(11)
Position flap control lever to FLAP UP detent to retract flaps.

(12)
Remove system A hydraulic power (Ref 27-51-0 MP).

(13)
Remove electrical power (Ref 24-22-0 MP).

5C8 
27-58-12 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/03 

FLAP POSITION TRANSMITTER GEARBOX - REMOVAL/INSTALLATION
1.  General
A.  This procedure covers both the left and right position transmitter gearboxes. The illustration shows left side installation. Right side installation is similar but opposite.
B.  The position transmitter may be left attached to the gearbox during removal by merely removing the electrical connector. Or the transmitter may be removed prior to removal of gearbox. Refer to 27-58-12, Flap Position Transmitter - Removal/Installation.
2.  Equipment and Materials
A.  Primer - Type 1, BMS 10-11
B.  Grease - MIL-G-23827
3.  Remove Flap Position Transmitter Gearbox
A.  Provide hydraulic system A hydraulic power. Refer to 27-51-0, Trailing Edge Flaps -Maintenance Practices.

B.  Position flap control lever in FLAP DOWN detent to lower flaps.
C.  Remove system A hydraulic power. Refer to 27-51-0.
D.  Remove electrical connector from position transmitter. (See figure 401.)
E.  Disconnect torque tube spline coupling sleeves.
(1)  
Remove three screws from both spline coupling sleeves.

(2)  
Slide coupling sleeves off gearbox splines to disconnect torque tubes.

CAUTION:  SUPPORT TORQUE TUBES BEFORE DISCONNECTING TO PREVENT POSSIBLE DAMAGE.
F.  Remove four gearbox mounting bolts and remove gearbox from airplane.
531 
Feb 15/73  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-58-31 Page 401 

G28876
Flap Position Transmitter Gearbox  515 
27-58-31  Figure 401  May 15/72 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  Install Flap Position Transmitter Gearbox
A.  Position gearbox against wing rear spar. Install four bolts and washers after wetting bolts with primer.
B.  Apply grease liberally to splines. Fill gearbox spline coupling voids with grease.
C.  Position torque tubes on each side of gearbox and slide coupling sleeve splines over gearbox splines.
D.  Secure each spline coupling sleeve with three screws and lockwire screws.
E.  Position torque tubes away from flap transmitter gearbox until couplings contact.
F.  Check that gap between each pair of gearbox coupling halves is 0.46 +0.06/-0.21 inch.
G.  Install flap position transmitter if transmitter was removed (Ref 27-58-12, Removal/Installation).
H.  Install electrical connector on flap position transmitter.
I.  Install transmitter installation (Ref 27-58-12, Removal/Installation).
521 
May 20/82  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-58-31 Page 403 

TRAILING EDGE FLAP POSITION INDICATOR - REMOVAL/INSTALLATION
1. General
A.  The trailing edge flap position indicator is located on the control cabin center instrument panel, P2.
2.  Remove Indicator
A.  Open trailing edge flap position circuit breaker on P6 panel.
B.  Remove indicator from front of instrument panel and disconnect electrical connector.
3.  Install Indicator
A.  Connect electrical connector on indicator and install in instrument panel.
NOTE:  Indicators for electrical asymmetry and mechanical asymmetry systems are physically interchangeable but not functionally interchangeable. If an indicator for a mechanical asymmetry system is installed in an electrical asymmetry system, the asymmetry system will not operate. The following procedure will verify a correct installation.
B.  Provide electrical power.
C.  Close trailing edge flap position circuit breaker on P6 panel.
D.  Position flap control lever in FLAP UP detent.
E.  Provide system A hydraulic power to retract flaps (Ref 27-51-0, Maintenance Practices). Hold for 2 minutes.
F.  Gain access to flap asymmetry test switch (Fig. 401).
G.  Position switch to test L position and check that test light illuminates.
H.  Release test switch and check that test light goes out.
I.  Position switch to test R position and check that test light illuminates.
J.  Release test switch and check that test light goes out.
K.  Cycle flaps through complete operating range and check that indicator pointers are compatible with flap positions.
　
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