UNCONTROLLED COPY WHEN DOWNLOADED OR PRINTED
ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL SUPPLEMENT 1
Rev.
5
7-10
Apr
15/15
20) Configure EHS Page with the following parameters:
EHS
PAGE
Notes
EHS
DISABLE
4-1-6. GTX Test – Regulatory Test
A. Perform the following required regulatory tests every 24 calendar months, or any time the
transponder is removed or replaced. (A Mode S transponder ramp tester such as an
Aeroflex IFR-6000 or TIC TR-220 is required for the tests.) The transponder should be
operating in normal mode.
1) Altitude Reporting Equipment Test in accordance with 14 CFR Part 91.411 and Part
43 Appendix E.
2) ATC Transponder Tests and Inspections in accordance with 14 CFR Part 91.413 and
Part 43 Appendix F.
4-1-7. GTX Test – ADS-B Out Test
A. Ensure the aircraft is in a location where a GPS signal can be received.
B. Power on the aircraft/avionics and ensure that the GTX is powered on.
C. Ensure the ADS-B TX is selected ON.
D. Temporarily put the GTX into airborne mode as follows:
1) If the GTX squat switch input (P3301-17) is connected, raise the collective up to
simulate an airborne condition.
2) If the GTX squat switch input (P3301-17) is not connected, temporarily configure this
input such that the sensed data is airborne:
a. Start the GTX in configuration mode (hold the OFF key to power down the unit,
then hold the FUNC key and press the ON key).
b. Press the FUNC key until the “SQUAT SWITCH?” page is displayed. Then use
the CRSR and 8/9 keys to change the setting to “YES” and the “SENSE” to “LOW.”
Press the CRSR key until no fields are highlighted to save the changes.
c. Restart the GTX in normal mode.
E. Ensure the GPS source being checked has acquired a position.
F. Select ALT mode on the GTX.
G. Using the transponder test set (such as an Aeroflex IRF-6000), verify the following ADS-
B Out parameters are being transmitted:
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