717 

Federal Aviation Administration, DOT 

§ 91.191 

(c) 

Authorized DA/DH. For the pur-

pose of this section, when the approach 
procedure being used provides for and 
requires the use of a DA/DH, the au-
thorized DA/DH is the highest of the 
following: 

(1) The DA/DH prescribed by the ap-

proach procedure. 

(2) The DA/DH prescribed for the 

pilot in command. 

(3) The DA/DH for which the aircraft 

is equipped. 

(d) Except as provided in § 91.176 of 

this part or unless otherwise author-
ized by the Administrator, no pilot op-
erating an aircraft in a Category II or 
Category III approach that provides 
and requires the use of a DA/DH may 
continue the approach below the au-
thorized decision height unless the fol-
lowing conditions are met: 

(1) The aircraft is in a position from 

which a descent to a landing on the in-
tended runway can be made at a nor-
mal rate of descent using normal ma-
neuvers, and where that descent rate 
will allow touchdown to occur within 
the touchdown zone of the runway of 
intended landing. 

(2) At least one of the following vis-

ual references for the intended runway 
is distinctly visible and identifiable to 
the pilot: 

(i) The approach light system, except 

that the pilot may not descend below 
100 feet above the touchdown zone ele-
vation using the approach lights as a 
reference unless the red terminating 
bars or the red side row bars are also 
distinctly visible and identifiable. 

(ii) The threshold. 
(iii) The threshold markings. 
(iv) The threshold lights. 
(v) The touchdown zone or touch-

down zone markings. 

(vi) The touchdown zone lights. 
(e) Except as provided in § 91.176 of 

this part or unless otherwise author-
ized by the Administrator, each pilot 
operating an aircraft shall imme-
diately execute an appropriate missed 
approach whenever, prior to touch-
down, the requirements of paragraph 
(d) of this section are not met. 

(f) No person operating an aircraft 

using a Category III approach without 
decision height may land that aircraft 
except in accordance with the provi-

sions of the letter of authorization 
issued by the Administrator. 

(g) Paragraphs (a) through (f) of this 

section do not apply to operations con-
ducted by certificate holders operating 
under part 121, 125, 129, or 135 of this 
chapter, or holders of management 
specifications issued in accordance 
with subpart K of this part. Holders of 
operations specifications or manage-
ment specifications may operate a civil 
aircraft in a Category II or Category 
III operation only in accordance with 
their operations specifications or man-
agement specifications, as applicable. 

[Doc. No. 18334, 54 FR 34294, Aug. 18, 1989, as 
amended by Amdt. 91–280, 68 FR 54560, Sept. 
17, 2003; Amdt. 91–296, 72 FR 31679, June 7, 
2007; Docket FAA–2013–0485, Amdt. 91–345, 81 
FR 90175, Dec. 13, 2016] 

§ 91.191

Category II and Category III 

manual. 

(a) Except as provided in paragraph 

(c) of this section, after August 4, 1997, 
no person may operate a U.S.-reg-
istered civil aircraft in a Category II or 
a Category III operation unless— 

(1) There is available in the aircraft a 

current and approved Category II or 
Category III manual, as appropriate, 
for that aircraft; 

(2) The operation is conducted in ac-

cordance with the procedures, instruc-
tions, and limitations in the appro-
priate manual; and 

(3) The instruments and equipment 

listed in the manual that are required 
for a particular Category II or Cat-
egory III operation have been inspected 
and maintained in accordance with the 
maintenance program contained in the 
manual. 

(b) Each operator must keep a cur-

rent copy of each approved manual at 
its principal base of operations and 
must make each manual available for 
inspection upon request by the Admin-
istrator. 

(c) This section does not apply to op-

erations conducted by a certificate 
holder operating under part 121 or part 
135 of this chapter or a holder of man-
agement specifications issued in ac-
cordance with subpart K of this part. 

[Doc. No. 26933, 61 FR 34560, July 2, 1996, as 
amended by Amdt. 91–280, 68 FR 54560, Sept. 
17, 2003] 

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