NavAlert 2 Installation Manual Rev E October 24, 2000

Installation Notes For Icarus NavAlert 2 Rev E October 24, 2000

Introduction The NavAlert 2 is an instrument for displaying various navigation and altitude data to the pilot. The surface-mounted display normally mounts between the HSI and the attitude indicator, but may be mounted directly on top of the lowest portion of some Bendix/King attitude indicators/flight directors. The display has two, four-character bright LED displays and is connected to the processor unit via three wires. The display is the exact width of the Bendix/King HSI plus a little dog house for the wires that go through the panel. When used with Bendix/King indicators, the existing mounting holes are used to mount the NavAlert Display. Installation Approval See section at the end of this document regarding installation approvals. Sample 337 is included. Control Switch There is also a panel mounted control switch and knob which requires five wires back to the processor unit. The maximum diameter of the switch is 1”. It comes with the mating connector with five attached 4 foot long wires ready to be connected to the DB-25 on the processor unit. The switch requires a 3/8” hole and is supplied with a black knob. Surface Mounted Display The display is 3.56" wide plus an additional 0.27" for the doghouse to accommodate the wires through the panel. It is 0.6" high and 0.50" deep. Remove the front of the display first to gain access to the mounting plate. Attach the mounting plate to the panel using two #6 screws. If the display is mounted on top of a King HSI or AI, use the existing instrument mounting

holes and screws to attach for the backplate and drill a hole to pass the wires through the doghouse. See install drawing for mounting dimensions. Drill a hole in the panel to pass the "dog house" that carries the wires. The wires must be put through the dog house and panel individually and then installed in the black mating connector so that the colors line up with the supplied cable that goes to the processor unit. Remove the small black Berg connector, insert the three male pins until they seat and re-install the connector into the mating housing. Be sure that the colors line up with the supplied harness. Processor mounting The processor unit is a small aluminum box that has mounting flanges at each end. The overall size is 7" long by 2.5" wide by 1’ high. See install drawing for mounting dimensions. Model NA2000-1 features The NavAlert 2 model NA2000-1 includes all of the GPS functions which include ground speed, ground track, time to waypoint, distance to waypoint, waypoint ID, track error, GPS CDI 1.0 nm, and GPS CDI 0.3 nm. The basic model also includes an altitude alerter feature with an altitude serializer for driving GPS receivers and transponders that have serial input. To utilize the alerter/serializer feature, the Mode C code lines must be connected to the processor module on either of the DB-15 connectors. Model NA2000-3 Features The NavAlert 2 model NA2000-3 adds the ability to display analog nav signals including CDI, GS, and To/From. The nav flag and glide slope flag are also required and will blank the respective display. This analog nav indicator is ideal as a backup for Sandel 3308 installations. While designed primarily as a LOC/GS ILS backup for the Sandel 3308, the analog input feature requires a source of OBS course information if used in the VOR mode. The Sandel 3308 can provide this OBS information even if the display bulb fails. In other words, the NavAlert 2 cannot be used as a standalone VOR CDI due to the lack of an OBS resolver.

Encoder Connections/Serializer The processor box has three connectors, a DB15 male, DB-15 female, and a DB-25 female. The two DB-15 connectors are wired in parallel and are used for the Mode C connections if the altitude alerter/serializer feature is desired. Power for the NavAlert 2 is also supplied on pins 8 or 14 of either of these DB-15 connectors with ground on pin 15. Either 14 or 28 volts may be applied to pins 8 or 14. An external 1.0 amp CB or fuse must be used to protect the unit. The DB-15 connectors have the "standard" Trans-Cal pinout for the Mode C wires and are wired like the Icarus 3000U serializer. Pin 6 (encoder common) is simply wired through the two DB-15’s as are all of the code lines. If the Mode C wires are not connected, the altitude alert function, gear alert, and the serializer functions will not work. Basic Installation (no Mode C) A very basic installation requires that only power, ground, audio, and the GPS map output be connected plus the display and the control switch wires. It is recommended that the audio output always be connected so that GPS and altitude alerts are heard by the pilot. This output generally goes to an unswitched input on the aircraft’s audio panel. Note that the audio ground return is required. This audio ground is NOT a logic ground and must be connected to ground at the audio panel itself. There is no provision for a Sonalert audio annunciator. If the altitude encoder signals are not connected, the altitude alert function, gear alert, and the serializer functions will not work, but all GPS function will function. The DB-25 is used for all connections except power and the Mode C code lines. These include the following: Single wire to GPS RS-232 moving map output. Two wires to unswitched audio input on audio panel (includes ground) Serial altitude output to GPS receivers (except Bendix/King models) NavAlert 2 switch (five wires) NavAlert 2 display (three wires)

Optional VOR/LOC/GS connections Optional connections on DB-25 with NA2000-3 model: Backup analog Nav indicator inputs from Nav or GPS receiver including CDI, GS, Nav flag, GS flag, and To/From. These may be connected to the primary GPS/Nav signals on a Garmin 430/530. These are the same signals that an HSI would be wired to. If the HSI is switched between a separate GPS and a Nav receiver, these NavAlert 2 inputs can be wired to the output of the relay (HSI side). Or the NavAlert 2 can be directly wired to the VOR/LOC/GS receiver directly if only that receiver’s CDI/GS is to be displayed on the NavAlert 2. The VOR/LOC/GS display is primarily designed to be the backup for a Sandel 3308 or other EFIS display. Complete Pinouts of the DB-25 connector GPS signals: pin 4 GPS RS-232 input (See note 1 below) pin 20 Audio out (600 ohm) to audio panel unswitched input pin 8 Audio ground (must be connected to audio ground (not logic ground) pin 5 digital ground for RS-232 GPS input/serializer output Serializer signal: pin 16 Serializer output RS-232 in Garmin, UPS Apollo, Northstar, or Trimble, format. Use pin 5 for ground (settable for baud rate and format) Switch signals: (use supplied cable) pin 18(GND) to pin 1 on switch pin 15 (PB) to pin 3 on switch pin 2 (A) pin 4 on switch pin 14 (B) to pin 5 on switch pin 17 (+5) to pin 6 on switch

Display signals: (connect display wires to supplied cable, match colors) pin 1 (+5) Red wire on display pin 3 (GND) Black wire on display pin 6 (RS-232 out) gray wire on display NA2000-3 model only, analog nav signals: VOR/LOC/GS signals from Nav receiver (normally at HSI): pin 21 LOC Right pin 9 LOC Left pin 22 GS Up pin 10 GS Down pin 23 To pin 11 From pin 24 Navflg+ pin 12 Navflg- pin 25 GSflg+ pin 13 GSflg- DB-15M and DB-15F Pinouts (these connectors are wired in parallel) Pin Signal 1 D4 If encoder does not go above 30,700 feet, leave this pin open 2 A1 3 A2 4 A4 5 B1 6 Encoder common (wired through) 7 AUX (wired through, usually not used) 8 Power input 14/28 VDC at 125 ma must be fused or protected with

circuit breaker and go to avionics bus, not master bus. Use pin 8 or 14 for power input

9 B2 10 B4 11 C1

12 C4 this is correct despite illogical order 13 C2 this is correct despite illogical order 14 Power input 14/28 volts DC (must be fused or CB protected) use

either pin 8 or 14 for power input 15 To aircraft ground The NavAlert 2 will not work with transponders using a pulsed strobe line. Most modern transponders do not use a pulsed strobe. The NavAlert 2 must "see" Mode C data at all times. Note 1 The moving map output from any IFR approved GPS receiver will drive the NavAlert as well as the output from most VFR panel mounted GPS receivers. If the Northstar M-3 (or any other Northstar receiver) is used to drive the NavAlert 2, an Icarus Northstar Protocol Adaptor is required. This is housed in a very small potted module and simply wires into the DB-25 connector on the processor module of the NavAlert 2. It is fed with the binary M-3 map data which is translated by the converter module to the standard ASCII data stream. The power for the module is provided by the NavAlert 2 processor module. The adapter is supplied with captive cables for interconnections to the NavAlert 2 and the M-3. The adapter carries part number NA-2000-NPA. Display Mechanical Dimensions: The center to center distance for the mounting slots in the mounting plate is 3.156". Use #6 screws to mount mounting plate. The dimension from the left mounting slot C/L to the C/L of the doghouse hole is 0.347"

The doghouse is on the center line of the mounting plate and has a diameter of 0.260". Make a slightly larger hole in the panel if the doghouse is to project into the panel. The through hole in the doghouse is 0.150" dia. Processor Module Mechanical Dimensions: Mounting Flange hole spacing: 2.0” #6 holes Mounting holes center to center (long dimension) 6.41” Configuring The NavAlert 2 The NavAlert 2 can be used as a source of serial altitude information for Garmin, Apollo, Trimble, and Northstar GPS receivers by using the internal altitude serializer. The serializer function must be configured to match the format of the respective receiver. See Appendix B of the owners manual on how to set these parameters. There are also parameters relating to the GEAR alert that you may want to pre-configure for your customers described in this Appendix. The GEAR alert is defaulted to OFF at the factory. Always leave the baud rate (GPSB) parameter at 9600 for the GPS map data input to the NavAlert. Testing the installation Refer to the POH for details on initializing the NavAlert 2. Once initialized, go to the SEL> mode and display the aircraft’s mode C altitude to verify proper wiring and functions of the mode C circuits. The altitude will have an “A” as the first character. Be sure to enter the baro setting in order to view the field elevation correctly. The encoder must be warmed up and the transponder must be on.. Then turn on the GPS receiver and verify that using SEL>, you can see the selected GPS parameters. Note that some GPS receivers will not put data on the RS-232 moving map output unless there is some minimal ground speed. Garmin receivers must “see” 5 kts before they will output useful information.

The analog nav signals are tested by using SEL> to select the LOC/GS display which has a horizontal bar in the middle of the two center characters. Drive these signals with an appropriate RF signal generator to the appropriate nav reciver. The aircraft’s primary LOC/GS display should match the NavAlert 2’s display. Disable the GS signal and generate a VOR signal to test the To/From flag. Use the primary OBS knob to flip the To/From flag. If the Nav flag is dropped (inop), only two horizontal bars will be displayed. Icarus Instruments, Inc. 7000 Carroll Ave. Suite 200 Takoma Park, Maryland 20912 USA info@www.icarusinstruments.com 301 891 0600 301 891 0666 fax