The primary Federal Aviation Administration (FAA )
regulations involved in landing overweight and fuel
jettison are:
■ Federal Aviation Regulation (FAR ) 25.1519 —
Requires the maximum landing weight to be an
operating limitation.
■ FAR 91.9 — Requires compliance with
operating limitations.
■ FAR 121.557 and FAR 121.559 — Allow the
pilot in command to deviate from prescribed
procedures as required in an emergency
situation in the interest of safety.
In June 1972,the FAA issued Air Carrier Operations Bulletin
No. 72-11 giving three examples of situations
the FAA considered typical of those under
which pilots may be expected to use their
emergency authority in electing to land
overweight:
■ Any malfunction that would render the
airplane unairworthy.
■ Any condition or combination, thereof,
mechanical or otherwise, in which an
expeditious landing would reduce the
exposure to the potential of additional
problems which would result in a
derogation or compromise of safety.
■ Serious illness of crew or passengers which
would require immediate medical attention.
http://www.boeing.com/commercial/aer...icle_03_1.html
In this scenario at best you may argue that avionic cooling may be compromised by prolonged flight but that would be tenuous at best.
You need to look for the least risk and that is not landing overweight in this case.