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 B.  Each PDU contains two functionally independent power sources geared to a common output shaft through a planetary gear system. The primary pneumatic drive is directly connected to the sun gear and the alternate electric drive is geared to the annular gear of the planetary system. The gears run in an oil bath. Oil level sight glasses on each side of the gear housing provide visible indication of oil level in either the variable camber or the Krueger flap installation.
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A
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SEE SEE  B B  VARIABLE CAMBER FLAPS  HINGE  DRIVE SHAFT  DRIVE UNIT  SEE  C  OFFSET GEARBOX 
SEE  A  KRUEGER FLAPS 
ROTARY ACTUATOR 
FOLDING FAIRING  SEE  D 
A KRUEGER FLAPS  LINKAGE FAIRING ACTUATING KRUEGER FLAP 
DRIVE UNIT 

FLAP PANEL
ROTARY
SEE C
ACTUATOR

FOLDING
NOSE

VARIABLE CAMBER FLAPS
B
Leading Edge Flaps and Drive Mechanism Components Figure 3 (Sheet 1)
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MAINTENANCE MANUAL

RECTIFIER AND
PRIMARY DRIVE
SOLENOID
ALTERNATE
ELECTRIC
MOTOR

SERVO MOTOR
AND SWITCH
ASSEMBLY

OUTPUT DRIVE SPLINE
SENSITIVE ANNUNCIATOR FEEDBACK SWITCH
LE FLAP ELECTROPNEUMATIC DRIVE UNIT
C
ALTERNATE SOLENOID VALVE PRESSURE REGULATOR PNEUMATIC
VALVE
INLET DUCT
ASSEMBLY
OVERPRESSURE
SWITCH

ROTARY
CONTROL
VALVE

WING STRUCTURE
DRIVE SHAFT
ROTARY ACTUATOR
KRUEGER FLAP ROTARY ACTUATOR
D
Leading Edge Flaps and Drive Mechanism Components
Figure 3 (Sheet 2)

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 C.  When installed in the airplane with the flaps extended, the exposed lower side of the PDU provides ready access to electrical power plugs, solenoid valves, the alternate electric motor assembly, primary servomotor and oil drain and filler plugs.
 6.  Variable Camber Flaps Rotary Actuators
______________________________________
 A.  Each rotary actuator (Fig. 3) is a gearbox which reduces the motion from the LE flap PDU's. The actuators which position outboard flaps No. 1E through 5 and 22 through 26E have a gear ratio of approximately 239 to 1. The actuators which position the center flaps, No. 6 through 10 and 17 through 21, have a gear ratio of approximately 250 to 1. Different spacing in mounting bolt holes prevent interchanging the two configurations.
 7.  Krueger Flaps Rotary Actuators
______________________________
 A.  Each Krueger flap is actuated by two rotary actuators (Detail D, Fig. 3) which reduces drive shaft motion. Each actuator has a gear reduction of 60 to 1. The gears are enclosed in a housing that attaches to fixed wing structure. The input shaft extends through the actuator and is splined at both ends.
 8.  Offset Gearbox
______________
 A.  An offset gearbox (Detail A, Fig. 3) is located adjacent to each Krueger flap PDU. The gearboxes reduce the motion from the PDU's and transfer the motion to the rotary actuators. Each gearbox has a single stage gear reduction of 3.5 to 1. The input and output shafts are offset.
 9.  Operation
_________
 A.  Functional Description - High Lift System
 (1)  
The high lift system is normally driven by hydraulic power for the TE flaps and pneumatic power for the LE flaps. Hydraulic system 1 provides power for the inboard TE flaps, and hydraulic system 4 provides power for the outboard TE flaps.
　
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