Airworthiness Directive · Amendment 39-13747 · McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 Airplanes
McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 Airplanes
Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and MD-88 airplanes, as listed in Boeing Alert Service Bulletin MD80-25A381, dated August 5, 2002; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain McDonnell Douglas Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 airplanes, that requires replacement of certain freeze protection ribbon heaters in the lavatory water supply system, and flushing, cleaning, and sterilizing the potable water system; disconnecting, coiling, and stowing the wiring of the freeze protection ribbon heater; or removal of freeze protection heaters. This action is necessary to prevent failure of freeze protection ribbon heaters, which could result in the charring, scorching, smoking, and shorting out of freeze protection ribbon heaters in the lavatory water supply system. This condition, if not corrected, could also result in electrical arcing of freeze protection ribbon heaters, leading to fire and damage to water lines and components under the lavatory sink. This action is intended to address the identified unsafe condition.
To prevent failure of freeze protection ribbon heaters, which could result in the charring, scorching, smoking, and shorting out of freeze protection ribbon heaters in the lavatory water supply system and could also result in electrical arcing of freeze protection ribbon heaters, leading to fire and damage to water lines and components under the lavatory sink; accomplish the following:
(a) Within 18 months of the effective date of this AD, do the actions specified in paragraph (a)(1), (a)(2), or (a)(3) of this AD per the Accomplishment Instructions of Boeing Alert Service Bulletin MD80-25A381, dated August 5, 2002.
(1) Replace the existing freeze protection ribbon heater in the lavatory water supply system with a new, reidentified heater hose assembly. Flush, clean, and sterilize the potable water system; or
(2) Disconnect, coil, and stow the wiring of the freeze protection ribbon heater in the lavatory water supply system; or
(3) Remove the freeze protection ribbon heater from the lavatory water supply system.
Note 1: Boeing Alert Service Bulletin MD80-25A381 refers to Jamco Corporation Service Bulletin MD080-25-829, Revision 6, dated March 10, 2003, as an additional source of service information for instructions on replacing the existing freeze protection ribbon heater with a new, reidentified heater hose assembly for Model DC-9-81 (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83), DC-9-87 (MD-87), and Model MD-88 airplanes.
(b) Actions accomplished before the effective date of this AD per McDonnell Douglas MD-80 Service Bulletin 38-56, dated September 20, 1991, as revised by McDonnell Douglas MD-80 Service Bulletin Change Notification 38-56 CN1, dated June 11, 1992, are acceptable for compliance with the requirements of paragraph (a)(1) of this AD.
(c) In accordance with 14 CFR 39.19, the Manager, Los Angeles Aircraft Certification Office, FAA, is authorized to approve alternative methods of compliance (AMOCs) for this AD.
(d) Unless otherwise specified in this AD, the actions shall be done in accordance with Boeing Alert Service Bulletin MD80-25A381, dated August 5, 2002. 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 Boeing Commercial Airplanes, Long Beach Division, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Data and Service Management, Dept. C1-L5A (D800-0024). Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard, Lakewood, California; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
