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housekeeping philosophy. In other words, care should be taken to protect wire bundles and
connectors during work, and to ensure that all shavings, debris and contamination are cleaned up
after work is completed. This philosophy is a proactive approach to EWIS health. Wiring needs
to be given special attention when maintenance is being performed on it, or around it. This is
especially true when performing structural repairs, work under STCs or modifications.
To fully achieve the objectives of this TP it is imperative that all personnel performing
maintenance on or around EWIS receive appropriate training. In addition to technical content
regarding maintenance and inspection of EWISs, the training should also include sections on
good maintenance practices, including the “protect, clean as you go” housekeeping philosophy.
Advisory Circular AC-120-YY Aircraft Wiring Systems Training Program contains guidance
on recommended content and lesson plans for this training.
3. APPLICABILITY
a. The guidance provided in this document is directed to air carriers, air operators, type
certificate holders, STC holders, maintenance providers, repair stations and persons
performing modifications or repairs.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 3
b. The guidance provided in this TP document can be applied to all aircraft maintenance or
Inspection programs. The Enhanced Zonal Analysis Procedure in Appendix A of this
TP is specifically directed towards enhancing the maintenance programs for aircraft
whose current program does not include tasks derived from a process that specifically
considers wiring in all zones as the potential source of ignition of a fire.
c. This TP is not mandatory and does not constitute a regulation. This TP describes
acceptable means, but not the only means, of developing; implementing and evaluating
enhanced aircraft EWIS maintenance and inspection methods, practices and techniques.
4. RELATED REGULATORY MATERIAL
a. CAR Parts 511 and 513, Certification Procedures for Products and Parts.
b. CAR Part 525, Airworthiness standards: Transport category aircrafts.
c. CAR Standard 625 - Aircraft Equipment and Maintenance Standard
d. CAR Part 6, General Operating and Flight Rules.
e. CAR Part 7, Certification: Air Carriers and Commercial Operators.
f. CAR Part 702, 703, 704, 705, Operating Requirements: Domestic, Flag, and
Supplemental Operations.
g. CAR Part 604, Certification and Operations: Aircrafts Having a Seating Capacity
of 20 or More Passengers or a Maximum Payload Capacity of 6,000 pounds or More.
h. CAR Part 701, Operations: Foreign Air Carriers and Foreign Operators of U.S.-
Registered Aircraft Engaged in Common Carriage.
i. CAR Part 573, Approved Maintenance Organization
5. RELATED READING MATERIAL
a. Transport Canada Publications.
(1) TP 13850 Scheduled Maintenance Instruction Development Processes
(2) MSI–53, Supplemental Instructions for Continued Airworthiness
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
TP 14331 Enhanced Zonal Analysis Procedures 4
(3) MSI-42, Maintenance Schedule Amendment Instructions for the Inspection of
Thermal/Acoustic Insulation
b. US Federal Aviation Administration Publications
(1) AC 25-16 Electrical Fault and Fire Protection and Prevention
(2) AC 25.981-1B Fuel Tank Ignition Source Prevention Guidelines
(3) AC 43-12A Preventive Maintenance
(4) AC 43.13-1B Acceptable Methods, Techniques and Practices for
Repairs and Alterations to Aircraft
(5) AC 43-204 Visual Inspection For Aircraft
(6) AC 43-206 Avionics Cleaning and Corrosion Prevention/Control
(7) AC 65-15A Airframe & Powerplant Mechanics Airframe Handbook,
Chapter 11, Aircraft Electrical Systems
(8) AC 120-XX Program to Enhance Aircraft Electrical Wiring
Interconnection System Maintenance
(9) AC 120-YY Aircraft Wiring Systems Training Program
(10) AC 121-22 Maintenance Review Board (MRB) Procedures
c. EASA/JAA Publications.
(1) JAA Administration and Guidance Material (AGM)/Maintenance Procedure
Chapter 16
d. Reports.
(1) Transport Aircraft Intrusive Inspection Project, (An Analysis Of The Wire
Installations Of Six Decommissioned Aircraft), Final Report, The Intrusive
Inspection Working Group, December 29, 2000.
http://www.mitrecaasd.org/atsrac/intrusive_inspection.html
(2) FAA Aging Transport Non-Structural Systems Plan, July 1998.
http://www.faa.gov/apa/PUBLICAT/fatnspcov.htm
(3) National Transportation Safety Board, Safety Recommendation, September 19,
2000, A-00-105 through -108.
PROGRAM TO ENHANCE AIRCRAFT ELECTRICAL WIRING INTERCONNECTION SYSTEM MAINTENANCE
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