(3)  
Test speed brake lever actuator control and indicating circuits.

NOTE: Airplane weight must be on landing gear during this test.
(a)  
Ensure that following circuit breakers are closed: All INDICATOR LIGHTS, MASTER DIMMING BUS; DIM AND TEST; FLIGHT CONTROL VALVES; SPOILER SHUTOFF VALVES; AUTO SPEED BRAKE; and all ANTISKID.

(b)  
Check that speed brake control lever is in DOWN position.

(c)  
Press speed brake indicator test switch 3 to reset speed brake control lever actuator.

(d)  
Move speed brake control lever from DOWN to ARMED detent.

(e)  
Check that ARMED light on center panel is illuminated.

(f)  
Actuate speed brake indicator test by pushing test switch TEST 1 and check that: 1) ARMED light is extinguished. 2) DO NOT ARM light is illuminated.

(g)  
Repeat step (f) except actuate TEST 2 speed brake indicator test switch and then TEST 3 switch.

NOTE:  Takeoff warning horn may sound if throttles are advanced when TEST 3 switch is actuated.

(h)  
Position LIGHTS switch on P2-1 panel to DIM and check that ARMED light dims.

(i)  
Position LIGHTS switch to BRT and check that ARMED light returns to its original brightness.

(j)  
Remove protective cover at test connector J2 on antiskid control shield. Antiskid control shield is located on E3-2 shelf in electrical equipment area. Install antiskid -autobrake - auto speed brake tester.

NOTE:  Before installing, check that all switches on tester are off.

(k)  
Set up tester as follows: 1) Place master switch to ON position. 2) Place WHEEL SPEED LO, LI, RO and RI switches in OFF position. 3) Set rotary VELOCITY potentiometer to a position greater than 62 knots. 4) Place WHEEL SPEED velocity switch in VEL position.

NOTE:  Throughout the test, LO, LI, RO and RI switches referred to are located in tester WHEEL SPEED section. Disregard all lamps on tester during test.

(l)  
Place speed brake lever in ARMED position. Check that ARMED light illuminates.

(m)  
Place LO switch in ON position. Check that DO NOT ARM light illuminates and spoilers do not actuate.

(n)  
Place LO switch in OFF position. Check that ARMED light illuminates.

(o)  
Repeat steps (m) and (n) for LI, RI and RO switches.

(p)  
With speed brake in ARMED position, place switches RO and RI in ON position. Check that speed brake lever automatically moves to UP position and all spoilers extend.

(q)  
Place switch RO and RI in OFF position.

(r)  
Place speed brake lever in DOWN and locked position. 1) Check that all spoilers retract. 2) Press speed brake indicator test switch 3 to reset speed brake lever actuator. 3) Place speed brake lever in ARMED position, and check that SPEED BRAKE

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ARMED light comes on.
NOTE:  DO NOT ARM light may momentarily come on if switches are not operated simultaneously.
(s)  
Repeat steps (p) thru (r) for the following pairs of switches: 1) RO and LO 2) LI and LO 3) LI and RI

(t)  
Place speed brake lever in ARMED position.

(u)  
Place RI and RO switches in ON position. Check that all spoilers extend.

(v)  
Move No. 1 thrust lever 12.5 ± 1 degrees forward from idle position and check that: 1) All spoilers return to full down position in less than 1 second. 2) Speed brake control lever returns to DOWN detent. 3) ARMED and DO NOT ARM lights are extinguished.

(w)  
Return thrust lever to idle position.

(x)  
Repeats steps (t) thru (w) except move No. 2 thrust lever 12.5 ±1 degrees forward from idle position instead of thrust lever No. 1.

(y)  
Repeat steps (t) thru (w) except actuate No. 3 speed brake test switch on center panel instead of thrust lever No. 1.

(z)  
Place inboard antiskid switch in OFF position and speed brake lever in ARMED position. Check that ARMED light illuminates.

(aa) Simultaneously place RO and RI switches in ON position. Check that DO NOT ARM light illuminates and spoilers do not actuate.
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(ab) Place RO and RI switches in OFF position. Check that ARMED light illuminates and spoilers do not actuate.
(ac) Simultaneously place LI and RI in ON and then OFF position. Check that ARMED light remains on and spoilers do not actuate.
　
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