AD/WHE/4 Amdt 4 - Inflation of Tyres with an Inert Gas (Cth)

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

Wheels and Tyres

AD/WHE/4 Amdt 4

Inflation of Tyres with an Inert Gas 9/98

Applicability: All aircraft over 5700 kg MTOW and all those below 5700 kg MTOW fitted with tyres with a rating in excess of 266 km per hour (160 mph), except those tyres installed on aircraft with fixed non-retracting undercarriages.

Requirement: To ensure that all tyres fitted to braked wheels do not contain more than 5% of oxygen by volume, accomplish paragraph 1 or 2 below. Either of these procedures is acceptable, or they may be used together:

1. Install a placard, either in each wheel well or on or near each landing gear strut incorporating braked wheels, and in a location so as to be easily seen by a person performing routine tyre servicing. The placard shall state

" INFLATE TYRES WITH NITROGEN ONLY"; or,

2. Incorporate into the aircraft maintenance program, procedures that include the following items:

1. On braked wheels, install only tyres that have been inflated with dry nitrogen or other gases shown to be inert such that the gas mixture does not exceed 5% oxygen by volume.

b. Tyres on braked wheels may be serviced with air at remote locations where dry nitrogen is not available, provided that:

1. the oxygen content does not exceed 5% by volume; or,

ii. within the next 15 hours time in service, the tyre must be purged of air and inflated with dry nitrogen so that the oxygen does not exceed 5% by volume.

Note: FAA AD 87-08-09 Amdt 39-5613 refers.

Compliance: This amendment becomes effective on 13 August 1998. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES