FD/LS OPERATION GENERAL (cont)
Control/switch position changes prompted by
FD/LS must be performed within 30 seconds
of prompt or false NO-GO message is
The FD/LS message on the HOD changes
within 2 seconds after responding to a prompt
(3) Prompts and advisory messages are displayed on
the HOD when specific interactive operator actions are
required. These messages direct the operator to perform
operations required by the systems tests.
(4) Test-in-progress messages are automatically
displayed on the HOD to inform operators that a specific test
requires additional time to complete.
(5) The operator is prompted through each test, until all
tests are completed.
(6) The operator has the option to pass or abort any
test and continue forward to the next test during the ETE
check. Pressing and releasing the ENTER SPACE key on the
DEK (ADC) or SPC key on the CDU (ADD) executes the
(7) The pass/abort mode during the ETE check is
inhibited only if a prompt or advisory message is displayed.
e. Boresight Corrector FD/LS Display for GUN, PYLON,
TADS (target acquisition designation sight), and PNVS (pilot
night vision sensor).
The loss or significant reduction in the FCC
battery voltage could cause loss of all data in
random access memory (RAM), including
boresight correctors. If FCC battery voltage is
suspect, refer to TM 9-1230-476-20-2 (ACY). If
FCC LOAD (ACZ) or FCC LOAD FAIL, BST
DATA LOAD FAIL, INIT DATA LOAD FAIL
(ADD) message appears, perform boresight
editing procedures TM 9-1230-476-20-1.
(1) FD/LS provides checksum error checking of the
boresight correctors for GUN, PYLONS, TADS, and PNVS in
both the continuous and maintenance modes. Arithmetic
checking takes place during program execution of the software
to prevent unexpected changes or alterations to this data which
could cause gross errors in pointing/aiming of these systems.