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Page Title:
Radar Altitude Self -Test Analog and Confidence Signal Test (CRC) |
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 TM 55-4920-430-13
DIGITAL
STEP
CONTROL/SWITCH
VOLTAGE
MULTIMETER/
MEASUREMENT
NO.
NOMENCLATURE
POSITION
NORMAL RESULTS
(2) PITCH
( 2 ) PITCH-HSI
( 2 ) None
(2)
None
switch S26
( 3 ) PITCH ATT-
( 3 ) Rotate
(3) (a) 11.8Vac
( 3 ) J3-P (line)
HSI HDG
to J3-AA
cw to
(b) +11.67 to +11.93
913 to 995
( A C / D C VOLTMETER)
J3-P (line) to
h.
ON
R e s p o n s e TEST
-0.04 to +0.04 Vac
J3 -AA
MODE switch S8
(1) N o n e
( 1 ) RESPONSE
(1) OFF
(1)
None
i.
TEST MODE
switch S8
(2) SIGNAL GND
(2) GND
( 2 ) J3-S (line)
( 2 ) -0.04 to +0.04Vac
switch S27
to J3-AA
NOTE
Set multimeter to read DC Voltage.
( 1 ) -0.05 to +0.05Vdc
( 1 ) J3-Z (line)
3
( 1 ) BARO ALT
to J3-AA
switch S41
(2) +4. 0 to +5.0Vdc
( 2 ) J3-KK (line)
3
( 2 ) BARO ALT
to J3-AA
switch S41
( 3 ) -0.1 to +0.1 Vdc
1
( 3 ) J3-KK (line)
(3) BARO ALT
to J3-AA
switch S41
( 4 ) -0.1 to +0.1Vdc
( 4 ) J3-KK (line)
2
( 4 ) BARO ALT
to J3-AA
switch S41
checks .response to the radar altimeter self-test and validity test signals that are supplied to the AFCS
computer.
a. Set BARO ALT switch to position 3.
b. Connect the digital multimeter, set to measure dc volts, between receptacle 3 pin z (+) and pin
AA. The multimeter shall indicate -.5 to +.5 volt dc.
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