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Section 91.177

14 CFR Ch. I (1-1-19 Edition)

(x) A person conducting an EFVS operation during an authorized Category
II or Category III operation must conduct the operation in accordance with
operations specifications, management
specifications, or a letter of authorization authorizing EFVS operations during authorized Category II or Category
III operations.
(3) Visibility and Visual Reference Requirements. No pilot operating under
this section or Section 121.651, Section 125.381, or
Section 135.225 of this chapter may continue
an approach below the authorized MDA
or continue an approach below the authorized DA/DH and land unless:
(i) The pilot determines that the enhanced flight visibility observed by use
of an EFVS is not less than the visibility prescribed in the instrument approach procedure being used.
(ii) From the authorized MDA or DA/
DH to 100 feet above the touchdown
zone elevation of the runway of intended landing, any approach light system or both the runway threshold and
the touchdown zone are distinctly visible and identifiable to the pilot using
an EFVS.
(A) The pilot must identify the runway threshold using at least one of the
following visual references-
(1) The beginning of the runway landing surface;
(2) The threshold lights; or
(3) The runway end identifier lights.
(B) The pilot must identify the
touchdown zone using at least one of
the following visual references - 
(1) The runway touchdown zone landing surface;
(2) The touchdown zone lights;
(3) The touchdown zone markings; or
(4) The runway lights.
(iii) At 100 feet above the touchdown
zone elevation of the runway of intended landing and below that altitude,
the flight visibility must be sufficient
for one of the following visual references to be distinctly visible and
identifiable to the pilot without reliance on the EFVS - 
(A) The runway threshold;
(B) The lights or markings of the
threshold;
(C) The runway touchdown zone landing surface; or
(D) The lights or markings of the
touchdown zone.

(4) Compliance Date. Beginning on
March 13, 2018, a person conducting an
EFVS operation to 100 feet above the
touchdown zone elevation must comply
with the requirements of paragraph (b)
of this section.
(c) Public aircraft certification and
training requirements. A public aircraft
operator, other than the U.S. military,
may conduct an EFVS operation under
paragraph (a) or (b) of this section only
if:
(1) The aircraft meets all of the civil
certification and airworthiness requirements of paragraph (a)(1) or (b)(1)
of this section, as applicable to the
EFVS operation to be conducted; and
(2) The pilot flightcrew member, or
any other person who manipulates the
controls of an aircraft during an EFVS
operation, meets the training, recent
flight experience and refresher training
requirements of Section 61.66 of this chapter
applicable to EFVS operations.
(d) Exception for Experimental Aircraft.
The requirement to use an EFVS that
meets the applicable airworthiness requirements specified in paragraphs
(a)(1)(i),
(a)(2)(iii),
(b)(1)(i),
and
(b)(2)(iii) of this section does not apply
to operations conducted in an aircraft
issued an experimental certificate
under Section 21.191 of this chapter for the
purpose of research and development or
showing compliance with regulations,
provided the Administrator has determined that the operations can be conducted safely in accordance with operating limitations issued for that purpose.
[Docket FAA-2013-0485, Amdt. 91-345, 81 FR
90172, Dec. 13, 2016; 82 FR 2193, Jan. 9, 2017]

Section 91.177 Minimum altitudes for IFR operations.
(a) Operation of aircraft at minimum altitudes. Except when necessary for
takeoff or landing, or unless otherwise
authorized by the FAA, no person may
operate an aircraft under IFR below - 
(1) The applicable minimum altitudes
prescribed in parts 95 and 97 of this
chapter. However, if both a MEA and a
MOCA are prescribed for a particular
route or route segment, a person may
operate an aircraft below the MEA
down to, but not below, the MOCA, provided the applicable navigation signals
are available. For aircraft using VOR

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