B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
30-21-49-000-040 Removal of the Secondary Anti-ice Ducts 30-21-49-000-043 Removal of the Muscle Pressure Tubes and Hoses 30-21-49-000-044 Removal of the Forward Anti-ice Duct 30-21-49-000-045 Removal of the Middle Anti-ice Duct 30-21-49-000-046 Removal of the Top Anti-ice Duct 30-21-49-400-040 Installation of the Secondary Anti-ice Ducts 30-21-49-400-043 Installation of the Muscle Pressure Tubes and Hoses 30-21-49-400-044 Installation of the Forward Anti-ice Duct 30-21-49-400-045 Installation of the Middle Anti-ice Duct 30-21-49-400-046 Installation of the Top Anti-ice Duct 71-13-00-010-040 Opening of the Fan Cowl Doors 71-13-00-410-040 Closing of the Fan Cowl Doors 30-21-49-991-305 Fig. 601 30-21-49-991-306 Fig. 602
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3. Job Set-up
__________ Subtask 30-21-49-941-081
A. Safety Precautions
(1)
On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine 1(2)
(2)
Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3)
On the overhead maintenance panel 50VU:
(a)
Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b)
Put a warning notice to tell persons not to energize the FADEC 1(2).
Subtask 30-21-49-010-109
B. Get Access
(1) Open the fan cowl doors (Ref. TASK 71-13-00-010-040):
FOR 1000EM1
437AL 438AR
FOR 1000EM2
447AL 448AR
(2) Put the access platform in position. Subtask 30-21-49-865-077
C. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU ANTI ICE/ENG/2 1DN2 W10 122VU ANTI ICE/ENG/1 1DN1 X10
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4. Procedure
_________
(Ref. Fig. 601/TASK 30-21-49-991-305, 602/TASK 30-21-49-991-306) Subtask 30-21-49-210-066
A. Do a visual inspection of the anti-ice system hoses, tubes and ducts.
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1.
Examine the muscle pressure line hose assemblies, look for:
2.
Examine the fittings on the two ends of the hose, look for:
A. Broken Wire Braids. Maximum of 3 broken wires per plait. No more than 6 broken wires in an assembly. No more than 6 broken wires in each 1 ft. (0.30 m) of hose. If the damage is more thanthe allowable limits,replace the hose(Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
B. Cracks. None permitted. If cracks are found, replace the hose (Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
C. Crimps. None permitted. Replace the hose assembly (Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
D. Internal blockage. None permitted. If blockage is found remove the blockage or replace the hose (Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
E. Leakage. None permitted. Replace the hose (Ref. TASK 30-21-49-000-043) and (Ref. TASK 30-21-49-400-043).
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Anti-Ice System Tubes, Hoses and Ducts Figure 601/TASK 30-21-49-991-305
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Anti-Ice System Tubes, Hoses and Ducts Figure 602/TASK 30-21-49-991-306
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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
A. Thread damage. Damage is permitted if the threads that are good are not reduced by more than one thread. If the damage is more thanthe allowable limits,replace the hose(Ref. TASK 30-21-49-000-040) and (Ref. TASK 30-21-49-400-040).
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