1)  Make sure you hear a low chime sound in the passenger cabin.

 (l)  
Put the "NO SMOKING" sign switch to the "OFF" position.

 1)  Make sure you hear a low chime sound in the passenger cabin.
 S 865-588
 (8)  Put the Airplane Back to the Usual Condition:
 (a)  
Put all the hand microphones back in the holders.

 (b)  
Put the Audio Selector Panels (ASP) back to the usual condition (Ref 23-51-00/501).

 (c)  
AIRPLANES WITH A TAPE REPRODUCER IN THE EE BAY; Turn the MUSIC OFF switch on the forward attendant panel, P13, to the OFF position.

 (d)  
AIRPLANES WITH A TAPE REPRODUCER ON THE WALL; Push the STOP button on the tape reproducer. 1) Push the 2 digit code (90) on the keyboard of the tape

 reproducer. 2) Push the MUSIC "1" button to open the cassette door on the
 tape reproducer. 3) Put the music tape into the tape reproducer. 4) Close the cassette door on the tape reproducer. 5) Push the MUSIC "1" button on the tape reproducer. 6) Push the "START" button on the tape reproducer.
 a) Make sure you hear clear music on all of the speakers. 7) Push the STOP button on the tape reproducer.
 S 865-361
 (9)  Remove electrical power if it is not necessary (Ref 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 TASK 23-31-00-755-403
 3.  System Flight Mode Test_______________________
 A.  General
 (1)  
This test makes sure the sound level of the speakers in the passenger cabin increases by approximately 6 dBs when the engines are running.

 (2)  
This test checks the sound level in the airplane with the low oil pressure switch from the #1 engine, or the #1 and #2 engines, connected to the PA amplifier.

 (3)  
If the #2 engine low oil pressure switch is not connected to the PA amplifier do not do step F.

 B.  References
 (1)  24-22-00/201, Manual Control.
 C.  Standard Tools and Equipment
 (1)  
Random Noise Generator - Model 543-1, Primex

 (2)  
Sound Level Meter - 1558, General Radio

 D.  Prepare for the Test
 S 865-405
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-411

 (2)  
Connect the noise generator to a microphone jack in the Flight Compartment.

 S 865-412

 (3)  
Set the noise generator PWR/PTT switch to ON.

 S 865-413

 (4)  
Push the PA microphone selector switch on the audio selector panel.

 S 755-406

 (5)  
Measure the sound level of the speakers:

 (a)  
Set the sound level meter to SLOW and C.

 (b)  
Move the sound level meter across one of the main PA passenger cabin speaker panel.

 (c)  
Write the value down.

 E.  Test the #1 Low Oil Pressure Switch
 S 865-415
 (1)  
Remove the electrical connector from the low oil pressure switch on the #1 engine.

 S 755-416

 (2)  
Measure the sound level of the speakers:

 (a)  
Move the sound level meter across the same speaker panel.

 (b)  
Write the value down.

 1)  Make sure the value is approximately 6 dBs more than the value you measure in step D. (5) (c).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 S 865-417
 (3)  
Reconnect the electrical connector to the low oil pressure switch on the #1 engine.

 S 755-418

 (4)  
Measure the sound level across the same speakers.
　
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