b_ If there is no short to ground: - replace the C/B-ANTI ICE ENG2 CTL SUPPLY (1DN2).
R R (b) If the circuit breaker stays closed and the fault continues: - do the functional test of the sense lines (Ref. AMM TASK 36-11-00-720-007).
R R R 1_ If there are leaks:- repair the defective muscle pressure tubes and hoses (Ref. AMM TASK 30-21-49-210-001).
R 2_ If there is no leak: - replace the VALVE-ENG AIR INTAKE ANTI ICE (4000DN).
C. Do the operational test given in Para. 3.
Failure of the Engine 1 Air Intake Anti-Ice Valve in the Closed Position
1. Possible Causes
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- VALVE-ENG AIR INTAKE ANTI ICE (4000DN)
- P/BSW-AIR INLET ANTI ICE VALVE ENG1 CTL (2DN1)
- wiring between the engine 1 air intake anti-ice valve (4000DN) and the circuit breaker (1DN1)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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R AMM 30-21-00-710-002 Operational Test of the Engine Air Intake Ice
R Protection (with the Engines in operation) AMM 30-21-00-710-003 Operational Test of the NAI Valve AMM 30-21-49-210-001 Visual Inspection of the Anti-Ice System Tubes, Ducts, and Hoses AMM 30-21-51-000-040 Removal of the Engine Air-Intake Anti-Ice Valve (4000DN) AMM 30-21-51-400-041 Installation of the Engine Air-Intake Anti-Ice Valve (4000DN)
3. Fault Confirmation
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R A. Do the operational test of the engine air intake ice protection (Ref. AMM R TASK 30-21-00-710-002).
4. Fault Isolation
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A. Table of the circuit breakers used in this procedure:
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PANEL DESIGNATION IDENT. LOCATION
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122VU ANTI ICE/ENG/1 1DN1 X10
B. If the test confirms the fault:
- do a check of the overpressure indicator on the air intake anti-ice valve (4000DN).
(1) If the overpressure indicator is extended:
- replace the VALVE-ENG AIR INTAKE ANTI ICE (4000DN) (Ref. AMM TASK 30-21-51-000-040) and (Ref. AMM TASK 30-21-51-400-041).
「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 ∞∞30-21-00∞∞∞∞∞∞∞∞∞∞Page 207
May 01/05 CES
R R (2) If the overpressure indicator is not extended: - do the operational test of the NAI valve (Ref. AMM TASK 30-21-00-710-003).
R R R (a) If the NAI valve operates correctly: - do a check of the motive pressure line for correct condition (Ref. AMM TASK 30-21-49-210-001).
R (b) If the fault continues: - do a check of the status of the circuit breaker (1DN1):
1_ If the circuit breaker is closed: - make sure that there is 28VDC at pin A/9 of the engine 1 air intake anti-ice valve (4000DN).
a_ If there is 28VDC: - replace the VALVE-ENG AIR INTAKE ANTI ICE (4000DN) (Ref. AMM TASK 30-21-51-000-040) and (Ref. AMM TASK 30-21-51-400-041).
b_ If there is no 28VDC: - make sure that there is 28VDC at pin A/D2 of the ANTI ICE/ENG 1 pushbutton switch (2DN1). . If there is no 28VDC: - replace the P/BSW-AIR INLET ANTI ICE VALVE ENG1 CTL (2DN1). . If there is 28VDC: - do a check and repair the wiring between the engine 1 air intake anti-ice valve (4000DN) and the circuit breaker (1DN1).
2_ If the circuit breaker (1DN1) is open: - close the circuit breaker (1DN1).
C. Do the operational test given in Para. 3.
Failure of the Engine 2 Air Intake Anti-Ice Valve in the Closed Position
1. Possible Causes
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- VALVE-ENG AIR INTAKE ANTI ICE (4000DN)
