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DRAIN FOR THE AIR/OIL HEAT THERMAL RELIEF
EXCHANGER VALVE AND 2.5 VENT FOR THE IDG
BLEED VALVE ACTUATOR
OIL SEAL DRAIN FOR STRUT DRAIN
THE STARTER DRIVE

DRAIN FOR THE FUEL
OIL SEAL DRAIN FOR

PUMP DRIVE OIL SEAL
THE EEC ALTERNATOR

DRAIN FOR THE FUEL/OIL COOLER, BYPASSDRIVE
VALVE OF THE FUEL/OIL COOLER, AND THE OIL SEAL DRAIN FOR FUEL/OIL HEAT EXCHANGER OF THE IDG THE HYDRAULIC PUMP DRIVE

FLUID COLLECTOR
OVERBOARD DRAIN

Engine Vents and Drains
Figure 601 (Sheet 2)

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

Engine Vents and Drain - Schematics
Figure 602

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C78876C78877
COWL FAN  LEFT 425AL (RIGHT ENGINE OUTBOARD) THRUST REVERSER, 415AL (LEFT ENGINE INBOARD), 
COWL CORE 

RIGHT THRUST REVERSER
ANGLE  DRAIN  OIL TANK 
GEARBOX  COLLECTOR  SEE  C 
SEE  B  SEE  A 
FLUID TRAP FOR THE 
DRAIN LINE OF THE 
GENERATOR DRIVE OIL 
SEAL OF THE ELECTRONIC 
ENGINE CONTROL 

FLUID TRAP FOR THE 
DRAIN LINE OF THE 
STARTER DRIVE OIL SEAL
DRAIN 
COLLECTOR  FWD 
DRAIN COLLECTOR 
A 
Fluid Trap Location 
Figure 603 (Sheet 1) 

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FLUID TRAP FOR THE DRAIN LINE 
OF THE AIR/OIL HEAT EXCHANGER 
VALVE 
ANGLE 
GEARBOX  FUEL/OIL 
(REF)  COOLER (REF) 
FLUID TRAP FOR THE 
DRAIN LINE OF THE  MAIN 
2.5 BLEED VALVE  GEARBOX 
ACTUATOR  (REF) 
ANGLE GEARBOX 
FLUID TRAP 
B FOR THE 
DRAIN LINE OF 
THE FUEL/OIL 
COOLER VALVE 

SEE D
OIL TANK
C
FLUID TRAP FOR THE DRAIN LINE OF THE BYPASS VALVE FOR THE FUEL/OIL COOLER AND THE FUEL/OIL HEAT EXCHANGER OF THE IDG
D
Fluid Trap Location
Figure 603 (Sheet 2)

C78879
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FLUID TRAP FOR THE DRAIN 
LINE OF THE AIR SHUTOFF 
STATOR VANE  VALVE FOR THE TCC 
ACTUATOR 
SEE  E 

STATOR VANE ACTUATOR (REF)
FLUID TRAP FOR THE DRAIN 
LINE OF THE AIR/OIL HEAT 
　
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