Airworthiness Directive · Amendment 39-15599 · Eurocopter France Model AS 355 N Helicopters
Eurocopter France Model AS 355 N Helicopters
This AD applies to Model AS 355 N helicopters, certificated in any category.
We are adopting a new airworthiness directive (AD) for Eurocopter France Model AS 355 N helicopters. 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 European Aviation Safety Agency (EASA), the technical agent for France, with which we have a bilateral agreement, states in the MCAI: "This Airworthiness Directive (AD) is issued because it was found that the power drawn by the starter generators from the engines is above the consumption capacity at altitudes above 3,000 meters, declared for the engines of AS 355 N helicopters. Excessive power consumption of the starter generators reduces the engine surge margin, which can result in engine failure." After engine start, the starter generator functions as the normal operational electrical generator. We are issuing this AD to require actions that are intended to address this unsafe condition.
Within 100 hours time-in-service or within 12 months, whichever occurs first, unless already done, do the following actions:
(1) Install a limitation placard (indicating the new load limitation for the starter generator) on the overhead instrument panel, immediately below the ammeter.
(2) The placard must state the following: Maximum continuous load per generator 100A If Hp>10000 ft.
None.
Alternative Methods of Compliance (AMOCs): The Manager, Safety Management Group, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to ATTN: Ed Cuevas, Aviation Safety Engineer, Fort Worth, Texas 76193-0111, telephone (817) 222-5355, fax (817) 222-5961.
