(n)  
Set the captain's and the observer's ALT/NORM switch to the ALT (alternate) position. 1) Make sure you hear no interphone sounds at the captain's

 and the observer's station.

 (o)  
Close the circuit breaker:

 1)  P6 Load Control Center - Right
 a) C165, VHF-1 COMM

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (p)  
Make sure that only the VHF-1 microphone light comes on, at the captain's and the observer's ASP.

 (q)  
Make sure the VHF-1 radio is the only one you can use to speak to a ground station.

 (r)  
Make sure you can hear the sidetone at the first officer's station with the first officer's boom microphone headset.

 (s)  
Make sure you can use the MASK/BOOM switch to set the BOOM or the oxygen mask microphone on the captain's ASP.

 (t)  
Set the ALT/NORM switches back to the NORM (normal) position on the captain's and observer's ASP.

 (u)  
Open the circuit breaker:

 1)  P6 Load Control Center - Right
 a) C560, INTERPHONE POWER, F/O, NO. 2 BUS
 b) C166, VHF-2 COMM

 (v)  
Make sure you can speak and hear between the captain's and the first officer's ASP.

 (w)  
Open the circuit breaker:

 1)  P6 Load Control Center - Right
 a) C561, INTERPHONE POWER, F/O, BATT

 (x)  
Make sure you can hear no interphone sound at the first officer's ASP.

 (y)  
Close the circuit breaker:

 1)  P6 Load Control Center - Right
 a) C166, VHF-2 COMM

 (z)  
Make sure that only the VHF-2 microphone light comes on, at the first officer's ASP. (aa) Make sure the VHF-2 radio is the only one you can use to speak to a ground station. (ab) Make sure you cannot speak or hear between the captain's station and an attendant station on the service interphone. (ac) Make sure you can speak and hear on the flight interphone system between the captain and the observer. (ad) Make sure you can use the MASK-BOOM switch to set the BOOM or the oxygen mask microphone on the first officer's ASP. (ae) Close the circuit breaker: 1) P6 Load Control Center - Right a) C560, INTERPHONE POWER, F/O, NO. 2 BUS (af) Make sure you can speak and hear between the captain and the first officer on the flight interphone system. (ag) Make sure you can speak and hear between the captain's station and the attendant stations on the service interphone. (ah) Open the circuit breaker:

 1)  P6 Load Control Center - Right
 a) C166, VHF-2 COMM

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (ai) Set the ALT/NORM switch to the ALT (alternate) position on the first officer's ASP. 1) Make sure you hear no interphone sound on the first
 officer's ASP. (aj) Close the circuit breaker: 1) P6 Load Control Center - Right a) C166, VHF-2 COMM (ak) Make sure the VHF-2 microphone light on the first officer's ASP comes on. (al) Make sure you can only use the VHF-2 radio to speak to a ground station. (am) Make sure you can speak between the captain and the observer on the flight interphone. (an) Make sure you can use the MASK/BOOM switch to set the BOOM or the oxygen mask microphone on the first officer's ASP.
 (ao) Set the ALT/NORM switch back to the NORM (normal) position on the first officer's ASP. 1) Make sure you can speak and hear between the first officer
 and the captain.
 (ap) Close the circuit breaker:

 1)  P6 Load Control Center - Right a) C240, INTERPHONE POWER, CAPT, BATT b) C560, INTERPHONE POWER, F/O, NO. 2 BUS c) C561, INTERPHONE POWER, F/O, BATT
 S 865-036
 (5)
Put the flight interphone system back to the usual condition:

 (a)
Put the ASP back to their usual condition.

 (b)
Put the ADF or the VHF radio back to the usual condition.
　
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