UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 1
Rev.
7
8-4
Aug
28/17
SECTION 4
SYSTEM MAINTENANCE
NOTE
Removal or installation of equipment will change the aircraft empty
weight and empty weight c.g. These changes will be recorded on the
Basic Weight and Balance Record, as required.
4-1. GTN
650
NOTE
All work must be accomplished in accordance with the Enstrom
F-28F/280F Series Maintenance Manual.
4-1-1. Cleaning
A. The GTN displays use a lens coated with a special anti-reflective coating that is very
sensitive to skin oils, waxes, and abrasive cleaners.
Do not use cleaners with ammonia
.
Clean the lens using a clean, lint-free or microfiber cloth and eyeglass lens cleaner that is
specified as safe for anti-reflective coatings. Clean water is also acceptable for cleaning
the front bezel, keypad, and display. Care should be taken to avoid scratching the surface
of the display.
B. Select the Utilities page group from the Home page, then touch Clean Screen key to start
Screen Cleaning Mode. Touch the Home key to exit Screen Cleaning Mode.
4-1-2. Removal
A. Remove power to the GTN 650 unit. Pull the
COM
and
NAV/GPS
circuit breakers out.
Disable the circuit breakers by installing a cable tie or other similar device around each
circuit breaker stem.
B. Insert the 3/32-inch hex drive tool into access hole on the unit face. Rotate the hex tool
counterclockwise until the unit is forced out about 3/8 inch and the hex drive tool
completely stops.
C. Carefully pull the unit from the rack.
4-1-3. Installation
NOTE
Do not use excessive force when inserting the GTN 650 into the rack.
This may damage the connectors, unit, and/or unit rack.
A. Insert the GTN 650 unit into the rack by sliding it straight in until it stops, about 3/8 inch
short of the final position.
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