-
in the cockpit on the AIR COND Overhead Control Panel 30VU to tell persons not to push in the APU BLEED pushbutton switch,
- on the HP ground connector to tell persons not to pressurize the pneumatic system.
(2) Put the access platform(s) in position below the access panel 192FB.
Subtask 36-12-52-010-051
C. Remove the access panel 192FB.
4. Procedure
_________
(Ref. Fig. 601/TASK 36-12-52-991-002)
Subtask 36-12-52-220-050
A. Inspection of the Crossbleed Valve
(1) Examine the crossbleed valve for dents, scores and corrosion. R
R (2) Make sure that the electrical connector is correctly connected to the R crossbleed valve.
Crossbleed Valve 6HV
Figure 601/TASK 36-12-52-991-002
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R (3) Make sure that the clamps are correctly installed.
R R (4) Move the manual override-lever and position indicator three times to the fully open and closed position.
R R NOTE : Do this workstep only on crossbleed valves which have a manual____ override-lever installed.
R (a) Make sure that the butterfly plate moves freely.
R (b) Listen for the click as the butterfly plate closes.
5. Close-up________
Subtask 36-12-52-410-051
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Install the access panel 192FB.
Subtask 36-12-52-942-054
B. Put the aircraft back to its initial configuration.
(1) Remove the access platform(s).
(2) Remove the warning notice(s).
Subtask 36-12-52-865-054
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1HV, 2HV, 2HA1, 2HA2, 3HA1, 3HA2
GROUND COMPRESSED AIR SUPPLY SYSTEM - DESCRIPTION AND OPERATION
_______________________________________________________________
1. General_______ (Ref. Fig. 001)
On the ground, this system supplies HP air from an external air supply to a
number of systems (Ref. 36-11-00 and 36-12-00).
The system supplies bleed air to:
-the refrigerator unit packs,
-start the engine,
-
pressurize the hydraulic reservoir,
-
pressurize the waste water tank,
-air conditioning trim air valve.
2. Component Location__________________ (Ref. Fig. 001)
-------------------------------------------------------------------------------FIN I FUNCTIONAL DESIGNATION I PANELIZONEIACCESS I ATA I I I I DOOR I REF.
-------------------------------------------------------------------------------
7300HM CONNECTOR-HP GROUND 191 191DB 36-13-41
3. System Description__________________
The external air supplies the air through a HP ground connector of 3 in. dia. This connector is installed on the left side of the belly fairing. The connector contains with a non-return valve a built-in nipple. A duct connects the HP ground connector with the crossfeed duct. The joint of both ducts is on the left side of the crossfeed valve.
4. Component Description_____________________ (Ref. Fig. 002)
The housing of the HP ground connector and the non-return valve in it are made of stainless steel. A screwthread safeties the non-return valve in the housing. On one end of the housing you can connect the external air supply. The non-return valve has an intake ring, two hinge supports, a hinge pin, two valve flaps and a torsion spring. A smooth surface on the valve flaps closes against an equally smooth surface on the intake ring. Eight bolts attach the HP ground connector unit to the aircraft structure. A mark on the housing shows the flow direction of the open valve. In HP ground connector contour is in accordance with MS 33740 (ISO TC 20) requirements.
HP-Ground Connector
Figure 001
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HP-Ground Connector with Non-Return Valve
Figure 002
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5. Operation_________
On the ground, when no bleed air from the engines and the APU is available, the connected external air source supplies HP bleed air. The HP bleed air pushes the spring-loaded valve flaps of the non-return valve open and flows into the pneumatic systems of the aircraft. When the external air supply stops, a spring closes the valve flaps automatically. Thus no air flows out of the system when the engines or APU take over the air supply.
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