Document ID: chunk:federal_register_of_legislation:F2019L01376:body:0:p2
Version: federal_register_of_legislation:F2019L01376
Segment Type: other
Provision Reference: 
Character Range: 2799–5541

referenced as a source document for Figure 2.

             Note 3:  CASA may approve a radiographic inspection procedure designed by an  NDT Level 3 from ASTM Standards and recommended by the National Aerospace Non-Destructive Testing Board for accomplishing Requirement 2 for this AD. CASA Airworthiness Bulletin (AWB) 02‑060 Issue 01 "NDT Data - The Use of During the Course of Maintenance" guidance material refers.
             Note 4:  An alternate non-destructive inspection method, other than the radiographic inspection method detailed in the AD, can be used if approved by CASA in writing.
Background:  FAA AD 83-03-03 Amdt 39-4556 with an effective date of 14 March 1983 was issued to detect cracks and prevent possible failure of the tail boom and fin. The FAA had determined that tail boom skin cracks occurred in a model UH-1B which crashed. A metallurgical examination revealed cracks to be due to structural fatigue.
             Since this condition is likely to exist or develop on other helicopters of the same design, the FAA AD was issued. The AD requires visual and radiographic inspections for fretting and cracking, and repair or replacement, as necessary, of the tail boom skin and the fin spar cap on Bell Helicopter Textron Inc Model UH-1 series helicopters.
             CASA's predecessor conducted a review of FAA AD 83-03-03 Amdt 39-4556 on 9 March 1983. At the time of the review no Bell Helicopter Textron Inc UH-1 (All Variants) series helicopters were on the Australian civil aircraft register.
             It has since come to CASA's attention that Bell Helicopter Textron Inc UH-1 series helicopters have now been placed on the Australian civil aircraft register and will require inspections to be accomplished in accordance with FAA AD 83-03-03 Amdt 39-4556. Consequently, CASA issued AD/UH-1/20 to mandate the requirements of the FAA AD.
             Amendment 1 of this AD corrected a reference to FAA Advisory Circular 43-13B Change 1, which has been removed with the issue of Amendment 2.
             Amendment 2 of this AD clarifies the intent of the original FAA AD 83-03-03 to reflect contemporary circumstances. It inserts references to the associated FAA AD and NTSB Safety Recommendations as source documents for Figures 1 and 2 respectively. Amendment 2 of this AD also provides guidance for proposing and approving of a radiological or alternative inspection procedures. It also extends the previous compliance time from 14 days to 90 days to allow sufficient time for the development of appropriate CASA approved NDT procedures and industry capacity to conduct the inspection activities.

Figure 1.
Figure 2.
Pieter van Dijk
Delegate of the Civil Aviation Safety Authority
25 October 2019