S 212-015
(8)
Remove the turbine bypass valves examine them for signs of volcanic ash (Ref 21-62-01/401).
S 212-016
(9)
Remove the compressor bypass check valves and examine them for signs of volcanic ash (Ref 21-51-06/401).
S 332-017
(10)
Remove the trim air modulating valves and examine them for signs of volcanic ash (Ref 21-61-08/401).
S 212-018
(11)
Examine the ram air inlet door actuators and examine them for signs of volcanic ash (Ref 21-62-03/401).
S 212-019
(12)
Examine the ram air exit louver actuators and examine them for signs of volcanic ash (Ref 21-62-05/401).
S 212-020
(13)
Remove the ram air inlet screens (if they are installed) and examine for them for signs of volcanic ash (Ref 21-51-15/401).
S 212-021
(14)
Remove the ram air inlet check valves and examine for them for signs of volcanic ash (Ref 21-51-14/401).
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747-400
MAINTENANCE MANUAL
S 212-022
(15)
Remove the air cycle pack heat exchangers and examine for them for signs of volcanic ash (Ref 21-51-03/401).
S 212-023
(16)
Remove the overhead recirculating fans and screens for signs of volcanic ash (Ref 21-25-01/401).
S 212-081
(17)
Remove the overhead recirculating fan filter elements and examine them for signs of volcanic ash (Ref 21-25-01/401).
S 212-024
(18)
Examine the outflow valve for signs of volcanic ash (Ref 21-31-01/601).
S 212-025
(19)
Remove the electrical/electronic cooling centrifugal air cleaner and examine it for signs of volcanic ash.
S 212-026
(20)
Remove the electrical/electronic cooling ground exhaust skin valve and examine it for signs of volcanic ash.
S 212-027
(21)
Remove the electrical/electronic cooling smoke override skin valve and examine it for signs of volcanic ash.
S 212-028
(22)
Remove the electrical/electronic cooling inboard exhaust valve and examine it for signs of volcanic ash.
S 212-082
(23)
Remove the electrical/electronic cooling inboard supply valve and examine it for signs of volcanic ash.
S 212-083
(24)
Remove the electrical/electronic cooling bypass valve and examine it for signs of volcanic ash.
S 212-029
(25)
Remove the electrical/electronic cooling supply and exhaust fans and examine them for signs of volcanic ash.
S 212-030
(26)
Open the access doors to the electrical/electronic bay power panels and look for signs of volcanic ash.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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ALL ú ú 01 Page 206 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
G. Examine the Pneumatic System
S 212-031
(1) Remove the bleed air precoolers (heat exchanger) and examine them for signs of volcanic ash (Ref 32-12-01/401).
NOTE: If signs of volcanic ash are not found in the outlet side of
____ the bleed air precooler, the procedure to examine the pneumatic system is complete. The remaining steps in the Examine the Pneumatic System are not necessary.
S 212-032
(2)
Remove the high stage bleed air valves and examine them for signs of volcanic ash (Ref 36-11-05/401).
S 212-033
(3)
Remove the pressure regulating and shutoff valves and examine them for signs of volcanic ash (Ref 36-11-04/401).
S 212-034
(4)
Remove the intermediate bleed port check valves and examine them for signs of volcanic ash (Ref 36-11-02/401).
S 212-035
(5)
If installed, remove the pressure relief valves and examine them for signs of volcanic ash (Ref 36-11-03/401).
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