(2) Do the BITE test of the radio altimeter (Ref. AMM TASK 34-42-00-740-002).

 - If the BITE test is not possible, refer to Para. 4. B. of this trouble shooting procedure.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞34-42-00∞∞∞∞∞∞∞∞∞∞Page 204
 Nov 01/98R
 CES

 4. Fault Isolation
_______________

R
 A. If the circuit breaker (1SA2) is closed, and if the BITE test gives the maintenance message LRRA-2 TRANCEIVER.
 - replace the XCVR-RA, 2 (2SA2) (Ref. AMM TASK 34-42-33-000-001) and (Ref. AMM TASK 34-42-33-400-001).
R **ON A/C 001-004,

R Post SB 34-1171 For A/C 001-004,

R A. If the circuit breaker (1SA2) is closed, and if the BITE test gives the
R maintenance message RA 2 (2SA2).
R - replace the XCVR-RA, 2 (2SA2) (Ref. AMM TASK 34-42-33-000-001) and
R (Ref. AMM TASK 34-42-33-400-001).

 **ON A/C ALL
 B. If the circuit breaker (1SA2) is closed and if the BITE test is not possible
 - do a check for 115VAC at pin AC/8 of the RA transceiver 2.
 (1) If there is no 115VAC:

 - do a check of the wiring of the 115VAC signal from circuit breaker (1SA2) to RA transceiver 2 (2SA2) (Ref. ASM 34-42/02).
 (a) If there is no continuity:

 - repair the above wiring.

 (b) If there is continuity:

 - replace the C/B-COM NAV/RAD ALTM/2 (1SA2).

 (2) If there is 115VAC:

 - do a check of the wiring of the ground signal at RA transceiver 2 pin AC/3.
 (a) If there is no continuity:

 - repair the above wiring.

 (b) If there is continuity:

 1 do the trouble shooting procedure (Ref. TASK 31-32-00-810-934)
_
 related to:

 - the output Bus signal ALTITUDE BUS 1 (2) (Ref. ASM 34-42/02).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞34-42-00∞∞∞∞∞∞∞∞∞∞Page 205
 Nov 01/00 CES

 C. If the circuit breaker (1SA2) is open:
 - close this circuit breaker.
 (1) If the circuit breaker (1SA2) trips:
 - remove the XCVR-RA, 2 (2SA2) (Ref. AMM TASK 34-42-33-000-001).

 - close the circuit breaker (1SA2).

 (a) If this circuit breaker stays closed:

 - install the RA transceiver 2 (Ref. AMM TASK 34-42-33-400-001)

 (b) If this circuit breaker trips again:

 1_ If the circuit breaker trips again:
 - replace the RA transceiver 2 (Ref. AMM TASK 34-42-33-000-
001) and (Ref. AMM TASK 34-42-33-400-001).

 - do a check for a short to ground at the wiring between the circuit breaker (1SA2) and the RA transceiver 2 (2SA2). (Ref. ASM 34-42/02).
 1 If there is a short to ground:
_
 - repair the above wiring. 2 If there is no short to ground:

_

 - replace the C/B-COM NAV/RAD ALTM/2. 3 Install the RA transceiver 2

_ (Ref. AMM TASK 34-42-33-400-001).
 D. Do the test given in Para. 3.B.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞34-42-00∞∞∞∞∞∞∞∞∞∞Page 206
 Nov 01/98R
 CES  Loss of the Altitude Bus 1 of the RA Transceiver 1 Identified by the EFCS1 or the EFCS2

 1. Possible Causes
_______________
 - XCVR-RA, 1 (2SA1)

 - wiring of the ALTITUDE BUS 1 from the RA transceiver 1 (2SA1) to the first terminal block

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 27-96-00-740-001 BITE Test of the EFCS (Ground Scanning) AMM 34-42-33-000-001 Removal of the Radio Altimeter Transceiver 2SA1 and 2SA2 AMM 34-42-33-400-001 Installation of the Radio Altimeter Transceiver 2SA1 and 2SA2 ASM 34-42/01
 3. Fault Confirmation
__________________
 A. Make sure that this(these) circuit breaker(s) is(are) closed:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
　
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