62-14-06 VICKERS: Amdt. 457 Part 507 Federal Register June 23, 1962. Applies to Viscount Models 744, 745D, and 810 Series Airplanes.
Compliance required as indicated.
Because of failures of the main landing gear retraction jack fork ends, the following is required.
(a) Fork ends Part Numbers 70150-273, 74450-95, and 74450-411.
(1) Fork ends which have not been reworked in accordance with (e) and have accumulated 3,500 or more landings as of the effective date of this AD shall be inspected in accordance with (d):
(i) Within the next 50 landings if no inspection has been conducted subsequent to the accumulation of 3,500 landings and thereafter within each 800 landings.
(ii) Within the next 50 landings if 750 or more landings have been made since the last inspection conducted subsequent to the accumulation of 3,500 landings and thereafter within each 800 landings.
(iii) Prior to the accumulation of 800 landings if less than 750 landingshave been made since the last inspection conducted subsequent to the accumulation of 3,500 landings and thereafter within each 800 landings.
(2) Fork ends which have not been reworked in accordance with (e) and have accumulated between 3,450 and 3,500 landings as of the effective date of this AD shall be inspected in accordance with (d) within the next 50 landings and thereafter within each 800 landings.
(3) Fork ends which have not been reworked in accordance with (e) and have accumulated less than 3,450 landings as of the effective date of this AD shall be inspected in accordance (d) prior to the accumulation of 3,500 landings and thereafter within each 800 landings.
(b) Fork ends Part Numbers 72450-315 and 74450-499.
(1) Fork ends which have not been reworked in accordance with (e) and have accumulated 5,750 or more landings as of the effective date of this AD shall be inspected in accordance with (d) within the next 50 landings and thereafter within each800 landings.
(2) Fork ends which have not been reworked in accordance with (e) and have accumulated less than 5,750 landings as of the effective date of this AD shall be inspected in accordance with (d) prior to the accumulation of 5,800 landings and thereafter within each 800 landings.
(3) If two successive 800 landing inspections are accomplished without evidence of cracks, subsequent inspections may be made at intervals not exceeding 1,600 landings.
(c) All fork ends which have been reworked in accordance with (e) shall be inspected in accordance with (d) within each 800 landings after rework, except that reworked fork ends which have accumulated more than 750 landings, as of the effective date of this AD shall be inspected in accordance with (d) within the next 50 landings and each 800 landings thereafter. If two successive 800 landing inspections are accomplished without evidence of cracks, subsequent inspections may be made at intervals not exceeding 1,600landings.
(d) Remove and inspect using magnetic particle inspection or FAA-approved equivalent in accordance with British Aircraft Corporation (B.A.C.) Ltd. Preliminary Technical Leaflet (PTL) No. 171 Issue 6 (for 744 and 745D) or later ARB-approved issue; or PTL 31 Issue 6 (for 810) or later ARB-approved issue. Parts showing evidence of cracks shall be replaced or reworked in accordance with paragraph (e) before further flight.
(e) Parts showing evidence of cracks may be reworked once in accordance with British Aircraft Corporation (B.A.C.) Ltd. Preliminary Technical Leaflet (PTL) No. 171 Issue 6 (for 744 and 745D) or later ARB-approved issue; or PTL 31 Issue 6 (for 810) or later ARB- approved issue. Any parts showing evidence of cracks after reworking must be rejected.
(f) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Aircraft Certification Staff, FAA Europe, Africa, Middle East Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for that operator.
(g) For the purpose of complying with this AD, subject to acceptance by the assigned FAA maintenance inspector, the number of landings may be determined by dividing each airplane's hours' time in service by the operator's fleet average time from takeoff to landing for the airplane type.
This supersedes AD 60-11-11.
This directive effective July 24, 1962.
Revised March 17, 1966.