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R  - repair the above wiring. 
R  b_  If there is continuity:
R  - replace the circuit breaker (4DD2). 
R  (2) If the circuit breaker is open: 
R  - close the circuit breaker. 
R  (a) If the circuit breaker trips: 
R  - replace the DET-ICE, R (2DD2). 
R  1_  If the fault continues:
R  - do a check for a short to ground at the wiring between pin 
R  A/1 of the R ice detector and the circuit breaker (4DD2). 
R  a_  If there is a short to ground:
R  - repair the related wiring. 
R  b_  If there is no short to ground:
R  - replace the C/B-ANTI ICE/ICE DET/R (4DD2). 
R  (b) If the circuit breaker stays closed and the fault continues: 
R  - replace the DET-ICE, R (2DD2). 
R  C. Do the operational test given in Para. 3.

 

R **ON A/C ALL
 TASK 30-81-00-810-804
 Icing Indicator Lighting Inoperative
 1. Possible Causes
_______________
 - SW-INT LT/STBY COMPASS (2LF)

 - wiring from the circuit breaker (1LF) to the pin 1B of the ICE IND&/STBY COMPASS switch (2LF)

 - wiring from the lighted icing indicator (16DD) to the pin 2B of the ICE IND&/STBY COMPASS switch (2LF)

 - wiring between pin 1 of the lighted icing indicator (16DD) and pin 2B of the IC IND&/STBY COMPASS switch (2LF)

 - wiring between pin 2 of the lighted icing indicator (16DD) and the ground.

 - LED of the lighted icing indicator (16DD)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
ASM 33-13/00
 AWM 30-81-00
 3. Fault Confirmation
__________________
 A. On the INT LT section of the overhead control and indicating panel 25VU, set the ICE IND&/STBY COMPASS switch (2LF) to ON and make sure that the LED of the icing indicator does not come on.
 4. Fault Isolation
_______________
 A. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU LIGHTING/ICE AND STBY/COMP/LIGHT 1LF H04
 「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 ∞∞30-81-00∞∞∞∞∞∞∞∞∞∞Page 208
 Aug 01/05 CES

 B. Make sure that the lighting of the standby compass is operative when the ICE IND&/STBY COMPASS switch (2LF) is in the ON position.
 (1) If the lighting of the standby compass is inoperative, do a check of the circuit breaker (1LF) status.
 (a) If the circuit breaker is closed:
 - do a check for 28VDC at pin 2B of the ICE IND&/STBY COMPASS switch (2LF) (Ref. ASM 33-13/00).
 1 If there is no 28VDC:
_
 - do a check for 28VDC at pin 1B of the ICE IND&/STBY COMPASS switch (2LF) (Ref. ASM 33-13/00).
 a If there is 28VDC:
_
 - replace the SW-INT LT/STBY COMPASS (2LF).
 b If there is no 28VDC:
_
 - do a check and repair the wiring from the circuit breaker (1LF) to the pin 1B of the ICE IND&/STBY COMPASS switch (2LF).
 2 If there is 28VDC:
_
 - do a check and repair the wiring from the lighted icing indicator (16DD) to the pin 2B of the ICE IND&/STBY COMPASS switch (2LF) (Ref. AWM 30-81-00).
 (2) If the lighting of the standby compass is operative:
 (a) Do a check for 28VDC at pin 1 of the lighted icing indicator (16DD)
 - if there is no 28VDC:
 1 Do a check and repair the wiring between pin 1 of the lighted
_ icing indicator (16DD) and pin 2B of the IC IND&/STBY COMPASS switch (2LF)
 - if there is 28VDC:
 2 Do a check for a ground signal at pin 2 of the lighted icing
_
 indicator (16DD)

 a If there is no ground signal:
_
 - do a check and repair the wiring between pin 2 of the lighted icing indicator (16DD) and the ground.
 b If there is a ground signal:
_ - replace the LED of the lighted icing indicator (16DD).
 C. On the INT LT section of the overhead control and indicating panel 25VU, set the ICE IND&/STBY COMPASS switch (2LF) to ON and make sure that the LED of the icing indicator comes on.
　
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