Airworthiness Directive · Amendment 39-11733 · Eurocopter France Model AS350B, BA, B1, B2, B3, D, and AS355E, F, F1, F2, and N Helicopters
Eurocopter France Model AS350B, BA, B1, B2, B3, D, and AS355E, F, F1, F2, and N Helicopters
Model AS350B, BA, B1, B2, B3, D, and AS355E, F, F1, F2, and N helicopters, with Crouzet single-pole circuit breaker, part numbers (P/N) 84 400 028, and P/N 84 400 031 through P/N 84 400 036, installed as part of any optional installations, certificated in any category.
Note 1: This AD applies to each helicopter identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For helicopters that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (c) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) for Eurocopter France Model AS350B, BA, B1, B2, B3, D, and AS355E, F, F1, F2, and N helicopters that requires replacing certain circuit breakers. This amendment is prompted by the discovery of the loss of electrical continuity between the terminals of an installed circuit breaker. The actions specified by this AD are intended to prevent loss of electrical power to the emergency flotation gear or other optional installations and subsequent loss of the helicopter emergency flotation capability.
To prevent loss of electrical power to the emergency flotation gear or other optional installations and subsequent loss of the helicopter emergency flotation capability, accomplish the following:
(a) On or before 200 hours time-in-service or within the next 3 calendar months, whichever occurs first:
(1) For Model AS350B, BA, B1, B2, B3, and D helicopters, inspect and if inoperable, replace the Crouzet single-pole circuit breakers installed in the flotation gear unit assembly and other optional installations for electrical continuity in accordance with section 2.B. of the Accomplishment Instructions contained in Eurocopter France Service Bulletin (SB) No. 01.00.47, dated November 10, 1998, except disregard the compliance times stated in paragraph 2.B.2) of the SB.
(2) For Model AS355E, F, F1, F2, and N helicopters, inspect and if inoperable, replace the Crouzet single-pole circuit breakers installed in the flotation gear unit assembly and other optional installations for electrical continuity in accordance with section 2.B. of the Accomplishment Instructions contained in SB No. 01.00.44, dated November 10, 1998, except disregard the compliance times stated in paragraph 2.B.2) of the SB.
(b) On or before July 1, 2000, replace all Crouzet single-pole circuit breakers in accordance with section 2.B. of the Accomplishment Instructions of the applicable SB.
