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2.4.1.2 POST-INSTALLATION CHECKOUT/OPERATION
(1)
General
Installation of the MMDR system requires three stages of testing to ensure
the proper operation of the MMDR. Initially, prior to the installation of the
MMDR and antenna, a system interwiring check should be performed. This
check verifies that the aircraft and all MMDR interconnections are correct
before power is applied. After the units are installed a visual inspection of
the equipment and connections is made. Finally, a ramp test is performed.
(2)
System Interwiring Check
To check the aircraft and MMDR system interconnections proceed as fol-
lows:
(a)
(b)
(c)
(3)
Visual Inspection
In conjunction with system installation, perform the inspection/check proce-
dure
(TABLE 2-5 INSPECTION/CHECK
(4)
Post-Installation Test (Nav/Com Functionality)
Perform a ground check of the installation prior to the flight test. Using a lo-
cal frequency, confirm that the COM function can receive and transmit a
modulated signal. Using a ramp tester, confirm that VOR, LOC, and GS
needle deflections move in the correct direction, the To/From flag is the
proper sense, and that the warning flags are functioning properly. An oper-
ation performance flight test is recommended after the installation is com-
pleted to insure satisfactory performance of the equipment in its normal en-
vironment. Check all aircraft control movements to be sure no electrical ca-
bles interfere with their operation.
To check the communications transceiver, maintain an altitude of at least
1500 feet and contact a ground station facility at a range of at least fifty nau-
tical miles. Contact a ground station close in. Pull the volume control knob
out to defeat the automatic squelch feature and listen for any unusual elec-
trical noise which would reduce the COM receiver sensitivity by increasing
the squelch threshold. If possible, verify the communications capability on
both the high and low end of the VHF COM band.
Rev. 0, Aug/2006
©Honeywell International Inc. Do not print without express permission of Honeywell
Check that all cables and interwiring are installed in accordance with
the Interwiring and Cable Harness Fabrication instructions (para-
graph
2.3.5.1 KTR 2280 INTERCONNECTION AND CABLE HAR-
NESS
FABRICATION).
Using the applicable interconnection information, check wiring for
proper destination, opens, and shorts.
Check rf cables for insertion loss and VSWR.
KTR 2280 Preliminary H 08/17/06
PROCEDURE).
Page 2-30
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