Cooling Air; Gia 63 Minimum Installation Requirements - Garmin GIA 63 Installation Manual

2.5 Cooling Air

The GIA 63(W) meets all TSO requirements without external cooling. However, as with all electronic
equipment, lower operating temperatures extend equipment life. On the average, reducing the operating
temperature by 15-20 °C (25 to 35 °F) doubles the mean time between failure (MTBF). Recommended
airflow rating is 1 CFM (cubic foot per minute) at a pressure equivalent to 0.1 inches of water. Potential
damage to your GIA 63(W) may occur by using outside forced air to cool the equipment. Therefore, it is
recommended that an electric forced air fan be installed, of the indicated rating, to cool this equipment.
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. A 5/8" diameter air fitting is provided on the rear of the mounting rack for the purpose of
admitting cooling air under such conditions. If a form of forced air cooling is installed, make certain that
rainwater cannot enter and be sprayed on the equipment. Refer to the G1000 System Installation manual,
Garmin part number 190-00303-00, for information on cooling requirements.

2.6 GIA 63 Minimum Installation Requirements

Below is a list of required devices for TSO-C129a category A1 certification.
Pressure Altitude Device
This device delivers pressure altitude data to the GIA 63. This data comes from the Garmin GDC 74A
Air Data Computer.
Manual Course Device
This device delivers the manual course select to the GIA 63, which is required for the VOR receiver, and
optional for the GPS receiver. Course information can come from an analog resolver, or from the
GDU PFD/MFD via Ethernet HSDB.
HSI/CDI Indicator or GDU
This device displays Nav Flag, Left/Right, To/From, Glideslope Flag, and Up/Down.
Qualified GPS Antenna
This antenna must meet the following requirements:
DO-160C Environmental Conditions
1.
The antenna shall meet the environmental conditions listed below and shall conform to the test
requirements of RTCA DO-160C.
Environmental Condition
Temperature (operating)
(ground survival)
Altitude
Temperature Variation
Humidity
Vibration
Waterproofness
Fluids
Lightning
Icing
GIA 63/GIA 63W Installation Manual
190-00303-05
Category Description
F2 -55 to +70
F2 -55 to +85
F2 55,000 feet
o
A 10 C per minute
C 95% at +55
CLMY Turbo/Reciprocating/Helicopter
S Continuous Stream
F Deicing Fluid
2A Direct Effects
C 0.15" thick
o
C
o
C
o
C
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