3. The on command test GO/NO-GO self test can
be initiated any time the FDLS page is dis-
played. It is not necessary to wait for an FDLS
error message to be displayed before pressing
the FDLS FAB to display the FDLS page. The
GO/NO-GO self test is comprised of the follow-
ing internal tests:
a. PROM Check sum verification.
b. RAM read/write test.
c. Limited non-volatile memory retention
d. Display hardware BIT.
e. 1553B terminal BIT.
4. Initiate the On Command test as follows:
a. TEST Press. Observe that DNS SYSTEM
TEST IN PROG is displayed until the test is
complete and data is available for DNS test
status. The GO or NO-GO status is then dis-
played. The following is a list of possible
(1) PITCH/ROLL FAIL
(2) HDG or A.C. REF FAIL
(3) SDCC PWR SUPPLY FAIL
(4) SDCC CPU/MEMORY FAIL
(5) SDCC WRAPAROUND FAIL
(6) SDCC A/D FAIL
(7) SDCC 1553 I/O FAIL
(8) SDC FAIL
(9) RTA FAIL
(10) SDCC CMD FAIL
If no failures are detected, the CDU displays the
FDLS page as shown in figure 3-24.
CDU / DNS GO
END OF TEST
FDLS Status Page On-Command
The heading, pitch and roll values are calcu-
lated and displayed no more than five sec-
onds after the GO message.
b. NAV FAB Press. Observe that the NAV top
level present position page is displayed.
3.15.6 Stopping Procedures.
1. ADMIN Press. Observe that the ADMIN page
2. PWR ON Press. Observe that PWR ON
changes to PWR OFF.
3.16 INTEGRATED NAVIGATION SYSTEM
The integrated navigation system
(EGI) does not meet US ARMY require-
ments to fly FAA approved GPS ap-
All data contained paragraph 3.16
through paragraph 3.16.15 is applica-
FCC software only.
The Integrated Navigation System is a software module in
the FCC that uses data from all of the navigation sensors.
The data for the Navigation System comes from the Em-
bedded GPS Inertial (EGI) sensor, a fivechannel GPS re-
ceiver, the AN/ASN137 Doppler Navigation System, the
Heading Attitude Reference System and the Fire Control
Computer. The Navigation System software resides in the
FCC only. In the event of an FCC failure, the helicopter will
automatically configure to the NonIntegrated Navigation
System as described in paragraph 3.14, with the BBC as
the bus controller.