[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR125.125]

[Page 580-581]
 
                     TITLE 14--AERONAUTICSAND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 125--CERTIFICATION AND OPERATIONS: AIRPLANES HAVING A SEATING 
CAPACITY OF 20 OR MORE PASSENGERS OR A MAXIMUM PAYLOAD CAPACITY OF 6,000
 POUNDS OR MORE; AND 
RULES GOVERNING PERSONS ON BOARD SUCH AIRCRAFT--Table of Contents
 
              Subpart E--Special Airworthiness Requirements
 
Sec. 125.125  Pressure cross-feed arrangements.

    (a) Pressure cross-feed lines may not pass through parts of the 
airplane used for carrying persons or cargo unless there is a means to 
allow crewmembers to shut off the supply of fuel to these lines or the 
lines are enclosed in a fuel

[[Page 581]]

and fume-proof enclosure that is ventilated and drained to the exterior 
of the airplane. However, such an enclosure need not be used if those 
lines incorporate no fittings on or within the personnel or cargo areas 
and are suitably routed or protected to prevent accidental damage.
    (b) Lines that can be isolated from the rest of the fuel system by 
valves at each end must incorporate provisions for relieving excessive 
pressures that may result from exposure of the isolated line to high 
temperatures.