1AD/B747/170 - Main Entry Door Girt Bar Support Fitting

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Boeing 747 Series Aeroplanes

AD/B747/170 Main Entry Door Girt Bar Support Fitting 3/97

Applicability: Model 747 series with line numbers 1 through 868, excluding freighters and special freighters.

Requirement: Inspect in accordance with FAA AD 96-23-05 Amdt 39-9810.

Note: Boeing Service Bulletin 747-53A2378 Revision 1 refers.

Compliance: As specified in the Requirement Document with an effective date of 27 February 1997.

Background: The FAA received reports of corrosion on the floor structure supports for the escape slides of the main deck entry doors. The corrosion was found during scheduled deployment tests of the main entry door escape slides. Uncontrolled corrosion could result in separation of the escape slide from the lower door sill during deployment, and subsequently prevent proper operation during an emergency.