| AD Number | 61-11-04 | Status | Active |
| Effective Date | Not specified | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | N/A |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | Federal Register: May 20, 1961 | ||
| Manufacturer(s) | de Havilland Aircraft Co., Ltd., The |
| Model(s) | D.H. 104 Dove Series 1A D.H. 104 Dove Series 2A D.H. 104 Dove Series 5A D.H. 104 Dove Series 5BA D.H. 104 Dove Series 6A D.H. 104 Dove Series 6BA D.H. 104 Dove Series 7A D.H. 104 Dove Series 7AXC D.H. 104 Dove Series 8A D.H. 104 Dove Series 8AXC |
61-11-04 de HAVILLAND: Amdt. 290, Part 507, Federal Register May 20, 1961. Applies to de Havilland Series Airplanes Prior to Serial No. 04503.
Compliance required as indicated.
Due to reports of severe corrosion at the mainplane lower spar booms, the following inspections are required except that any inspection accomplished in accordance with AD 57-01- 01 may be utilized in establishing the less frequent inspection intervals permitted in this directive.
(a) Inspections shall be performed on the upper and lower spar booms from rib No. 1 to the wing tip as follows:
(1) Tank Bay Area, Ribs 1 to 5. Inspection required every six months, the first of such inspections to be made six months after the effective date of this directive or six months after the last inspection with a 10-power glass, whichever date is earlier. If no signs of corrosion are found after two successive inspections, inspect every twelve months thereafter.
(2) Wheel Well Area Ribs 5 to 7. Inspection required every month, the first such inspection to be made one month after the effective date of this directive or one month after the last inspection with a 10-power glass, whichever date is earlier. If no signs of corrosion are found after six successive monthly inspections, inspect every six months thereafter. "This inspection may be discontinued if no signs of corrosion are found after six months and surface protection is provided in accordance with de Havilland Dove Modification 852, or an FAA- approved equivalent."
(3) Rib 7 to Wing Tips. Visual inspection required every six months, the first such inspection to be made six months after the effective date of the directive or six months after the last inspection, whichever date is earlier. If no corrosion is found after a six-month period, inspect every twelve months thereafter.
(b) Any corrosion that is found must be thoroughly cleaned out prior to further flight. If the depth and width of the pocketare within the limits specified by the Hawker Siddeley Dove Maintenance and Repair Manual, Section 2, Chapter 6, Appendix A1, or an FAA-approved equivalent, the surfaces must be reprotected. If after cleaning out the corrosion pockets the limits specified by the Hawker Siddeley Dove Maintenance and Repair Manual, Section 2, Chapter 6, Appendix A1, or an FAA-approved equivalent are exceeded, the spar boom must be replaced prior to further flight. Hawker Siddeley Technical News Sheet CT (104) No. 125, Issue 6, dated June 26, 1967, and Hawker Siddeley Dove Maintenance and Repair Manual, Section 2, Chapter 6, Appendix A1, cover this subject.
This supersedes AD 57-01-01.
This directive effective May 20, 1961.
Revised October 13, 1961.
Revised December 1, 1967.