Page 36

TCH.1C-27J-2-29JG

1-2.1

TUBES (Cont'd)

1.Corrosion resistant steel tubing is used throughout the

aircraft for delivery lines, while light alloy tubing is
used for return and pump suction lines. In particular
areas such as the engine nacelle and the landing gear
compartments, both delivery and return pipings are
made of steel. The steel tubing is manufactured in
21-6-9 (SAE AMS 5561F) corrosion resistant steel
while the light alloy tubing is manufactured in AL
6061-T6 alloy. In order to apply the correct torque to
hydraulic tube fittings, it is necessary to identify the
type of tubing concerned (see Table 1-1).

Due to the high operating pressures and broad
temperature range to which the hydraulic system is
subjected, the following limitations must be adhered
to:

A.All pipes are connected by Permaswage, Harrison,

MS type fittings and quick disconnect couplings.
Furthemore they can be repaired by means of
Permaswage method.

B.All lines must be performed according to the

specifications and in accordance with T.O. 1-1A-8.
Steel tubing should not be formed manually except
in emergency situations. Refer to
AER(EP).1C-27J-4 for parts replacements.

C.Assembly and disassembly of tubes, fittings, and

components is critical. Sequences outlined in this
manual must be observed to prevent distortion and
subsequent leakage.

1-2.2

HOSES

(Cont'd)

1-6