5. Close-up
________ Subtask 12-32-79-410-053
A. Close Access Make sure that the work area is clean and clear of tool(s) and other items.
(1) Close the oil tank access door :
FOR 1000EM1
437BL
FOR 1000EM2
447BL
Remove the warning notice(s).
PRE-CONDITIONING - DESCRIPTION AND OPERATION
____________________________________________
1. General
_______
The aircraft can be pre-conditioned on the ground with:
-
a ground air-supply unit through the LP ground connection (Ref. TASK 12-33-21-618-00100).
-
a ground air-supply unit through the HP ground connection (Ref. TASK 12-33-21-618-00101).
-the APU (Ref. TASK 12-33-21-618-00102).
GROUND AIR PRE-CONDITIONING - MAINTENANCE PRACTICES
___________________________________________________
TASK 12-33-21-618-001
Pre-conditioning through the LP Ground Connection
WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING_______ GEAR.
WARNING : MAKE SURE THAT THE FWD AVIONICS ACCESS DOOR 811 IS OPEN. WITH A_______ WARNING PLACARD ATTACHED TO IT. THE WARNING NOTICE MUST TELL PERSONS NOT TO CLOSE THE DOOR. THIS PREVENTS ACCIDENTAL PRESSURIZATION OF THE AIRCRAFT.
CAUTION : DO NOT USE CONDITIONED AIR FROM THE PACKS AT THE SAME TIME AS AIR_______ FROM THE LOW-PRESSURE GROUND UNITS. THIS CAN CAUSE DAMAGE TO THE CHECK VALVES.
R R R R CAUTION : MAKE SURE THAT THE GROUND AIR-SUPPLY UNIT IS NOT TOO NEAR THE_______ AIRCRAFT AND THAT THE ENGINE EXHAUST PIPE OF THE GROUND AIR- SUPPLY UNIT POINTS AWAY FROM THE AIRCRAFT. HEAT FROM THIS UNIT AND FROM THE EXHAUST CAN CAUSE DAMAGE TO THE AIRCRAFT STRUCTURE.
1. Reason for the Job__________________
For maintenance procedures.
2. Job Set-up Information______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific ground air-supply unit
3. Job Set-up__________
Subtask 12-33-21-010-050
A. Get Access
(1) Open the avionics-bay access door 811.
(2) Put a warning notice in position to tell persons not to close the avionics-bay access door 811.
(3)
Open the access door 191CB.
(4)
Connect the ground air-supply unit to the aircraft LP connector.
4. Procedure
_________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Subtask 12-33-21-618-050
A. Pre-conditioning through the LP Ground Connection
(1)
Start the ground air-supply unit and make sure that:
-
the airflow is between 54 kg.min (119.0495 lb.min) and 78 kg.min (171.9605 lb.min),
-
the supplied air pressure is not more than 40 mbar (0.58 psi),
(2)
Set the necessary output air temperature on the ground air-supply unit.
NOTE : Make sure that the supplied air temperature does not go above
____
70 deg.C (158.00 deg.F).
**ON A/C 301-399,
Subtask 12-33-21-618-050-A
A. Pre-conditioning through the LP Ground Connection
(1)
Start the ground air-supply unit and make sure that:
-
the airflow is between 63 kg.min (138.8911 lb.min) and 96 kg.min (211.6437 lb.min),
-
the supplied air pressure is not more than 40 mbar (0.58 psi),
(2)
Set the necessary output air temperature on the ground air-supply unit.
NOTE : Make sure that the supplied air temperature does not go above
____
70 deg.C (158.00 deg.F).
R **ON A/C ALL
Subtask 12-33-21-618-056
B. When the pre-conditioning is no longer necessary, stop the ground
air-supply unit.
5. Close-up
________ Subtask 12-33-21-410-050
A. Close Access
(1)
Disconnect and remove the ground air-supply unit from the aircraft LP connector.
(2)
Close the access door 191CB.
(3)
Close the avionics-bay access door 811.
(4)
Remove the warning notice(s).
(5)
Remove the ground support and maintenance equipment, the special and standard tools and all other items.
TASK 12-33-21-618-001- 01 Pre-conditioning through the HP Ground Connection WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
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