1AD/ELECT/11 - Leach Relays - Control Terminal Insulation

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Electrical Equipment

AD/ELECT/11 Leach Relays - Control Terminal Insulation NK

Applicability: All Leach type 5038, 5039, 5058, 5059, 5060, 5061 relays.

Requirement: Modify relays by increasing the insulation between the coil terminals and both the main contactor bar and the earthed metal yoke of the coil.

An approved method of compliance is as follows:

Remove the two coil terminal screw assemblies.

2. Form a piece of 3 in. x 3 in. fibrous insulating sheet of 0.015 inch minimum thickness into a hat section so that the hollow portion can fit over the existing insulated terminal strip, with the remaining portions bearing against the moulded cover and the metal yoke respectively, so as to provide an equal overhang of insulation at each end of the terminal strip. Cut a suitable hole to permit the passage of the coil end wires through the new insulation and cut appropriate holes in the hat section to correspond with the existing holes in the terminal strip. Varnish the formed strip.

3. Place the completed hat section in position and pass the coil wires through the appropriate hole. Replace the coil terminal assemblies at the same time connecting up the coil wires and clamping the new insulation firmly in place on each side of the terminal strip; or

ANO 107.2.6.2.1.

Compliance: Before installation in an aircraft.