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ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 1
Rev.
2
3-5
Dec
8/08
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 Form F-511-5, Basic
Weight and Balance Record, as required (reference
Enstrom F-28F/280F Series Maintenance Manual).
4-1. GNS
430W/530W
4-1-1. Removal – GNS 430W/530W
A. Turn the 430W/530W and aircraft power off. Pull the COMM GPS or
COMM/NAV GPS and the COMM TX circuit breakers out. Disable the circuit breaker by
installing a cable tie or other similar device around the circuit breaker system.
B. To remove the 430W/530W unit from the mounting rack, insert a 3/32-inch hex
drive tool into the access hole at the bottom of the unit face. Rotate the hex tool
counterclockwise until the unit is forced out about 3/8 inch and can be freely pulled from
the rack.
C. Slide the unit out of the tray.
4-1-2. Inspection/Repair – GNS 430W/530W
A. Inspect the condition and security of the mounting bracket and electrical
interface.
B. Inspect the condition and security of electrical cables.
C. Repair procedures are not available for the 430W/530W unit.
4-1-3. Installation – GNS 430W/530W
A. The 430W/530W unit is installed in the rack by sliding it straight in until it stops,
about 1 inch short of the final position. Insert the hex drive tool into the access hole at the
bottom of the unit face. Rotate the hex tool clockwise while pressing on the left side of the
bezel until the unit is firmly seated in the rack.
B. Remove the cable tie or other similar device from the COMM GPS or
COMM/NAV GPS and the COMM TX circuit breaker stems and push the stem in to set
the circuit breaker.
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