75-34-00
ALL ú ú C01 Page 502 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 285-004-C00
(3) When the ENGINE START switch turns to the GRD position, make sure
you can feel or hear the 5th-stage start bleed valve operate (open).
S 285-005-C00
(4) If you feel or hear the 5th-stage start bleed valve, turn the ENGINE
START switch to the OFF position.
(a) Make sure the valve operates (closes) after you turn the switch
to the OFF position.
NOTE: The airflow from the valve will stop immediately, but____
the core engine will continue to spool down.
S 285-006-C00
(5) If you do not feel or hear the 5th-stage start bleed valve operate
(open), continue as follows:
(a) Continue to do the dry-motor procedure.
(b) ENGINES WITH THE START BLEED VALVE DEFLECTOR;
While the engine speed increases, a large quantity of airflow
must come out of the diffuser under the deflector baffle.
(c) ENGINES WITHOUT THE START BLEED VALVE DEFLECTOR;
While the engine speed increases, a large quantity of airflow
must come out of the diffuser.
1) If a large quantity of airflow does not occur, examine the
signal line from the start valve to the start bleed valve
for sources of leakage or blockage.
a) Examine for cracks in the tube, worn areas in the tube
because of chafing, loose tube nuts or flat tube
sections.
2) If you do not find leakage or blockage, replace the start
bleed valve (AMM 75-34-01/401).
(d) When there is a sufficient quantity of airflow, turn the ENGINE
START switch to the OFF position.
(e) Make sure the airflow from the diffuser stops while the bleed
valve closes.
1) If the airflow continues as the engine spools down, replace
the start bleed valve (AMM 75-34-01/401).
S 865-007-C00
(6) Use the Power Plant Dry-Motor procedure to do the engine shut-down
(AMM 71-00-00/201).
S 415-008-C00
(7) Close the left thrust reverser half (AMM 78-31-00/201).
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75-34-00
ALL ú ú C01 Page 503 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
5TH-STAGE START BLEED SYSTEM - INSPECTION/CHECK
_______________________________________________
1. General
_______
A. This procedure contains a visual inspection of the 5th-stage start bleed system.
B. Examine the bleed valve housing, flanges and air signal tube for damage and worn areas.
C. Also, do a fluorescent-penetrant inspection for cracks.
TASK 75-34-00-216-001-C00
2. Examine the 5th-Stage Start Bleed System
________________________________________
A. References
(1)
AMM 70-40-01/201, Fluorescent-Penetrant
(2)
AMM 75-34-01/401, 5th-Stage Start Bleed Valve
(3)
AMM 78-31-00/201, Thrust Reverser System
B. Access
(1)
Location Zones
506 Engine No. 1
606 Engine No. 2
(2)
Access Panels 5739L/5738L Engine No. 1 - Thrust Reverser Half 5839R/5838R Engine No. 2 - Thrust Reverser Half
C. Procedure (Fig. 601)
S 016-002-C00
(1)
Open the left thrust reverser half (AMM 78-31-00/201).
S 216-003-C00
(2)
Examine the bleed valve housing and flanges for:
(a)
Cracks; use the fluorescent-penetrant inspection (AMM 70-40-01/201). 1) If there are cracks in the bleed valve housing or flanges,
replace the valve (AMM 75-34-01/401).
(b)
Damage or change to the shape of the bleed valve housing or flanges. 1) If there is damage or change to the shape, replace the
valve (AMM 75-34-01/401).
(c)
Nicks and scratches. 1) Nicks and scratches are permitted.
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