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737-300/400/500MAINTENANCE MANUAL
 (d)  Warm the engines (AMM 71-00-00/201).
 NOTE: It is not necessary to complete the engine warming
____
 before you proceed.

 S 633-044
 (5)  Activate the electrical/electronic systems.
 NOTE: Before electrical power is applied, visually make sure all
____ control lever positions agree with the movable control surfaces.
 (a)  
Make sure there is an electrical ground on the airplane (AMM 20-40-11/201). 1) Do the Park the Airplane (Normal Parking) procedure

 (AMM 10-11-00/201).

 (b)  
Make sure all switches that are not necessary are in the OFF position.

 NOTE: This does not include the switches to activate the
____
 systems.

 (c)  
Install the main batteries (AMM 24-31-11/201).

 (d)  
AIRPLANES WITH APU BATTERY;
 Install the APU battery (AMM 24-31-11/201).

 (e)  
Use the procedures in the Power Supply - Battery Pack Replacement (AMM 33-51-51/201) task to install the emergency light batteries.

 (f)  
Close all of the applicable circuit breakers for the electronic/electrical components.

 (g)  
Close all of the applicable circuit breakers on the overhead circuit breaker panels.

 (h)  
Close the circuit breakers on the main power distribution panels.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 CAUTION: DO NOT APPLY GROUND ELECTRICAL POWER BEFORE THE
_______ TEMPERATURE HAS REACHED -4°F (-20°C).
 (i)  Apply electrical power to all the electrical/electronic equipment for a minimum of 2 hours (AMM 24-22-00/201). 1) Do a test on the battery (AMM 24-31-11/201) to make sure
 the main battery is fully charged. 2) AIRPLANES WITH AN APU BATTERY; Make sure the APU is in the fully charged condition.
 CAUTION: DO NOT TURN ON THE EMERGENCY LIGHT SYSTEM IF POWER
_______ HAS NOT BEEN APPLIED TO THE INSTALLED SYSTEM WHILE THE AIRPLANE WAS PARKED FOR 6 DAYS OR MORE. DO NOT TURN ON THE SYSTEM FOR A MINIMUM OF 90 MINUTES AFTER YOU APPLY ELECTRICAL POWER. DO NOT DO A FUNCTIONAL TEST UNTIL THE BATTERIES HAVE BEEN CHARGED FOR A MINIMUM OF 90 MINUTES. THIS IS NECESSARY BECAUSE THE SYSTEM MUST BE CHARGED BEFORE IT IS ABLE TO OPERATE CORRECTLY.
 3)  Make sure the Emergency Light System battery packs are in the fully charged condition.
 NOTE: The battery packs in the emergency light power
____ supplies are continuously charged when electrical power is supplied to the airplane, unless the emergency light switches are set to the on mode. If the battery packs are fully drained, maximum time necessary to charge them is 90 minutes.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
737-300/400/500MAINTENANCE MANUAL
 CAUTION: DO NOT TURN ON THE EMERGENCY LIGHT SYSTEM IF POWER
_______ HAS NOT APPLIED TO THE INSTALLED SYSTEM WHILE THE AIRPLANE WAS PARKED FOR 6 DAYS OR MORE. DO NOT TURN ON THE SYSTEM FOR A MINIMUM OF 90 MINUTES AFTER YOU APPLY ELECTRICAL POWER. DO NOT DO A FUNCTIONAL TEST UNTIL THE BATTERIES HAVE BEEN CHARGED FOR A MINIMUM OF 90 MINUTES. THIS IS NECESSARY BECAUSE THE SYSTEM MUST BE CHARGED BEFORE IT IS ABLE TO OPERATE CORRECTLY.
 4)  Do the system test of the emergency light system (AMM 33-51-02/501).
 NOTE: The battery packs in the emergency light power
____ supplies are continuously charged when electrical power is supplied to the airplane, unless the emergency light switches are set to the on mode. If the battery packs are fully drained, maximum time necessary to charge them is 90 minutes.
　
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