AD 67-27-06

67-27-06 ROLLS-ROYCE: Amdt. 39-488 Part 39 Federal Register October 3, 1967. Applies to Dart Model 542-4 and 542-10 engines.

Compliance required as indicated, unless already accomplished.

To prevent failure of fuel and oil hoses, accomplish the following:

(a) For fuel hoses, P/N's RU.21448, RK.38339A, RK.29902, RK.38340A, RU.21447, RK.29900A, RK.38361, RU.21455A, RK.29901A, and oil pressure indicator hose P/N RU.21440A, with 700 or more hours total time in service on the effective date of this AD, within the next 100 hours' time in service after the effective date of this AD and thereafter at intervals not to exceed 150 hours' time in service from the last inspection, inspect for cracks and crazing in accordance with Rolls-Royce Alert Service Bulletin Da 73-A49 or later ARB- approved issue, or an FAA-approved equivalent.

(b) For fuel hoses, P/N's RU.21448, RK.38339A, RK.29902, RK.38340A, RU.21447, RK.29900A, RK.38361, RU.21455A, RK.29901A, and oil pressure indicator hose P/N RU.21440A, with less than 700 hours' time in service on the effective date of this AD, before the accumulation of 800 hours' time in service and thereafter at intervals not to exceed 150 hours' time in service from the last inspection, inspect for cracks and crazing in accordance with Rolls-Royce Alert Service Bulletin Da 73-A49 or later ARB-approved issue, or an FAA-approved equivalent.

(c) If cracking or crazing of the hose is detected during the inspections required by (a) and (b), before further flight, replace with a new assembly.

(d) The repetitive inspections required under (a) or (b) for the fuel hoses may be discontinued following the incorporation of ARB-approved Rolls-Royce Modification 1467, or an FAA-approved equivalent.

(e) The repetitive inspections required under (a) or (b) for the oil pressure indictor hoses may be discontinued following the incorporation of ARB-approved Rolls-Royce Modification 1453, or an FAA-approved equivalent.

Thisamendment effective October 3, 1967.