Federal Aviation Administration, DOT

Section 171.253

(i) Location by latitude and longitude to the nearest second, and its
position with respect to airport layouts.
(ii) The type, make, and model of the
basic radio equipment that will provide
the service.
(iii) The station power emission and
frequency.
(iv) The hours of operation.
(v) Station identification call letters
and methods of station identification,
whether by Morse Code or recorded
voice announcement, and the time
spacing of the identification.
(c) If the owner desires to modify the
facility, he shall submit the proposal
to the Federal Aviation Administration and meet applicable requirements
of the Federal Communications Commission, and must not allow any modification to be made without specific
approval by the Federal Aviation Administration.
(d) The owner-s maintenance personnel shall participate in initial inspections made by the Federal Aviation Administration. In the case of subsequent inspections, the owner or his
representative shall participate.
(e) The owner shall provide a stock of
spare parts, of such a quantity to make
possible the prompt replacement of
components that fail or deteriorate in
service.
(f) The owner shall shut down the facility by ceasing radiation, and shall
issue a  - Notice to Airmen -  that the facility is out of service (except that private use facilities may omit  - Notices
to Airmen - ) upon receiving two successive pilot reports of its malfunctioning.
Section 171.213 Reports.
The owner of each facility to which
this subpart applies shall make the following reports, at the times indicated,
to the Federal Aviation Administration Regional Office for the area in
which the facility is located:
(a) Record of meter readings and adjustments (Form FAA-198). To be filled
out by the owner or his maintenance
representative with the equipment adjustments and meter readings as of the
time of commissioning, with one copy
to be kept in the permanent records of
the facility and two copies to the appropriate Regional Office of the Fed-

eral Aviation Administration. The
owner must revise the form after any
major repair, modification, or retuning, to reflect an accurate record of
facility operation and adjustment.
(b) Facility maintenance log (FAA
Form 6030-1). This form is a permanent
record of all equipment malfunctioning
met in maintaining the facility, including information on the kind of
work and adjustments made, equipment failures, causes (if determined),
and corrective action taken. The owner
shall keep the original of each report
at the facility and send a copy to the
appropriate Regional Office of the Federal Aviation Administration at the
end of the month in which it is prepared.
(c) Radio equipment operation record
(Form FAA-418), containing a complete
record of meter readings, recorded on
each scheduled visit to the facility.
The owner shall keep the original of
each month-s record at the facility and
send a copy of it to the appropriate Regional Office of the Federal Aviation
Administration.
[Doc. No. 10116, 35 FR 12716, Aug. 11, 1970, as
amended by Amdt. 171-10, 40 FR 36110, Aug.
19, 1975]

Subpart
I - Interim
Standard
Microwave Landing System
(ISMLS)
SOURCE: Docket No. 14120, 40 FR 36110, Aug.
19, 1975, unless otherwise noted.

Section 171.251 Scope.
This subpart sets forth minimum requirements for the approval and operation of non-Federal Interim Standard
Microwave Landing System (ISMLS)
facilities that are to be involved in the
approval of instrument flight rules and
air traffic control procedures related to
those facilities.
Section 171.253 Definitions.
As used in this subpart:
Angular displacement sensitivity (Glide
Slope) means the ratio of measured
DDM to the corresponding angular displacement from the appropriate reference line.
Collocated ground station means the
type of ground station which transmits

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