# AD 93-13-07: Install Water Drain System - Type: Airworthiness directive - Status: Historical - Products: McDonnell Douglas DC-9-11, DC-9-12, DC-9-13, DC-9-14, DC-9-15, DC-9-15F, DC-9-21, DC-9-31, DC-9-32, DC-9-32 (VC-9C), DC-9-32F, DC-9-32F (C-9A) and 8 more - Effective: August 18, 1993 - Superseded by: [AD 2006-06-04](https://openairdocs.org/ad/2006-06-04) - Product type: Aircraft, Large airplane - Amendment: 39-8620 - Docket: 92-NM-246-AD - Registered aircraft: 35 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F03D83F62B993E3F86256A080065EE83.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/93-13-07 ## The airworthiness directive 93-13-07 MCDONNELL DOUGLAS: Amendment 39-8620. Docket 92-NM-246-AD. Applicability: Model DC-9-10, -20, -30, -40, and -50 series airplanes, Model DC-9-81 and -82 series airplanes, and Model C-9 (Military) airplanes; as listed in McDonnell Douglas DC-9 Service Bulletin 53-179, dated January 18, 1985, as amended by Service Bulletin Change Notification 53-179 CN1, dated February 28, 1985, and Service Bulletin Change Notification 53-179 CN2, dated May 30, 1985; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent freezing of water on the control cables, which could restrict the movement of the cables and result in reduced controllability of the airplane, accomplish the following: (a) Within 24 months after the effective date of this AD, install a water drain system in the slant pressure panel in accordance with McDonnell Douglas DC-9 Service Bulletin 53-179, dated January 18, 1985, as amended by Service BulletinChange Notification 53-179 CN1, dated February 28, 1985, and Service Bulletin Change Notification 53-179 CN2, dated May 30, 1985. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. (c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (d) The installation shall be done in accordance with McDonnell Douglas DC-9 Service Bulletin 53-179, dated January 18, 1985; and Service Bulletin Change Notification 53-179 CN1, dated February 28, 1985, and Service Bulletin Change Notification 53-179 CN2, dated May 30, 1985, for McDonnell Douglas DC-9 Service Bulletin 53-179, dated January 18, 1985. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from McDonnell Douglas Corporation, P.O. Box 1771, Long Beach, California 90801-1771, Attention: Business Unit Manager, Technical Publications - Technical Administrative Support, C1-L5B. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Transport Airplane Directorate, Los Angeles Aircraft Certification Office (ACO), 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effectiveon August 18, 1993. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A6WE](https://openairdocs.org/tcds/A6WE): The Boeing Company; names 17 of 25 models: DC-9-12, DC-9-15F, DC-9-41, DC-9-13, DC-9-34F, DC-9-81 (MD-81), DC-9-33F, DC-9-11… ## 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: 35 (35 by airframe model, 0 by engine model) - Makers: Mcdonnell Douglas 30, Douglas 5 Models with the most aircraft: - [Mcdonnell Douglas DC-9-82(MD-82)](https://openairdocs.org/model/mcdonnell-douglas-dc-9-82-md-82): 22 aircraft (airframe model) - [Mcdonnell Douglas DC-9-15F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-15f): 3 aircraft (airframe model) - [Mcdonnell Douglas DC-9-33F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-33f): 3 aircraft (airframe model) - [Douglas DC9-15](https://openairdocs.org/model/douglas-dc9-15): 1 aircraft (airframe model) - [Douglas DC-9-15F](https://openairdocs.org/model/douglas-dc-9-15f): 1 aircraft (airframe model) - [Douglas DC-9-21](https://openairdocs.org/model/douglas-dc-9-21): 1 aircraft (airframe model) - [Douglas DC-9-32F](https://openairdocs.org/model/douglas-dc-9-32f): 1 aircraft (airframe model) - [Mcdonnell Douglas DC-9-32](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32): 1 aircraft (airframe model) - [Mcdonnell Douglas DC-9-32F](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32f): 1 aircraft (airframe model) - [Douglas DC-9-33F](https://openairdocs.org/model/douglas-dc-9-33f): 1 aircraft (airframe model) All 10 models: https://openairdocs.org/ad/93-13-07/models.md Every aircraft: https://openairdocs.org/ad/93-13-07/aircraft.md ## Related documents - [AD 2006-06-04](https://openairdocs.org/ad/2006-06-04): Main landing gear (MLG) · Boeing DC-9-11, DC-9-12, DC-9-13 and 17 more. Effective Apr 20, 2006. Supersedes this AD 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.