IS DRIVE SHAFT BROKEN?  AND LET IT STABILIZE
(AMM 71-00-00/501, TEST

NO
NO. 5). THEN SHUT IT DOWN. LOOK AT THE MCD. IS THERE UNUSUAL CONTAMI-
NATION?
NO
NO

8 TURN THE ENGINE WITH YOUR
HAND (AMM 72-00-00/201).

LOOK AT THE LUBRICATION
UNIT DRIVE SHAFT IN THE AGB
PAD.

DOES PAD DRIVE SHAFT TURN?

YES NO

9 REPLACE THE LUBRICATION
UNIT (AMM 79-21-01/401).
CLOSE THE FAN COWL PANELS
(AMM 71-11-02/201).

 OPERATE THE ENGINE AT MPA
AND LET IT STABILIZE
(AMM 71-00-00/501, TEST
NO. 5).

LOOK AT THE OIL PRESSURE
INDICATOR.
 IS THE OIL PRESSURE OK?

YES

Low or No Oil Pressure
Figure 103 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C75620
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONE
HIGH OIL PRESSURE AND/OR PRESSURE CHANGE MORE THAN 10 PSI

YES
1
OPEN THE FAN COWL PANELS

(AMM 71-11-02/201). EXAMINE THE OIL SUPPLY TUBES, THE OIL SCAVENGE TUBES (AMM 71-00-58/ 101, FIG. 102) AND THE TUBES TO THE OIL PRESSURE TRANSMITTER (AMM 71-00-58/101, FIG. 114).
 IS THERE A COLLAPSED TUBE?

NO
NO

2 TROUBLESHOOT THE OIL PRESSURE INDICATING SYSTEM

(AMM 71-00-55/101, FIG. 103).
IS THE OIL PRESSURE INDICATING SYSTEM OPERATIONNORMAL?

YES
YES
3 DO THE AIRFLOW TEST FOR THE OIL SYSTEM (AMM 71-00-59/

101, FIG. 116).
IS THE FLOW TEST IN THE LIMITS?

NO
NO
IS OUT OF THE LIMITS, CLEAN
THE OIL SUPPLY TUBE TO THE AFT
SUMP (AMM 72-56-00/701).
DO THE AFT SUMP AIR FLOW
TEST FOR THE OIL SYSTEM AGAIN
(AMM 71-00-59/101, FIG. 116).
IS THE FLOW TEST IN THE
LIMITS?

4 IF ONLY THE AFT SUMP FLOW

YES
30 REPLACE THE COLLAPSED TUBE.

High Oil Pressure and/or Pressure Change More Than 10 Psi
Figure 104

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
HIGH OIL TEMPER-ATURE
PREREQUISITES NONE

High Oil Temperature
Figure 105

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES NONE
NOTE:DURING THE FIRST START OF THE DAY OR DURING COLD WEATHER STARTS, THE OIL PRESSURE CAN RISE ABOVE THE NORMAL RANGE AND THE OIL FILTER
OIL FILTER BYPASS
BYPASS LIGHT CAN COME ON. OPERATE THE ENGINE WARNING LIGHT AT IDLE POWER; THE FILTER BYPASS LIGHT SHOULD ILLUMINATED GO OFF AS THE OIL WARMS AND THE PRESSURE
RETURNS TO NORMAL.
YES

1 OPEN THE LEFT FAN COWL 20 REPLACE THE OUTLET PRES-PANEL (AMM 71-11-02/201) AND SURE TUBE. EXAMINE FOR A COLLAPSED OUTLET PRESSURE TUBE TO THE WARNING SWITCH TO THE OIL FILTER BYPASS (AMM 71-00-58/101, FIG. 114).
IS THE TUBE DAMAGED? NO YES

2 EXAMINE THE CLOGGING
21 DO THIS PROCEDURE: OIL
INDICATOR ON THE SCAVENGE OIL FILTER CLOG INDICATED
FILTER (AMM 71-00-58/101, (FIG. 107).
FIG. 112).

 IS THE RED POP-UP INDICA-TOR VISIBLE?
NO
　
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