500 Nose Gear Hydraulic System Schematic
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Nose Gear Extension and Retraction Schematic 500
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NOSE GEAR EXTENSION AND RETRACTION - TROUBLE SHOOTING
1. General
A. Trouble shooting the nose gear retraction mechanism requires the airplane to be jacked for nose gear retraction per Airplane Jacking, Chapter 7. Hydraulic power from a variable flow hydraulic bench, or from the airplane hydraulic system may be used. With the airplane system in use, gear operation times and hydraulic pressure will be near normal.
WARNING: CHECK THAT GROUND LOCK ASSEMBLIES ARE INSTALLED IN MAIN LANDING GEAR TO PREVENT INADVERTENT OPERATION OF GEAR. INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT COULD RESULT IF GEAR RETRACTS.
B. Three men are required. One stationed in control cabin to operate the landing gear control lever, one to operate the hydraulic test bench (if used) and one stationed near the nose wheel well to observe gear action. Main gear ground lock assemblies must be installed (Ref 32-00-01), control cables correctly rigged, and hydraulic reservoirs filled to correct level.
NOTE: Do not jack the airplane for a second fault isolation task.
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500
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CONTINUED FROM PRECEDING PAGE
500
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WARNING: THIS PROCEDURE IS FOR THE FOLLOWING CONDITION:
THE AIRPLANE IS ON THE GROUND AND THE RED NOSE LANDING GEAR POSITION LIGHT IS ILLUMINATED. THE LANDING GEAR CONTROL HANDLE IS IN THE DOWN (DN) POSITION.
THIS CAN BE A VERY DANGEROUS CONDITION. IF THE NOSE LANDING GEAR RETRACTS, INJURY OR DEATH TO PERSONS AND DAMAGE TO EQUIPMENT CAN RESULT.
C. Do the steps that follow:
(1)
Stop all maintenance and loading activities causing the airplane to bounce, shake, or move.
WARNING: MOVEMENT OF THE AIRPLANE CAN CAUSE THE INADVERTENT RETRACTION OF THE NOSE LANDING GEAR IF IT IS NOT IN THE LOCKED POSITION AND THE GROUND LOCK MECHANISM IS NOT INSTALLED.
(2)
Make sure the configuration of the hydraulic systems is not changed.
NOTE: If hydraulic power is supplied, leave it on. If the hydraulic power is not supplied, leave it off.
(3)
Make sure the parking brake is set.
(4)
Make sure chocks are secured against the front and back of at least one set of main gear tires.
(5)
Make sure the main landing gear lock assemblies are installed (AMM 32-00-01/201).
(6)
Use ropes or a long pole to put a chock in front of the nose landing gear tires, if chocks aren’t already installed.
WARNING: DO NOT LET YOURSELF OR ANOTHER PERSON BE UNDER THE AIRPLANE WHEN YOU PUT THE CHOCK IN FRONT OF THE NOSE LANDING GEAR TIRE. IF THE NOSE LANDING GEAR RETRACTS, INJURY OR DEATH TO PERSONS AND DAMAGE TO EQUIPMENT CAN RESULT.
NOTE: Do not put a chock behind the nose landing gear. It will not help prevent an inadvertent retraction of the nose landing gear.
(7) Look through the nose landing gear viewing port to see if the visual lock indicator arrows on the lock mechanism indicate the lock mechanism is locked.
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NOTE: You can also look through the viewing part to see if the nose landing gear ground lock assembly is installed in the lock mechanism. If you can clearly see it and you are sure it is installed, then the lock mechanism is in the locked position.
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NOSE GEAR EXTENSION AND RETRACTION - ADJUSTMENT/TEST
1. General
A. The nose landing gear can be tested alone by jacking airplane nose only, and making certain lock assemblies (Ref 32-00-01) are installed in main gear. System A is pressurized by setting the parking brake and opening the interconnect valve (Ref Chapter 29).
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