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NOTE: The green indicator light on the test box should come on and the rudder should move to
the right.
SUBTASK 27-21-00-710-088-001
(14) When the hydraulic flow becomes stable, record the amperage value from the ammeter as
Value # 3: ____________
SUBTASK 27-21-00-710-089-001
(15) Push the right rudder pedal until it touches the forward quadrant stop and hold.
SUBTASK 27-21-00-710-090-001
(16) When the hydraulic flow becomes stable, record the amperage value from the ammeter as
Value # 4: ____________
SUBTASK 27-21-00-710-091-001
(17) Put the right rudder pedal in the neutral position.
SUBTASK 27-21-00-710-092-001
(18) Calculate and record the difference in amperage values with this formula:
(a) Value # 4 minus Value # 3 : _______________ (amps)
SUBTASK 27-21-00-710-093-001
(19) Make sure the difference in amperage values is between -0.7 amps and 1.5 amps.
SUBTASK 27-21-00-710-094-001
(20) If the difference in amperage values is not in the given range, replace the rudder PCU.
NOTE: After installation of the new PCU, continue the system B portion of this check.
SUBTASK 27-21-00-710-095-001
(21) Put the RUDDER TRAVEL DIRECTION switch, on the test box, SPL-1805, in the OFF position.
NOTE: The green indicator light on the test box should go off. The rudder might move slowly to
the right or left as much as 3 degrees.
SUBTASK 27-21-00-710-096-001
(22) Put the YAW DAMPER POWER switch, on the test box, SPL-1805, to the OFF position.
NOTE: The red indicator light should go off.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 559
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
H. Rudder PCU Internal Leakage Check (Hydraulic System A)
SUBTASK 27-21-00-800-006-001
WARNING: BE CAREFUL WHEN YOU ACCESS THE P92 PANEL AND POWER IS SUPPLIED TO THE
PANEL. THERE IS A POTENTIAL FOR ELECTRIC SHOCK HAZARD. POSSIBLE INJURY
TO PERSONNEL AND DAMAGE TO EQUIPMENT CAN OCCUR.
(1) Get access to the R317 relay for the system A EMDP on the aft side of the P92 power distribution
panel.
NOTE: The P92 power distribution panel is in the main electronics equipment compartment.
SUBTASK 27-21-00-480-026-001
(2) Put the current meter, COM-2531 or clamp meter, COM-3837 around one of the three wires that
go forward from the R317 relay.
SUBTASK 27-21-00-710-097-001
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE RUDDER AND
THE PCU ACTUATORS. THE RUDDER AND PCU ACTUATORS MOVE QUICKLY. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(3) Put the FLT CONTROL A switch in the ON position.
NOTE: Make sure FLT CONTROL B switch is in the ON position.
SUBTASK 27-21-00-710-098-001
(4) Put the YAW DAMPER POWER switch, on the test box, SPL-1805, to the ON position.
NOTE: The red indicator light on the test box should come on. The rudder might move slowly
to the right or left as much as 3 degrees.
SUBTASK 27-21-00-710-099-001
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE RUDDER AND
THE PCU ACTUATORS. THE RUDDER AND PCU ACTUATORS MOVE QUICKLY. THIS
CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(5) Put the RUDDER TRAVEL DIRECTION switch on the test box to the LEFT position.
NOTE: The green indicator light on the test box should come on and the rudder should move to
the left unless it is already at the left position.
SUBTASK 27-21-00-710-100-001
(6) When the hydraulic flow becomes stable, record the amperage value from the ammeter as
Value # 5: ____________
SUBTASK 27-21-00-710-101-001
(7) Push the left rudder pedal until it touches the forward quadrant stop and hold.
SUBTASK 27-21-00-710-102-001
(8) When the hydraulic flow becomes stable, record the amperage value from the ammeter as
Value # 6: ____________
SUBTASK 27-21-00-710-103-001
(9) Put the left rudder pedal to the neutral position.
SUBTASK 27-21-00-710-104-001
(10) Calculate and record the difference in amperage values with this formula:
(a) Value # 6 minus Value # 5 : _______________ (amps)
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN 001-005, 155-157, 201-999 PRE SB 737-27-1253 27-21-00
Config 1
Page 560
Jun 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-21-00-710-105-001
(11) Make sure the difference in amperage values is between -0.7 amps and 1.5 amps.
SUBTASK 27-21-00-710-106-001
(12) If the difference in amperage values is not in the given range, replace the rudder PCU.
　
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