| AD Number | 77-16-04 | Status | Active |
| Effective Date | August 31, 1977 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-2996 |
| Product Type | ["Aircraft"] | Product Subtype | ["Small Airplane"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| 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 |
77-16-04 HAWKER SIDDELEY AVIATION, LTD: Amendment 39-2996 applies to de Havilland Model DH-104 "Dove" airplanes, all series, certificated in all categories.
Compliance is required as indicated.
To prevent possible fatigue failure of the wing structure, accomplish the following:
(a) Irrespective of the incorporation of Hawker Siddeley Aviation, Ltd., (HSA) Modification 539, for wings which have not had HSA Modification 780 incorporated, within the next 25 hours time in service after the effective date of this AD or prior to accumulation of 3400 hours total time in service on the wing lower spar boom, whichever occurs later, at intervals not to exceed 3400 hours time in service, on the boom, replace it with a serviceable boom of the same part number or an FAA-approved equivalent.
(b) For wings which incorporate HSA Modification 780, replace the wing lower spar boom with a serviceable boom of the same part number or an FAA-approved equivalent -
(1) For Series1A, 2A, 5A, 5BA, 6A airplanes, prior to the accumulation of 20,000 hours total time in service on the wing lower spar boom including the time in service prior to incorporation of the modification; and
(2) For Series 7A and 8A airplanes, prior to the accumulation of 16,000 hours total time in service on the boom including the time in service prior to incorporation of the modification.
(c) For airplanes which do not incorporate HSA Modification 538 in the area of the fuselage center section, or have Modification 538 incorporated but not the associated HSA Modification 686, within the next 25 hours time in service after the effective date of this AD or prior to the accumulation of 1800 hours total time in service on the fuselage center section lower spar boom whichever occurs later, and thereafter, at intervals not to exceed 1800 hours time in service on the boom, replace the fuselage center section lower spar boom with a serviceable boom of the same part number or an FAA-approved equivalent.
(d) For airplanes which incorporate HSA Modification 538 in the area of the fuselage center section, provided the associated HSA Modification 686 has been incorporated within 3600 hours time in service on the fuselage center section lower spar boom since incorporating Modification 538, within the next 25 hours time in service on the boom after the effective date of this AD or prior to the accumulation of 6700 hours total time in service on the fuselage center section lower spar boom, including time in service prior to incorporation of the modification, whichever occurs later, and thereafter at intervals not to exceed 6700 hours time in service, replace the fuselage center section lower spar boom with a serviceable boom of the same part number or an FAA-approved equivalent.
NOTE: For airplanes which incorporate HSA Modification 779 in the area of the fuselage center section, no mandatory retirement time is imposed on the fuselage center section lower spar boom.
(e) Upon the request of an operator, the Chief, Aircraft Certification Staff, Europe, Africa, and Middle East region may adjust a replacement interval specified in paragraphs (a), (c), or (d) of this AD, if the request contains substantiating data to indicate that the average operating spectrum of the particular airplane is less severe than the operating spectrum upon which the specified replacement times are based and that the adjustment requested is justified. Forward request to FAA, Chief, Aircraft Certification Staff, c/o American Embassy, APO New York, N.Y. 09667.
NOTE: Appendix 1 of HSA Technical New Sheet (TNS) No. 119, Issue 10, dated July 19, 1971, contains information with respect to data needed to determine an average operating spectrum.
(f) Unless already accomplished, on airplanes converted to series 7AXC or 8AXC in accordance with HSA TNS No. 181, Issue 3, dated November 21, 1966, replace the wings prior to the accumulation of one fifth the total hourstime in service at conversion plus 16,000 hours time in service as determined in accordance with the instructions in paragraph 7 of HSA TNS No. 181, Issue 3, dated November 21, 1966, or an FAA-approved equivalent.
(g) Operators who have not kept records of time in service on any component to which a provision of this AD applies shall substitute airplane hours time in service in lieu thereof.
This amendment supersedes Amendment 289 to Part 507 of the Regulations of the Administrator (26 FR 4395), AD 61-11-03, as amended by Amendment 585 (28 FR 7394) and Amendment 662 (28 FR 14238).
This amendment becomes effective August 31, 1977.