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4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR BLEED/ENG 1/CTL 3HA1 D12 49VU AIR BLEED/ENG 1/MONG 2HA1 D11
B. If the fault symptom is identified by the maintenance message:
PRESS REG-V 4001HA1 OR SOL 10HA1
-do a check of the visual position indicator of the bleed
pressure-regulator valve.
(1)
If the bleed pressure-regulator valve is open:
-replace the VALVE-BLEED PRESS REG (4001HA) (Ref. AMM TASK 36-11-52-000-040) and (Ref. AMM TASK 36-11-52-400-040).
(2)
If the bleed pressure-regulator valve is closed:
-make sure that the indication of the valve position on the lower ECAM display unit is correct when you manually operate the valve shaft.
(a) If the indication does not agree with the position of the valve butterfly:
1 Do a check and repair the wiring between the bleed pressure
_ regulator-valve (4001HA) to the BMC1 (1HA1), pin A/5 to pin AA/2B (Ref. ASM 36-11/01).
2 If the fault continues:
_
-replace the BMC-1 (1HA1) (Ref. AMM TASK 36-11-34-000-001) and (Ref. AMM TASK 36-11-34-400-001).
(b) If the fault continues:
-release the ENG 1 BLEED pushbutton switch
-make sure that the bleed pressure-regulator valve control-solenoid (10HA1) makes clicks.
1 If the solenoid makes clicks:
_
-do a check and clean the sense line between the bleed pressure-regulator valve control-solenoid (10HA1) and the bleed pressure-regulator valve (4001HA).
a If the fault continues:
_
-replace the VALVE-BLEED PRESS REG (4001HA).
b If the fault continues:
_
-replace the SOLENOID-BLEED PRESS REG V CTL, ENG 1 (10HA1) (Ref. AMM TASK 36-11-55-000-001) and (Ref. AMM TASK 36-11-55-400-001).
1
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2_ If the solenoid does not make clicks:
- do a check for 28VDC at pin A/1 of the connector of the
bleed pressure-regulator valve control-solenoid (10HA1) with
the ENG 1 BLEED pushbutton switch (4HA1) released (OFF
legend on) and the circuit breaker (2HA1) open.
a If there is 28VDC:
_
-do a check for ground at pin A/3 of the connector of the bleed pressure-regulator valve control-solenoid (10HA1).
If there is no ground signal:
* replace the SOLENOID-BLEED PRESS REG V CTL, ENG 1 (10HA1).
b If there is no 28VDC:
_
-do a check for 28VDC at pin A/D2 of the ENG 1 BLEED pushbutton switch (4HA1). . If there is 28VDC:
*
do a check and repair the wiring from the connector of the bleed pressure-regulator valve control-solenoid to the control-solenoid to the ENG 1 BLEED pushbutton switch, pin A/1 to pin A/D3.
If the fault continues:
*
replace the P/BSW-ENG 1 BLEED (4HA1). . If there is no 28VDC:
*
replace the circuit breaker (3HA1).
If the fault continues: 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 PNEUMATIC(40)
