The overpressure valves are sensitive to differential air pressures. The valves open to bleed off excessive pressure when the belly fairing FWD sections are in an overpressure condition. This operation maintains a normal pressure throughout the belly fairing structure at all aircraft altitudes. Each valve has a large piston positioned to close a bleed hole cut in the structure. The piston is held in the normally closed position under spring tension. Any overpressure will act on the piston and force the piston to open against spring tension. As the piston opens, the overpressure bleeds into the belly fairing AFT sections until an equal pressure again exists.
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53-39-00Page 3
MISCELLANEOUS (EG : DRAINS) - INSPECTION/CHECK
______________________________________________
TASK 53-39-00-210-001
R R Operational Check of Rubber Flap Drain Valve Holes in Pressure Floor from MLG Bay
1. Reason for the Job__________________
Refer to the MPD TASK: 533900-01
2. Job Set-up Information______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
RR No specific No specific access platform 0.5 m (1 ft. 8 in.) 1 PROBE - NON METALLIC, FLEXIBLE
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
32-12-00-010-001 Open the Main Gear Doors for Access
32-12-00-410-001 Close the Main Gear Doors after Access
53-39-00-991-001 Fig. 601
3. Job Set-up__________
Subtask 53-39-00-010-050
A. Get Access
(1) Open the main landing-gear doors (Ref. TASK 32-12-00-010-001).
WARNING : PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION
_______
BEFORE YOU START A TASK ON OR NEAR:
-
THE FLIGHT CONTROLS
-
THE FLIGHT CONTROL SURFACES
-
THE LANDING GEAR AND THE RELATED DOORS
-COMPONENTS THAT MOVE.
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53-39-00Page 601
(2) Put the access platform in position under the main landing-gear bay.
4. Procedure_________
(Ref. Fig. 601/TASK 53-39-00-991-001)
Subtask 53-39-00-210-050
R A. Inspection Procedure
R R R (1) Do the operational check of the drain holes of the rubber flap drain-valves in the pressure floor from the main landing-gear bay:
R R R (a) Make sure that the drain holes in the forward ceiling area of the landing gear bay are not blocked.
R R (b) If a drain hole is blocked, you must remove the blockage.
R R (c) Carefully push a PROBE - NON METALLIC, FLEXIBLE into each drain hole and make sure that the rubber seal operates correctly.
5. Close-up________
Subtask 53-39-00-410-050
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Remove the access platform(s).
(3) Close the main landing-gear doors (Ref. TASK 32-12-00-410-001).
(4) Remove the warning notice(s).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
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Nov 01/03
R FWD Drain Holes - Component Location Figure 601/TASK 53-39-00-991-001
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CES
VALVE - OVERPRESSURE - REMOVAL/INSTALLATION
___________________________________________
TASK 53-39-41-000-001
Removal of the Overpressure Valve
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific access platform 1.75 m (5 ft. 9 in.)
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
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