(b)
The access panel 197BB is removed (Ref. TASK 53-35-13-000-002).
(c)
The aircraft electrical circuits are energized (Ref. TASK 24-41-00-861-002).
(d)
On the panel 30VU: 1 The APU BLEED pushbutton switch is in the off position (the ON
_
legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in
_ the off position (the OFF legends are on).
3 The warning notice to tell persons not to operate these
_ pushbutton switches is in position.
(e) On the HP ground connector the warning notice to tell persons not to supply ground air is in position.
**ON A/C 301-399,
Subtask 21-43-51-860-050-A
C. Aircraft Maintenance Configuration
(1) Make sure that:
(a)
The access platform is in position at the access panel 197BB.
(b)
The access panel 197BB is removed (Ref. TASK 53-35-13-000-002).
(c)
The aircraft electrical circuits are energized (Ref. TASK 24-41-00-861-002).
(d)
On the panel 30VU: 1 The APU BLEED pushbutton switch is in the off position (the ON
_
legend is off).
2 The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in
_ the off position (the OFF legends are on).
3 The warning notice to tell persons not to operate these
_ pushbutton switches is in position.
(e) On the HP ground connector the warning notice to tell persons not to supply ground air is in position.
**ON A/C ALL
4. Procedure
_________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 401/TASK 21-43-51-991-001)
**ON A/C 301-399,
(Ref. Fig. 401A/TASK 21-43-51-991-001-A)
**ON A/C ALL
Subtask 21-43-51-420-050
A. Installation of the Trim Air Valve
(1)
Remove the blanking plugs from the disconnected line ends.
(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 O-rings (2) are in a good condition. If necessary replace the O-rings (2).
(5)
Put the O-rings (2) in position on the trim air valve (9) and on the air duct (1).
(6)
Put the trim air valve (9) in position and install the clamps (3). NOTE : Make sure that:
____
-
the trim air valve (9) is in the correct lateral position and,
-
the arrow on the trim-air valve body points in the direction of the airflow.
(7)
TORQUE the clamps (3) to between 0.51 and 0.56 m.daN (45.13 and 49.55 lbf.in).
(8)
Remove the lock pin (13) from the manual overide lever (10) and install it in the stowage hole (12).
(9)
Put the bonding strap (8) in position and install the screw (7), the washers (5) and the nut (4) (Ref. TASK 20-28-00-912-004).
(10)
Remove the blanking caps and connect the electrical connector (6).
(11)
Make sure that the work area is clean and clear of tool(s) and other items.
Subtask 21-43-51-865-054
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 30HN, 31HN.
Subtask 21-43-51-710-050
C. Test
(1) Do the operational test of the AFT cargo heating system (Ref. TASK 21-43-00-710-003).
5. Close-up
________ R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
Subtask 21-43-51-410-050
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 197BB (Ref. TASK 53-35-13-400-002).
(3)
Remove the access platform.
(4) Remove the warning notice(s).
**ON A/C 301-399,
Subtask 21-43-51-410-050-A
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 197KB.
(3)
Remove the access platform.
(4) Remove the warning notice(s).
**ON A/C ALL
Subtask 21-43-51-862-050
B. De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).
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