The Federal Aviation Administration (FAA) has issued Airworthiness Directive AD2013-13-09 in regards to the Learjet 60 Brake System. This AD requires three separate Service Bulletins (SB) be accomplished within 12 months or 600 hours from August 6, 2013, the effective date of the AD.
This AD is to prevent failure of the braking system or adverse operation of the spoiler and thrust reverser system due to external damage. Following are the required SBs:
Installation of rigid hydraulic tube assemblies and improved MLG squat switch bracket.
Installation of metal shields and brackets for the wiring and tubes on the lower struts.
Improved wheel speed detect box and TR interface box.
The summary and complete AD can be viewed at the following:
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