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34-48-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
LOW RANGE RADIO ALTIMETER SYSTEM - ADJUSTMENT/TEST
__________________________________________________
1. General_______
A. This subject has one task. The task is an operational test of the low range radio altimeter (LRRA) system.
TASK 34-48-00-715-001
2. Operational Test - LRRA System______________________________
A. General
(1) This procedure is a ground test of each LRRA system . You use the self-test switch on the height indicators (HIs) to start the tests. While the ground test operates, you monitor the radio altitude indications on the HIs.
B. References
(1)
21-58-00/501, Equipment Cooling System
(2)
24-22-00/201, Manual Control
C. Access
(1) Location Zone
101,102 Control Cabin
D. Prepare to do the Operational Test
S 865-002
(1)
Supply electrical power (Ref 24-22-00/201).
S 865-003
(2)
Operate the equipment cooling system (Ref 21-58-00/501).
S 865-004
(3)
Make sure these circuit breakers are closed:
(a)
P18 Load Control Center - Left
1) RADIO ALTM-1
(b)
P6 Load Control Center - Right
1) RADIO ALTM-2
(4)
Make sure the captain's height indicator shows -3(|3) feet.
S 865-048
(5)
Make sure you do not see the warning flag on the captain's height indicator.
(6)
Make sure the first officer's height indicator shows -3(|3) feet.
S 865-056
(7)
Make sure you do not see the warning flag on the first officer's height indicator.
S 865-047
S 865-055
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITHOUT EFIS ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 865-024
(8) Set the decision height (DH) cursor on the captain's height indicator to the lowest possible altitude (zero or below, or carefully to the lower mechanical stop of the cursor).
(a)
Make sure the captain's DH light(s) go off.
(b)
If the DH lights do not go off, open and then close the RADIO ALTM-1 circuit breaker.
S 865-025
(9) Set the decision height (DH) cursor on the first officer's height indicator to the lowest possible altitude (zero or below, or carefully to the lower mechanical stop of the cursor).
(a)
Make sure the first officer's DH light(s) go off.
(b)
If the DH lights do not go off, open and then close the RADIO ALTM-2 circuit breaker.
E. Self-Test for the Captain's Radio Altimeter System
S 715-006
(1) Use the captain's height indicator to do the operational test for the captain's radio altimeter system:
(a)
Push and hold the self-test button. 1) Make sure the DH light(s) go off. 2) Make sure the altitude pointer shows the self-test altitude
of 40(|2) feet. 3) Make sure the warning flag is in view.
(b)
Turn the cursor (index) control knob to increase the DH alert altitude. 1) Make sure the DH light(s) come on when the DH cursor
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