Bedienungsanleitung Garmin GTN 650 (Seite 78 von 412) (Englisch)

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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.

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