AD NUMBER: 2007-21-07
MANUFACTURER: Airbus
SUBJECT: Airworthiness Directive 2007-21-07
SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above.

This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product.

The MCAI describes the unsafe condition as: An incident occurred on one A300-600 aircraft at parking brake application. Both engines were running, the aircraft started moving again despite parking brake application. Captain tried to stop the aircraft via the pedals but, as the parking brake selector valve was selected, the aircraft could not be stopped (as per design, activation of the parking brake inhibits the other braking modes, and consequently prevents the recovery of the normal braking through the pedals).

As part of the investigation, the pressure limiter was removedand examined. The expertise revealed a metallic wire aimed at reducing the section of one port of this equipment was found broken.

A part of this wire partially obstructed the hole receiving this wire, thus delaying the build up of parking brake pressure.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/