There is no "special rule or exemption" for experimental aircraft when it
comes to airworthiness under Part 91.
You may petition the FAA for an MEL but that applies to the aircraft in
question, not all Lancairs. I would doubt an inspector would permit an MEL
to be written that would allow this flight under these circumstances. You could
obtain a one time special flight permit from the FAA to "ferry" the
aircraft to a place where repairs would be made-- but you must operate the
aircraft within the limits of the ferry permit.
See the below regulations. If you have any questions-- fire away.
Section 91.213: Inoperative instruments and equipment.
(a) Except as provided in paragraph (d) of this section, no person may take
off an aircraft with inoperative instruments or equipment installed unless the
following conditions are met:
(d) Except for operations conducted in accordance with paragraph (a) or (c)
of this section, a person may takeoff an aircraft in operations conducted under
this part with inoperative instruments and equipment without an approved Minimum
Equipment List provided—
(1) The flight operation is conducted in a—
(i) Rotorcraft, non-turbine-powered airplane, glider, lighter-than-air
aircraft, powered parachute, or weight-shift-control aircraft, for which a
master minimum equipment list has not been developed; or
(ii) Small rotorcraft, nonturbine-powered small airplane, glider, or
lighter-than-air aircraft for which a Master Minimum Equipment List has been
developed; and
(2) The inoperative instruments and equipment are not—
(i) Part of the VFR-day type certification instruments and equipment
prescribed in the applicable airworthiness regulations under which the aircraft
was type certificated;
(ii) Indicated as required on the aircraft's equipment list, or on the Kinds
of Operations Equipment List for the kind of flight operation being conducted;
(iii) Required by §91.205
or any other rule of this part for the specific kind of flight operation being
conducted; or
(iv) Required to be operational by an airworthiness directive; and
(3) The inoperative instruments and equipment are—
(i) Removed from the aircraft, the cockpit control placarded, and the
maintenance recorded in accordance with §43.9
of this chapter; or
(ii) Deactivated and placarded “Inoperative.” If deactivation of the
inoperative instrument or equipment involves maintenance, it must be
accomplished and recorded in accordance with part 43
of this chapter; and
(4) A determination is made by a pilot, who is certificated and appropriately
rated under part 61
of this chapter, or by a person, who is certificated and appropriately rated to
perform maintenance on the aircraft, that the inoperative instrument or
equipment does not constitute a hazard to the aircraft.
An aircraft with inoperative instruments or equipment as provided in
paragraph (d) of this section is considered to be in a properly altered
condition acceptable to the Administrator.
(e) Notwithstanding any other provision of this section, an aircraft with
inoperable instruments or equipment may be operated under a special flight
permit issued in accordance with §§21.197
and 21.199
of this chapter.