[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR125.125]

[Page 991]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
 PART 125_CERTIFICATION AND OPERATIONS: AIRPLANES HAVING A SEATING CAPACITY OF 
 
              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 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.