Airlines should ensure that the power connections are tight and sealed
properly to help prevent arcing. Typical information on maintenance
procedures can be found in the AMM or SRM.
bulletins and letters.
Each airline should review all applicable Boeing-, Douglas-, and
supplier-issued service bulletins, service letters, and similar
advisories to evaluate the potential effects of windshield-related
issues on its fleet. For example, Boeing service bulletin 737-56-1010
(Sept. 2, 1999) recommends replacement of windshields on certain
models if they do not pass a dielectric leak check. Replacement
helps prevent electrical arcing and reduces system schedule interruptions.
removal and repair.
Once an airline has removed a windshield from service, the windshield
can be scrapped; repaired as directed in the applicable OHM or CMM;
or returned to Boeing, the supplier, or the repair station for repair.
Boeing-recommended overhaul procedures are published in the OHM
or CMM for the appropriate windows. In general, these procedures
describe disassembly of the window frame and any attached mechanism
but do not address disassembly of the window transparency itself.
In most cases, the 707,
727, and 737 windshields are structurally and functionally interchangeable.
This is important when an airline is managing a fleet with various
airplane models. Other Boeing- and Douglas-designed airplane windshields
also are interchangeable within models and sometimes across families.
The AIPC can be consulted to help determine interchangeability for
each applicable model.
Repair stations are approved by the U.S. Federal Aviation Administration
or other appropriate regulatory agency. Stations include Boeing,
Boeing-approved suppliers, and original window manufacturers.
Airlines are encouraged to use supplier-provided training aids,
which include color illustrations that help in the identification
of damage requiring window removal. Airlines also should consider
training select maintenance personnel in flight deck windshield
repair and sending them to industry-related conferences to promote
better understanding of windshields.