(a)  
Material: 1020 steel per MIL-S-7952, 15-5PH steel, 17-4PH steel per AMS 5643, Permalloy - HYMU (carpenter steel) or Molly Permalloy (Allegheny Ludlum)

(b)  
Size: For rectangular sensors - 1.5 x 0.75 x 0.05 inches For round sensors - 1.0 x 1.0 x 0.05 inches

(2)  
Deactuator bars for the proximity sensors:

(a)  
Material: 5052, 6061, 7076, or 2024 aluminum or sheet copper

(b)  
Size: For rectangular sensors - 1.5 x 0.75 x 0.05 inches For round sensors - 1.0 x 1.0 x 0.05 inches

C.  Prepare Aural Warning Devices Box for Test
(1)  
Provide electrical power.

(2)  
Check that following circuit breakers are closed:

(a)  
LANDING GEAR-LIGHTS circuit breaker on P6 panel

(b)  
LANDING GEAR-ANTISKID TEST circuit breaker on P6 panel

(c)  
AURAL WARN circuit breaker on P6 panel

(d)  
MASTER WARNING and CONTROL circuit breaker on P6 panel

(e)  
ENG #1 FIRE DET circuit breaker on P6 panel

(f)  
AURAL MACH AND AIRSPEED WARNING circuit breaker on P18 panel

(g)  
PASSENGER and CREW CALL circuit breaker on P18 panel 

(h)  
MACH WARN SYST #1 circuit breaker on P18 panel

(i)  
Airplanes with EPR actuated takeoff warning system: 1) EPR WARNING on P6 panel 2) ENG No. 1 and No. 2 EPR & L.G. WARNING on P6 panel

(3)  
Check that Selcal and associated radio system circuit breakers are closed, as applicable.

D.  Aural Warning Devices Box - Operational Test
(1)  
Make sure you have electrical power On (APU or external power).

(2)  
Put the flaps or the speed brakes in the UP position.

(3)  
Advance the thrust levers to the takeoff position and, on airplanes with EPR activated takeoff warning switches, press-to-test the EPR test switches on the engine accessory module (E3-2).

(a)  Make sure the Aural Warning Horn sounds.

(4)  
Retard the thrust levers or, on airplanes with EPR activated takeoff warning switches, release the press-to-test switches.

(a)  Make sure the Aural Warning Horn stops.
E.  Aural Warning Devices Box - System Test
(1)  
Advance both thrust levers full forward and set flap control lever to 1 unit detent. At either main gear, place an aluminum or copper shield between downlock sensor and activating bar on outboard side of strut. In similar manner, on passenger/cargo convertible airplane, shield secondary downlock sensor (Ref 32-61-0, Landing Gear Position Indicating and Warning System).

(2)  
Retard either thrust lever to idle stop and check that continuous warning horn sounds; then, advance thrust lever until horn stops sounding.

(3)  
Remove the aluminum or copper shield from downlock sensor.

(4)  
Retard both thrust levers to idle stop and set flap control handle to 0-unit detent.

(5)  
Check operation of intermittent warning horn as follows:

(a)  
On airplanes without EPR activated takeoff warning system, advance either thrust lever full forward and check that horn sounds; then, retard thrust lever until horn stops sounding.

(b)  
On airplanes with EPR activated takeoff warning system, advance both thrust levers full forward, then, press and hold ENGINE No. 1 (or No. 2) EPR test switch on engine accessory module at E3-2 electrical equipment shelf and check that horn sounds. Release test switch and check that horn stops sounding.

(6)  
Position and hold fire test switch on aft electronic panel to FIRE and check that bell sounds.

(7)  
Release fire test switch and check that bell silences.

(8)  
Press and hold mach airspeed warning test switch on aft overhead panel and check that clacker sounds.

(9)  
Release test switch and check that clacker silences.

(10)
On airplanes with two mach airspeed-warning systems, perform (8) and (9) for both MACH AIRSPEED WARNING TEST SWITCH NO. 1 and NO. 2 (Ref Chapter 34).

(11)
Press PILOT CALL switch at external power receptacle panel and check that hi chime sounds once.

(12)
On airplanes with Selcal, check Selcal chime signal as follows:

(a)  
Turn on Selcal system and associated radio system. Verify satisfactory communications with control tower, and have tower operator select airplane selcal code on tower control console.

NOTE: Airplane Selcal code is on placard located on pilots' main instrument panel.

(b)  
Have tower operator transmit Selcal code and check that chime sounds.

(c)  
Turn off Selcal system and radio system.
　
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