(k)  
If continuity is not obtained at correct thrust lever position, adjust switch in mounting slots (if provided), bend tab + 1/4 degree on actuator arm, or adjust position of switch actuating cam on autothrottle clutch/drum support assembly (if applicable) (Ref 31-26-21/22).

(l)  
Remove ohmmeter and connect electrical wiring to switch terminals.

(m)  
Remove protractor with adapter, replace rig pin bracket, and close engine cowling.

(n)  
Close circuit breakers LANDING GEAR LIGHTS and ANTI-SKID FAIL WARN & PARK BRAKE on panel P6.

523 
31-26-0 Page 510  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/90 

(2)  Adjust Thrust Lever Actuated Takeoff Warning Switch S283 or S133 (Fig. 502, Sheet 1). [Airplanes with EPR Activated T/O Warn System]
NOTE:  The engine control system must be properly rigged prior to adjusting the switch (Ref 76-11-0 A/T).
(a)  
Open circuit breakers EPR WARN and AURAL WARN on panel P6.

(b)  
Retard associated thrust lever to idle stop.

(c)  
Place protractor with adapter on associated thrust lever and set protractor to 0 degree (Fig. 501).

(d)  
Disconnect electrical wiring from one set of takeoff warning switch terminals.

(e)  
Connect ohmmeter across terminals C and NO and check that switch is not actuated (no continuity through switch).

(f)  
Advance associated thrust lever until switch actuates (continuity through switch). Check that thrust lever is 12.5 +1 degrees forward of idle stop.

(g)  
If continuity is not obtained at correct thrust lever position, adjust switch in mounting slots (if provided), bend tab + 1/4 degree on actuator arm, or adjust position of switch actuating cam on autothrottle clutch/drum support assembly (if applicable) (Ref 31-26-21/22).

(h)  
Remove ohmmeter and connect electrical wiring to switch terminals.

(i)  
Close circuit breakers EPR WARN and AURAL WARN on P6 panel.

(3)  Adjust Flap Takeoff Warning Switch S130 (Fig. 502, Sheet 2)
(a)  
Provide trailing edge flap system A hydraulic power (Ref 27-51-0 MP).

(b)  
Retract flaps with the flap control lever to normal retracted position (zero-unit detent) and hold for 5 minutes.

(c)  
Remove No. 4 jackscrew fairing and record X dimension (Fig. 504) between No. 4 ball screw nut and its upstop.

(d)  
Move the flap control lever to the 25-unit detent and position the flaps electrically so that dimension X is an additional 25.96 to 26.11 inches from that recorded in step (c) (Ref 27-51-0 A/T).

(e)  
Remove the switch cover from the flap control unit located in the ceiling area of the right wheel well (Detail B, Fig. 502).

Feb 20/90  31-26-0

Takeoff Warning System Adjustment  501 
31-26-0  Figure 502 (Sheet 1)  Feb 20/89 
Page 512 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

501  Takeoff Warning System Adjustment 
Feb 20/89  Figure 502 (Sheet 2)  31-26-0 
Page 513 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Takeoff Warning System Adjustment  516 
31-26-0  Figure 502 (Sheet 3)  Jun 20/90 
Page 514 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

501  Takeoff Warning System Adjustment 
Feb 20/89  Figure 502 (Sheet 4)  31-26-0 
Page 515 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(f)  
Adjust takeoff warning switch toward its actuating cam until switch actuates.

NOTE:  Care must be taken to pre-position switch so that actuation takes place with switch body being moved toward cam.

(g)  
Lockwire switch retaining nuts.

(h)  
Replace switch cover on flap control unit.

(i)  
Position alternate flap switch to OFF.

(j)  
Place flap control lever at 0-unit detent.

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

(4)  Adjust Stabilizer Takeoff Warning Switches S131 or S546, Upper; S132, Lower.
(a)  
Open access door 3701 to stabilizer actuator compartment for access to switches.

(b)  
Ensure speed brakes are down and flaps are in takeoff range.

(c)  
Advance either engine thrust lever full forward.

(d)  
Move stabilizer in leading edge up (airplane nose down) direction. Check that warning horn sounds when dimension B is within the range for horn sounding (Table 1, Detail C, Fig. 502) for upper switch. Use trammel bar to measure dimension B, as shown. If horn does not sound within the required range of dimension B, adjust upper takeoff warning switch as follows: 1) Open LIGHTS and AURAL WARN circuit breakers on P6 panel. 2) Set dimension B as required for switch adjustment in Table 1 (Detail C). 3) Loosen but do not remove locknut securing switch arm to switch.
　
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