(2)
On the panel 30VU make sure that:
(a)
The APU BLEED pushbutton switch is in the off position (the ON legend is off).
(b)
The ENG 1 BLEED and the ENG 2 BLEEDpushbutton switches are in the off position (the OFF legends are on).
(c)
The warning notice to tell persons not to operate these pushbutton switches is in position.
(3)
On the HP ground connector the warning notice to tell persons not to supply ground air is in position.
4. Procedure
_________
**ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
(Ref. Fig. 401/TASK 21-52-22-991-001) R **ON A/C 151-199, 401-499,
(Ref. Fig. 401A/TASK 21-52-22-991-001-A) **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399,
Subtask 21-52-22-420-051
A. Installation of the Fan Plenum Chamber NOTE : It is no longer required that the gasket (4) be fitted on
____
installation of the fan plenum chamber.
(1)
Remove the protective cover from the cooling elements of the primary heat exchanger (5).
(2)
Make sure that the parts retained from the removed component are clean and in the correct condition.
(3)
Clean the component interface and/or the adjacent area.
(4)
Make sure that the lip seal (6) is correctly installed and that it is in a good condition. If it is not in a good condition, or is not correctly installed, replace the fan plenum chamber (3).
(5)
Put the fan plenum chamber (3) in position on the primary heat exchanger (5) and install the washers (2) and the screws (1).
(6)
TORQUE the screws (1) to between 0.35 and 0.45 m.daN (30.97 and 39.82 lbf.in).
(7)
Install the heat exchanger unit/s (Ref. TASK 21-52-24-400-001).
(8)
Install the ram air outlet/s (Ref. TASK 21-61-52-400-003).
(9) Install the pipe assembly/ies (Ref. TASK 21-52-23-400-001). R **ON A/C 151-199, 401-499,
Subtask 21-52-22-420-051-A
A. Installation of the Fan Plenum Chamber
(1)
Remove the protective cover from the cooling elements of the primary heat exchanger (4).
(2)
Make sure that the parts retained from the removed component are clean and in the correct condition.
R 1EFF : ALL 1 21-52-22Page 413 1 1 Aug 01/05 1 1 1CES 1
(3)
Clean the component interface and/or the adjacent area.
(4)
Put the fan plenum chamber (3) in position on the primary heat exchanger (4) and install the washers (2) and the screws (1).
(5)
TORQUE the screws (1) to between 0.35 and 0.45 m.daN (30.97 and 39.82 lbf.in).
(6)
Installation of the Bonding Strap NOTE : This work step is only applicable to plenum chamber P/N
____
1816A0000-01.
(a) Put the bonding strap (6) in position and install the screw (5), the washer (7) and the nut (8) (Ref. TASK 20-28-00-912-004).
(7)
Install the heat exchanger unit/s (Ref. TASK 21-52-24-400-001).
(8)
Install the ram air outlet/s (Ref. TASK 21-61-52-400-003).
(9) Install the pipe assembly/ies (Ref. TASK 21-52-23-400-001). R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
Subtask 21-52-22-865-053
B. Close Circuit Breakers
(1) Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
R (a) FOR 10HM5
-1HH, 2HH, 3HH, 4HH, R (b) FOR 11HM5
-21HH, 22HH, 23HH, 24HH.
R **ON A/C 401-499,
Subtask 21-52-22-865-053-A
B. Close Circuit Breakers
(1) Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
R (a) FOR 10HM5
-49HH, 50HH, 51HH, 52HH, R (b) FOR 11HM5
-53HH, 54HH, 55HH, 56HH.
**ON A/C ALL
Subtask 21-52-22-710-050
C. Test of the Fan Plenum Chamber
(1)
Do the pre-conditioning through the HP ground connector or with the APU (Ref. TASK 12-33-21-618-001) (Ref. TASK 12-33-21-618-001).
(2)
Do a leak check of the fan plenum chamber connections. NOTE : Leaks are not permitted.
____
(3)
After approx. 15 minutes stop the pre-conditioning (Ref. TASK 12-33-21-618-001) (Ref. TASK 12-33-21-618-001).
5. Close-up
________
Subtask 21-52-22-410-052
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