Dynon EFIS-D10A Instruction Manual

EFIS-D10A Standby Display
Installation & Maintenance Manual
Includes Instructions for Continued Airworthiness
The EFIS-D10A Standby Display must be used in conjunction with SkyView HDX.
103914-000
Revision A
2/4/2020
Copyright © 2020 by Dynon Avionics, Inc.
Dynon Avionics grants third parties' permission to print this document

Contact Information
Dynon Avionics, Inc.
19825 141st Place NE
Woodinville, WA 98072
Phone: [phone]
Business Operations: 8:00 AM–5:00 PM (Pacific Time) Monday–Friday
Technical Support Operations: 7:00 AM–4:00 PM (Pacific Time) Monday–Friday
Email Sales: [email protected]
Email Support: [email protected]
Fax: [phone]
Web: www.dynoncertified.com
Copyright
©2020 Dynon Avionics, Inc. All rights reserved. No part of this manual may be reproduced, copied, transmitted, disseminated or stored in any
storage medium, for any purpose without the express written permission of Dynon Avionics. Dynon Avionics hereby grants permission to
download a single copy of this manual and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed for
personal use, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and
provided further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
Information in this document is subject to change without notice. Dynon Avionics reserves the right to change or improve its products and to
make changes in the content without obligation to notify any person or organization of such changes. Visit the Dynon Avionics website
(www.dynonavionics.com) for current updates and supplemental information concerning the use and operation of this and other Dynon Avionics
products.

EFIS-D10A Standby Display - Installation & Maintenance Manual, Revision A
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Revision History
REV
DATE
APPROVED
DESCRIPTION OF CHANGE
A
2/4/2020
ECO 341990
Initial Release

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EFIS-D10A Standby Display - Installation & Maintenance Manual, Revision A
Table of Contents
1Introduction.............................................................................................. 5
1.1 Product Delivery and Warranty..................................................................................... 5
1.2 Product Registration..................................................................................................... 6
1.3 Using this Manual......................................................................................................... 6
1.4 Reference Documents.................................................................................................. 7
1.5 Manual Conventions..................................................................................................... 6
1.6 Installation Compliance ................................................................................................ 7
1.7 Installation Record........................................................................................................ 7
2Pre-installation Information..................................................................... 8
3Instrument Panel Design ......................................................................... 9
4Mechanical Installation.......................................................................... 10
5Electrical Installation ............................................................................. 12
6Configuration.......................................................................................... 13
6.1 Unit Operation ............................................................................................................ 13
6.2 Display Functions....................................................................................................... 13
6.3 Airspeed Color Bar Thresholds .................................................................................. 15
6.4 Zero Pitch Calibration................................................................................................. 16
7Troubleshooting..................................................................................... 17
8Maintenance ........................................................................................... 18
8.1 Backup Battery Test................................................................................................... 18
8.2 Backup Battery Replacement..................................................................................... 18
8.3 EFIS-D10A Removal and Re-Installation ................................................................... 19
8.4 IFR Altimeter System Equipment Test (FAR 91.411)................................................. 21
8.5 Firmware Updates...................................................................................................... 21

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1 Introduction
This manual provides information about the mechanical, pneumatic, and electrical installation of
the EFIS-D10A (see Figure 1). It also provides configuration, troubleshooting, and maintenance
information. The information in this manual is general to all airplanes on the Approved Model
List (AML) of Supplemental Type Certificate (STC) SA02594SE.
In Certified installations, the EFIS-D10A serves as a standby display for the Primary Flight
Display (PFD). The EFIS-D10A uses internal calibrated sensors to present Airspeed, Altitude,
and Attitude data. To ensure accuracy in its readings, it is important to install and configure the
EFIS-D10A as detailed in this manual.
Figure 1 EFIS-D10A
1.1 Product Delivery and Warranty
Upon delivery, visually inspect the EFIS-D10A and wiring harness for damage that may have
occurred during shipping. If damage has occurred, contact Dynon Technical Support.
Disassembled or modified components may not be eligible for repair under warranty.
Additionally, once a component has been disassembled, it is not considered airworthy and must
be serviced at the factory. Dynon Avionics products do not contain any field-serviceable parts
like fuses, so there is no reason to disassemble any component.

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EFIS-D10A Standby Display - Installation & Maintenance Manual, Revision A
1.2 Product Registration
Register your EFIS-D10A at http://register.dynonavionics.com. Registering your product verifies
ownership, expedites warranty claims, and allows Dynon Avionics to notify you when product
Service Bulletins and Technical Advisories are published. You can also sign up to receive news
and product announcements from Dynon Avionics. Dynon Avionics will not share your contact
information with third-parties or send you announcements without your explicit consent.
1.3 Using this Manual
To reduce paper usage, Dynon Avionics does not provide a printed version of this manual.
However, Dynon Avionics grants permission to third parties to print this manual as necessary.
The most recent PDF version is available for download at www.dynon.aero/stcdocs. Thismanual
is updated periodically, and it's important to use the most recent version.
Dynon Avionics suggests keeping a PDF version of the manual on a smartphone, tablet, or
laptop computer during installation and maintenance. Using the manual electronically allows
figures to be viewed in color and higher level of detail, perform keyword searches, and quickly
navigate the document.
This manual is periodically updated. Always use the most recent document version when
installing and maintaining Dynon Avionics equipment.
1.4 Manual Conventions
This manual uses the following iconography:
Alerts reader to potential injury or equipment damage.
Alerts reader to important information.
Alerts reader to helpful tips or suggestions.

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1.5 Reference Documents
The following documents are referenced or used as content sources for this document:
•103261-000 SkyView HDX Certified Installation Manual
•103272-000 SkyView HDX Certified Airplane Flight Manual Supplement
•102949-003 SkyView HDX Pilot’s User Guide
•103488-000 SkyView HDX Wiring Diagram
•43.13-1B Acceptable Methods, Techniques and Practices- Aircraft Inspection and Repair
•43.13-2B Acceptable Methods, Techniques and Practices- Aircraft Alterations
1.6 Installation Compliance
Airplanes on the AML meet a minimum required configuration for applicability of the STC.
However, some airplanes may have been modified, and consequently, it may be difficult to use
the information in this manual to completely substantiate the installation in compliance with the
STC. It is the installer's responsibility to make the final determination of applicability for each
individual airplane.
Prior to completing the installation, and before returning the airplane to service, the installer must
complete and submit an FAA Form 337 Major Repair & Alteration (Airframe, Powerplant,
Propeller, or Appliance) to the appropriate FAA Flight Standards District Office. The form must
include the following:
•Description of component installation.
•Description about how component interfaces with existing equipment and systems.
•Appropriately approved or acceptable data that demonstrates compliance.
Refer to AC 43.9-1E - Instructions for Completion of FAA Form 337 for additional information.
1.7 Installation Record
It is the responsibility of the mechanic or facility performing the installation to record where
equipment is installed in the airplane. Dynon Avionics provides a form (SkyView HDX Certified
Equipment Installation Record) to record this information. Authorized installers can download
the document at www.dynon.aero/stcdocs. When completed, the documentation should be
entered into airplane’s permanent record.

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2 Pre-installation Information
Read and understand the following before proceeding with installation activities.
Always install avionics equipment in accordance with the guidance and approved
engineering methods outlined the following FAA documents:
•23.1311-1C - Installation of Electronic Display in Part 23 Airplanes
•AC 43.13-1B Acceptable Methods, Techniques, and Practices - Aircraft
Inspection
•AC 43.13-2B Acceptable Methods, Techniques, and Practices - Aircraft
Alterations
The certified mechanic who will authorize the airplane's return to service should
agree with the installation plan (i.e., methods, equipment location, wiring harness
routing, etc.) before installation activities begin. This will help avoid potential
rework should any part of the installation be found non-compliant.
Installers should review and become familiar with the information and procedures
in this document before beginning an installation.

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3 Instrument Panel Design
Installing an EFIS-D10A often necessitates the design and fabrication of new instrument panel.
When designing new instrument panels, installers must adhere to Part 23 of the Code of Federal
Regulations guidance and methods for locating equipment that displays flight information. Dynon
Avionics provides helpful instrument panel design information for Certified installations in the
SkyView HDX Certified Installation Manual document. Authorized installers can download the
document at www.dynon.aero/stcdocs.
Always install avionics equipment in accordance with the guidance and approved
engineering methods outlined the following FAA documents:
•23.1311-1C - Installation of Electronic Display in Part 23 Airplanes
•AC 43.13-1B Acceptable Methods, Techniques, and Practices - Aircraft
Inspection
•AC 43.13-2B Acceptable Methods, Techniques, and Practices - Aircraft
Alterations
It is highly recommended that the certified mechanic who will authorize the
airplane's return to service agrees with the instrument panel design before
installation activities begin. This will help avoid potential rework should any part of
the installation be found non-compliant.
See Figure 2 for volumetric space requirements for the EFIS-D10A. Dimensions include
additional space for electrical connectors and harnesses bent at the minimum bend radius of 90
degrees.
Figure 2: EFIS-D10A, Volume Dimensions

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EFIS-D10A Standby Display - Installation & Maintenance Manual, Revision A
4 Mechanical Installation
The EFIS-D10A mounts directly to the instrument panel. Observe the following guidelines when
installing an EFIS-D10A:
•Unit must be mounted level (parallel to horizon in flight) in the lateral axis, and
perpendicular to the longitudinal axis. Correct attitude performance depends on mounting
the unit in alignment with the airplane's longitudinal and lateral axes.
•Unit only supports landscape viewing, so it must be mounted horizontally.
•Wire harness extends about 3" (76mm) from the rear of the unit.
•Front bezel will extend 0.8" (20mm) beyond the face of the instrument panel.
•Unit will need to be accessed during service, therefore:
▪Plan to provide enough slack in the wire harness and Pitot and Static lines to
disconnect and reconnect them when unit is removed from the instrument panel.
▪Plan to provide enough room behind instrument panel to disconnect and reconnect
the wire harness and Pitot and Static lines when unit is still mounted.
•Avoid placing the unit near heater vents or sources of extremely hot air.
The unit does not normally require forced air for cooling. However, if the airplane is
to be operated in hot climates, allow for adequate ventilation space so operating
temperature range for the unit is not exceeded.
To mount the EFIS-D10A to an instrument panel:
1. Use Figure 3 as a guide to prepare instrument panel for cutting.
2. Cut an opening for unit in instrument panel. Make sure instrument panel opening
includes necessary margins for paint or other applied finishes.
3. Drill (#16) and deburr holes for threaded studs.
4. Line-up threaded studs to holes and insert unit into instrument panel.
5. Secure unit to instrument panel with included #6 flat washers and #6-32 lock nuts.
To attach Pitot and Static lines to the EFIS-D10A:
1. Source (2) correctly-sized 1/8" NPT to tube adapters and T-connectors for existing Pitot
and Static lines.
2. Use T-connectors to splice into existing Pitot and Static lines.
3. Remove male plugs from Pitot and Static female pipe fittings on EFIS-D10A. Plug in
AoA pipe fitting remains in place.
4. Apply Teflon tape and thread 1/8" NPT adapters into Pitot and Static female fittings on
EFIS-D10A. Use two wrenches to tighten fittings—DO NOT over-tighten or allow female
fittings to rotate.

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5. Connect existing Pitot and Static lines to corresponding 1/8" NPT adapters on
EFIS-D10A.
Figure 3: EFIS-D10A, Panel Cutout & Mounting Dimensions

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5 Electrical Installation
The EFIS-D10A is shipped with D25F wire harness that plugs into the D25M connector on the
rear of the unit. The wire harness has designated wires for connection to airplane power (see
Table 1 for pin/wire connections).
Table 1: EFIS D10A, Pin/Wire Connection
D10A
D25 PIN #
D10A
D25 WIRE FUNCTION
D10A
D25 WIRE COLOR
CONNECTION / NOTES
1
Power
Red
Electrical Bus
3A Circuit Breaker/Fuse
2
Power
Red
Electrical Bus
3A Circuit Breaker/Fuse
3
Ground
Black
Airframe Ground
4
Ground
Black
Airframe Ground
5–25
None
No Wire
No Connection
The EFIS-D10A is compatible with 14V and 28V electrical systems and requires a power supply
of 10–30V DC. Power input to the EFIS-D10A must be protected with an aviation-grade 3A circuit
breaker or replaceable fuse. Two power wires connected to the same power source reduce the
current load in each wire. Likewise, two ground wires are also used.
To connect the EFIS-D10A to an airplane's electrical system:
1. Make sure airplane power is disconnected.
2. Connect dedicated 3A circuit breaker or replaceable fuse to appropriate electrical bus.
See airplane manufacturer's documentation for guidance.
3. Route Power wires (pins 1, 2) to power source and Ground wires (pins 3, 4) to airframe
ground.
4. Support and secure wires to avoid high heat and entanglement with moving
components.
5. Use insulated connectors to connect Power wires to breaker/fuse.
6. Use insulated connectors to connect Ground wires to airframe ground.

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6 Configuration
There are a few simple configuration tasks that must be completed before using the EFIS-D10A.
This section guides you through those tasks.
Prior to shipping, the EFIS-D10A undergoes a comprehensive calibration,
verification, and burn-in routine to minimize setup time and to ensure every unit
meets Dynon Avionics' stringent performance specifications.
6.1 Unit Operation
After completing the mechanical and electrical installations, installer must verify of the EFIS-
D10A operation.
To verify operation of the EFIS-D10A:
1. Turn unit on by energizing airplane power to which it is connected.
2. Ensure display screen is bright and readable.
3. Ensure Airspeed, Altitude, and Attitude instrument functions appear.
6.2 Display Functions
Some display functions on the EFIS-D10A have not been approved for Certified installations by
STC SA02594SE. Installers should disable non-Certified display functions prior to flight.
Additionally, some approved display functions have configurable settings. See Table 2 for EFIS-
D10A display functions and associated settings.
Table 2: Display Functions
MENU ITEM
FUNCTION
ACTION
CERTIFIED Y/N?
ALTBAR
Altimeter Bar
Toggles altitude tape display on/off.
Yes
ALTDIG
Altimeter Digital
Toggles digital altitude display on/off.
Yes
IASBAR
Indicated Airspeed
Bar
Toggles airspeed tape display on/off.
Yes
IASDIG
Indicated Airspeed
Digital
Toggles digital airspeed display on/off.
Yes
HDG
Heading
Toggles heading tape and digital heading
displays on/off.
No
BALL
Slip/skid Ball
Toggles slip/skid ball and center marker
displays on/off.
Yes
TURNRT
Turn Rate
Toggles turn rate indicator and scale marker
displays on/off.
Yes
AOABAR
AOA Bar
Toggles angle of attack indicator display on/off.
No
CLOCK
Clock
Toggles clock display on/off.
No
BARO
Altimeter Setting
Toggles current altimeter setting display on/off.
Yes

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EFIS-D10A Standby Display - Installation & Maintenance Manual, Revision A
MENU ITEM
FUNCTION
ACTION
CERTIFIED Y/N?
ROLL
Roll Scale
Configures roll scale display:
N –turns roll scale display off.
1 –turns roll scale display on and pointer is
fixed (banked pointer).
2 –turns roll scale display on and pointer is
movable (sky pointer).
Yes
GTRK
Ground Track
Configures ground track indicator on heading
tape display:
N –hides ground track indicator.
Y –shows ground track indicator.
No
WIND
Winds Aloft
Configures wind arrow and speed indicator:
N –hides wind arrow and speed indicator.
Y –shows wind arrow and speed indicator.
No
ASTRND
Airspeed Trend
Toggles 6-second airspeed trend indicator next
to airspeed tape display on/off.
Yes
VSI
Vertical Speed
Indicator
Configures vertical speed indicator next to
altitude tape display:
N –turns vertical speed indicator off.
1k –turns vertical speed indicator on and sets
1000 ft/min non-linear scaling.
2k –turns vertical speed indicator on and sets
2000 ft/min linear scaling.
4k –turns vertical speed indicator on and sets
4000 ft/min non-linear scaling.
Yes
CDI
Course Deviation
Indicator
Configures course deviation indicator above
slip/skid ball display:
N –hides course deviation indicator.
Y –shows course deviation indicator.
GS –shows both course deviation and
glidescope indicators.
No
CRS
Course Pointer
Turns V-shaped course pointer indicator on
heading tape display on/off.
No
TRIM
Elevator Trim
Turns elevator trim indicator display on/off.
No
To configure display functions:
1. Press any button (except left and right hotkeys) on EFIS page, and then press MORE
> SETUP > CLUTTR.
2. Find a Menu Item associate with a function. Press MORE to scroll through Menu Items.
3. Toggle function on/off or configure function as needed (see Table 2 for details).
4. When finished, press BACK to return to previous menu.

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6.3 Airspeed Color Bar Thresholds
Airspeed color bar thresholds are configured in the IASCLR menu. In this menu, values are
entered for the five airspeed constants (Vso, Vs1, Vfe, Vno, and Vne). Each airspeed constant
has its own button. Values can be entered in units of knots, mph, or km/h. Displayed airspeed
units are changed by pressing any button (except left and right hotkeys) on EFIS page, and then
pressing MORE > SETUP > UNITS > IAS. Always make sure the EFIS-D10A airspeed unit is
the same as the SkyView HDX display airspeed unit.
To configure color bar thresholds for each airspeed constant:
1. Press any button (except left and right hotkeys) on EFIS page, and then press MORE
> SETUP > MORE > IASCLR.
2. Select an airspeed constant (VSO, VS1, VFE, VNO, VNE).
3. Press SEL to select a digit in the airspeed constant value.
4. Press DEC- or INC+ to decrement or increment selected digit.
5. When finished, press BACK to return to previous menu.
Some colors may not be displayed until the airplane has achieved airspeeds in the
range of each threshold.

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6.4 Zero Pitch Calibration
Zero Pitch calibration should be considered a configuration step that does not need to be
performed routinely. This calibration is not the same as a parallax adjustment on a normal
attitude indicator. Additionally, this calibration should not be used to "zero-out" pitch when the
airplane is at an attitude other than level.
This calibration should be performed inflight with the airplane configured for cruise. For purposes
of this calibration, level is defined as the attitude at which the airplane's longitudinal axis is
parallel to the ground. For most airplanes, the attitude the airplane assumes at normal cruise
speeds is acceptable.
It is the pilot's responsibility to fly the airplane safely while performing any in-flight
calibration procedures. The safest calibration procedures include a second
person to perform any necessary steps on the unit.
To calibrate zero pitch:
1. While flying airplane straight, level, and at cruise power, enter menu system by pressing
any button (except left and right hotkeys) on EFIS page, and then press MORE >
SETUP > PITCH.
2. Press INC - or DEC + until the horizon line intersects the center of the crosshairs.
3. When finished, press BACK > EXIT.
This calibration must be performed while the airplane is level to ensure proper
pitch and roll display throughout all maneuvers.

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7 Troubleshooting
The EFIS-D10A includes limited self-diagnostic capability. If a fault with the EFIS-D10A is
detected, a message will be displayed on the screen. The following table provides a
recommendation for each specific warning.
Table 3: EFIS-D10A Self-Diagnostic Messages
MESSAGE
POSSIBLE CAUSES
RESULT/ACTION
INTERNAL ERROR SERVICE UNIT
This error signifies that the EFIS-
D10A has detected internal
problems in its firmware or
calibration tables.
Call Dynon Avionics Technical
Support immediately. It may be
possible to recover unit in the field.
However, it is likely that the unit will
have to be returned for service.
TEMPERATURE UNSTABLE
When the unit is turned on after
having been off for a long period of
time, its internal temperature will
rise above ambient temperature at
a rapid rate.
This rapid change in temperature
can sometimes reduce the
reliability of the sensors' outputs.
Therefore, this alert is displayed,
and the horizon indication is
changed from blue/brown to
grey/black.
The screen remains normal color,
but the message is displayed until
the temperature within the unit has
stabilized. This temperature
instability should last no longer than
2 minutes. For this reason, it is a
good idea to turn the unit on before
you run through any of the preflight
procedures, so that it will be ready
by the time you are ready to fly.
TEMPERATURE OUT OF SPEC
The temperature inside the unit is
outside of -22ºF to 122ºF (-30ºC to
50ºC).
The screen remains normal color,
but the message is displayed until
the temperature within the unit is
within the specified range. This is
most common in unventilated
panels during hot periods. If you
continue to see this alert, provide
more airflow to the space around
the EFIS-D10A.
INTERNAL BATTERY LOW
You will see this alert only when
operating the unit solely off the
internal backup battery. When its
voltage has dropped below a
certain threshold, you will see this
alert. Additionally, the voltmeter will
be displayed onscreen.
The alert will disappear when you
press any button on the EFIS-D10A;
however, it is advised that you do
not ignore this alert, as it appears
when the unit’s internal battery has
very little life left. This alert will also
go away upon the application of
external power. At that point, the
battery will begin charging off the
external power.

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8 Maintenance
8.1 Backup Battery Test
The EFIS-D10A backup battery must be tested once every 12 months to ensure it is operational
and meets the nominal 45-minute expected backup operation period. The backup battery must
be fully charged prior to beginning the test.
To ensure the EFIS-D10A backup battery is fully charged:
1. Allow unit to draw power from airplane. Backup battery must be charged to at least 16.0
volts.
2. Enter menu system by pressing any button (except left and right hotkeys) on an EFIS
page, and then press EFIS > MORE > INFO > LEFT > VMETER.
3. Make sure backup battery is charged to at least 16.0 volts. Backup battery may charge
up to 16.8 volts, but it is only necessary to charge it to 16.0 volts for the test.
To test the EFIS-D10A backup battery:
1. Remove all sources of external power from unit. When power is lost, a red bar will
appear with a 30-second countdown timer.
2. Press STAY ON to allow unit to continue operating off its backup battery.
3. Enter menu system by pressing anybutton (except left and right hotkeys) on EFIS page,
and then press MORE > DIM > BRTTR and fully increase brightness level.
4. Let the unit remain on.
5. After 45 minutes, if unit has not turned off and does not display the INTERNAL
BATTERY LOW warning, the backup battery passes test.
6. If backup battery did not pass test, then it must be replaced (see Section 8.2 Backup
Battery Replacement for instructions).
7. If backup battery passed test, restore power to unit and charge backup battery until
voltage is above 15.0 volts before returning to service.
8.2 Backup Battery Replacement
This section provides replacement procedures for the EFIS-D10A backup battery.
Replacement EFIS-D10A backup batteries are available from Dynon Avionics or
authorized dealers and can be replaced in the field.
Location:
The backup battery is internal to the EFIS-D10A.

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To replace the EFIS-D10A backup battery:
1. If needed, remove unit from instrument panel (see Section 8.3 EFIS-D10A Removal and
Re-Installation for instructions). Not removing Pitot and Static tubes allows unit to return
to service without a leak check.
2. Open backup battery door by removing hex screws (see Figure 4). Do not remove other
screws.
3. Unplug electrical connection between backup battery and unit and gently pull backup
battery out of unit.
4. Insert new backup battery with "bumpy" side up, toward protective foam.
5. Plug backup battery electrical connector into matching unit electrical connector.
6. Verify new backup battery is operational by pressing Button #1 on EFIS-D10A page.
Unit should boot up and present the display. Press and hold Button #1 until unit powers
off.
7. Position electrical connectors so they centered on end of backup battery. Make sure
electrical connectors will not interfere with bottom hex screw (see Figure 4).
8. Position backup battery door over opening on unit.
9. Insert bottom hex screw (see Figure 4) and tighten. DO NOT over-tighten.
10. Insert upper hex screws (see Figure 4) and tighten while gently pressing on door. DO
NOT over-tighten. The upper hex screws thread into unit casing, where it is easy to
over-tighten and strip hole threads.
8.3 EFIS-D10A Removal and Re-Installation
This section provides removal and re-installation procedures for the EFIS-D10A.
Location:
The EFIS-D10A is typically located on the left side of the instrument panel. For specific location,
see the Equipment Installation Record document associated with the airplane.
To remove the EFIS-D10A:
1. Shut down main power bus.
2. Remove lock nuts and washers from mounting studs that secure unit to instrument panel
(see Figure 4). Keep hardware for re-installation.
3. Carefully slide unit out.
4. Disconnect and cap 1/8" NPT Pitot and Static fittings on unit (see Figure 4). AoA fitting
should already be capped.
5. Cap Pitot and Static tubes.
6. Remove (2) retention screws on D25 connector and disconnect wire harness from unit
(see Figure 4).

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To re-install the EFIS-D10A:
1. Connect wire harness to D25 connector on unit (see Figure 4) and secure with (2)
retention screws.
2. Attach Pitot and Static tubes to 1/8" NPT fittings on unit (see Figure 4).
3. Line-up mounting studs to holes and insert unit into instrument panel.
4. Secure unit to instrument panel with original lock nuts and washers (see Figure 4).
If original mounting hardware is lost, use AN365-832 (lock nut) and AN960-8
(washer) or comparable for replacement.
5. Restore power to main bus.
6. Check system for leaks (see airplane manufacturer's maintenance manual for
instructions).
Figure 4: EFIS-D10A, Rear View