737 AMM 飞机维护手册 点火 IGNITION(14)

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A.  Open all ignition circuit breakers on the P6 circuit breaker panel.
B.  Remove lower forward panel (left side) from pilot’s control stand (Fig. 401).
NOTE:  The switches are mounted between two brackets in the pilot’s control stand between the left and right lower forward panels. It may also be necessary to remove the right lower forward panel.
C.  Remove center brace located behind lower forward panel.
2.  Remove Start Lever Switches
A.  Disconnect electrical leads from all switches. Identify leads to facilitate reassembly.
B.  Remove switch mounting screws and remove switches.
3.  Install Start Lever Switches
A.  Position switches S88 and S89 (Fig. 401) in place inside left engine start switch bracket. Install one switch mounting screw into switches S88 and S89. Hold switch mounting screw in position.
B.  Install switches S90 and S91 (Fig. 401).
C.  Install other switch mounting screws and secure.
D.  Connect electrical leads to all switches. Refer to Wiring Diagram Manual if necessary.
NOTE:  Switches S89 and S91 are 115-volt ac switches. Switches S88 and S90 are 28-volt dc switches for airplanes with 20-4 Joule DC starting and continuous ignition system (115-volt ac switches for airplanes with 20 Joule AC Twin Pack Ignition System).
4.  Restore Airplane to Normal Configuration
A.  Install center brace in lower left forward part of pilot’s control stand.
B.  Install lower forward panels on pilot’s control stand.
C.  Close ignition circuit breakers on P6-2 circuit breaker panel.
May 15/79 74-31-11 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

K90483
Start Lever Switches Installation  504 
74-31-11Page 402   Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/79 

START LEVER SWITCH - ADJUSTMENT/TEST
1.  General
A.  The engine start levers must be properly rigged prior to switch adjustments to ensure synchronization of fuel and ignition system operations. Refer to Chapter 76 for engine start lever cable rigging procedures.
2.  Equipment and Materials
A.  Ohmmeter or continuity tester
B.  Airplane Control Surfaces Protractor - F52485-500, or 4MIT65B80301-1
C.  Spacer - F80154-1, 0.16 +0.01 inch thick
3.  Prepare to Adjust Start Lever Switches (Fig. 501)
A.  Open ignition circuit breakers for both engines on P6-2 circuit breaker panel.
B.  Check that start levers are in CUTOFF detent.
C.  Remove lower forward panels (both sides) from pilot’s control stand.
4.  Adjust Start Lever Switches (Fig. 501)
NOTE:  If slight adjustment is required, adjust cams on start drums and/or adjust the tabs on the actuator arms of the start lever switches.
A.  Loosen switch mounting bracket adjustment screws (both sides).
B.  Adjust switch mounting brackets so that all switches actuate when the start lever is positioned 2 to 8 degrees forward from the rigged cutoff (no load) position as determined using spacer. The switches shall remain actuated when the start lever is moved to the IDLE detent. The switches shall deactuate when the start lever is in the CUTOFF detent.
C.  Tighten switch mounting bracket adjustment screws (both sides).
D.  Test continuity of switches using an ohmmeter or continuity tester. There shall be continuity at the actuated position and no continuity at the deactuated position of the switches.
May 20/82 74-31-11 Page 501
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Engine Start Lever Switch Adjustment  507 
74-31-11  Figure 501 (Sheet 1)  Feb 01/74 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

535  Engine Start Lever Switch Adjustment 
Aug 15/80  Figure 501 (Sheet 2)  74-31-11 
Page 503 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

On airplanes with 20-4 Joule DC Starting and Continuous Ignition System, position the start levers in the IDLE detent and check for continuity again. In the IDLE detent the intermittent duty switches should be open, and the continuous duty switches should be closed.
WARNING:  ENSURE THAT CORRECT CONTINUITY IS MADE BEFORE CLOSING CIRCUIT BREAKERS. DAMAGE TO THE EXCITER UNIT MAY RESULT IF 28-VOLT DC AND 115-VOLT AC CIRCUITS ARE OPERATED SIMULTANEOUSLY.
5. Restore Airplane to Normal Configuration
A. Install lower forward panels on pilot’s control stand.
　
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