Fuel Filter Check
Figure 103 (Sheet 3)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CDP (AIR) TUBE CHECK
1. CHECK THAT START LEVERS ARE IN CUTOFF POSITION. INSTALL DO-NOT-OPERATE IDENTIFIERS.
2.
OPEN FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP).
3.
CHECK CDP TUBING AND FITTINGS FOR DAMAGE OR LEAKAGE SOURCES AS FOLLOWS:
A. CRACKS OR BREAKS
B. LOOSE FITTINGS (OR CROSS-THREADED)
C. WEAR
D. COLLAPSED OR KINKED SECTIONS
4. CHECK CDP TUBING FOR BLOCKAGE AS FOLLOWS:
A. CHECK DRAIN HOLES IN BOTTOM OF TUBING FOR CLOGGING AND CLEAR WITH WIRE AS NECESSARY.
B. DISCONNECT TUBING AT MEC AND LOOSEN CLAMPING DOWN TO STAINLESS STEEL BRAIDED SECTION TO ALLOW TUBE TO BE SEPARATED FROM MEC. FIT PROTECTIVE CAP TO MEC PORT.
C. BLOW INTO OPEN TUBE END. AIR SHOULD FLOW FREELY INTO COMBUSTION CASE.
D. IF NOT, APPLY 10 PSI (70 KPA) CLEAN, FILTERED AIR TO OPEN TUBE END TO CLEAR BLOCKAGE. IF INEFFECTIVE, REPLACE TUBING AS NECESSARY.
5. CHECK CDP TUBING FOR LEAKS AS FOLLOWS:
A. APPLY LEAK-TEK (SOAP SOLUTION) TO ALL FITTINGS.
B. AT OPEN TUBE END (FROM STEP 4.), APPLY 100-150 PSI (700-1050 KPA) CLEAN, FILTERED AIR CONTINU-OUSLY AND EXAMINE TUBING AND FITTINGS CLOSELY FOR EVIDENCE OF LEAKS. IF FOUND, REPAIR/REPLACE TUBING/FITTINGS AS REQUIRED.
C. IF NO LEAKS FOUND, RECONNECT TUBE TO MEC. TIGHTEN COUPLING NUT TO 135-150 POUND-INCHES (15.2-
17.0 N.M) AND LOCKWIRE. TIGHTEN CLAMPS.
6.
APPLY LEAK-TEK (SOAP SOLUTION) TO FITTING AT MEC.
7.
CLOSE FAN DUCT COWL AND THRUST REVERSER HALVES (78-31-00 MP), EXCEPT LEAVE FAN COWL PANELS OPEN.
8.
PERFORM IDLE POWER LEAK CHECK (FAN COWL PANELS OPEN)(71-00-00, TEST NO. 3). CHECK FOR EVIDENCE OF AIR LEAKS AT FITTING. IF FOUND, REPAIR/REPLACE/RETIGHTEN FITTING AS REQUIRED.
CDP (Air) Tube Check
Figure 104 (Sheet 1)
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71-00-59
ALL ú ú C02 Page 107 ú Feb 25/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
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