Text in force at 27-51: from 27-11, effective 1 Feb 1977.
(a) Each landing gear wheel must have a tire--
(1) That is a proper fit on the rim of the wheel; and
(2) Of the proper rating.
(b) The maximum static load rating of each tire must equal or exceed the static ground reaction obtained at its wheel, assuming--
(1) The design maximum weight; and
(2) The most unfavorable center of gravity.
[(c) Each tire installed on a retrackable landing gear system must, at the maximum size of the tire type expected in service, have a clearance to surrounding structure and systems that is adequate to prevent contact between the tire and any part of the structure or systems.]
41 FR 55469 · Source