2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 31-50-00-710-001 Ground Scanning of the Central Warning System
AMM 36-11-34-000-001 Removal of the BMC (1HA1, 1HA2)
AMM 36-11-34-400-001 Installation of the BMC (1HA1, 1HA2)
ASM 36-11/03
3. Fault Confirmation
__________________
A. Make sure that this(these) circuit breaker(s) is(are) closed:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR BLEED/ENG 1/CTL 3HA1 D12 49VU AIR BLEED/ENG 1/MONG 2HA1 D11 122VU AIR BLEED/ENG 2/CTL 3HA2 Z23 122VU AIR BLEED/ENG 2/MONG 2HA2 Z22
B. Test Do the operational test of the central warning systems (SDAC) (Ref. AMM TASK 31-50-00-710-001).
4. Fault Isolation
_______________
A. If the test gives the maintenance messages :
SDAC1: NO DATA FROM BMC 1+2
or
SDAC2: NO DATA FROM BMC 1+2
-replace the BMC-1 (1HA1) and the BMC-2 (1HA2) (Ref. AMM TASK 36-11-34-000-001) and (Ref. AMM TASK 36-11-34-400-001).
1
-EFF : ALL
-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page B202
--Feb 01/05R ---CES -
(1) If the fault continues:
-do a check and repair: . the wiring of the ARINC 429 OUTPUT SIGNAL from the BMC1 (1HA1) pins AA/10C, 11C, 12 to the first terminal block . the wiring of the arinc 429 OUTPUT SIGNAL from the BMC2 (1HA2) pins AA/10C, 11C, 12 to the first terminal block (Ref. ASM 36-11/03).
B. Do the test given in para. 3.
1
-EFF : ALL
-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page B203
--Feb 01/05R ---CES -
Loss of the Bleed Regulated-Pressure Transducer of the Engine 1 (Detected by BMC2)
1. Possible Causes
_______________
-XDCR-BLEED REGULATED PRESS, ENG 1 (8HA1)
-BMC-2 (1HA2)
-
wiring between pin A/2 of the bleed regulated-pressure transducer (8HA1) and the ground terminal
-
wiring between pin A/1 of the bleed regulated-pressure transducer (8HA1) and the circuit breaker (2HA1)
-
wiring from the bleed regulated-pressure transducer (8HA1) to the BMC1 (1HA1)
-
wiring from pin A/1 of the bleed regulated-pressure transducer (8HA1) to the circuit breaker (2HA1)
-C/B-BMC 1 (2HA1)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 36-11-16-000-001 Removal of the Bleed Regulated Pressure Transducer (8HA1,8HA2) AMM 36-11-16-400-001 Installation of the Bleed Regulated Pressure
Transducer (8HA1,8HA2) AMM 36-11-34-000-001 Removal of the BMC (1HA1, 1HA2) AMM 36-11-34-400-001 Installation of the BMC (1HA1, 1HA2) ASM 36-11/01
3. Fault Confirmation
__________________
A. Test
(1) Not Applicable
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR BLEED/ENG 1/MONG 2HA1 D11
1
-EFF : ALL
-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page B204
--Feb 01/05R ---CES -
B. If the fault symptom is identified by the maintenance message: REG-PRESS XDCR 8HA1
-do a check of the status of the circuit breaker (2HA1):
(1) If the circuit breaker is closed:
-do a check for 28VDC at pin A/1 of the bleed regulated-pressure transducer (8HA1) (Ref. ASM 36-11/01).
(a) If there is no 28VDC:
-do a check for ground at pin A/2 of the bleed regulated-pressure transducer (8HA1).
1_ If there is no ground signal:
- repair the wiring between pin A/2 of the bleed
regulated-pressure transducer (8HA1) and the ground
terminal.
2 If there is a ground signal:
_
-do a check of the wiring between pin A/1 of the bleed regulated-pressure transducer (8HA1) and the circuit breaker (2HA1).
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