# AD 76-13-01: Lower Body Skin - Type: Airworthiness directive - Status: Current - Products: Boeing 727-100 Series, 727-100C Series, 727-200 Series, 727-200F Series, 727 Series and 727C Series - Effective: July 20, 1976 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Large airplane - Amendment: 39-2666 - Registered aircraft: 25 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E719CE90BC20E45E86256832005E3030.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/76-13-01 ## The airworthiness directive 76-13-01 BOEING: Amendment 39-2648 as amended by Amendment 39-2666. Applies to Boeing Model 727 series airplanes, categorized as Group I and II in Boeing Service Bulletin No. 727-53-128, Revision 2, or later FAA approved revisions, and certificated in all categories. Compliance required as indicated. To detect corrosion and/or cracking in the lower body skin (1) along BBL 0 from Body Stations 360 to 740 and along Stringers 28L and 28R from the forward end of the body fairing to Body Station 740 on Group I airplanes and (2) along Stringers 27L and 27R from the forward end of the body fairing to Body Station 740 on Group I and II airplanes, accomplish the following: A. Within the next six (6) months from the effective date of this AD, unless accomplished within the last eighteen (18) months, and thereafter at intervals not to exceed twenty-four (24) months, inspect in accordance with the external/internal visual inspection procedures of Figures 1 and 3 of Boeing Service Bulletin No. 727-53-128, Revision 2, or later FAA approved revisions, or equivalent procedures approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region; or, B. 1. Within eighteen (18) months from the effective date of this AD, unless accomplished within the last eighteen (18) months, and thereafter at intervals not to exceed thirty- six (36) months, inspect in accordance with the external/interval visual inspection procedures of Figures 1 and 3 of Boeing Service Bulletin No. 727-53-128, Revision 2, or later FAA approved revisions, or equivalent procedures approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region; and, 2. Within the next six (6) months after the effective date of this AD, and thereafter at intervals not to exceed six (6) months until an external/interval inspection is performed pursuant to paragraph B.1 above, inspect in accordance with the external visual inspection procedures of Figure 1 of Boeing Service Bulletin No.727-53-128, Revision 2, or later FAA approved revisions, or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region; and, 3. Within twenty-four (24) months after each external/ internal inspection conducted per paragraph B.1 above, and thereafter at intervals not to exceed six (6) months until the next external/internal inspection per paragraph B.1 is performed, inspect in accordance with the external visual inspection procedures of Figure 1 of Boeing Service Bulletin No. 727-53-128, Revision 2, or later FAA approved revisions, or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. C. If the inspections conducted per paragraphs A or B reveal corrosion and/or cracking, repair in accordance with Boeing Service Bulletin No. 727-53-128, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. D. Areas repaired in accordance with paragraph C, the Boeing 727 Structural Repair Manual, or Boeing Service Bulletin No. 727-53-73, or later FAA approved revisions, need not comply with the inspection requirements of this AD, provided faying surface sealant was applied to the faying surfaces. Areas in which corrosion and/or cracking is not found, must be reinspected per paragraph A or B until terminating action per paragraph F is accomplished. E. The left and right had ram air inlet doors and splitter vane need only be removed every other external inspection of paragraph B.2 and B.3. F. Modification in accordance with Part I - paragraph C or Part II - paragraph C, as applicable, of Boeing Service Bulletin No. 727-53-128, or later FAA approved revisions, or an installation approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, constitutes terminating action for the areas specified in the service bulletin. G. Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, may adjust the repetitive inspection intervals in this AD, if the request contains substantiating data to justify the increase for that operator. 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 39-2648 became effective July 2, 1976. This amendment 39-2666 becomes effective July 20, 1976. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A3WE](https://openairdocs.org/tcds/A3WE): The Boeing Company; names 6 of 6 models: 727-100 Series, 727 Series, 727-200 Series, 727-100C Series, 727-200F Series, 727C Series ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 25 (25 by airframe model, 0 by engine model) - Makers: Boeing 25 Models with the most aircraft: - [Boeing 727-223](https://openairdocs.org/model/boeing-727-223): 9 aircraft (airframe model) - [Boeing 727-227](https://openairdocs.org/model/boeing-727-227): 4 aircraft (airframe model) - [Boeing 727-225](https://openairdocs.org/model/boeing-727-225): 2 aircraft (airframe model) - [Boeing 727-200F](https://openairdocs.org/model/boeing-727-200f): 1 aircraft (airframe model) - [Boeing 727-200](https://openairdocs.org/model/boeing-727-200): 1 aircraft (airframe model) - [Boeing 727-212](https://openairdocs.org/model/boeing-727-212): 1 aircraft (airframe model) - [Boeing 727-230](https://openairdocs.org/model/boeing-727-230): 1 aircraft (airframe model) - [Boeing 727-232](https://openairdocs.org/model/boeing-727-232): 1 aircraft (airframe model) - [Boeing 727-243](https://openairdocs.org/model/boeing-727-243): 1 aircraft (airframe model) - [Boeing 727-247](https://openairdocs.org/model/boeing-727-247): 1 aircraft (airframe model) - [Boeing 727-264](https://openairdocs.org/model/boeing-727-264): 1 aircraft (airframe model) - [Boeing 727-281](https://openairdocs.org/model/boeing-727-281): 1 aircraft (airframe model) - [Boeing 727-277](https://openairdocs.org/model/boeing-727-277): 1 aircraft (airframe model) All 13 models: https://openairdocs.org/ad/76-13-01/models.md Every aircraft: https://openairdocs.org/ad/76-13-01/aircraft.md Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.