34-48-21

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A
737-300/400/500MAINTENANCE MANUAL
 S 024-003
 (2)  Remove the LRRA R/T:
 (a)  
Loosen the knurled nut that holds the R/T on the rack.

 (b)  
Pull the R/T off the rack to disengage the electrical connector.

 (c)  
Remove the R/T.

 TASK 34-48-21-404-004
 3.  LRRA Receiver-Transmitter Installation______________________________________
 A.  References
 (1)  
34-48-00/501, Low Range Radio Altimeter System

 (2)  
34-48-03/501, Low Range Radio Altimeter System

 (3)  
78-31-00/501, Thrust Reverser System

 B.  Access
 (1)  Location Zone
 205 Electronics Compartment

 C.  Procedure
 S 864-005
 (1)  Make sure the applicable circuit breaker is open:
 (a)  
P18 Circuit Breaker Panel
 1) RADIO ALTM-1

 (b)  
P6 Circuit Breaker Panel
 1) RADIO ALTM-2

 S 424-006
 (2)  Install the LRRA R/T:
 (a)  
Carefully push the R/T on the rack

 1)  Make sure the pins on the rear of the R/T engage with the electrical connector on the shelf.

 (b)  
Tighten the knurled clamp nut.

 S 864-007
 (3)  Remove the DO-NOT-CLOSE tag and close the applicable circuit breaker:
 (a)  P18 Load Control Center - Left
 1) RADIO ALTM-1

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737-300/400/500MAINTENANCE MANUAL
 (b)  P6 Load Control Center - Right
 1) RADIO ALTM-2

 S 714-016
 (4)  Do the applicable LRRA Operational Test: AMM 34-48-00/501 - AIRLANES WITHOUT EFIS. AMM 34-48-03/501 - AIRPLANES WITH EFIS AND BENDIX RADIO ALTIMETERS.
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737-300/400/500MAINTENANCE MANUAL
 LRRA HEIGHT INDICATOR - REMOVAL/INSTALLATION
____________________________________________
 1.  General_______
 A.  This subject has two tasks, a removal and an installation of the height indicator for the low range radio altimeter system (LRRA).
 B.  A height indicator is installed on each pilots' instrument panel.
 TASK 34-48-31-004-001
 2.  Height Indicator Removal________________________
 A.  Access
 (1)  Loacation Zone
 101,102 Control Cabin

 B.  Procedure
 S 864-009
 CAUTION:_______OPEN THE CIRCUIT BREAKERS THAT FOLLOW. IF YOU DO NOT OPEN THE CIRCUIT BREAKERS, YOU CAN CAUSE DAMAGE TO THE HEIGHT INDICATOR.
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 NOTE: Open the ALTM-1 circuit breaker when it is necessary to
____ remove the LRRA-1 height indicator. Open the ALTM-2 circuit breaker to remove the LRRA-2 height indicator.
 (a)  
P18 Load Control Center - Left
 1) RADIO ALTM-1

 (b)  
P6 Load Control Center - Right
 1) RADIO ALTM-2

 S 024-003
 (2)  Remove the height indicator:
 (a) Remove the height indicator from the instrument panel.
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