Airworthiness Directive · Amendment 39-18829 · Wings
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model DC-6, DC-6A, DC-6B, C-118A, R6D-1, and R6D-1Z airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model DC-6, DC-6A, C-118A, R6D-1, DC-6B, and R6D-1Z airplanes. This AD was prompted by a report of a fuel leak in a Model C-118A airplane that resulted from a crack in the wing lower skin. This AD requires repetitive radiographic, electromagnetic testing high frequency (ETHF), and electromagnetic testing low frequency (ETLF) inspections for cracking of the wing lower skin, and repairs if necessary. We are issuing this AD to address the unsafe condition on these products.
Except as specified in paragraph (i) of this AD: At the applicable time specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin DC6-57A001, dated April 28, 2016, do radiographic, electromagnetic testing high frequency (ETHF), and electromagnetic testing low frequency (ETLF) inspections for cracking of the wing lower skin at station 175, in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin DC6-57A001, dated April 28, 2016. Repeat the radiographic, ETHF, and ETLF inspections of any unrepaired areas thereafter at the applicable intervals specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin DC6-57A001, dated April 28, 2016.
If any cracking is found during any inspection required by this AD: Before further flight, repair the cracking using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
Where paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin DC6-57A001, dated April 28, 2016, specifies a compliance time “after the original issue date of this service bulletin,” this AD requires compliance within the specified compliance time after the effective date of this AD.
