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2) Two MASTER CAUTION lights illuminate.
3) OVHD master caution annunciator light illuminates.
4) Stall warning module test indicator stops rotating.
5) Control column shaker stops shaking.

NOTE:  With switch held in TEST position, angle of airflow sensor vane is heated with 115 volts ac and OFF light will be extinguished. With switch returned to NORMAL position, there will be no power to vane heater and OFF light will remain illuminated until airplane engines are started.
(2)  
Test failure sensing circuit.

(a)  
Open STALL WARN - DC circuit breaker at circuit breaker panel P18-2.

(b)  
Hold stall warning module switch in TEST position. Check that OFF light remains illuminated.

(c)  
Close STALL WARN - DC circuit breaker.

(d)  
Hold stall warning module switch in TEST position. Check that OFF light
extinguishes.

(3)  
Test master caution, master test and master dim.

(a)  
Hold LIGHTS switch at P2-1 panel in TEST position. At same time hold stall warning module switch in TEST position. Check that the following occurs: 1) Stall warning module OFF light remains illuminated.

2) Stall warning module test indicator rotates.
3) Control column shaker operates.

(b)  
Release LIGHTS switch. Check that all lights in step (a)1) go off.

(c)  
Release stall warning module TEST switch. Check that the following occurs: 1) Stall warning module OFF light comes on. 2) Two MASTER CAUTION lights come on. 3) OVHD master caution annunciator light comes on and other master caution

annunciator lights may come on.
4) Stall warning module test indicator stops rotating.
5) Control column shaker stops shaking.

(d)  
Press and release either of two MASTER CAUTION lights. Check that the following occurs: 1) Both MASTER CAUTION lights go off. 2) OVHD master caution annunciator light goes off. 3) Stall warning module OFF light remains on.

(e)  
Press and release OVHD master caution annunciator light. Check that the following occurs:

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NOTE: Do not cancel MASTER CAUTION light.
1) Both MASTER CAUTION lights come on.
2) OVHD master caution annunciator light comes on.
3) Stall warning module OFF light remains on.

(f)  
Place LIGHTS switch at P2-1 panel in BRT position. Check that stall warning module OFF light brightens.

(g)  
Return LIGHTS switch to DIM. Check that OFF light becomes dim.

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(4)  Test system performance.
(a)  Check angle of airflow sensor.
1)  On airplanes with CONRAC sensor, slowly rotate sensor vane through 360 degrees using light finger pressure. Check that vane rotates without binding or variations in torque and that shaker does not shake. Check that 0.090-inch diameter drain hole is open and clear of obstructions.
WARNING:  SENSOR VANE COULD CAUSE BURNS. ALLOW SUFFICIENT TIME TO COOL BEFORE HANDLING.
CAUTION:  DO NOT SPIN VANE. DAMAGE TO SYNCHROS MAY OCCUR.
2)  On airplanes with Rosemount sensor, slowly rotate sensor vane between stops using light finger pressure. Check that vane rotates without binding or variations in torque and that shaker does not shake.
(b)  
Place stall warning module switch to HTR OFF position. Check that stall warning module OFF light comes on and OVHD master caution light remains on.

(c)  
Attach portable calibrator or adapter kit assembly on angle of airflow sensor.

TABLE I
FLAP POSITION (Flap Lever Detent Position)  VANE ANGULAR POSITION Vane UP is positive) (±0.7 degrees) 
0 1 2 5 10 15 25 30 40  -0.5° CW – AERODYNAMIC OFFSET *[1] +6.4° CCW + AERODYNAMIC OFFSET +6.4° CCW + AERODYNAMIC OFFSET +6.4° CCW + AERODYNAMIC OFFSET +6.4° CCW + AERODYNAMIC OFFSET +6.4° CCW + AERODYNAMIC OFFSET +6.4° CCW + AERODYNAMIC OFFSET +5.0° CCW + AERODYNAMIC OFFSET +3.0° CCW + AERODYNAMIC OFFSET 

*[1] AERODYNAMIC OFFSET IS ON TRAILING EDGE OF ROSEMOUNT SENSOR VANE ONLY.
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(d)  
Set vane trailing edge down approximately 20 degrees from zero position on calibrator. Check that shaker does not shake. Rotate vane slowly up from no-shake position until control column shakes. Slowly rotate vane 10 degrees into shake region. Check that shaker continues to shake control column.
　
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