(2)
Make sure that the lip seal (11) is correctly installed and that it is in a good condition. If necessary replace the plenum chamber (Ref. TASK 21-52-22-000-001) and (Ref. TASK 21-52-22-400-001).
(3)
Remove the protective cover from the cooling elements of the heat exchanger unit (7).
(4)
Install the inlet plenum (46):
(a)
For the left heat exchanger unit (10HM4), 1 Put the seals (43) and (47) and the inlet plenum (46) in
_ position on the heat exchanger unit (7).
(b)
For the right heat exchanger unit (11HM4), 1 Put the seals (143) and (147) and the inlet plenum (46) in
_ position on the heat exchanger unit (7).
(5)
Install the screws (48), the washers (49) and the nuts (50).
(6)
Put the bonding strap (41) in position and install the screw (42), the washer (44) and the nut (45) (Ref. TASK 20-28-00-912-004).
(7)
Put the clamp (9) and the sleeve (8) in position on the heat exchanger unit (7).
(8) Tighten the clamp (9). Subtask 21-52-24-420-051
D. Installation of the Heat Exchanger Unit NOTE : Turn the sleeves when you move them or when you install them. This
____ will help to prevent damage to the seals in the sleeves.
NOTE : To make sure that the bolts (40) and (56) tighten correctly
____
additional washers (39) and (57) may be fitted.
NOTE : It is no longer required that the bonding strap (34) is fitted for
____
the installation of the heat exchanger unit.
(1) Install the heat exchanger unit WARNING : SUPPORT THE UNIT/ASSEMBLY OR IT WILL FALL AND BECOME
_______ DAMAGED OR INJURE PERSONNEL. THE UNIT/ASSEMBLY IS HEAVY.
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(a) Carefully put the heat exchanger unit (7) in position in the aircraft.
NOTE : The heat exchanger unit weighs aprx. 40 kg. (80 lb).
____
(b)
Install the bushing (38), (if required the washer (39)), the bolt (40), the washer (36) and the nut (35).
(c)
Put the support rods (80), (82) and (83) in position at the heat exchanger unit (7).
(d)
Install the bushings (58), (if required the washers (57)), the bolts (56), the washers (55) and the nuts (54).
(2)
Get access to the fan plenum outlet and with your fingers feel around the lip seal (11) to make sure that it is correctly installed.
(3)
Put the duct (15) in position and install the clamp (14).
(4)
TORQUE the clamp (14) to between 0.4 and 0.5 m.daN (35.39 and 44.24 lbf.in).
(5)
Move the sleeve (16) so that the "Z" dimensions are approximately equal.
(6)
Move the sleeve (3) in position on the heat exchanger unit (7) until you get the 4mm. Ref. dimension.
(7)
Put the clamp (2) in position and move it until you get the 4mm. Ref. dimension.
(8)
Tighten the clamp (2).
(9)
Do a check of the "X" and the "Y" dimensions at the sleeves (16) and (3).
(a)
For the "X" dimension,
-measure the maximum and the minimum "X" dimensions around the cicumference of the sleeve (16),
-the difference between the maximum and the minimum "X" dimensions must not be more than 1.7mm.
(b)
For the "Y" dimension,
-measure the maximum and the minimum "Y" dimensions around the circumference of the sleeve (3),
-the difference between the maximum and the minimum "Y" dimensions must not be more than 1.2mm.
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(c) You can get the tolerance of 1.7mm and 1.2mm if you adjust the support rod/s (1) and/or (83).
NOTE : Adjustment of the support rod (1) will give you a vertical
____ difference. Adjustment of the support rod (83) will give you a lateral difference. You must only adjust the support rods (1) and (83). Safety the support rod/s after you adjust them.
(10)
Put the sleeve (13) in position on the heat exchanger unit (7) and install the clamp (12).
(11)
TORQUE the clamp (12) to between 0.08 and 0.12 m.daN (7.07 and 10.61 lbf.in).
(12)
Put the bonding strap (41) in position and install the washer (32), the screw (31) and the nut (33) (Ref. TASK 20-28-00-912-004).
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