Pt. 91, App. B

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

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months after the date of the previous bench
check.
(4) A schedule that provides for the performance of a test and inspection of each
static pressure system in accordance with
appendix E to part 43 of this chapter within
12 calendar months after the date of the previous test and inspection.
(5) The procedures for the performance of
the periodic inspections and functional flight
checks to determine the ability of each listed instrument and item of equipment specified in section 2(a) of this appendix to perform as approved for Category II operations
including a procedure for recording functional flight checks.
(6) A procedure for assuring that the pilot
is informed of all defects in listed instruments and items of equipment.
(7) A procedure for assuring that the condition of each listed instrument and item of
equipment upon which maintenance is performed is at least equal to its Category II approval condition before it is returned to service for Category II operations.
(8) A procedure for an entry in the maintenance records required by Section 43.9 of this chapter that shows the date, airport, and reasons
for each discontinued Category II operation
because of a malfunction of a listed instrument or item of equipment.
(b) Bench check. A bench check required by
this section must comply with this paragraph.
(1) It must be performed by a certificated
repair station holding one of the following
ratings as appropriate to the equipment
checked:
(i) An instrument rating.
(ii) A radio rating.
(2) It must consist of removal of an instrument or item of equipment and performance
of the following:
(i) A visual inspection for cleanliness, impending failure, and the need for lubrication,
repair, or replacement of parts;
(ii) Correction of items found by that visual inspection; and
(iii) Calibration to at least the manufacturer-s specifications unless otherwise specified in the approved Category II manual for
the aircraft in which the instrument or item
of equipment is installed.
(c) Extensions. After the completion of one
maintenance cycle of 12 calendar months, a
request to extend the period for checks,
tests, and inspections is approved if it is
shown that the performance of particular
equipment justifies the requested extension.
[Doc. No. 18334, 54 FR 34325, Aug. 18, 1989, as
amended by Amdt. 91-269, 66 FR 41116, Aug. 6,
2001; Docket FAA-2018-0119, Amdt. 91-350, 83
FR 9172, Mar. 5, 2018]

APPENDIX B TO PART 91 - AUTHORIZATIONS TO EXCEED MACH 1 (Section 91.817)
Section 1. Application
(a) An applicant for an authorization to exceed Mach 1 must apply in a form and manner prescribed by the Administrator and
must comply with this appendix.
(b) In addition, each application for an authorization to exceed Mach 1 covered by section 2(a) of this appendix must contain all
information requested by the Administrator
necessary to assist him in determining
whether the designation of a particular test
area or issuance of a particular authorization is a  - major Federal action significantly
affecting the quality of the human environment -  within the meaning of the National
Environmental Policy Act of 1969 (42 U.S.C.
4321 et seq.), and to assist him in complying
with that act and with related Executive Orders, guidelines, and orders prior to such action.
(c) In addition, each application for an authorization to exceed Mach 1 covered by section 2(a) of this appendix must contain - 
(1) Information showing that operation at
a speed greater than Mach 1 is necessary to
accomplish one or more of the purposes specified in section 2(a) of this appendix, including a showing that the purpose of the test
cannot be safely or properly accomplished by
overocean testing;
(2) A description of the test area proposed
by the applicant, including an environmental
analysis of that area meeting the requirements of paragraph (b) of this section; and
(3) Conditions and limitations that will ensure that no measurable sonic boom overpressure will reach the surface outside of the
designated test area.
(d) An application is denied if the Administrator finds that such action is necessary to
protect or enhance the environment.
Section 2. Issuance
(a) For a flight in a designated test area,
an authorization to exceed Mach 1 may be
issued when the Administrator has taken the
environmental protective actions specified
in section 1(b) of this appendix and the applicant shows one or more of the following:
(1) The flight is necessary to show compliance with airworthiness requirements.
(2) The flight is necessary to determine the
sonic boom characteristics of the airplane or
to establish means of reducing or eliminating the effects of sonic boom.
(3) The flight is necessary to demonstrate
the conditions and limitations under which
speeds greater than a true flight Mach number of 1 will not cause a measurable sonic
boom overpressure to reach the surface.
(b) For a flight outside of a designated test
area, an authorization to exceed Mach 1 may

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