(7)  
Make sure the drain plugs are installed.

 S 425-097
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737-300/400/500MAINTENANCE MANUAL
 S 035-098
 (8)  
Make sure the regulated air pressure line is removed from the two pitot tubes on the fin.

 S 865-115

 (9)  
Do this task: "Put the Elevator Hydraulic Systems A and B Back to the Condition Before the Pressurization" (AMM 27-31-00/201).

 TASK 27-31-00-745-068
 16. System Test - Hydraulic Isolation System (With the DFCS computer BITE)______________________________________________________________________
 A. Standard Tools and Equipment
 (1)  
Scale - 0-2 feet

 B.
References

 (1)  
AMM 27-31-00/201, Elevator and Tab Control System

 C.
Access

 (1)  
Location Zones
 101 Control Cabin, LH
 102 Control Cabin, RH
 711 Elevator and Tab, LH
 712 Elevator and Tab, RH

 D.
Procedure

 S 745-063
 (1)  
Do the test of the hydraulic isolation system with the DFCS computer BITE.

 (a)  
Pressurize the elevator hydraulic systems A and B (AMM 27-31-00/201).

 (b)  
Remove locking bar to get access to the isolation valves.

 (c)  
Close the isolation valves 1 and 4.

 (d)  
Open the isolation valve 1. 1) Make sure that elevator feel actuator body moves

 approximately 1.00-1.73 inches forward. 2) Close the isolation valve 1.

 (e)  
Open the isolation valve 4. 1) Make sure that the elevator feel actuator body moves

 approximately 1.00-1.73 inches aft. 2) Open the isolation valve 1.

 (f)  
Push the INIT/REF key on FMCS CDU.

 (g)  
Push the line select key (LSK) that is adjacent to <INDEX.

 (h)  
Push the LSK that is adjacent to MAINT>

 (i)  
Push the LSK that is adjacent to <DFCS.

 (j)  
Push the NEXT PAGE key on the CDU.

 (k)  
Push the LSK that is adjacent to <RIGGING.

 (l)  
Push the LSK that is adjacent to <ELEVATOR (50.00).

 (m)  
Push the LSK that is adjacent to <ELEV AUTH SINGLE (51.00).

 (n)  
Push the LSK that is adjacent to <CONTINUE (51.20).

 (o)  
Push the LSK that is adjacent to <CONTINUE (51.21). 1) Engage the A/P CHAN A.

 (p)  
Close the isolation valve 3.

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 (q)  
Push the LSK that is adjacent to <CONTINUE (51.22). 1) Make sure that elevator does not move.

 (r)  
Open the isolation valve 3. 1) Make sure that the elevator moves.

 (s)  
Push the LSK that is adjacent to <CONTINUE (51.23). 1) Make sure that the elevator aligns with the index mark.

 (t)  
Push the LSK that is adjacent to <CONTINUE (51.24). 1) Make sure that the elevator moves down.

 (u)  
Push the LSK that is adjacent to <CONTINUE (51.25).

 (v)  
Push the LSK that is adjacent to CONTINUE (51.26). 1) Make sure that the elevator aligns with the index mark and the A/P CHAN A disengages.

 2)  Make sure that the CDU displays DO YOU WANT TO INSERT ANOTHER H/O CONDITION?

 (w)  
Push the LSK that is adjacent to <YES (51.26).

 (x)  
Push the LSK that is adjacent to <CONTINUE (51.20). 1) Engage the A/P CHAN B.

 (y)  
Push the LSK that is adjacent to <CONTINUE (51.21). 1) Close the isolation valve 6.

 (z)  
Push the LSK that is adjacent to <CONTINUE (51.22). 1) Make sure that the elevator does not move. (aa) Open the isolation valve 6. 1) Make sure that the elevator moves. (ab) Push the LSK that is adjacent to <CONTINUE (51.23). 1) Make sure that the elevator aligns with the index mark. (ac) Push the LSK that is adjacent to <CONTINUE (51.24).
　
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