579857

Garmin GTN 650 Manual

78
Zoom out
Zoom in
Previous page
1/412
Next page
GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 2-36 Rev. 4
2.4.11.4 Shield Termination Consideration
Shield termination at non-Garmin equipment end must be as short as possible and not to exceed 3.0”
taking into consideration any non-Garmin equipment’s installation requirements. When there are no
requirements given by the non-Garmin equipment installation manual, then the shields may be connected
to the metal connector backshell when the backshell is grounded to airframe chassis ground. Alternately,
the shield termination may be directly connected to airframe chassis ground. Although the interconnects
in Appendix E do not show intermediate connectors, all shields must have continuity at any intermediate
connectors used unless otherwise specified. When shields are terminated to the aircraft ground or metal
backshell to provide this continuity, the shield drain wire must be no longer than 3 inches, unless non-
Garmin equipment requires shorter length. The termination method from Section 3.6.3.1 may be used at
these locations unless this conflicts with the requirement of non-Garmin equipment.
If intermediate connectors are used on an audio line, run the shields through a pin on all intermediate
connectors. Audio line shields should be continuous from end to end and be grounded only at one end to
prevent ground loops. See Section 2.4.12.
Shield splicing should be done at the GTN end close to the connector, similar to other non-spliced shields,
unless this conflicts with requirements from remote-end equipment. Honeywell equipment with EMI
backshells (e.g. 360 degree circular connectors, backshells with shields terminated inside a metal
backshell) require the shields to be terminated at the remote end from the GTN utilizing the EMI
backshell.
If a wire from the GTN connector goes to a connector at the remote end that includes overbraided wires
then the new wiring added at the remote end connector must also be overbraided. Any wires spliced into
this wire must also be overbraided. If the wiring passes through bulkhead connectors then each segment
shall be overbraided and the overbraid must be grounded at both ends, unless otherwise shown in the
remote equipment’s installation manual. The overbraid must be terminated as close to the connector as
possible taking into account any requirements imposed by the non-Garmin equipment. These additional
wires must be separately overbraided and ensure they are routed with the existing cable where possible.
The overbraid shall have a minimum of 90% optical coverage.
2.4.11.5 GTN Cooling Requirements
The GTN unit meets all TSO requirements without external cooling. However, as with all electronic
equipment, lower operating temperatures extend equipment life. Reducing the operating temperature may
reduce the mean time between failures (MTBF).
Units tightly packed in the avionics stack heat each other through radiation, convection, and sometimes
by direct conduction. Even a single unit operates at a much higher temperature in still air than in moving
air. Fans or some other means of moving the air around electronic equipment are usually a worthwhile
investment.
The GTN has a cooling fan integrated into the backplate to draw forced-air cooling through the unit.
There are inlets along the left, right, and bottom sides of the GTN bezel that allow air to flow through the
unit. Ensure that there are no obstructions to the air inlets or fan exhaust. Airflow should be unrestricted
from the bezel inlets to the fan outlet in the backplate on the rear of the unit.
2.4.11.6 GMA 35 Cooling Requirements
The GMA 35 does not have provisions for attaching cooling air and does not generate an excessive
amount of heat during typical operations, however the thermal characteristics of the installation should
always be assessed. An undesirable thermal condition could be created due to the unit's own internal
power dissipation combined with restricted ventilation, or due to heat generated by adjacent equipment.
Limiting thermal build up, by means of an external fan or natural convection is always a good practice
and is recommended to increase the product life.
… 78 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Garmin GTN 650 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Garmin GTN 650 in the language / languages: English as an attachment in your email.

The manual is 8,92 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info