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ALL ú ú 01 Page 652 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(h)
Push the key for AILERON (LSK 1R).
(i)
Push the key for CONTINUE after you see the WARNING
instructions.
(j)
Ignore the surface test instructions, and push the key for CONTINUE.
(k)
Ignore the set the aileron trim to 0 degrees and set the flaps to 1 unit instructions. Push the key for CONTINUE.
(l)
The FMC-CDU displays engage A/P A to CMD. Engage the A autopilot to CMD.
(m)
The FMC-CDU displays engage A/P B to CMD. Engage the B autopilot to CMD.
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(10) Stop until the flow is stable.
(a)
Read the amperage or the flow value for hydraulic system A and write it on Fig. 605 for step 9 (A Aileron actuator + Elevator actuator + Basic reference with isolation valves open).
(b)
Read the amperage or the flow value for hydraulic system B and write it on Fig. 605 for step 10 (B Aileron actuator + Elevator actuator + Basic reference with isolation valves open).
S 866-155
(11)
Close the No. 1 through No. 6 isolation valves (in the tail compartment).
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(12)
Stop until the flow is stable.
(a)
Read the amperage or the flow value for hydraulic system B and write it on Fig. 605 for step 1 (B Aileron + Basic reference with the isolation valves closed).
(b)
Read the amperage or the flow value for hydraulic system A and write it on Fig. 605 for step 2 (A Aileron + Basic reference with the isolation valves closed).
(13)
Push the key for INIT/REF (CDU key) to get out of BITE.
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NOTE: This step disengages all the autopilot actuators.
____
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-00-00
ALL ú ú 01 Page 653 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 976-158
(14) Stop until the flow is stable.
(a)
Read the amperage or the flow value for hydraulic system A and write it on Fig. 605 for step 3 (A Basic reference with the isolation valves closed).
(b)
Read the amperage or the flow value for hydraulic system B and write it on Fig. 605 for step 4 (B Basic reference with the isolation valves closed).
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(15) Use the flow values on Fig. 605 to calculate these leakages:
(a)
Subtract the step 3 flow from the step 2 flow and write this for step 5 (A Aileron autopilot actuator leakage).
(b)
Subtract the step 4 flow from the step 1 flow and write this for step 6 (B Aileron autopilot actuator leakage).
(c)
Subtract the step 8 flow and the step 5 flow from the step 9 flow. Write this for step 11 (A Elevator autopilot actuator leakage)
(d)
Subtract the step 7 flow and the step 6 flow from the step 10 flow. Write this for step 12 (B Elevator autopilot actuator leakage)
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(16) Do the procedure to put the airplane back to its usual condition.
TASK 29-00-00-706-262
9. Internal Leak Check for the Rudder Power Control Unit (Procedure 5)____________________________________________________________________
A. General
(1)
Use this procedure to find the internal leakage of the rudder power control unit for hydraulic systems A or B.
(2)
You must find the changes in the flow of hydraulic fluid (during different conditions of operation) to find the internal leakage rate for each part. There are three procedures to measure the flow: the ammeter procedure, the flowmeter procedure, and the amp-clamp and multimeter procedure.
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