70-22-04 WOOD ELECTRIC: Amdt. 39-1096 as amended by Amendment 39-1207. Applies to Aircraft Incorporating Wood Electric Corp Model 105, 106, 107, 108, 147, 152, 254, 447, 448, or 2100 series circuit breakers.
Compliance required as indicated:
(a) Within the next 500 hours' time in service after the effective date of this AD, unless already accomplished within the last 250 hours' time in service, and thereafter at intervals not to exceed 750 hours' time in service from the last check; to detect jammed circuit breakers, manually open and close all Wood Electric Corp. Model 105, 106, 107, 108, 147, 152, 254, 447, 448, and 2100 series circuit breakers installed in aircraft. All circuit breakers found jammed must be replaced prior to further flight. This check is not required when the modification in Paragraph (b) has been accomplished.
(b) Within the next 1250 hours' time in service after the effective date of this AD, unless already accomplished, modify all Wood ElectricCorp. 105, 106, 107, 108, 147, 152, 254, 447, 448 and 2100 series circuit breakers by installing a ring manufactured in accordance with Wood Electric Corp. Drawing Number 64-008 Rev. No. 2 dated June 26, 1970 or later revision or equivalent approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region. To accomplish the modification, position the circuit breaker in either the closed or opened position and place the ring below the step (cap) portion of the button and above the threaded mounting neck of the circuit breaker. Exert enough finger pressure to snap the ring into place. Manually open and close the circuit breaker to insure proper positioning of the ring.
(c) Upon request with substantiation data submitted through an FAA maintenance inspector, the compliance time specified in this AD may be increased by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
(d) The check required by this AD may be performed by the pilot and the modification required by this AD constitutes preventive maintenance and may be performed by persons authorized to perform preventive maintenance under FAR 43.
(Wood Electric Corp. Drawing Number 99-001 Rev. 1 dated June 26, 1970; Boeing Model 707/720 Service Bulletin 2693 Rev. 3 dated July 1, 1970; Boeing Model 727 Service Bulletin 24-35 Rev. 3 dated July 1, 1970 and Boeing Model 737 Service Bulletin 24-1019 Rev. 3 dated July 20, 1970 pertain to the modification required by this AD.)
Amendment 39-1096 was effective November 4, 1970.
This Amendment 39-1207 is effective May 19, 1971.