Heat Exchangers
(a) Before installation, heat
exchangers should be inspected to ensure that no foreign matter has entered the
various connections, that there are no evident cracks or other damage and that
ram air passages are free from obstruction.
(b) Heat exchangers are heavy units and
they must therefore be adequately supported during installation to prevent them
fouling ducting, other system components and parts of the aircraft structure.
(c) The fore-and-aft and transverse
clearances for mounting flanges and bolts should be checked to ensure that they
are within the limits specified in the relevant Maintenance Manuals. Mounting
bolts should be tightened to the required torque values.
(d) New seals and 0-rings should be
fitted to the joints between system ducts, cooling air inlet and outlet
flanges, and charge-air connections. Nuts, bolts and clamps should not be over
tightened as connection flanges may distort and cause damage to adjacent brazed
joints. After installation the joints should be leak tested in accordance with
the procedure laid down in the relevant Aircraft Maintenance Manual.
(e) If disturbed during installation of
a heat exchanger, cooling air shutters or flaps should be tested and adjusted
as necessary. Movable parts should operate freely, and the limit switches of
electrical actuators should isolate the power supply when the shutter or flap
has moved through its full travel.
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