| AD Number | 68-21-06 | Status | Active |
| Effective Date | October 24, 1968 | Issue Date | Not specified |
| Docket Number | Unknown | Amendment | 39-671 |
| Product Type | ["Aircraft"] | Product Subtype | ["Rotorcraft"] |
| CFR Part | --- - Part 39 | CFR Section | N/A |
| Citation | This information is not available. | ||
| Manufacturer(s) | Sikorsky Aircraft Corporation |
| Model(s) | S-61A S-61L S-61N |
68-21-06 SIKORSKY: Amendment 39-671. Applies to S-61A, S-61L, S-61N Type Helicopters.
(a) Within the next ten hours time in service after the effective date of this Airworthiness Directive unless already accomplished, deactivate the automatic flight control system (AFCS) by disconnecting the power sources to the AFCS system and the channel monitor panel as follows:
(1) Pull circuit breakers for electric power to the channel monitor panel and the AFCS system and safety the circuitbreaker buttons in the tripped position.
(2) Disconnect electrical connectors at the aux. servos and secure to wire bundle. Electrically ground all three pins on each plug on the aux. servos.
(b) For Models S-61L and S-61N, the AFCS may be reactivated when Sikorsky Service Bulletin No. 61B55-10A, dated October 4, 1968, or later FAA approved revision, or equivalent alteration approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
(c) For Model S-61A, the AFCS maybe reactivated when an alteration approved by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region is incorporated.
This amendment is effective October 24, 1968, and supersedes the telegram dated September 17, 1968 on this subject.