AD 72-16-06

72-16-06 SIKORSKY: Amendment 39-1496. Applies to all S61A, S61L, S61N and S61R type helicopters.

Compliance required as indicated after the effective date of this Airworthiness Directive.

To assure the proper electrical feeder wiring gage in the A.C. circuit breaker panel, accomplish the following:

1. Within the next 25 hours time in service from the effective date of the Airworthiness Directive comply with Sikorsky Service Bulletin 61B55-27A, Paragraph 2A or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region.

2. Within 250 hours time in service from the effective date of this Airworthiness Directive.

(a) Conduct a conformity inspection in accordance with the aircraft drawing effectivity list shown in Sikorsky Service Bulletin 61B55-27A, Paragraph 2.B(5) or later revision approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region.

(b) Conduct an inspection of all alterations performed on, or affecting the A.C. circuit breaker panel and substantiate feeder wire sizes affected are adequate for the alterations performed. Changes required as a result of this Airworthiness Directive must be approved by the Chief, Engineering and Manufacturing Branch, FAA, New England Region. (Ref. Sikorsky S.B. 61B55-27A dated 9 May 1972 for list of Sikorsky Service Bulletins which modified drawings all listed in Paragraph 2.B(5)).

Upon request with substantiating data submitted through an FAA maintenance inspector, the Compliance times specified in this Airworthiness Directive may be increased by the Chief, Engineering and Manufacturing Branch, FAA, New England Region.

This amendment is effective 10 August 1972.