| AD Number | 68-09-02 | Status | Active |
| Effective Date | November 19, 1968 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-593 |
| Product Type | ["Aircraft"] | Product Subtype | ["Large Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Lockheed Martin Corporation |
| Model(s) | 1329-23A 1329-23D 1329-23E |
68-09-02 LOCKHEED: Amdt. 39-593. Applies to Model 1329 airplanes, serial numbers 5001 through 5029 and 5031 through 5055.
Compliance required as indicated.
Lockheed Model 1329 and military C-140 series airplanes have experienced a number of stress corrosion cracks in the wing skin risers at the riser-skin intersection. To detect cracking of risers on these airplanes, accomplish the following:
(a) Within 15 days after the effective date of this AD, inspect all aircraft in accordance with the instructions contained in Lockheed-Georgia Company Service Bulletin No. 329-257, dated April 11, 1968, and Service Bulletin Supplement No. 329-257A, dated April 26, 1968, or later FAA approved revision, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
NOTE. - Aircraft which have been inspected by representatives of Lockheed-Georgia Company are considered to comply with paragraph (a) above.
(b) If cracks are detectedin the riser-skin intersections, reinspect at intervals not to exceed 180 days in accordance with the instructions contained in Lockheed-Georgia Company Service Bulletin No. 329-257, dated April 11, 1968, and Service Bulletin Supplement No. 329- 257A dated April 26, 1968, or later FAA approved revision, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
(c) If, as a result of the initial inspection or any subsequent inspections, it is determined that more frequent inspections are required, individual airplane owners will be so notified by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
(d) If no cracks are found, or if cracks are repaired in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region, the repetitive inspections required by paragraphs (b) and (c), above, may be discontinued.
(e) Repeat the inspection required by paragraph (a), above, at each annual inspection, or each twelve months. These inspections need only consist of Phase I and Phase II inspections as explained in Lockheed-Georgia Company Service Bulletin No. 329-257, dated April 11, 1968, and Service Bulletin Supplement No. 329-257A dated April 26, 1968, or later FAA approved revision, or in an equivalent manner approved by the Chief, Engineering and Manufacturing Branch, FAA, Southern Region.
This amendment becomes effective May 7, 1968.
Revised Nov. 19, 1968.