Airworthiness Directive 2003-05-11
one-timeAirworthiness Directives; Bell Helicopter Textron Canada Model 407 Helicopters
What this AD requires
This amendment supersedes an existing emergency airworthiness directive (EAD), which was sent previously to all known U.S. owners and operators of Bell Helicopter Textron Canada (Bell) helicopters by individual letters. That EAD requires a visual check to ensure that the two swashplate drive link cup washers (cup washers) are installed correctly. If a cup washer is installed incorrectly, removing and replacing the swashplate outer ring, each cup washer, bearing and liner, and drive link where the cup washer was installed incorrectly are also required. This amendment requires the same actions as the existing EAD, but clarifies that only the visual check may be performed by the owner/operator. This amendment is prompted by two reported failures of the stud portion of the swashplate drive link. The actions specified by this AD are intended to detect an incorrectly installed cup washer, which could limit the travel of the swashplate outer ring and lead to failure of the stud portion of the swashplate drive link, and subsequent loss of control of the helicopter.
Which aircraft AD 2003-05-11 applies to
Model identified via the Bell ASB 407-02-55 numbering convention; explicit 'Model 407' text not present in the extracted excerpt. Visually check swashplate drive link cup washer P/N 406-010-412-101 for correct installation; if incorrect, replace swashplate outer ring, cup washers, bearing/liner, and drive link per BHT ASB No. 407-02-55 dated 10/29/2002. Required before further flight.
Whether AD 2003-05-11 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.