76-19-01 BRITISH AIRCRAFT CORPORATION: Amendment 39-2723. Applies to Viscount Model 744, 745D, and 810 Series airplanes, certificated in all categories.
Compliance is required as indicated.
To prevent possible failure of the elevator spring servo tab control mechanism, accomplish the following:
(a) Replace the spigot bracket, P/N 70120-367, that attaches the elevator spring tab system bellcrank to the left elevator torque tube with a new bracket of the same part number as follows:
(1) If neither paragraph (b) or (c) of AD 71-4-2 has been complied with prior to the effective date of this AD, replace the bracket within the next 100 hours time in service after the effective date of this AD or prior to the accumulation of 12,000 hours total time in service on the bracket, whichever occurs later.
(2) If paragraph (b) or (c) of AD 71-4-2 has been complied with prior to the effective date of this AD, replace the bracket at the latest of the following:(i) Within the next 50 hours time in service after the effective date of this AD.
(ii) Within 1000 hours time in service after complying with AD 71-4-2 if the bracket was not replaced in complying with that AD.
(iii) Prior to the accumulation of 12,000 hours total time in service on the bracket.
(3) After complying with paragraph (a)(1) or (a)(2) of this AD, as appropriate, continue to replace the brackets prior to the accumulation of 12,000 hours total time in service after installation.
(b) Operators who have not kept records of total hours time in service on individual spigot brackets, P/N 70120-367, must substitute in lieu thereof the total hours time in service of the airplane.
This supersedes Amendment 39-1154 (36 FR 2562), AD 71-4-2.
This amendment becomes effective October 15, 1976.