29-11-00
ALL ú ú 06 Page 680Y ú Dec 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
FULL CHECK Component Check for the Left Hydraulic System Figure 610 (Sheet 2)
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29-11-00
ALL ú ú 06 Page 680Z ú Dec 20/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
NO. STEP PROCEDURE WHEN DONE CHECK GPM IN FLOW (+) NULLCALC. LEAKAGE (-) SEAL APPROVED LEAKAGE CORRECTIVE ACTION/BAD COMPONENT/COMMENTS
11 PUT THE L HYD PUMPS ELEC IF THE PUMP PRESS LIGHT IS
SWITCH TO ON AND MAKE ON, REPAIR THE PRESSURE INDI-
SURE THE PUMP PRESS LIGHT CATION CIRCUIT AND DO STEP 10
IS OFF. AGAIN.
12 PUT THE L HYD PUMPS ELEC
SWITCH TO OFF.
13 MAKE SURE THE EDP LOW IF THE EDP PRESS LIGHT IS
PRESSURE LIGHT IS ON. DO OFF, REPLACE THE CHECK VALVE
NOT START THE YAW DAMPER IN THE EDP FILTER MODULE
AND AUTOPILOT CHECK (AMM 29-11-17/401). IF YOU
(FIG. 614) UNTIL THE START THE YAW DAMPER AND AUTO-
LIGHT STAYS ON PILOT CHECK (FIG. 614) BEFORE
10 SECONDS. A BAD CHECK VALVE IS REPLACED,
THE LEAKAGE CALCULATIONS WILL
NOT BE CORRECT.
14 PUSH THE L HYD PUMPS ENG IF THE LIGHT GOES OFF IN
SWITCH TO OFF. MAKE SURE 10 SECONDS, THE EDP LEAKAGE
THE EDP LOW PRESSURE DID NOT LET THE CHECK VALVE
LIGHT STAYS ON FOR AT LEAKAGE CAUSE THE LIGHT TO GO
LEAST 10 SECONDS. DO NOT OFF IN STEP 13. REPLACE THE
START THE YAW DAMPER AND CHECK VALVE IN THE EDP FILTER
AUTOPILOT CHECK MODULE (AMM 29-11-17/401). IF
(FIG. 614) UNTIL THE YOU START THE YAW DAMPER AND
LIGHT STAYS ON AUTOPILOT CHECK (FIG. 614)
10 SECONDS. BEFORE A BAD CHECK VALVE IS
REPLACED, THE LEAKAGE CALCU-
LATIONS WILL NOT BE CORRECT.
15 FEEL THE RETURN LINE FROM IF THE RETURN LINE IS HOTTER
THE EDP PRESSURE/CASE THAN THE FLIGHT CONTROL RETURN
DRAIN FILTER MODULE. DO LINES, THE SYSTEM PRESSURE
NOT START THE YAW DAMPER RELIEF VALVE HAS TOO MUCH
AND AUTOPILOT CHECK LEAKAGE. REPLACE THE PRESSURE
(FIG. 614) IF THE PRES- RELIEF VALVE IN THE EDP FILTER
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