The BLEED TRIP OFF Light Was Illuminated. The Engine Was the Bleed Source
Figure 103 (Sheet 5)
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A48046
A 737-300/400/500MAINTENANCE MANUAL
SEE E
SEE D (490`F) OVERHEAT SWITCH ENGINE BLEED
BLEED AIR REGULATOR SEE C ELECTRICAL CONNECTOR, D3064 BLEED AIR REGULATOR
FWD
C
PNEUMATIC DUCT
ENGINE BLEED AIR OVERHEAT SWITCH (490`F)
FWD
D
E
The BLEED TRIP OFF Light Was Illuminated. The Engine Was the Bleed Source
Figure 103 (Sheet 6)
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A48454
A 737-300/400/500MAINTENANCE MANUAL
SUPPLY LINE TO THE PRECOOLER CONTROL VALVE
SEE F
5TH-STAGE SUPPLY LINE
MS-6 (UNION)
SUPPLY LINE
TO THE BLEED
AIR REGULATOR
5TH-STAGE
CHECK VALVE
SUPPLY
PRESSURE
GAUGE (Ps)
TEST LINE 5TH-STAGE
DUCT
FWD
NITROGEN PRESSURE
SUPPLY REGULATOR
PRESSURE
FThe BLEED TRIP OFF Light was Illuminated. The Engine was the Bleed Source
The BLEED TRIP OFF Light Was Illuminated. The Engine Was the Bleed SourceFigure 103 (Sheet 7)
A48475
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A
737-300/400/500
MAINTENANCE MANUAL
PRECOOLER CONTROL VALVE
SEE G
CONTROL PRESSURE LINE TO THE PRECOOLER CONTROL VALVE SENSOR
MS-6 (UNION)
PRECOOLER CONTROL VALVE
CONTROL
PRESSURE
GAUGE (Pc)
TEST LINE NEEDLE VALVE
G The BLEED TRIP OFF Light was Illuminated. The Engine was the Bleed Source
The BLEED TRIP OFF Light Was Illuminated. The Engine Was the Bleed SourceFigure 103 (Sheet 8)
A48495
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A 737-300/400/500MAINTENANCE MANUAL
PREREQUISITES
MAKE SURE THESE CIRCUIT BREAKERS ARE CLOSED (P6-4): B1,B2,B3,D1,D2,D3,D4
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201) NO PRESSURE IN THE PNEUMATIC SYSTEM (AMM 36-00-00/
201) APPLICABLE ENGINE BLEED SWITCH (P5 PANEL) IN THE OFF POSITION
EQUIPMENT: 0-200 PSIG GAS SOURCE (NITROGEN BOTTLE) PRESSURE REGULATOR PRESSURE GAUGES (2 REQUIRED)MS-6 UNION FITTINGS (3 REQUIRED) NEEDLE VALVE
LOW DUCT PRESSURE. THE ENGINE WAS THE BLEED SOURCE.
YES
1 NOTE: A PROBLEM WITH THE
DUCT PRESSURE
TRANSMITTER OR
INDICATOR CAN CAUSE
A LOW DUCT PRESSURE
CONDITION.
SUPPLY PNEUMATIC PRESSUREWITH THE APU OR GROUND AIR SOURCE (AMM 36-05-00/201).
PUT THE ISOLATION VALVE TO THE OPEN POSITION ON THE P5PANEL (SEE SHEET 6, VIEW A).
IS THE DUCT PRESSURE ON ONE SIDE MORE THAN 3 PSI LOWER THAN THE OTHER SIDE?
NO
SEE SHEET 2 (BLOCK 2)
____. LOW DUCT PRESSURE CAN BE CAUSED BY A PROBLEM
NOTE: WITH ONE OF THESE ITEMS:
-PRESSURE INDICATION SYSTEM
-LEAKY SENSE LINES-COMPONENT IN THE COOLING SYSTEM
-PRSOV OR BLEED AIR REGULATOR (BAR)
-HIGH-STAGE VALVE OR HIGH-STAGE REGULATOR.
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