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the MASTER TEST panel (Figure 38-3) on the right
outboard console. These tests check the operational
status of specific aircrafi systems basic to safety of flight
andm ission successT. he OBC, WG SWP, FLT GRIP,
and FLT GR DN positions are used on the deck only and
are prevented from inadvertent use in flight by the
weight-on-wheels safety switches. The remaining tests,
except for emergency generator, which also requires
combined hydraulic pressure, can be done whenever
electricalpower andcoolingairare available.For details
of specific aircraft systems tests, refer to the applicable
system description.
During ground operations,o ncet he OBC position
is selected, do not deselect OBC until
the program has completed the entire cycle.
When the disable signal, which inhibits
throttle movement, is removed, the APC will
run through its BIT and advance the throttles
to greater than 80 percent.
Note
l Before startingt he test,d epresst he MASTER
RESET button on the left vertical
console to turn off any caution or advisory
lights associated with the air data
computer.
l In LTS, the MASTER CAUTION light
will flash unless there is a circuit failure
within the caution advisory indicator, in
which case the light will be steady.
38-l ORIGINAL
NAVAIR Of-Fl4AAD-I
A”lONlcs CONTROLS
AND STATUS
DWLAYS
WILOTS CENTER & RIGHT. RIO,
MASTER CAVTION PANEL
-I
r------
/
AVlONlCS /
/
/
/
,
/
I /
I ,
/
/
/ RADAR CONTROLS
/ AND STATUS DISPLAYS
,
/ /’
ORIGINAL
Figure 38-1. On-Board Checkout
38-2
NAVAIR Ol-Fl4AAD-1
NAME
Master Test Checks
Onboard Checkout (OBC)
Sequences
Continuous Monitor
Unit/Subsystem Self-test
Data Bus Tests
ORIGINATOR
PILOT
PURPOSE
Selectable tests of instruments, fuel system, warning
system (lights), wingsweep, AOA
PILOT and RIO Tests various avionics, flight controls, actuators,
AICS, and computers
AUTOMATIC Monitors majority of avionics and radar functions for
in-flight or on-deck failures. Typically performed
every 2 seconds
PILOT and RIO Independent testing of individual, or groups of
functionally related subsystems
AUTOMATIC Tests each data bus channel for each bussed
subsystem
AUTOMATIC Tests the compatibility of subsystem software
program loads
Figure 38-2. Test Types
38.2.1 MASTER TEST Switch Operation. The
master test check is made by pulling the knob up, rotating
to tbe desired position, and depressing it. After the
test is completed, the MASTER TEST switch must be
pulled up and deselectedt o deenergizet he system.
Cycling the CID circuit breakers (3E7,4El,
and 4E2) with the MASTER TEST switch in
or above the OBC position will cause the
AFCS BIT sequence to initiate. AFCS BIT
sequence tests and deflects various aircmfi
control surfaces, which could be a hazard to
unsuspecting ground personnel:
System status and test results are indicated on the
cockpit instruments: GO-NO GO lights on the master
test panel; warning, caution, and advisory lights in both
cockpits; and displays including MFDs and TlD
The GO-NO GG indicator lights on the MASTER
TEST panel will illuminate only in LTS, FIRE
DET/EXT, EMERG GEN, and FLT GR Up. In the LTS
test position, only the bulbs in the GO-NO GO indicators
are. checked. In EMERG GEN, FIRE DET/EXT, and
FLT GR UP, a GO light indicates a valid test and a NO
GG light indicates an unsatisfactory test. The STICK
SW utilizes only the GO light; therefore, a valid test in
STICK SW is indicated by a GO light but the lack of a
light indicates an unsatisfactory test.
Electrical power for the master test panel comes Born
the left main dc bus through the MASTER TEST circuit
breaker (9H4) on the DC MAIN circuit breaker panel.
When operating on aircraft power or when external electrical
power is connectedt o the aircra-dcfto, oling air must
be supplied to all avionic equipment before a test is
initiated.
38.3 ON-BOARD CHECKOUT
OBC checks the opemtional status of the equipment
listedinFigme.384.ItprovidesfaultisolationtotheWRA
level without the use of ground support equipment. The
systema utomaticallym onitorsa ll equipmentp mviding an
initisl, periodic,o r operator-initiatemd ode ofBlT in order
to detect failures or command subsystemsin to test as a
resulto f selectionsm ade with the MFD OBC display formats.
When a test is completed the tested equipment respondsw
　
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