S 214-021

 (5)  
Make sure the L PACK and R PACK switches on the P5-10 panel are in the OFF position.

 S 714-022

 (6)  
Set the LIGHTS switch on the P2-1 center instrument panel momentarily to the TEST position and make sure these lights come on and then go off:

 (a)  
AUTO FAIL

 (b)  
OFF SCHED DESCENT

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737-300/400/500MAINTENANCE MANUAL
 (c)  
STANDBY

 (d)  
MANUAL

 (e)  
L AND R PACK lights

 (f)  
L and R BLEED TRIP OFF

 (g)  
DUAL BLEED

 S 714-023
 (7)  Do a test of the overheat indication system:
 (a)  
Press the OVHT TEST button on the P5-10 panel.

 (b)  
Make sure the WING-BODY OVERHEAT lights come on.

 S 714-030
 (8)  Do a test of the recirculation fan:
 (a)  
Put the RECIRC FAN switch on the P5-10 panel in the AUTO position.

 (b)  
Make sure air flow can be detected from the outlets in the passenger cabin.

 (c)  
Put the RECIRC FAN switch in the OFF position.

 S 714-028
 (9)  Do a test of air conditioning system pressurization:
 (a)  
Supply pneumatic power (AMM 36-05-00/201).

 (b)  
Make sure the ISOLATION VALVE switch is in the CLOSE position.

 (c)  
Put the APU BLEED switch to the ON position.

 (d)  
Make sure pressure shows on the pressure gage.

 (e)  
Put the L PACK switch to the AUTO position.

 (f)  
Make sure the indication on the pressure gage decreases.

 (g)  
Put the L PACK switch to the OFF position.

 (h)  
Put the ISOLATION VALVE switch to the OPEN position.

 (i)  
Put the R PACK switch to the AUTO position.

 (j)  
Make sure the indication on the pressure gage decreases.

 (k)  
Put the R PACK switch to the OFF position.

 S 864-029
 (10) Put the airplane back to its usual condition:
 (a)  
Remove pneumatic power (AMM 36-05-00/201).

 (b)  
Put the APU BLEED switch to the OFF position.

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 (c)  Remove the electrical power if it it is not necessary (AMM 24-22-00/201).
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 FLEXIBLE FULL COUPLING - MAINTENANCE PRACTICES
______________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes a full flexible coupling. The second task installs a full flexible coupling.
 TASK 21-51-02-002-001
 2.  Flexible Full Coupling Removal (Fig. 201)______________________________
 A.  Procedure
 S 012-028
 (1)
Cut and remove the lockwire from the coupling.

 S 032-007

 (2)
Loosen the coupling nut.

 S 022-009

 (3)
Slide the couplings away from the joint.

 S 032-010

 (4)
Remove and discard the retaining rings.

 S 032-027
　
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