S 735-327
(2) Do the interface test for the right radio altimeter:
(a)
Open these circuit breakers:
1) P7 Overhead Circuit Breaker Panel
a) 7B3 RADIO ALTM L
b) 7B4 RADIO ALTM C
(b)
Set the EIU switch on the captain's source select module to the L position. 1) Make sure the radio altitude shown on the captain's PFD
is -6 |2 feet.
(c)
Set the EIU switch on the captain's source select module to the C position. 1) Make sure the radio altitude shown on the captain's PFD
is -6 |2 feet.
(d)
Set the EIU switch on the captain's source select module to the R position. 1) Make sure the radio altitude shown on the captain's PFD
is -6 |2 feet.
(e)
Push the STAT button on the EICAS Display Panel.
1) Make sure you see RADIO ALT LEFT and RADIO ALT CENTER on the alternate EICAS display.
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747-400 MAINTENANCE MANUAL
2) Make sure RADIO ALTM RIGHT does not show on the alternate EICAS display.
NOTE: Permit 15 seconds to make sure RADIO ALTM RIGHT does
____ not show on the alternate EICAS display.
(f) Close these circuit breakers:
1) P7 Overhead Circuit Breaker Panel
a) 7B3 RADIO ALTM L
b) 7C4 RADIO ALTM C
S 735-328
(3) Do the interface test for the center radio altimeter:
(a)
Open these circuit breakers:
1) P7 Overhead Circuit Breaker Panel
a) 7B3 RADIO ALTM L
b) 7C21 RADIO ALTM R
(b)
Set the EIU switch on the captain's source select module to the L position. 1) Make sure the radio altitude shown on the captain's PFD
is -6 |2 feet.
(c)
Set the EIU switch on the captain's source select module to the C position. 1) Make sure the radio altitude shown on the captain's PFD
is -6 |2 feet.
(d)
Set the EIU switch on the captain's source select module to the R position. 1) Make sure the radio altitude shown on the captain's PFD
is -6 |2 feet.
(e)
Push the STAT button on the EICAS Display Panel. 1) Make sure you see the RADIO ALT LEFT and RADIO ALT RIGHT indications on the alternate EICAS display.
2) Make sure RADIO ALTM CENTER does not show on the alternate EICAS display.
NOTE: Permit 15 seconds to make sure RADIO ALTM CENTER
____ does not show on the alternate EICAS display.
(f) Set the test enable switch on the aft overhead maintenance panel (P461) to the ENABLE position.
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747-400 MAINTENANCE MANUAL
(g) Close these circuit breakers:
1) P7 Overhead Circuit Breaker Panel a) 7B3 RADIO ALTM L b) 7C21 RADIO ALTM R
G. Put the Airplane in its Usual Condition
S 865-306
(1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
TASK 34-33-00-745-299
4. BITE Test - Radio Altimeter Receiver-Transmitter________________________________________________
A. General
(1) This procedure does a test of each receiver-transmitter (R/T) and its antennas by use of the TEST button at the R/T. Operation of other navigation and control systems on the airplane is not necessary.
B. References
(1)
AMM 06-09-02/201, Body Section 42 Access Doors and Panels
(2)
AMM 24-22-00/201, Manual Control
C. Access
(1)
Location Zones 125 Area Below Forward Lower Lobe Compartment, Left 221 Control Cabin, Left
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