71-00-59
ALL ú ú C02 Page 108 ú Feb 25/86
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
CBP TUBE
FWD
SENSOR BLEED BIAS BRACKET TUBE CDP
BLEED DUCT 9TH-STAGE STRUT 6 0'CLOCK
B 5TH-STAGE BLEED DUCT TUBE CDP MANIFOLD FUEL
BLEED DUCT 9TH-STAGE
FWD
C BRACKET
Figure 104 (Sheet 3) CDP (Air) Tube Check
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71-00-59
ALL ú ú C02 Page 109 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
CBP (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 (AMM 78-31-00/201).
3.
CHECK 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 CBP TUBING FOR BLOCKAGE AS FOLLOWS:
A. 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.
B. BLOW INTO OPEN TUBE END. AIR SHOULD FLOW FREELY INTO COMBUSTION CASE.
C. IF NOT, APPLY 10 PSI (70 KPA) CLEAN, FILTERED AIR PRESSURE TO OPEN TUBE END TO CLEAR BLOCKAGE. IF INEFFECTIVE, REPLACE TUBING AS NECESSARY.
D. CHECK THE DRAIN HOLES IN THE BOTTOM OF THE TUBING FOR CLOGGING AND CLEAR WITH A WIRE AS NECESSARY.
5. CHECK CBP TUBING FOR LEAKS AS FOLLOWS:
A. APPLY LEAK-TEK (SOAP SOLUTION) TO ALL FITTINGS, INCLUDING ENTIRE BLEED BIAS SENSOR HOUSING.
B. AT OPEN TUBE END (FROM STEP 4.), APPLY 100-150 PSI (700-1050 KPA) CLEAN, FILTERED AIR CONTINUOUSLY AND EXAMINE TUBING, FITTINGS, AND HOUSING CLOSELY FOR EVIDENCE OF LEAKS. IF FOUND, REPAIR/REPLACE TUBING/FITTINGS/BLEED BIAS SENSOR (AMM 75-33-01/401) AS REQUIRED.
C. IF NO LEAKS FOUND, RECONNECT TUBE TO MEC. TIGHTEN COUPLING NUT TO 65-75 POUND-INCHES
(7.3-8.5 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 (AMM 78-31-00/201), 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.
CBP (Air) Tube Check
Figure 105 (Sheet 1)
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71-00-59
ALL ú ú C02 Page 110 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE B
SEE A
MECCDP TUBE
CBP TUBE
FWD
A
CBP (Air) Tube Check Figure 105 (sheet 2)
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71-00-59
ALL ú ú C02 Page 111 ú Feb 25/86
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
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