Document ID: chunk:federal_register_of_legislation:F2007L03531:body:0:p2
Version: federal_register_of_legislation:F2007L03531
Segment Type: other
Provision Reference: 
Character Range: 2926–6154

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 0096.

                      b) If corrosion is found that is severe enough to cause pitting, or if any moisture is visible on the inside of a push-pull rod, replace it with an airworthy push-pull rod.

                Note 1:  Determining continued serviceability of the push-pull rods by inspecting the exterior only of each push-pull rod is described in Enstrom Helicopter Corporation Service Information Letter No. 0156, dated 9 December 2003.

                   3. For Model TH-28, 480 and 480B 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. T-019, dated 10 September 2003 (SDB T-019).

                   Table 2
                Helicopter models                        Push-pull rod service life                                     Compliance times
                Model TH-28, 480, and 480B helicopters.  Push-pull rod that has been installed for 10 or more years.    Inspect within 50 hours TIS or at the next annual inspection, whichever occurs first.
                Model TH-28, 480, and 480B 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 T-019.

                     b) If corrosion is found that is severe enough to cause pitting, or if any moisture is visible on the inside of a push-pull rod, replace it with an airworthy push-pull rod.

                Note 2:  Determining continued serviceability of the push-pull rods by inspecting the exterior only of each push-pull rod is described in Enstrom Helicopter Corporation Service Information Letter No. T-019.

                Note 3:  FAA AD 2007-11-02 Amdt 39-15059 dated 5 July 2007 refers.

Compliance:     1. Within 10 hours time-in-service (TIS) or at the next annual inspection, whichever occurs first after the effective date of this AD.

                2. In accordance with the compliance times stated in Table 1 of this AD.

                  a) Before further flight, after the effective date of this AD.

                  b) Before further flight, after the effective date of this AD.

                3. In accordance with the compliance times stated in Table 2 of this AD.

                  a) Before further flight, after the effective date of this AD.

                  b) Before further flight, after the effective date of this AD.
             This Airworthiness Directive becomes effective on 2 October 2007.
Background:  This AD requires the