Document ID: chunk:federal_register_of_legislation:F2007L03531:body:0:p1
Version: federal_register_of_legislation:F2007L03531
Segment Type: other
Provision Reference: 
Character Range: 0–3208

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.

Enstrom F-28 Series Helicopters
AD/ENST 28/40  Main Rotor Push Pull Rod  11/2007 DM

Applicability:  Enstrom Helicopter Company Model F-28A, F-28C, and F-28F helicopters, excluding serial number (S/N) 816 and subsequent; Model 280, 280C, 280F, and 280FX helicopters, excluding S/N 2100 and subsequent; and Model TH-28, 480, and 480B helicopters, excluding S/N 5058 and subsequent.
Requirement:       1. Review the helicopter maintenance records and determine the date that each push-pull rod, part number (P/N) 28-16253 - all dash numbers (for Model F-28A, F- 28C, F-28F, 280, 280C, 280F, and 280FX helicopters) and P/N 4140532 - all dash numbers (for Model TH-28, 480, and 480B helicopters), was installed. If the date cannot be determined from the maintenance records, use the ``Date MFD'', which is located on the helicopter data plate, as the installation date for the push- pull rod.

                   2. For Model F-28A, F-28C, F-28F, 280, 280C, 280F, and 280FX helicopters, visually inspect the exterior and interior of each of the three push-pull rods for corrosion severe enough to cause pitting or any moisture, paying special attention to the area of the lower fitting, in accordance with section 5.1., INSPECTION, in Enstrom Helicopter Corporation Service Directive Bulletin No. 0096, dated 10 September 2003 (SDB 0096).

                   Table 1
                Helicopter models                                                   Push-pull rod service life                                                           Compliance times
                Model F-28A, F-28C, F-28F, 280, 280C, 280F, and 280FX helicopters.  Push-pull rod that has been installed for 20 or more years.                          Inspect within 10 hours time-in-service (TIS) or at next annual inspection, whichever occurs first.
                Model F-28A, F-28C, F-28F, 280, 280C, 280F, and 280FX helicopters.  Push-pull rod that has been installed for 10 or more years, but less than 20 years.  Inspect within 50 hours TIS or at the next annual inspection, whichever occurs first.
                Model F-28A, F-28C, F-28F, 280, 280C, 280F, and 280FX helicopters.  Push-pull rod that has been installed for less than 10 years.                        Inspect before the service life of the push-pull rod reaches 10 years since initial installation.

                      a) If corrosion without pitting is found on a push-pull rod, then repair, reassemble, remark, and reinstall it in accordance with section 5.2., REPAIR/REASSEMBLY, in SDB