64-19-03 DOUGLAS: Amdt. 784 Part 507 Federal Register August 7, 1964. Applies to Model DC-8 Series Aircraft. \n\n\tCompliance required as indicated. \n\n\tTo assure flap system reliability and to eliminate difficulties which could result in the inadvertent retraction of the flaps during critical portions of the flight regime, accomplish the following: \n\n\t(a) Modify each aircraft within 6,000 hours' time in service after the effective date of this AD to incorporate a flap lockout system per Douglas DC-8 Service Bulletin No. 27-132, Revision No. 2, dated December 12, 1963, or an FAA Western Region, Aircraft Engineering Division approved equivalent modification. When the flap system is modified as indicated, the hose inspection and replacement provisions of this AD may be discontinued. \n\n\t(b) Until the modification required by (a) is incorporated, inspect the flap system hoses and remove the hoses from service as follows: \n\n\t\t(1) Within 900 hours' hose time in service since the last inspection or 90 days after the effective date of this AD, whichever occurs first, inspect all flaps hoses bearing Douglas basic P/N 5716378-4 for any evidence of cracking, splitting, abrasion, or other damage to the covering. Reinspect at intervals of 900 hours hose time in service or 90 days, whichever occurs first, until the modification in (a) is accomplished. Remove from service any hose on which only the covering is found to be cracked or abraded and the hose itself is found to be undamaged prior to the next 300 hours hose time in service or 30 days, whichever occurs first. Remove from service any hose exhibiting damage other than cracked or abraded covering before further flight. Remove from service undamaged hoses bearing Douglas basic P/N 5716378-4 prior to 1,500 hours total hose time in service. The inspections and the removal from service requirements of this paragraph apply also to new hoses installed as replacements pursuant to this paragraph. \n\n\t\t(2) Priorto 1,800 hours total hose time in service, remove from service all hoses bearing Douglas basic P/N S5773937-4 (same length code) or Aeroquip basic P/N 611049-4 (same length code). \n\n\t\t(3) Remove from service all hoses bearing Douglas basic P/N S5776432-4 (same length code) or Aeroquip basic P/N's 677219-4, 677220-4 (same length code) as follows: \n\n\t\t(i) Remove from service hoses with less than 1,900 hours total hose time in service on the effective date of this AD prior to 2,000 hours total hose time in service. \n\n\t\t(ii) Remove from service hoses with 1,900 or more hours total hose time in service on the effective date of this AD within the next 100 hours hose time in service. \n\n\t\t(iii) Remove from service hoses installed as replacements under this paragraph prior to 2,000 hours hose time in service. \n\n\t\t(4) Remove from service all hoses bearing Douglas basic P/N S5778051 (same length code) or Resistoflex basic P/N's R23718-4, R23708-4 (same length code) as follows:(i) Remove from service hoses with less than 2,300 hours total hose time in service on the effective date of this AD prior to 2,400 hours total hose time in service. \n\n\t\t(ii) Remove from service hoses with 2,300 or more hours total hose time in service on the effective date of this AD within the next 100 hours hose time in service. \n\n\t\t(iii) Remove from service hoses installed as replacements under this paragraph prior to 2,000 hours hose time in service. \n\n\t\t(5) Prior to 2,000 hours total hose time in service, remove from service all hoses bearing Aeroquip basic P/N's 677233-4, 677235-4 (same length code) or Resistoflex basic P/N's R24717-4, R24718-4, R24719-4 (same length code). \n\n\t(c) Do not install green or black flap actuating cylinder hoses dated prior to 1962. \n\n\t(Douglas DC-8 Service Bulletins No. 27-113, Reissue No. 1 dated November 14, 1962, No. A27-146, Reissue No. 2, dated December 27, 1963, and No. 27-132, Revision No. 2 dated December 12, 1963, pertain tothis same subject.) \n\n\tThis supersedes AD 62-20-01. \n\n\tThis directive effective September 7, 1964. \n\n\tRevised October 13, 1964.