AD/BELL 412/45 - Emergency Floatation Reservoir Adapter (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Bell Helicopter Textron 412 Series Helicopters AD/BELL 412/45 Emergency Floatation Reservoir Adapter 13/2005 TX

Applicability: Bell Helicopter Textron Model 412 and 412EP helicopters, modified with Aeronautical Accessories, Inc. (AAI), Supplemental Type Certificate (STC) SH2820SO; or with AAI Parts Manufacturer Approval (PMA) reservoir assembly, part number (P/N) 212-372-050; or with adapter, P/N 212-371-002, installed. Requirement: 1. Vent the nitrogen from the reservoir assembly by following the Accomplishment Instructions, Part II - Floatation System Discharging, of AAI Alert Service Bulletin (ASB) No. AA-05005, Revision A dated 27 June 27 2005 or later FAA Approved revision.

2. Remove the valve assembly and air line from the adapter, and inspect the counter bore depth (dimension D) as shown in Figure 1 of the ASB.

(a) If dimension D, as depicted in Figure 1 of the ASB, does not exceed .860 inch, recharge the floatation system by following the Accomplishment Instructions, Part III - Floatation System Charging, and referring to Figures 2 and 3 of the ASB.

(b) If dimension D, as depicted in Figure 1 of the ASB, exceeds .860 inch, replace the reservoir assembly and the adapter with serviceable parts.