability.
•Automatic squelch with manual override.
•50mw phones output.
•10 watt audio amplifier.
NAV
•200 channel TSO'd NAV receiver.
•Glideslope channeling ( 2 of 5 or Narco 11 wire ).
•DME channeling
2.0 INSTALLATION
2.1 INTRODUCTION
The MK-12DR is a direct replacement for the MK12, MK12A, MK12B NAV/COM
units. It's specifications meet or exceed those of the unit it is replacing.
2.2 TECHNICAL SPECIFICATION AND PERFORMANCE ADJUSTMENTS
The MK-12DR is a specially modified MK-12D Cessna unit. The mechanical
modifications effect the physical size, latching method, and interconnections. The
electrical modifications concern the NAV receiver ( level and phase ), deleting the
vor and Localizer converters, and adding selectable Glideslope channeling ( 2 of 5 or
Narco 11 wire ). All pertinent adjustment information can be found in the MK-12D
TSO maintenance manual ( P/N 03118-620, December 1988 or later )
2.2.1 SPECIFICATION DIFFERENCES
WEIGHT: 5.8 lbs.
14V- Receive current:1.0 amps Transmit current: 4.3 amps
28V- Receive current:0.5 amps Transmit current: 2.5 amps
NAV receiver output level ( VOR): 3.0V rms
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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.
NAV Receiver
The NAV receiver of the MK-12DR is designed to meet VOR TSO C40b and
Localizer TSO C36c- Class C. The MK-12DR when replacing a MK12,
MK12A, or MK12B will typically be used with one of the VOA series
indicator/converters. The following table lists these units and their TSO's if
applicable.
INDICATOR/CONVERTER TSO
VOA-4,VOA-5 NONE
VOA-8,VOA-9 C36b- CLASS c, C40a
VOA-40,VOA-50 NONE
The wiring and antenna pertaining to the NAV receiver should be inspected to insure TSO
compliance.
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. For these installation it is recommended that the installation be
modified according to figure 2-1.
Warning! Failure to comply with this section will cause damage to one or both
units.
FIG. 2-1
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SEPTEMBER 1998
REV. E
6
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). Before
installing the MK-12DR all existing cables and connectors should be inspected and
cleaned. To install the MK-12DR route the cables the same as before and connect the
antenna cables to the back of the unit. The MK-12DR should then be secured with
either the rear latching screw. If replacing an MK12B a rear quater turn latching
screw must be used. These should be available at most shops. If DME or Glideslope
channeling is needed refer to section 2.7 for instructions. For ease of removal the
MK-12DR has a convenient handle that is released with a phillips head screw. The
existing power unit is not needed and can be removed, the included adapter plug must
be installed at the end of the power unit cable ( black wire to airframe ground ) Fig 2-
7.
Warning! Failure to remove the power unit will do severe damage to the
MK12D/R.
2.7 KEEP ALIVE AND REMOTE CHANNELING ( P5 )
Keep alive is no longer needed on the newer versions of the MK12D/R. Reference to
keep alive on P5 is kept to be consistant with earlier versions. For installations
requiring Glideslope and/or DME channeling table 2-1 list the pin connections on P5.
To enable 2 of 5 Glideslope channeling pin 8 should be connected to ground. The
original Glideslope and DME channeling cables should be cut off the MK12(A/B)
and wired to P5 using a DB37 female connector ( supplied ). Refer to figures 2-2, and
2-3 for these channeling connections.
PIN # FUNCTION PIN # FUNCTION
1 108.1/110.1, A-MHZ 20 109.1/111.1, A-KHZ
2 108.3/110.3, B-MHZ 21 109.3/111.3, B-KHZ
3 108.5/110.5, C-MHZ 22 109.5/111.5, C-KHZ
4 108.7/110.7, D-MHZ 23 109.7/111.7, D-KHZ
5 108.9/110.9, E-MHZ 24 109.9/111.9, E-KHZ
6 G.S. ACTIVATE 25 50 KHZ
7 A/B 26 GROUND
8 2/5 ENABLE 27 ARINC
9 28
10 29 KEEP ALIVE
11 30
12 SWITCHED A+ 31 GROUND
13 32 50 KHZ
14 33 NARCO 'L', E-KHZ
15 NARCO 'A', E-MHZ 34 NARCO 'K', D-KHZ
16 NARCO 'E', D-MHZ 35 NARCO 'J', C-KHZ
17 NARCO 'D', C-MHZ 36 NARCO 'H', B-KHZ
18 NARCO 'C', B-MHZ 37 NARCO 'F', A-KHZ
19 NARCO 'B', A-MHZ
TABLE 2-1
P-5 FUNCTIONS
FIG 2-2 GLIDESLOPE CHANNELING
FIG 2-3 DME CHANNELING
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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. 2-4
2.8.1 PIPER SPECIAL
There were a number of MK12s manufactured as Piper specials. Refer to Figure 2-5
to see the rear panel of a Piper special. Figure 2-7 lists what the connections of P301
were and the appropriate connections on the MK12D/R. A mating connector for
P301 of the MKD/R would have to be found to complete the installation.
Fig. 2-5
T-102
J-101
T-101
P-101
P-301
J-301
JUNE 1999
REV. F
8
JUNE 1999
REV. F
9
P101 P301
1 GROUND 1 GROUND
2 MIKE AUDIO GND. 2 SWITCHED A+
3 NC 3 NC
4 NC 4 VOR/LOC CONTROL
5 14V OR 28V INPUT 5 DIMMER
6 MIKE KEY 6 VOR/LOC SIGNAL
7 MIKE AUDIO
8 SPEAKER OUT
9 NC
10 DIMMER INPUT
11 NC
12 AUX AUDIO IN
13 PHONES OUT
14 NC
15 NC
16 NC
P501 JUMPER PLUG CONNECTIONS
PIN PIN
3 7
4 6
5 12
8 16
11 13
FIG. 2-6
MK12D/R MK12
P5 J301
1 A 18.01 110.1
6 B GLIDESCOPE ACTIVATE
24 C 109.9 111.9
2 D 108.3 110.3
7 E 10/20 A-B BANK CONTROL CANNEL CONTROL
23 F 109.7 111.7
3 H 108.5 110.5
25 J N.C. 50 KHz 46 RZA/UGRS
22 K 109.5 111.5
4 L 108.7 110.7
TO AIRCRAFT GROUND M GROUND
21 N 109.3 111.3
5 P 108.9 110.9
20 R 109.1 111.1
P301
1 S OMNI/LOC GROUND
T N.C.
6 U OMNI/LOC SIGNAL
4 V OMNI/LOC CONTROL
Fig. 2-7
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. The display's Standby frequencies will always be the
factory pre-programmed frequencies of 121.90 for COM Standby and 110.50 for
NAV Standby.
FIGURE 2-6 MK-12DR FRONT PANEL
2.9.1 COM Section Operation
COM: DISPLAY
The left side of the display identifies the COM Active COMmunications frequency,
and the letter "T" (when lit) to indicate that the Mike Key is depressed and the Unit is
transmitting.
The right side of the display identifies the COM Standby frequency.
COM: OFF-VOL-PULL TEST
OFF is the maximum counterclockwise rotation of this control. Clockwise rotation
past the "click" turns both the COM and NAV Sections ON.
VOL, once the Unit is turned ON, continued clockwise rotation increases the COM
audio volume.
NOTE: NAV AND COM SHARE THE AUDIO 50 mw OUTPUT.
PULL TEST when pulled deactivates the squelch circuit.
JUNE 1996 REV. C
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