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1.  General
A.  There are principally three types of instrument indicators. They are the clamp, bezel, and rear mounted types.
B.  The clamp type indicator is held in position by a spring clamp which is fastened to the rear of the front panel with a clamp retaining screw. The clamp is tightened around the indicator by a clamp adjustment screw; thereby, holding the indicator in position.
C.  The bezel type indicator is held in position similarly as the clamp type indicator. A bezel is mounted on the front of the panel; otherwise the indicators are secured in an identical manner.
D.  The rear-mounted type of indicator is held in position with three retaining screws which holds the flange on the indicator flush with the rear of the instrument panel.
501 
Feb 15/69  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  31-00 Page 1 

BEZEL AND CLAMP-TYPE INDICATORS - REMOVAL/INSTALLATION
1.  General
A.  The following instructions concern the removal/installation of the bezel and clamp-type instrument indicators.
2.  Remove Bezel and Clamp-Type Indicators
A.  Open applicable circuit breakers pertaining to indicator being removed.
WARNING:  TAG AND SAFETY THE CIRCUIT BREAKERS.
WARNING:  MAKE SURE EACH ELECTRICAL CONNECTOR HAS A TAG TO IDENTIFY THE CORRECT INSTALLATION LOCATION TO THE [name of gage, indicator, component]. CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS CAN CAUSE THE AIRPLANE SYSTEM TO MALFUNCITON AND THE LOSS OF SAFE FLIGHT.
B.  Loosen quarter-turn fasteners along panel or module edge by turning fasteners one-quarter turn counterclockwise.
C.  Fold down instrument panel or pull-out module.
D.  Loosen indicator mounting clamp adjustment screw (Fig. 401 and 402).
E.  Disconnect electrical connectors and lines (pitot, static, etc.).
F.  Cap electrical connectors and lines. Tag and secure them to prevent falling back into cutout.
3.  Install Bezel and Clamp-Type Indicators
A.  Make certain that applicable circuit breakers pertaining to indicator to be installed are opened and tagged.
WARNING:  MAKE SURE EACH ELECTRICAL CONNECTOR HAS A TAG TO IDENTIFY THE CORRECT INSTALLATION LOCATION TO THE [name of gage, indicator, component]. CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS CAN CAUSE THE AIRPLANE SYSTEM TO MALFUNCITON AND THE LOSS OF SAFE FLIGHT.
B.  Remove dust cap and tag from electrical connectors and lines, if any.
C.  Align applicable indicator and connect electrical connectors to indicator. Connect lines if any.
D.  Insert indicator into panel.
E.  Tighten mounting clamp adjustment screw.
F.  Fold up instrument panel or push-in module.
G.  Tighten quarter-turn fasteners along panel or module edge by turning fasteners one-quarter turn clockwise.
H.  Close circuit breakers and remove safety tags.

Clamp Mounted Indicator Installation  501 
31-00-11  Figure 401  Nov 15/76 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

501  Bezel-Mounted Indicator Installation 
Feb 15/69  Figure 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  31-00-11 Page 403 

REAR-MOUNTED TYPE INDICATOR - REMOVAL/INSTALLATION
1.  General
A.  The following instructions concern the removal/installation of the rear-mounted instrument indicator.
2.  Remove Rear-Mounted Type Indicator
A.  Open applicable circuit breakers pertaining to indicator being removed.
WARNING:  TAG AND SAFETY THE CIRCUIT BREAKERS.
WARNING:  MAKE SURE EACH ELECTRICAL CONNECTOR HAS A TAG TO IDENTIFY THE CORRECT INSTALLATION LOCATION TO THE [name of gage, indicator, component]. CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS CAN CAUSE THE AIRPLANE SYSTEM TO MALFUNCITON AND THE LOSS OF SAFE FLIGHT.
B.  Loosen quarter turn fasteners along panel or module edge.
C.  Fold down panel or pull-out module and remove electrical connectors and lines from indicator (pitot, static, etc.).
D.  Remove three indicator retaining screws on front of panel or module (Fig. 401).
E.  Cap electrical connectors and lines. Tag and secure them.
3.  Install Rear-Mounted Type Indicator
A.  Make certain the applicable circuit breakers pertaining to the indicator to be installed are open and tagged.
WARNING:  MAKE SURE EACH ELECTRICAL CONNECTOR HAS A TAG TO IDENTIFY THE CORRECT INSTALLATION LOCATION TO THE [name of gage, indicator, component]. CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS CAN CAUSE THE AIRPLANE SYSTEM TO MALFUNCITON AND THE LOSS OF SAFE FLIGHT.
　
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