881 

Federal Aviation Administration, DOT 

§ 171.325 

(4) Posting of licenses and signs. 
(5) Relations 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 the station logs and other 

technical reports, and the submission 
of reports required by § 171.327. 

(10) Monitoring of the MLS facility. 
(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 issuing of NOTAM for rou-
tine or emergency shutdowns. 

(14) Commissioning of the MLS facil-

ity. 

(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 MLS fa-
cility that may require shutdown or re-
certification of the MLS facility by 
FAA flight check. 

(17) Procedures for conducting a 

ground check of the azimuth and ele-
vation alignment. 

(18) The following information con-

cerning the MLS 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 including required test 
equipment. 

(iii) The station power emission, 

channel, and frequency of the azimuth, 
elevation, DME, marker beacon, and 
associated compass locators, if any. 

(iv) The hours of operation. 

(v) Station identification call letters 

and method of station identification 
and the time spacing of the identifica-
tion. 

(vi) A description of the critical parts 

that may not be changed, adjusted, or 
repaired without an FAA flight check 
to confirm published operations. 

(d) The owner or his maintenance 

representative must make a ground 
check of the MLS facility periodically 
in accordance with procedures ap-
proved by the FAA at the time of com-
missioning, and must report the results 
of the checks as provided in § 171.327. 

(e) The only modifications permitted 

are those that are submitted to FAA 
for approval by the MLS equipment 
manufacturer. The owner or sponsor of 
the facility must incorporate these 
modifications in the MLS equipment. 
Associated changes must also be made 
to the operations and maintenance 
manual required in paragraph (c) of 
this section. This and all other correc-
tions and additions to this operations 
and maintenance manual must also be 
submitted to FAA for approval. 

(f) The owner or the owner’s mainte-

nance representative must participate 
in inspections made by the FAA. 

(g) The owner must ensure the avail-

ability of a sufficient stock of spare 
parts, including solid state compo-
nents, or modules to make possible the 
prompt replacement of components or 
modules that fail or deteriorate in 
service. 

(h) FAA approved test instruments 

must be used for maintenance of the 
MLS facility. 

(i) Inspection consists of an examina-

tion of the MLS equipment to ensure 
that unsafe operating conditions do not 
exist. 

(j) Monitoring of the MLS radiated 

signal must ensure a high degree of in-
tegrity and minimize the requirements 
for ground and flight inspection. The 
monitor must be checked daily during 
the in-service test evaluation period (96 
hour burn in) for calibration and sta-
bility. These tests and ground checks 
or azimuth, elevation, DME, and mark-
er beacon radiation characteristics 
must be conducted in accordance with 
the maintenance requirements of this 
section. 

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