Airworthiness directives › 2013-05-16
AD 2013-05-16 Airworthiness Directives; Hughes Helicopters, Inc., and McDonnell Douglas Helicopter Systems (Type Certificate Is Currently Held by MD Helicopters, Inc.) Helicopters
Applicability*9
This AD becomes effective April 30, 2013.
Compliance
(1) The Manager, Los Angeles Aircraft Certification Office, FAA, may approve AMOCs for this AD. Send your proposal to: John Cecil, Aerospace Engineer, FAA, Los Angeles Certification Office, Airframe Branch, 3960 Paramount Blvd., Lakewood, California 90712-4137, telephone (562) 627-5228, fax (562) 627-5210, email john.cecil@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.
Required actions
Joint Aircraft Service Component (JASC) Code 5302: Rotorcraft Tailboom.
Unsafe condition
(1) Within 6 months or 100 hours time-in-service, whichever occurs first, measure the distance from the aft face of the station 209.78 frame ring to the center of rivet No. 1 and rivet No. 2 at the four locations where the frame ring attaches to the tailboom longeron as depicted in Figure 2 of MD Helicopters Service Bulletin (SB) No. SB369D-207, SB369E-102, and SB369F-087, dated July 20, 2010. SB369D-207 applies to Model 369D helicopters; SB369E-102 applies to Model 369E helicopters; and SB369F-087 applies to Model 369F and FF helicopters. (2) If either the No. 1 or No. 2 aft rivet at a frame-ring-to-tailboom-longeron location is more than 0.50 inches (12.7 millimeters) from the aft face of the station 209.78 frame ring, before further flight, modify that location by fabricating and installing a doubler over the location as depicted in Figures 3 and 4 and by following the Accomplishment Instructions, paragraph 2.C., of the SB for your model helicopter.
Affected ADs
This AD defines the unsafe condition as too short an edge distance from an aft longeron rivet to the edge of a tailboom frame ring, which could result in failure of the tailboom and subsequent loss of control of the helicopter.
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