AD 74-21-03

74-21-03 BOEING: Amendment 39-1986 as amended by Amendment 39-2376. Applies to all Boeing models 707/720/727/737/747 series airplanes, certificated in all categories. Compliance required as indicated unless already accomplished. To reduce potential fire hazard, existing in lavatory waste containers accomplish the following:

A. Within 300 hours time in service from the effective date of this AD, unless already accomplished within the last 1,000 hours, visually inspect all electrical appurtenances, including wiring, terminal boxes, switches, and hot water heaters, physically located within lavatory waste container areas, for wear, abrasion and corrosion. Remove and replace as necessary. B. By December 31, 1975, unless already completed, accomplish lavatory rework in accordance with the following Boeing Service Bulletins, as applicable, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region:

ModelService Bulletin Number 727 727-25-211 747 747-25-2245

C. By June 30, 1976, unless already accomplished, accomplish lavatory rework in accordance with the following Boeing Service Bulletins, as applicable, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region:

Model Service Bulletin Number 707/720 1270, 1363, 1365, 3146 737 737-25-1096 or 737-25-1108

The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P. O. Box 3707, Seattle, Washington 98124. The documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington.

Amendment 39-1986 became effective November 15, 1974.

This amendment 39-2376 becomes effective November 10, 1975.