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as 7 to 8 minutes if radar functions are degraded.W hen
ORT has completed, the DMA display is automatically
displayed on the TID and the BIT menu will appear on
the DD (see Figure 38-24). The DMA algorithm provides
an evaluation of the working status of tactical
modes. If additional information is required, the maintenance
display can be selected from the BIT menu
At the completion of ORT, the following tests can be
selected from the BIT menu on the DD: radar test, displays
test, television camera set test, special test, or test
target. If no further testing is required, a tactical mode
can be entered directly by selecting the DD pushtile for
the desired mode.
IfORT is running when a tactical situation arises, the
RIO can abort ORT by pushing the PGM RST button in
the lower right comer of the DD. ORT abort is not
recognizedu ntil aftert he initialization phasei s complete
(5 secondso r less).T o reportt hat ORT hasb eena borted,
the CM acronym OA is displayed in the lower left position
of the TID and the event is recorded in the failure
history tile. The system will transition to 5-mn pulse
search. The 3-minute transmitter warmup period will,
however, still be in effect. This means that the system
capabilities will be limited to a nonradiation mode until
warmup is complete. The system may have some performance
degradation because of insufficient calibrations.
These calibrations are normally executed during
the ORT sequence.P ossible radar performance degradations
are as follows:
1. LPRP
a. Short p&e - Up to SOO-foorta nge bias.
b. Pulse compression -Up to 2-nm range bias.
2. HPRF - RWS and PDS perform as requited.
3. RAM -RAM accuracy may be degraded.
4. PDSTTlRGSTT -Noise jammer problem will occur
fust time until periodic calibrations are performed.
These calibrations shall be performed
within 5 minutes of the exist or ORT.
NAVAIR WF14AAD-1
38.5.1.2 Computer and Displays Mode Test.
CDM is automatically initiated when aircraft power is
applied to the radar with the SHC in CMPTR. CDM is
interruptible by pressing the PGM RST pushtile on the
DD. This radar confidence test includes a subset of the
tests performed during ORT. It differs t?om ORT in that
the antennah ydraulics andt ransmitters ubsystema ren ot
tested. CDM requires, nominally, 2.5 minutes to complete
(the 3-minute transmitter warmup delay is not required).
At the completion of CDM, the degraded mode
assessment display is automatically displayed on the
TID, and the BIT menu will appear on the DD. The
DMA algorithm will give an evaluation of the working
status of tactical modes. If additional information is required,
t he maintenanced isplay canb e selectedf rom the
BIT menu.
At the completion of CDM, the following tests can
be selected from the DD BIT menu: radar test, displays
test, television camera set test, special test, or test target.
if no further testing is required, a tactical mode can be
entered directly by selecting the DD pushtile for the
desired mode.
38.5.1.3 Initiated BIT. TheIBITmodecontainsfive
submodes: radar BIT, displays BIT, television camera
set BIT, digital display built-in self-test, and special tests
BIT.
38.5.1.3.1 Radar BIT. Initiated radar test (RDR) allows
retest of the radar system. If the SHC is in either
STBY or KMIT, radar BIT will be the same as ORT
(with the exception that the 3-minute transmitter
warmup delay is not required). Consequently, radar
BIT executiontimeisshorter. IftheSHCisinCMPTR,
radar BIT will be the same as CDM.
Radar BIT is initiated by depressing the MFK
pushtile on the DD to obtain the radar modes menu,
selecting the pushtile adjacent to BIT to obtain the BIT
submenu, and then depressing the pushtile adjacent to
RDR on the BIT menu. Test execution requires approximately
2.0 minutes, and is interruptible by a program
restart( depressingP GM RST pushtile on the DD), @
other BIT selection, or a radar mode selection.
38.5.1.3.2 Displays BIT. DISP is a controls and
displays subsystemc onfidence check.T he TID and DD
display a predefmed set of static and dynamic symbology
for evaluation of symbol intensity, completeness,
contrast, and motion. Displays BIT symbology is dependent
on the TID mode switch setting and DD keypad
entry. The RIO must confm visually that this subsystem
is functioning properly.
38-41 ORIGINAL
NAVAIR Ol-FWIAD-1
ORT ABORT
ACRONYM
‘ME OF
,lRRENCF
FHF WRA Oc’-~~~~-~~--
ASCII
STRING
\ ORT ABORT
INDICATION
ORIGINAL
　
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