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between 1 and 4.
Figure3 8-22. BlockA ddresSrrraEpr mr Messages
Blocka ddresasn dt rapd ataa red isplayeodn t her ight
halfo f the h4FDC SSf ormatw hent herei s at leasto ne
blocko f datat o be reportedA. s a maximumo, nly the
last 15 block-addresasn dt rap reportsw ill be retained
by thisf unctionD. isplaysa res electeads follows:
1. Select CSS format on any MFD by pressing
FAULT pushbuttono n OBC basic format, and
thenp ressingC SSp ushbuttono n MAINT CURRENT
FAILURES format.
2. PressN EXT pushbuttonto displayn ext datar eport.
T hen umbeor fblock-addres&apre portsin -
dicates if any additional reports of data are
availablefo r displaya nd is decrementeudp on
eachd epressioonf NEXT pushbuttonN. otet hat
block-address/tradpa ta-wordsfi eld will display
last selectebdl ocko f data,i f any,w henf ormati s
tirst displayedR. epeat his stepa s necessartyo
displaye achr eport.
3. PressC LR pushbuttonto cleara nyd atar eports.
This action inhibits display of any remaining
reportsa ndr esetst he numbero f block-address!
trapr eportsto zero.
Them essagessh owni n Figure3 8-22a red isplayed
in the computemr essagaer eao f the RIO MFD in m
spouseto invalidb locka ddresosr trap operations.
30.5 RADAR SYSTEM BUILT-IN TEST
Radars ystemB IT detectsA N/APG-71r adars ystem
hardwarefa ultsa ndp rovidesa ssessmeonft tacticarl adarm
odea vailabilityB. IT hasf our majorc apabilities:
1. Fault detectionu ses computer-controlleda nd
RIO-initiatedte stst o detecfta iluresin flight or on
the deck.
2. Faulti solationa llowsi solationo f a detecteds ystemf
ailureb y indicatingD P andt hes uspecWt IU
or group of WlWs.
3. DMA providesa passf,a il, or degradeedv aluation
of theo perationaml odes.
4. CM automaticallpyr ovidesth e RIO with a warning
when system failures occur during tactical
modes.
38.39 ORIGINAL
NAVAIR Ol-FIWAD-1
Figure 38-23. DD Radar Warning Maltese Cross
BlT provides indication of AN/ARC-7 1 radar thnctional
statusfo r gmund-leveml aintenancae nda irborneo pemtion.
Prior t0 aircrafte mpl~yrnen~o r following ana irbornem ission.
tbeeroundcrewcauexecuteBlTtodekrmineradarset
stat& CtTkctivemaintenauceactionmmmen~onsare
provided on the maintenance display. This display indicates
the detected hardware failure(s) along with replacementr
ecommendationfso r associateWd RA(s).
During tactical operation, the RIO will be alerted to
any anomalies that will impact radar or aircraft operation.
A Maltese cross is displayed in the lower left-hand
quadrant of the DD if the radar has failed and/or the
transmitter is not radiating (except in sniff mode). The
Maltese cross is also displayed when the radar is in
standby or during initiated display test (Figure 38-23).
The cross is not tied to the WOW switch, and will not
be displayed solely for a WOW condition. Radar
anomalies will appear in the lower left quadrant of the
TID as two-charactear cronyms.A ircraft anomaliesw ill
appear on tbe TID as three&amcter acronyms, displayed
below the radar acronyms. Acronyms will be displayed
continuously while the ihihue condition exists. Ifmultiple
failureso ccur,t he appropriatea cronymsw ill be automatically
cycled at a 2-second rate. More detailed failure
information is available on the continuous monitor
maintenance display. The RIO can initiate BIT at any
time to confirm that hardware status is unchanged,
38.5.1 BIT Modes. BIT allows the flightcrew to
quickly assessra dar set status,i dentify hardwaref aults,
and take the corrective action.T his assessmenitn cludes
a radar conhdence test, verification of controls and displays
functionality, and, as necessaryc, onfirmation that
the television camera set is operational.
The following BIT modes are available:
1. Operational readiness test
2. Computer and displays mode test
3. Initiated radar test
4. Initiated displays test
5. Television camera set test
6. Digital display built-in self-test
7. Initiated special test
8. Test-target BIT
9. Continuous monitoring.
ORIGINAL 3840
38.5.1.1 Operational Readiness lest. ORT is
automatically initiated when aircraft power is applied to
the radar, with the sensor hand control in either STBY
or KMIT or if a radar power interruption occurs for
longer than 2.65 seconds. This radar confidence teat
includes tests of radar computers, RF subsystems, system
interfaces, and target detection capability. ORT requires
nominally 3.5 minutes to complete (including 3
minutes for transmitter warmup), but could take as long
　
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