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CAUTION: BE PREPARED TO CATCH SPILLED HYDRAULIC FLUID.
C.  Install plugs in hydraulic lines and cap all ports.
D.  Remove mounting bolts attaching hydraulic motor to flap power unit and remove hydraulic motor.
E.  Take necessary precautions to prevent dirt entering hydraulic motor cavity when motor is removed.
3.  Install Flap Hydraulic Motor
A.  Install O-ring and check valve in case drain port of motor. Lightly lubricate O-ring with hydraulic fluid or assembly lube at installation.
B.  Install O-ring and reducer in remaining ports on hydraulic motor. Lubricate O-rings.
C.  Grease hydraulic motor external spline lightly.
D.  Carefully insert hydraulic motor into housing and install mounting bolts attaching motor to flap power unit. (See figure 401.)
E.  Remove caps from ports and plugs from hydraulic lines.
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Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-231 Page 401 

G25783
Flap Hydraulic Motors Installation  506 
27-51-231  Figure 401  Nov 15/67 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

F. Connect hydraulic lines to hydraulic motor.
G. Provide system A hydraulic power. Refer to 27-51-0.
H. Cycle flaps to bleed hydraulic system.
I. Examine hydraulic lines on motor for leakage.
J. Test flap hydraulic motor. Refer to Flap Hydraulic Motor - Adjustment/Test.
K. Remove system A hydraulic power. Refer to 27-51-0.
L. Check hydraulic reservoirs and service if required. Refer to Chapter 12, Hydraulic Servicing.
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Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-231 Page 403 

FLAP HYDRAULIC MOTOR - ADJUSTMENT/TEST
1.  Flap Hydraulic Motor Test
A.  Test Flap Hydraulic Motor
(1)  
Provide system A hydraulic power. Refer to 27-51-0, Trailing Edge Flaps -Maintenance Practices.

NOTE:  Hydraulic service cart set at 20 gpm and 3000 psi or operation of at least one engine-driven pump is required to perform this portion of test.

(2)  
Move flap control lever from FLAP UP detent to FLAP DOWN (40-unit) detent.

(3)  
Check that time for flaps to extend is 35 (士5) seconds.

NOTE:  Operating time should be measured from start of flap motion in up position until downstop on number 4 ballscrew nut is 1.50 (士0.20) inches from downstop on jackscrew.

(4)  
Position flap control lever in FLAP UP detent.

(5)  
Check that time for flaps to retract is 35 (士5) seconds.

(6)  
Remove system A hydraulic power. Refer to 27-51-0.

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Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-51-231 Page 501 

FLAP ALTERNATE DRIVE UNIT - REMOVAL/INSTALLATION
1.  Equipment and Material
A.  Primer - BMS 10-11, Type I (Ref 20-30-41)
B.  Grease - MIL-G-23827 (Ref 20-30-21)
C.  Hydraulic Fluid - MIL-H-5606 (Ref 20-30-21)
2.  Prepare Flap Alternate Drive Unit for Removal
A.  Provide system A hydraulic power (Ref 27-51-0, Maintenance Practices).
B.  Position flap control lever to FLAP UP detent.
C.  Remove system A hydraulic power and depressurize system A reservoir (Ref 27-51-0).
D.  On circuit breaker panel P6-2 open TE ALT FLAP DRIVE MOTOR circuit breaker.
3.  Remove Flap Alternate Drive Unit
A.  Disconnect electrical connector from alternate drive unit (Fig. 401).
B.  Remove bonding jumper between alternate drive unit and mounting bracket.
C.  Remove bolts attaching alternate drive unit to flap power unit and remove unit.
4.  Install Flap Alternate Drive Unit
A.  Fill drive unit with hydraulic fluid prior to installation (Ref Chapter 12, Trailing Edge Flap System Lubrication).
B.  Swab or brush primer in mounting bolt holes on flap power unit and on alternate drive unit  (Fig. 401)
C.  Apply a light coat of grease to entire length of output spline of alternate drive unit and to input spline on flap power unit.
D.  Position alternate drive unit on flap power unit and install mounting bolts.
E.  Install bonding jumper between alternate drive unit and mounting bracket.
F.  Connect electrical connector to alternate drive unit.
G.  Test flap alternate drive unit (Ref Adjustment/Test).
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