iTac Manual - v1.0 - Aircraft Spruce

iTac – Intelligent Tachometer Page 1 of 32

All specification subject to change

© 2005 Aerospace Logic Inc.

iTac - Operations and Installation Manual

This manual is certified for use with instrument serial number

ASL000000

Use of this manual with any other

instrument voids all warranties and may result in damage to the instrument


THIS PAGE INTENTIONALLY LEFT BLANK


SECTION 1 Introduction

READING THIS MAUNAL IS THE FASTEST WAY TO INSTALL AND START USING YOUR NEW INSTRUMENT!

This manual has been prepared in a logical sequence to facilitate the simplest and most efficient method to install and start using your instrument. By following the instructions on the following pages you can be assured of a successful install within the times specified. Installation times will vary depending on aircraft type and the current state of the aircraft. It will generally take a little longer to install the instrument if this is the only task being performed vs. in conjunction with other maintenance and / or repairs.

The general time estimate for the installation of this instrument, by licensed maintenance personnel is two hours.

Technical support for any aspects of this instrument is available 24 hours a day 7 days a week on our online support forum located at:

www.aerospacelogic.com/forum/

Telephone support is available, Monday through Friday from 9:00 a.m. to 5:00 p.m. Eastern Standard Time at:

416-628-0725


NO NONSENSE WARRANTY

Our warranty policy is simple …. It is even written in plain English!

Please read it BEFORE DOING ANYTHING WITH YOUR NEW INSTRUMENT! We will:

• Repair or replace (at our discretion) any instrument which becomes defective within a period of 12 (twelve) months of manufacture date. You will pay for the shipping costs to return the instrument to us and we will pay for the shipping costs to return the instrument to you;

• Replace all instruments that fail out of warranty for a flat rate of 50% of the cost

of a new instrument, at the time of the failure. We are not:

• Liable for any costs associated with the installation or removal of any of our instruments, irrespective of the cause;

• Liable for any misuse or non-use of the instrument in whatever form.

We will not:

• Repair or replace your instrument free of charge, under warranty, if it has not been installed by an appropriately licensed person.

If you do not agree with ANY of the above statements, return your new instrument to us immediately for a FULL refund LESS

shipping costs.

ALL RETURNS REQUIRE RETURN MATERIAL AUHORIZATIONS (RMA). WE DO NOT ACCEPT RETURNS WITHOUT AN RMA

NUMBER. CALL 416-628-0725 FOR AUTHORIZATION.


SECTION 2 Installation

INSTALLATION STEP 1 – Instrument Physical

1. Choose an appropriate location on your aircraft panel for the installation of the instrument. The iTac will fit any standard 2 ¼” aircraft mounting hole. Ensure easy and clear access to the instrument.

2. Keep in mind wiring lengths. a. The instrument is supplied with 4’ wiring for power and external functions

and 9’ of wiring for the magneto sender. Any of these wires may be lengthened or shortened without effect on the operation of the instrument.

b. The magneto p-lead signal cables are 4’ in length. These MAY NOT be lengthened or shortened. Custom length p-leads are available on request.

3. Now install your instrument in your panel. Place the instrument in the hole from the rear of the panel and then attach it with the four screws provided. If you need to replace the screws, ensure that the threads do not penetrate the instrument more than ½”. Screws that penetrate the instrument further will cause severe damage to the instrument.

INSTALLATION STEP 2 – Hall Effect Magneto Sensor The Hall Effect Magneto Sensor may be installed on either magneto, but should not be installed on magnetos that have either a start vibrator or “shower of sparks” system associated with them. Many different magneto configurations exist but the underlying installation principle is the same. In all cases the sensor must be installed in the magnet rotation field of the magneto. On some magnetos two possible install locations will be visible. The location within the magneto magnet field must be chosen. Proceed as follows:

Remove vent cover, if installed

Remove vent plug

Magneto ready for sensor

installation


Install the sensor into the magneto. DO NOT OVER TIGHTEN!

Route the wiring from the sensor as follows:

• Away from all heated and/or moving parts • Allow a sufficient wiring loop before securing the wire bundle that will account for

engine movement between the sensor and the first attach point • If the sensor is installed on the top of the magneto route the sensor wiring

towards to bottom of the magneto to prevent any moisture and/or liquid buildup that could enter the magneto

• Through the firewall, ready for connection to the instrument INSTALLATION STEP 3 - Wiring The iTac is an electronic device. It has been designed to withstand normal static charges both during installation and operation, installing it in the following sequence will reduce the possibility of damage. Ensure power to the aircraft is turned off before continuing. Now connect the primary wiring as follows:

1. Connect the BLACK wire from the instrument to an appropriate ground point.

2. Connect the RED wire to the switched supply point (i.e master switched bus or similar). The instrument is internally fused for protection. However it should still be connected through an appropriate circuit breaker to allow it to be disabled should this be required for any reason.

3. Connect the YELLOW wire to a permanent supply point (14v or 28v). This line

must have supply at all times. Some possible connection points are: before the master switch, supply line to the oil pressure switch that powers the hobbs meter or direct battery connection.

4. If you wish to control the intensity of the instrument display using either the panel

rheostat or an external potentiometer connect EITHER the BLUE (28V) or the WHITE (14V) wire to the variable output of this device. If you prefer to use the internal intensity control then connection of either these wires is not required.


5. The instrument provides an external annunciator control output. This output is capable of sinking a DC load of 150mA. An inductive load (such as a relay) may be connected to this output without any further protective components (back EMF protection is included in the instrument). Exceeding a 150mA sink current will permanently damage your instrument. The supply voltage of your annunciator device may not exceed the supply voltage of your aircraft DC system. Connect the ORANGE wire to your external device if this is required.

If you intend to use any of the data download features then see Section 4 for connection of the ORANGE, YELLOW and BLACK wire bundle. If you do not intend to use any of these features then leave these wires unconnected. Connect the Hall Effect magneto sensor wires (the RED, WHITE and BLUE twisted wire bundle) to the sender in the following order:

1. WHITE 2. RED 3. BLUE

Finally connect the p-lead sensor wires DIRECTLY TO THE IGNITION SWITCH. Neither the existing p-leads nor the p-lead sensor leads should be cut under any circumstances. Ensure that the p-lead sensor leads from the instrument are not attached to any other aircraft wiring. They should be routed away from all electrical devices wherever possible. While these leads are shielded to protect from radiated noise, keeping them away from other electrical devices and/or wiring will ensure that no magneto noise is induced into these devices. Where there is no option but to traverse existing wiring, ensure that the p-lead signal wiring crosses this wiring at 90º angles wherever possible. Connect the p-lead signal lead with the RED tag to the right magneto p-lead and the p-lead signal lead without a color tag to the right magneto p-lead. Your instrument is now ready for operation. Turn on the power to the instrument and confirm that the display is enabled. If the display does not turn on, check the wiring as above and confirm that power is supplied to the instrument. If the instrument does turn on proceed with the initial setup on the next page.


SECTION 3 Setup

Complete instrument setup is required at the time of installation. With the exception of the engine time (which may only be set once) all parameters can be changed at any time. Engine time may only be reset by returning the instrument to the factory or remotely by connecting your instrument to the Internet. Instructions for this procedure are not provided as part of this document and are provided as and when needed. The F (Function) and S (Set/Select) switch positions are used for all setting functions. STEP 1 - Activation

To enter the setup mode turn off the power to the instrument. Hold the switch in the F position and turn on the power. Once the instrument display is as shown, release the switch. As soon as the switch is released the instrument display will change and display the software version of the instrument. This will only appear for a few seconds before permitting access to the setup options.

STEP 2 - Overview There are five basic sections accessible within the setup system. Options may be setup at any time. For the initial setup we recommend that you follow the sequence provided in this manual. NOTE: The purpose of Step 2 is to familiarize you with the available options within the setup menu. There are no actions required. Use the F switch to move to the specific function that you wish to access. Then press the S switch when the function is indicated to select and start the procedure. The following is a list of the available functions:


d-t Set the date and time as retained in the instrument as per STEP 3. The engine log relies on the correct date and time for accurate recording of engine activity. There are three points at which the date and time are required to be set:

1. When the instrument is first installed

2. Whenever power is removed from the aircraft such as when the batter is replaced or has been disconnected for maintenance or other purposes

3. Every six months. In order to ensure that the date and time are always correct

the instrument will automatically request a date and time setting every six months (see STEP 3)

Int Set the intensity source for the instrument. Even with the instrument connected to an external intensity control the instrument may still be configured for internal intensity control using this setup option. STEP 4 outlines this operation. Eng This section contains all the necessary settings that relate to the engine, limits and operations. STEP 5 contains all then necessary information to set all the necessary engine options. dL Access all the externally downloadable functions of the instrument. These are outlined in Section 4. WARNING! By selecting the dL function control of the instrument is passed to the external device attached to it. If the S switch is pressed without

a terminal device being attached to the instrument the only way to release control back to the instrument is to turn the power off and back on again.


End When you have completed all the setup or downloadable options then press and release the S switch to restart the instrument with the new settings.

STEP 3 – Setting Date and Time Setting of the date and time may be invoked in two ways:

1. Manually, from the setup menu 2. Automatically, every six months, at the time of power up during normal

operations or whenever power is removed from the aircraft. The setting of the date and time is identical in both cases. Only the mode of invoking the function is different. To set the date and time manually, enter the setup mode as shown in STEP 1. Use the F switch to navigate to the d-t function. At this point press and release the S switch. If the date and time setup has been initiated by the instrument the text SEt dAtE will be constantly displayed when the instrument is first turned on. If this is the case you have two options:

1. Set the date and time (recommended) – Press the S switch 2. Skip the set date and time request – Press the F switch. In this case the

instrument will consistently request the date and time to be set each time it is turned on until such time as this has been done

Now select the set date function.

When power has been removed from the instrument the date will always default to January 1, 2000. The first step is to set the correct year. Use the F switch to step to the correct year. The setup will restart at 2000 if the maximum allowable year (2038) has been exceeded.


Once the correct year is displayed press and release the S switch. When the switch has been released the next menu option will be displayed.

The ñ character is used to symbolize the letter m throughout this manual due to the display limitations of the instrument. Press the F switch to change the value for the month.

Once the correct month is displayed press and release the S switch to save the value. Permissible month values are 1-12 and the instrument will restart at 1 if the F switch is pressed beyond the 12th month. The d character signifies setting of the day of the month. Press the F switch to change the value for the day. Once the correct day is displayed press and release the S switch to save the value. Permissible day values are dependant on the specific month and year previously selected.


Now set the hour component of the time. Press the F switch to change the value for the hour. Once the correct hour value is displayed press and release the S switch to save the value. Permissible hour values are 0 to 23.

Finally, set the minute component of the time. Press the F switch to change the value for the minutes. Once the correct minute value is displayed press and release the S switch to save the value. Permissible hour values are 0 to 59.

The instrument will now default to the next setting option in sequence. You have two choices:

1. Select the next option, or 2. Navigate to the End option and exit the setup.

If this is the first time the setup is being performed we recommend selecting the next setup option.


STEP 4 – Intensity Source Selection

To enter the intensity source selection menu press and release the S switch. The instrument will continue with one of the following two displays, dependant on the current setting of the instrument.

Internal intensity option

External intensity option

Now use the F switch to toggle between these two settings and choose the setting that matches both your installation and requirements. Note: You can select the internal option even though the external wiring has been connected. If this is done all input from the external source will be ignored and intensity will be controlled using the S and F switches. The instrument will now default to the next setting option in sequence. You have two choices:

3. Select the next option, or 4. Navigate to the End option and exit the setup.

If this is the first time the setup is being performed we recommend selecting the next setup option.


STEP 5 – Engine Options

WARNING YOU MUST CONSULT YOUR POH FOR ALL SETTINGS IN THIS SECTION.

FAILURE TO DO SO WILL INVALIDATE THE INSTALLTION.

The Eng option allows all the necessary engine parameters to be set. Engine parameters must be set in order for the instrument to provide correct data. To enter this setup option press and release the S switch.

Depending on the current setting of your instrument the display will resemble one of the following:

4 Cylinder Engine

6 Cylinder Engine

8 Cylinder Engine

Use the F switch to navigate between the various options. Once the correct setting for your engine is displayed press and release the S switch. NOTE: if the correct setting is initially displayed simply press and release the S switch to continue.

Now select the required display accuracy of the instrument. The iTac instrument is capable of providing a 1RPM accuracy over the full operational range. However you may find that your engine does not provide a constant speed (most do not). This will result in a varying least significant digit. This variance is eliminated by displaying only the three most significant digits of the engine speed. Use the F switch to toggle between the A 1 and A 10 settings.

When the required setting is displayed press and release the S switch.


Set the low RPM activation point for the instrument. This point is of great importance and must be set in conjunction with your POH and personal requirements. This setting dictates the following activities of the instrument:

1. Point at which the first bar of the display is lit

2. Trigger value for the internal engine timer. It is at this speed that the total time in service counter will be activated. Setting this value too low will result in low run (typically taxi) time being added to the total engine time. Setting it too high will short time your engine’s life and, besides being an incorrect reflection of the total engine time, may lead to failures which may be perceived to be within TBO while they are actually past TBO. We recommend a setting of 1200 for this point, but this recommendation is overridden by specification within your POH or at the discretion of the licensed installer

3. Point at which the iTac engine log will enter a Start or Stop condition Use the F switch to increase this value. Once the maximum permissible value has been reached selection will begin at 800 RPM. This setting will increment in multiples of 10. Once the required value is displayed, press and release the S switch.

Select the maximum operating RPM for your engine. Use the F switch to increase this value. Once the maximum permissible value has been reached selection will begin at a calculated allowable base value, dependant on the low RPM setting. This setting will increment in multiples of 10. Once the required value is displayed, press and release the S switch.

Select the redline RPM setting for your engine. This is the point at which the red bar will illuminate and the external annunciator will be activated. Use the F switch to increase this value. Once the maximum permissible value has been reached selection will begin at a calculated allowable base value, dependant on the maximum

operating RPM setting. This setting will increment in multiples of 10. Once the required value is displayed, press and release the S switch.


Select the allowable magneto drop when one magneto is disabled. This may also be described as the BOTH to either LEFT or RIGHT magneto drop. Use the F switch to increase this value. Once the maximum permissible value has been reached selection will restart at the low setting. This setting will increment in multiples of 5. Once the required value is displayed, press and release the S switch.

Select the allowable LEFT to RIGHT magneto drop difference, otherwise stated as the difference between engine operation when running on only the LEFT magneto and then on the RIGHT magneto. Use the F switch to increase this value. Once the maximum permissible value has been reached selection will restart at the low setting. This setting will increment in multiples of 5. Once the

required value is displayed, press and release the S switch. Depending on the current setting of the instrument, one of the following two display options will now be shown:

Limited RPM range option selected

Limited RPM range option NOT selected

Q. Does you engine have a specified RPM range where either operations are time limited or prohibited? If your answer to the above question is NO then use the F switch to select the L OF option (if it is not already selected) and then press and release the S switch. Continue with Step 6.


If your answer to the previous question is YES then use the F switch to select the L On option (if it is not already selected) and then press and release the S switch.

Use the F switch to select the low value for the limited RPM range. When the correct value is displayed press and release the S switch.

Use the F switch to select the high value for the limited RPM range. When the correct value is displayed press and release the S switch.

STEP 6 – Data Download Option

The data download is not part of the instrument setup, but it is included in the setup function to limit activation. See Section 4 for complete information regarding the use of this function. By selecting the dL function control of the instrument is passed to the external device attached to it. If the S switch is pressed without

a terminal device being attached to the instrument the only way to release control back to the instrument is to turn the power off and back on again. If you are performing the instrument setup press and release the F switch.


STEP 7 – Default Setup Complete

If all the previous setup options have been configured to meet your requirements then press and release the S switch. To reconfigure any of the setup options use the F switch to navigate to the required option.

The instrument will display the donE message and restart.

STEP 8 – Set Initial Engine Time The iTac instrument is shipped with the engine timer set to 0.00 hours. During the first 60 minutes of operation this value may be changed to reflect the actual time of the engine. WARNING: This setup option may only be executed ONCE. When the value is confirmed it will be permanently saved in the instrument configuration. Engine time may only be reset by returning the instrument to the factory or remotely by connecting your instrument to the Internet. Instructions for this procedure are not provided as part of this document and are provided as and when needed. A fee does apply for this service. To set the default engine time turn off the power to the instrument. Now hold the S switch and apply power to the instrument.

When this display is as shown, release the S switch.


The decimal point indicates the digit currently being set. Use the F switch to increment the digit counter and the S switch to select the value. Now set all four digits of the hour value for the engine timer.

Once the last digit of the hour component of the engine time has been set the instrument will then allow the setting of the decimal component of the time.

The decimal component of the engine time is represented in 100ths

of an hour. The decimal point indicates the digit currently being set. Use the F switch to increment the counter and the s switch to select the value.

Now set both digits of the decimal component of the engine time.


WARNING: READ BEFORE ACTION

The instrument display will now cycle the time set and the SUrE message. The format will be as shown below but the time values will be those you have set.

Engine time – Hour portion of time value

Engine time – Decimal portion of time value

SUrE Message

If the engine time displayed is not correct turn off the power to

the instrument NOW and start over.

If the engine time displayed is correct press and HOLD the S switch until the display stops scrolling. Release the S switch at this point. The engine time has now been set and all subsequent engine operation will increment the engine timer based upon the RPM limits previously set. Setup of the instrument has now been completed. The instrument is now ready for use.


SECTION 4 Downloadable Data Options

Hardware Connection Hardware data connection requires a standard RS-232 serial data port. In order to connect the instrument to the serial port either use the Data Interface Kit (part number iTac-DIK) or fabricate the appropriate hardware connection as follows: Using the BLACK, ORANGE and YELLOW cable bundle:

Color Signal RS-232 DB9 Pin Number Black Ground 5 Orange RxD 3 Yellow TxD 2 Software Requirements IMPORTANT NOTE: We do not provide any technical support for the use and/or setup of any Windows or other operating system utilities used to access iTac data.

In order to access the data retained by the instrument you will need any data terminal or terminal emulation software. The instrument uses a standard RS-232 data transmission standard. To communicate with the instrument configure your RS-232 terminal to operate using the following parameters: Bit rate 19,200 Data bits 8 Parity None Stop bits 1 Flow control None


Data Download To download data from the instrument connect the instrument to the RS-232 data port. Load the terminal software. Turn off the power to the instrument and restart it in the setup mode (See Section 3, Step 1).

Use the F switch to navigate to the dL (download) function. Now press and release the S switch. Control of the instrument is now passed to the terminal application. The S/F switch will have no further control on the instrument until control is relinquished back to the instrument.

The display on the terminal should now resemble that as shown. If the menu options do not appear then check the cable wiring and the terminal configuration. The remainder of this section will describe the various download functions.

While in the data download function complete control of the instrument is from the remote terminal. To return control to the instrument select option [9] -> EXIT. Alternatively you can cycle to the power to the instrument to resume normal operations.


[1] -> View Instrument Statistics Selecting option [1] will download the following data screen from the instrument:

1. The date and time will always reflect the current date and time as set in the instrument, at the time that this screen is downloaded.

2. Total engine time is the actual recorded engine time based on: a. The preset engine time, b. Plus any flight time based upon the time that the engine has exceeded

the “Low RPM Limit”

3. Maximum recorded RPM is the maximum RPM that has been recorded by the iTac instrument during the service lifetime of the instrument.

4. All other displayed parameters are as per the settings provided during the instrument setup.


Options [2] to [4] – Data Log Download These options are all similar in function with the exception of the amount of data that they will allow the instrument to send to the terminal. Options [2] and [3] are mostly for real time viewing of the most recent engine activity while option [4] will download the entire engine log. Depending on the time in service downloading the entire engine log may take a while. It is recommended that data be saved to a file when using this option. This file may then be opened using most common applications (Excel, Access, any word processing or text viewer).

The engine log will retain in excess of 8,000 start/stop records without the need for any battery backup. Once the log becomes full it will overwrite the oldest records ensuring that the instrument always retains the most recent 8,000 log entries.


Note: In some cases the engine log may record successive Start/Stop events at very close time points. This is a normal occurrence. For example, assume the Low RPM Limit is set at 1000 RPM and it is your common practice to idle the engine at 1000 RPM when on the ground. Engine speed to not perfectly constant (effected by many external factors other than engine performance). If the RPM were to vary between say 980 and 1020 RPM then each time this occurred the instrument would log the time the engine was running over 1000 RPM and log a Stop condition every time the RPM fell below this point. If at any time during the data download you wish to terminate the function simply press Ctrl + C (i.e. Control C).


Section 5 Operation

Normal Operations

When the instrument is first turned on the display will be as shown. The only functions available at this point are:

1. Viewing of engine time 2. Setting of internal intensity (if enabled)

Use the F switch to navigate through the various options.

When the engine is running the LED bar will display the current status as relates to the limits that have been defined during the setup.

RPM below engine time trigger level

Engine timer active and engine Start condition recorded in engine log

Operation within normal

limits

If the limited RPM option has been enabled then the RED bar will always be on when then engine is operating within the limited range. If a device has been attached to the external annunciator then this device will be activated as well.


Magneto Failure Detection iTac will detect the failure of a magneto (absence of a spark generated in the primary coil) within less than one revolution. In the event that both magnetos fail the iTac will no longer display RPM information. Magneto failures are displayed and controlled as follows:

When a failure is detected in the LEFT magneto the RPM bar display is immediately disabled. Valid RPM data will be displayed as soon as the failure is acknowledged by the pilot.

To acknowledge the failure press and hold the S switch until the display reverts to the normal display. As long as the magneto failure condition exists the L LED will remain lit. Should the failure be eliminated the LED will automatically turn off and regular operation of the instrument will resume.

When a failure is detected in the RIGHT magneto the RPM bar display is immediately disabled. Valid RPM data will be displayed as soon as the failure is acknowledged by the pilot. To acknowledge the failure press and hold the S switch until the display reverts to the normal display. As long as the magneto failure condition exists the R LED will remain lit. Should the failure be eliminated the LED will automatically turn off and regular operation of the instrument will resume.


Magneto Check Function The magneto check function is usually used at run up to confirm engine operation within defined parameters. To perform the magneto check proceed as follows:

Set the engine to the desired RPM and ensure that engine speed has stabilized.

NOTE: When in the magneto check function the LED bar will not illuminate.

Press and release the F switch. This instrument display will now be as shown (with the exception of the RPM which will be the approved speed for this operation on your specific aircraft). Notice that the CK (check) LED has illuminated as well as both the L and R LED’s. At this point the instrument requires that both magnetos be

selected and operating (i.e. ignition switch is set to BOTH). Now press and release the S switch. This action will record the RPM with both magnetos running.

The instrument display will now show the current RPM with the L and CK LED’s illuminated. Using the ignition switch, select the LEFT magneto only. The instrument now requires that the RPM value for operation on the LEFT magneto be recorded. Press and release the S switch to record this value.

The instrument display will now show the current RPM with the R and CK LED’s illuminated. Using the ignition switch, select the RIGHT magneto only. The instrument now requires that the RPM value for operation on the RIGHT magneto be recorded. Press and release the S switch to record this value.


If the magneto check performed within the allowable parameters then the CK LED will be illuminated and the PASS message displayed. You can use the F switch to navigate back to normal engine operations. If no further operations are selected the instrument will resume normal operation within approximately ten seconds.

If the instrument detected that any of the parameters were out of specification for the magneto check function then a detailed message will be displayed indicating the detected failure. The matrix of possible errors is of a significant size and thus all possible errors are not published in this document. However, they are all self explanatory and will follow this format:

CK LED on and FAIL message

Error message indicating failure detected

RPM value, if

applicable

In the above example the LEFT to RIGHT permissible difference was set at 50 RPM. During the magneto check the actual LEFT to RIGHT difference was 66 RPM and is thus reported as a failure. To cancel a magneto check failure press and hold the F switch until the text scrolling stops. Then release the F switch to return to normal operations.


View Engine Time When in the engine time mode, the instrument will return to the normal operations mode after approximately ten seconds of selection inactivity. To access the engine time function, use the F switch to navigate to the engine time option. The display should resemble that as below.

When in the instrument is in the engine time display mode the TM LED will be lit and the “hours” portion of the time will be displayed.

To view the 1/100ths portion of the engine time press and hold the switch in the S position.

To return to normal operations toggle the F switch THREE times if the internal intensity option is being used or ONCE if the external intensity option is being used.


Intensity Control If you have installed and setup the instrument to utilize the external intensity function then ignore this topic. This option is only available when the intensity source has been set to internal. When in either the increment or decrement intensity functions, the instrument will return to the normal operations mode after approximately fifteen seconds of selection inactivity. To increment the instrument intensity toggle the F switch to reach the increment intensity function as displayed below.

The increment intensity control is identified by the “n” character in the RPM display and all LED elements being lit. To increase the instrument intensity hold (or toggle) the switch in the S position until the display changes to the required intensity. Finally toggle the F switch TWICE to return to normal operations.

To decrement the instrument intensity toggle the F switch to reach the decrement intensity function as displayed below.

The decrement intensity control is identified by the “u” character in the RPM display and all LED elements being lit. To decrease the instrument intensity hold (or toggle) the switch in the S position until the display changes to the required intensity. Then toggle the F switch ONCE to return to normal operations.


SECTION 6 iTac Specifications

Dimensions

• Fits standard 2.25” mounting hole • 2.45” X 2.45” X 1.6” • 2” viewing area • Weight - Instrument: 9 oz • Weight – Magneto sensor: ½ oz

Display

• Custom design color bar display • Multi-color sunlight visible • InGaAIPGaN LED technology • 100,000 hours operating life • Analog and digital readout of RPM levels

RPM Ranges

• 4 Cyl : 460 to 9,999 • 6 Cyl : 310 to 9,999 • 8 Cyl : 230 to 9.999

Accuracy

• 1 RPM. Programmable resolution of 1 or 10 RPM

Safety

• Color coded operation ranges • Limited RPM operation alarm • External alarm driver output • External processor watchdog

Operating Temperature ( Per DO-160(D) )

• -15C to +55C (5F to 131F) Certifications Pending

• DO-160(D) • DO-178(B) • TSO C49b • STC for ~700 aircraft

Programmable Options

• Date and time • Intensity source – internal or external • Selectable 4, 6 or 8 cylinders • Low, high and redline RPM • All magneto drop parameters • Limited RPM operations: on/off and

high/low limits

Download Options

• Requires standard RS-232 device • Uses any ASCII terminal emulation

software • Optional data cables and install kit • Downloadable engine statistics and

instrument configuration • Download last 10 / 20 entries or the entire

engine log Engine Log

• More than 8,000 start/stop events • Date and time recorded for each event • Maximum RPM recorded with date and

time of occurrence • All engine settings

Engine Timer

• Integrated engine timer • Records engine time (not flight time) • Programmable trigger level based on

engine RPM • One-time default engine time setting option

Operating Voltage

• 6V-40V DC continuous • 40V-60V for < 5 seconds

Power Consumption

• ~30nA (not operating). When not in use the instrument uses the aircraft battery to retain date and time information.

• 290mA Max (daytime operation) • 50mA Min (nighttime operation)

Signal Aquisition

• Magneto P-Lead connection and Hall Effect pickup

All specifications subject to change.

© 2005 Aerospace Logic Inc.

Documents

iTac Manual - v1.0 - Aircraft Spruce