830 

14 CFR Ch. I (1–1–14 Edition) 

Pt. 91, App. B 

because of a malfunction of a listed instru-
ment or item of equipment. 

(b) 

Bench check. A bench check required by 

this section must comply with this para-
graph. 

(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 instru-

ment or item of equipment and performance 
of the following: 

(i) A visual inspection for cleanliness, im-

pending failure, and the need for lubrication, 
repair, or replacement of parts; 

(ii) Correction of items found by that vis-

ual inspection; and 

(iii) Calibration to at least the manufac-

turer’s specifications unless otherwise speci-
fied 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] 

A

PPENDIX

B 

TO

P

ART

91—A

UTHORIZA

-

TIONS

T

O

E

XCEED

M

ACH

1 (§ 91.817) 

Section 1. Application 

(a) An applicant for an authorization to ex-

ceed Mach 1 must apply in a form and man-
ner prescribed by the Administrator and 
must comply with this appendix. 

(b) In addition, each application for an au-

thorization to exceed Mach 1 covered by sec-
tion 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 authoriza-
tion is a ‘‘major Federal action significantly 
affecting the quality of the human environ-
ment’’ 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 Or-
ders, guidelines, and orders prior to such ac-
tion. 

(c) In addition, each application for an au-

thorization to exceed Mach 1 covered by sec-
tion 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 spec-
ified in section 2(a) of this appendix, includ-
ing 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 require-
ments of paragraph (b) of this section; and 

(3) Conditions and limitations that will en-

sure that no measurable sonic boom over-
pressure will reach the surface outside of the 
designated test area. 

(d) An application is denied if the Adminis-

trator 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 appli-
cant shows one or more of the following: 

(1) The flight is necessary to show compli-

ance with airworthiness requirements. 

(2) The flight is necessary to determine the 

sonic boom characteristics of the airplane or 
to establish means of reducing or elimi-
nating 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 num-
ber 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 
be issued if the applicant shows conserv-
atively under paragraph (a)(3) of this section 
that— 

(1) The flight will not cause a measurable 

sonic boom overpressure to reach the surface 
when the aircraft is operated under condi-
tions and limitations demonstrated under 
paragraph (a)(3) of this section; and 

(2) Those conditions and limitations rep-

resent all foreseeable operating conditions. 

Section 3. Duration 

(a) An authorization to exceed Mach 1 is ef-

fective until it expires or is surrendered, or 
until it is suspended or terminated by the 
Administrator. Such an authorization may 
be amended or suspended by the Adminis-
trator at any time if the Administrator finds 
that such action is necessary to protect the 
environment. Within 30 days of notification 
of amendnent, the holder of the authoriza-
tion must request reconsideration or the 
amendnent becomes final. Within 30 days of 
notification of suspension, the holder of the 
authorization must request reconsideration 
or the authorization is automatically termi-
nated. If reconsideration is requested within 
the 30-day period, the amendment or suspen-
sion continues until the holder shows why 
the authorization should not be amended or 

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