AD 62-19-04

62-19-04 ROLLS-ROYCE: Amdt. 480 Part 507 Federal Register September 1, 1962. Applies to All Tyne 512 and 515 Engines With Pre-modification 750 Flame Tubes Installed.

Compliance required as indicated.

Investigation of an inflight failure of flame tubes on a Rolls-Royce Tyne engine reveals the need for the following corrective action.

(a) Pre-modification 750 flame tubes shall be removed and replaced with new Pre-modification 750 or Modification 750 flame tubes as follows:

(1) On engines not incorporating a clutch mounted tail bearing (Rolls-Royce Modification 549):

(i) Pre-modification 750 flame tubes which have accumulated 325 or more hours' time service as of the effective date of this AD shall be replaced within the next 25 hours' time in service after the effective date of this AD.

(ii) Pre-modification 750 flame tubes which have accumulated less than 325 hours' time in service as of the effective date of this AD shall be replaced prior to theaccumulation of 350 hours' time in service.

(2) On engines incorporating a clutch mounted tail bearing (Rolls-Royce Modification 549):

(i) Pre-modification 750 flame tubes which have accumulated 450 or more hours' time in service as of the effective date of the AD shall be replaced within the next 50 hours' time in service after the effective date of this AD.

(ii) Pre-modification 750 flame tubes which have accumulated less than 450 hours' time in service as of the effective date of the AD shall be replaced prior to the accumulation of 500 hours' time in service.

(b) If new Pre-modification 750 flame tubes are installed in accordance with paragraph (a), such flame tubes must be replaced with Modification 750 flame tubes prior to the accumulation of 350 hours' time in service.

(Rolls-Royce Service Bulletin No. TY-72-375 concerns the same subject.)

This directive effective October 2, 1962.