838 

14 CFR Ch. I (1–1–19 Edition) 

§ 171.273 

or immediately adjacent to controlled 
airspace, and where extensive delays 
are not a factor, the requirements of 
this paragraph may be reduced to reli-
able communications (at least a 
landline telephone) from the airport to 
the nearest Federal Aviation Adminis-
tration air traffic control or commu-
nications facility, if an adjacent Fed-
eral Aviation Administration facility 
can communicate with aircraft during 
the proposed instrument approach pro-
cedure, at least down to the minimum 
en route altitude for the controlled 
area. 

(f) Except where no operationally 

harmful interference will result, at lo-
cations where two separate ISMLS fa-
cilities serve opposite ends of a single 
runway, an interlock must ensure that 
only the facility serving the approach 
direction in use can radiate. 

[Doc. No. 14120, 40 FR 36110, Aug. 19, 1975, as 
amended by Amdt. 171–16, 56 FR 65665, Dec. 
17, 1991] 

§ 171.273

Maintenance and operations 

requirements. 

(a) The owner of the facility must es-

tablish an adequate maintenance sys-
tem and provide qualified maintenance 
personnel to maintain the facility at 
the level attained at the time it was 
commissioned. Each person who main-
tains a facility must meet at least the 
Federal Communications Commission’s 
licensing requirements and show that 
he has the special knowledge and skills 
needed to maintain the facility, includ-
ing proficiency in maintenance proce-
dures and the use of specialized test 
equipment. 

(b) In the event of out-of-tolerance 

conditions or malfunctions, as evi-
denced by receiving two successive 
pilot reports, the owner must close the 
facility be ceasing radiation, and issue 
a ‘‘Notice to Airman’’ (NOTAM) that 
the facility is out of service. 

(c) The owner must prepare, and ob-

tain approval of, an operations and 
maintenance manual that sets forth 
mandatory procedures for operations, 
periodic maintenance, and emergency 
maintenance, including instructions on 
each of the following: 

(1) Physical security of the facility. 
(2) Maintenance and operations by 

authorized persons. 

(3) FCC licensing requirements for 

operations and maintenance personnel. 

(4) Posting of licenses and signs. 
(5) Relation between the facility and 

FAA air traffic control facilities, with 
a description of the boundaries of con-
trolled airspace over or near the facil-
ity, instructions for relaying air traffic 
control instructions and information, 
if applicable, and instructions for the 
operation of an air traffic advisory 
service if the facility is located outside 
of controlled airspace. 

(6) Notice to the Administrator of 

any suspension of service. 

(7) Detailed and specific maintenance 

procedures and servicing guides stating 
the frequency of servicing. 

(8) Air-ground communications, if 

provided, expressly written or incor-
porating appropriate sections of FAA 
manuals by reference. 

(9) Keeping of station logs and other 

technical reports, and the submission 
of reports required by § 171.275. 

(10) Monitoring of the ISMLS facil-

ity. 

(11) Inspections by United States per-

sonnel. 

(12) Names, addresses, and telephone 

numbers of persons to be notified in an 
emergency. 

(13) Shutdowns for periodic mainte-

nance and issue of ‘‘Notices to Airmen’’ 
for routine or emergency shutdowns. 

(14) Commissioning of the ISMLS fa-

cility. 

(15) An acceptable procedure for 

amending or revising the manual. 

(16) An explanation of the kinds of 

activities (such as construction or 
grading) in the vicinity of the ISMLS 
facility that may require shutdown or 
recertification of the ISMLS facility 
by FAA flight check. 

(17) Procedures for conducting a 

ground check of the localizer course 
alignment, width, and clearance, glide 
path elevation angle and course width, 
and marker beacon power, and modula-
tion. 

(18) The following information con-

cerning the ISMLS facility: 

(i) Facility component locations with 

respect to airport layout, instrument 
runways, and similar areas. 

(ii) The type, make, and model of the 

basic radio equipment that provides 
the service. 

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