AD 2018-05-01 Airworthiness Directives; Airbus Helicopters

This AD becomes effective April 5, 2018.

(1) The Manager, Safety Management Section, Rotorcraft Standards Branch, FAA, may approve AMOCs for this AD. Send your proposal to: David Hatfield, Aviation Safety Engineer, Safety Management Section, Rotorcraft Standards Branch, FAA, 10101 Hillwood Pkwy, Fort Worth, TX 76177; telephone (817) 222-5116; email 9-ASW-FTW-AMOC-Requests@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC.

The subject of this AD is addressed in European Aviation Safety Agency (EASA) AD No. 2015-0156, dated July 29, 2015, and corrected July 30, 2015. You may view the EASA AD on the internet at http://www.regulations.gov in Docket No. FAA-2016-5019.

Within 30 days: (1) Visually inspect the left-hand and right-hand sliding doors for sealing compound as shown in Figure 1 of Airbus Helicopters Alert Service Bulletin No. AS332-53.01.86, Revision 1, dated June 29, 2015 (ASB AS332-53.01.86), or Airbus Helicopters Alert Service Bulletin No. EC225-53A048, Revision 0, dated August 18, 2014 (ASB EC225-53A048), as applicable for your model helicopter. Remove any sealing compound. (2) Inspect all visible bracket surfaces for corrosion. If there is any corrosion, remove the corrosion and measure the corrosion depth. (i) If the measured corrosion depth is less than 0.5 mm, perform a jettisoning test. If the door passes the test, apply corrosion protectant. If the door does not pass the test, replace the jettisoning system before further flight. (ii) If the measured corrosion depth is 0.5 mm or more, perform a jettisoning test. If the door passes the test, apply corrosion protectant, perform a jettisoning test at intervals not to exceed two months for not more than six months, and replace the jettisoning system within six months. If the door does not pass the test, replace the jettisoning system before further flight. (3) Measure the clearance between the bracket and stainless steel pipe. If the clearance is less than 3 mm, remove the lockwire from the union and loosen the unions of the air vent pipe. Position the support and the air vent pipe to ensure a minimum clearance of 3 mm. Tighten the support and unions of the pipe and safety the union using lockwire. (4) For Model EC225LP helicopters and Model AS332-series helicopters with modification AL25612, inspect for drain obstruction by compressing the middle rail roller well piston and injecting distilled water through the roller well to determine if the water drains. If the drain is obstructed, remove the sealing compound and adhesive from the gutter in the bracket area. Remove the drain from the gutter and unclog the drain and gutter using a spatula or brush. Clean the gutter on the bracket side and the drain. Apply adhesive to the gutter and then slide in the drain. Allow the adhesive to dry, and then apply sealing compound.

This AD defines the unsafe condition as corrosion of a jettisoning mechanism which, if not detected and corrected, could result in failure of a sliding door to jettison, preventing occupants from exiting the helicopter during an emergency.