AD 2007-16-01 Airworthiness Directives; Enstrom Helicopter Corporation Model F-28, F-28A, F-28C, F-28C-2, F-28C-2R, F-28F, F-28F-R, 280, 280C, 280F, 280FX, TH-28, 480, and 480B Helicopters

Makes named: enstrom. Models named: F-28, F-28A, F-28C, F-28C-2, F-28C-2R, F-28F, F-28F-R, 280, 280C, 280F. Read the applicability below — it usually turns on serial or part numbers too.

Model F-28, F-28A, F-28C, F-28C-2, F-28C-2R, F-28F, F-28F-R, 280, 280C, 280F, 280FX, TH-28, 480, and 480B helicopters, with a main rotor blade retention pin (retention pin) having a serial number (S/N) that is listed in the following table, installed, certificated in any category: Retention Pin S/N   04098-01 through 04098-56. 05018-01 through 05018-36. 05143-01 through 05143-56. 05341-1 through 05341-8. 05341-10 through 05341-17. 05341-19. 05341-21 through 05341-33. 05341-35 through 05341-42. 05341-44 through 05341-59. 05341-61. 05341-62. 05341-64 through 05341-71. 06214-3 through 06214-14. 06214-16 through 06214-23. 06214-25 through 06214-29. 06214-31. 06214-33 through 06214-35. 06214-37 through 06214-57. 06214-59 through 06214-68.

Required as indicated, unless accomplished previously. To prevent failure of a retention pin, separation of a main rotor blade from the helicopter, and subsequent loss of control of the helicopter, accomplish the following: (a) Before further flight, check the S/N that is marked on the head of each retention pin to see if it is a S/N that is listed in the Applicability section of this AD. See Figure 1 for the location of the S/N. If there is no serial number marked on the head of the retention pin ( i.e. , the retention pin head is blank), the retention pin does not need to be replaced and this determination constitutes a terminating action for the requirements of this AD for that retention pin. ER31JY07.016 (b) The visual check required by paragraph (a) of this AD may be performed by an owner/operator (pilot) holding at least a private pilot certificate, and must be entered into the aircraft records showing compliance with paragraph (a) of this AD in accordance with 14 CFR sections 43.11 and 91.417(a)(2)(v). (c) Determine the number of hours TIS for any affected retention pin and replace the retention pin with an airworthy retention pin as follows: (1) For a retention pin with 545 or more hours TIS, remove the retention pin and replace it with an airworthy retention pin with a S/N that is not listed in the Applicability section of this AD within the next 5 hours TIS or within 30 days, whichever occurs first. (2) For a retention pin with less than 545 hours TIS, remove the retention pin and replace it with an airworthy retention pin with a S/N that is not listed in the Applicability section of this AD on or before reaching 550 hours TIS or within 30 days, whichever occurs first. Note: Enstrom Service Directive Bulletin No. T-029 and Enstrom Service Directive Bulletin 0102, both dated March 20, 2007, pertain to the subject of this AD. (d) Removing any affected retention pin and replacing it with an airworthy retention pin that is not included in the Applicability section of this AD is considered a terminating action for the requirements of this AD for that retention pin. (e) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Contact the Manager, Chicago Aircraft Certification Office, FAA, ATTN: Gregory J. Michalik, Senior Aerospace Engineer, 2300 E. Devon Ave., Room 107, Des Plaines, Illinois, 60018, telephone (847) 298-7135, fax (847) 294-7834, for information about previously approved alternative methods of compliance. (f) This amendment becomes effective on August 15, 2007. Issued in Fort Worth, Texas, on July 24, 2007. David A. Downey, Manager, Rotorcraft Directorate, Aircraft Certification Service. [FR Doc. 07-3711 Filed 7-30-07; 8:45 am] BILLING CODE 4910-13-P