Airworthiness Directive 99-24-05
one-timeAirworthiness Directives; Eurocopter Deutschland GMBH (ECD) Model BO-105CB-5 and BO-105-CBS-5 Helicopters
What this AD requires
This amendment supersedes an existing emergency priority letter airworthiness directive (AD), applicable to ECD Model BO-105CB-5 and BO-105-CBS-5 helicopters, that currently requires, before further flight, creating a component log card or equivalent record and determining the calendar age and number of flights on each tension- torsion (TT) strap. This amendment requires the same actions as the emergency priority letter AD and additionally clarifies the compliance time requirements specified in the emergency priority letter AD. This amendment is prompted by an accident in which a main rotor blade (blade) separated from an ECD Model MBB-BK 117 helicopter due to fatigue failure of a TT strap. The same part number TT strap is also used on the ECD Model BO-105 helicopter. The actions specified by this AD are intended to prevent failure of a TT strap, loss of a blade, and subsequent loss of control of the helicopter.
Which aircraft AD 99-24-05 applies to
Whether AD 99-24-05 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.