839 

Federal Aviation Administration, DOT 

§ 171.275 

(iii) The station power emission and 

frequencies of the ISMLS localizer, 
glide path, beacon markers, and associ-
ated 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 ISMLS facility periodi-
cally 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 § 171.275. 

(e) Modifications to an ISMLS facil-

ity may be made only after approval by 
the FAA of the proposed modification 
submitted by the owner. 

(f) The owner or the owner’s mainte-

nance representative must participate 
in inspections made by the FAA. 

(g) Whenever it is required by the 

FAA, the owner must incorporate im-
provements in ISMLS maintenance. 

(h) The owner or his maintenance 

representative must provide a suffi-
cient stock of spare parts, including 
solid state components, or modules to 
make possible the prompt replacement 
of components or modules that fail or 
deteriorate in service. 

(i) FAA approved test instruments 

must be used for maintenance of the 
ISMLS facility. 

(j) The mean corrective maintenance 

time of the ISMLS equipment may not 
exceed 0.5 hours, with a maximum cor-
rective maintenance time of not great-
er than 1.5 hours. This measure applies 
to failures of the monitor, transmitter 
and associated antenna assemblies, 
limited to unscheduled outage and out- 
of-tolerance conditions. 

(k) The mean time between failures 

of the ISMLS equipment may not be 
less than 1,500 hours. This measure ap-
plies to unscheduled outages, out-of- 
tolerance conditions, and failures of 
the monitor, transmitter, and associ-
ated antenna assemblies. 

(l) Inspection consists of an examina-

tion of the ISMLS equipment to ensure 

that unsafe operating conditions do not 
exist. 

(m) Monitoring of the ISMLS radi-

ated signal must ensure a high degree 
of integrity and minimize the require-
ments for ground and flight inspection. 
The monitor must be checked periodi-
cally during the in-service test evalua-
tion period for calibration and sta-
bility. These tests and ground checks 
of glide slope, localizer, and marker 
beacon radiation characteristics must 
be conducted in accordance with the 
maintenance requirements of this sec-
tion. 

§ 171.275

Reports. 

The owner of the ISMLS facility or 

his maintenance representative must 
make the following reports at the indi-
cated time to the appropriate FAA Re-
gional Office where the facility is lo-
cated. 

(a) 

Facility Equipment Performance and 

Adjustment Data 

(

FAA Form 198

). The 

FAA Form 198 shall be filled out by the 
owner or his maintenance representa-
tive with the equipment adjustments 
and meter readings as of the time of fa-
cility commissioning. One copy must 
be kept in the permanent records of the 
facility and two copies must be sent to 
the appropriate FAA Regional Office. 
The owner or his maintenance rep-
resentative must revise the FAA Form 
198 data after any major repair, mod-
ernization, or retuning to reflect an ac-
curate record of facility operation and 
adjustment. In the event the data are 
revised, the owner or his maintenance 
representative shall notify the appro-
priate FAA Regional Office of such re-
visions, and forward copies of the revi-
sions to the appropriate FAA Regional 
Office. 

(b) 

Facility Maintenance Log 

(

FAA 

Form 6030

–

1

). FAA Form 6030–1 is a per-

manent record of all the activities re-
quired to maintain the ISMLS facility. 
The entries must include all malfunc-
tions met in maintaining the facility 
including information on the kind of 
work and adjustments made, equip-
ment failures, causes (if determined) 
and corrective action taken. In addi-
tion, the entries must include comple-
tion of periodic maintenance required 
to maintain the facility. The owner or 
his maintenance representative must 

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