CHECK OIL INDICATING

20 REPLACE COLLAPSED TUBE. SYSTEM PLUMBING (71-00-58,FIG. 114).
IS THERE A COLLAPSED
TUBE?

NO NONO
3 APPLY 80 PSI AIR PRESSURE 10 POINTER BELOW ZERO. 22 CHECK AND REPAIR CIRCUIT
TO OIL SUPPLY PRESSURE PORT REMOVE OIL PRESSURE INDI-BETWEEN CIRCUIT BREAKER AND
OF OIL PRESSURE TRANSMITTER CATOR (79-32-02). OIL PRESSURE INDICATOR.
(79-32-00 A/T) AND OBSERVE CLOSE APPLICABLE "OIL TEMP
INDICATOR READING.& PRESS" CIRCUIT BREAKER ON

NO
DOES INDICATOR READ 80

CIRCUIT BREAKER PANEL P6-2, |3 PSI?
AND CHECK FOR 28V AC POWER BETWEEN PINS 1 AND 2 (PIN 2
YES
GROUND) AT PLUG DISCONNECTEDFROM INDICATOR. IS 28V AC POWER AVAILABLE?
YES
YES

24 REPLACE FAULTY OIL PRES-SURE INDICATOR (79-32-02).

NO
NO

14 DISCONNECT ELECTRICAL PLUG
26 CHECK AND REPAIR CIRCUIT FROM OIL PRESSURE TRANSMITTER BETWEEN CIRCUIT BREAKER AND (FIG. 101). OIL PRESSURE TRANSMITTER
CHECK FOR 28V AC POWER (WM 79-32-01). BETWEEN PINS A AND C (PIN C GROUND).
 IS 28V AC POWER AVAILABLE?
YES 27 REPLACE OIL PRESSURE TRANSMITTER T429 (79-32-01).
Oil Pressure Indicating System Problems
Figure 103 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH OIL PRESSURE ú

 71-00-55
 INDICATORS  ú
 ú  C02  Page 109
 ú  Jul 15/93 
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. 

////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL PRESSURE INDI-PREREQUISITES: CATING SYSTEM 28V AC POWER AVAILABLE PROBLEMS
CB'S IN: 6-2-A2,6-2-A3,6-2-C16, AND 6-2-C17
NO

1 PERFORM SECONDARY ENGINE 20 REPLACE SECONDARY ENGINE AND HYDRAULICS DISPLAY BITE AND HYDRAULICS DISPLAY UNIT
TEST (31-42-02).N183 (31-42-02).
DOES DISPLAY PASS TEST?
YES YES 3 CHECK OIL INDICATING

SYSTEM PLUMBING (71-00-58,
FIG. 114).
IS THERE A COLLAPSED
TUBE?

NO NO NO
5 APPLY 80 PSI AIR PRESSURE 10 DISCONNECT ELECTRICAL PLUG 24 CHECK AND REPAIR CIRCUIT
TO OIL SUPPLY PRESSURE PORT FROM OIL PRESSURE TRANSMITTER BETWEEN CIRCUIT BREAKER AND OF OIL PRESSURE TRANSMITTER (FIG. 101). OIL PRESSURE TRANSMITTER (79-32-00 A/T) AND OBSERVE CHECK FOR 28V AC POWER (WM 79-32-01). READING.BETWEEN PINS A AND C (PIN C
DOES DISPLAY READ 80 |3 GROUND).PSI? IS 28V AC POWER AVAILABLE?
YES
YES 26 REPLACE OIL PRESSURE TRANSMITTER T429 (79-32-01).

Oil Pressure Indicating System Problems
Figure 103 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH SECONDARY ENGINE ú

 71-00-55
 AND HYDRAULICS DISPLAY  ú
 ú  C02  Page 110
 ú  Jul 15/93 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
OIL TEMPERATURE PREREQUISITES: INDICATING SYSTEM 28V AC POWER AVAILABLE PROBLEMS
CB'S IN: 6-2-D6 AND 6-2-D8
NONO

1 IS OIL TEMPERATURE INDICA-10 REMOVE OIL TEMPERATURE20 CHECK AND REPAIR CIRCUIT TOR OPERATING (POINTER READS INDICATOR (79-34-02). BETWEEN CIRCUIT BREAKER AND ABOVE -50`C)? CLOSE APPLICABLE "OIL OIL TEMPERATURE INDICATOR TEMP & PRESS" CIRCUIT BREAKER (WM 79-33-01).
YES ON CIRCUIT BREAKER PANEL P6-2 AND CHECK FOR 28V AC POWER BETWEEN PINS 2 AND 5 (PIN 5 GROUND) AT PLUG DISCONNECTED FROM INDICATOR.

 IS 28V AC POWER AVAILABLE?
YES
NO

11 EXCHANGE INDICATOR N45 OR 21 REPLACE FAULTY OIL
N46 WITH AN OPERABLE UNIT TEMPERATURE INDICATOR
(79-34-02) AND OBSERVE (79-34-02).
INDICATOR READING.

 IS OIL TEMPERATURE INDI-CATOR OPERATING (POINTER READS
ABOVE -50`C)?

YES
NO
13 OPEN LEFT FAN COWL PANEL 23 CHECK AND REPAIR CIRCUIT (71-11-02 MP).BETWEEN OIL TEMPERATURE BULB
DISCONNECT ELECTRICAL AND OIL TEMPERATURE INDICATOR PLUG FROM OIL TEMPERATURE (WM 79-33-01). BULB (FIG. 101) AND OBSERVE INDICATOR READING.
YES
IS POINTER OFF SCALE HIGH?
　
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